Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Aida’s Orthodontic Flash Cards > Clinical Cases > Flashcards

Clinical Cases Flashcards

1
Q

Kindelan et al., 2008

A

Traumatized teeth may also be at risk of undergoing more apical root resorption during treatment.
The nature and timing of the traumatic injury has a bearing on further treatment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Arias and Marquez-Orozco, 2006

A

use of NSAIDs, including aspirin and ibuprofen, for pain control may retard tooth movement Nevertheless, as their analgesic properties are proven, they continue to have application in orthodontic pain control.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

3rd most disliked feature of an unesthetic smile?

A

Black triangles, Cunliffe 2009

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which is better VFR or Hawley retainer?

A

Outhaisavanah, 2020
VFR is better than Hawley

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The ideal range of maximum insertion torque for TADs

A

McManus 2011

The ideal range of maximum insertion torque 5- 15 Ncm.
Effect of miniscrew placement torque on resistance to miniscrew movement under load.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Relationship between
vertical skeletal pattern and success rate of orthodontic mini-implants. Due to relatively thin maxillary cortical plate, increased MMPA patients have higher failure rate

A

Moon et Al 2010

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Classification of maxillary tooth transpositions

A

Sheldon & Lina Peck 1995

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

international congress of anatomists and physical anthropologists was held in Frankfort, Germany, in 1882,

A

Frankfort plan

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

)mean rate of space closure of 0.81 mm per month with NiTi coils versus 0.58 mm with elastomeric chain and 0.35 with active elastomeric ligatures.

A

Dixon et al. (2002

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

reported no benefit associated with forces in excess of 150 g during space closure.

A

Samuels et al. (1998)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

0.019 × 0.025-in. stainless steel wire has approx. 8 degrees of geometric play in a 0.022 × 0.028-in. slot

1) the inability to fill the slot because of the size difference of archwires and bracket slot,
(2) irregularities from the manufacturing process of brackets precluding proper engagement, (3) differences in the stiffness of wire alloys engaged to the bracket slot,
(4) variations between actual and reported bracket torque values.
(5) ligation modes, all of which might account for increased third-order clearance or bracket-archwire “play.”

A

Gioka and Eliades 2004)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Clinical research has shown relatively little impact of bracket dimensions either on treatment duration, quality of result or potential side effects of treatment

A

Yassir et al. 2018; El-Angbawi et al. 2018).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Stainless steel springs close buccal segment spaces as rapidly as NiTi coil springs.
(0.58 mm per 4weeks for NiTi / 0.85 mm per 4 weeks for SS)

A

Norman et Al 2016

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Canine travels a distance of 21.99mm in the3-dimensions between the age of 5-15 years

A

Coulter and Richardson, 1997.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

prevalence of
tooth-size disproportion of this order in an orthodontic population is around 24% in the mandibular arch and 28% in the maxillary arch

2mm of tooth size arch length discrepancy is clinically significant

A

(Othman and Harradine, 2007).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

1- Lateral incisor root resorption by impacted 3 in normal radiographs, prevalence of 12.5%.
2- Conventional CT scanning 48%.
3- cone beam CT scanning 67%.
4- cone beam CT scanning 74%.

A

1-(Ericson and Kurol, 1988b).
2- (Ericson and Kurol, 2000a, b).
3- (Walker et al., 2005).
4- Alemam et Al., 2020.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

*71% were developmental in origin,
*22% resulted from trauma to the deciduous predecessor
*7% were associated with cysts or supernumerary teeth

A

(Stewart, 1978).etiology of dilaceration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

If canine not palpable at 9-10 y then investigate

A

Mittal 2017

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Maxillary lateral incisor hypodontia : factors favoring space closure Vs space opening

A

Savario & McIntyre 2005
Silveria & Mucha 2016

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Proclination is an effective means of reducing overbite with each five degrees of proclination leading to overbite decrease of the order of 1 mm

A

Eberhart et al. 1990

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Andrews 1972, 6 keys to the ideal occlusion based on analysis of 120 non-orthodontic normal occlusion

A

– Class I molar relationship
– Correct crown angulation
– Correct crown inclination
– Absence of spacing
– Absence of rotations
-Flat or gentle occlusal curve

7th key- absence of Bolton discrepancy—-MBT

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Incremental vs one time correction of increased OJ for modified twin block therapy

A

Banks 2004

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

TB is a more effective functional appliance than Dynamax in overjet reduction and many adverse effects from Dynamax

A

Thiruvenkatachari 2010

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Dynamax made by

A

Nivelle Bass 2003

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

With An overjet more than 9mm up to 45% sustained dental injury
Less than 9mm 23% sustained dental injury
Female sex predilection

A

Todd & Dodd 1985

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Risk factors for gingival recession

A

1-thin gingival bio type
2-presence of recession prior to ttt
3-gingival inflammation
4-poor OH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Which circumstances lower incisor proclination is stable?

A

1- after correction of class II/2(Mills1973)
2-after surgical correction of class III(Artun 1990)
3-after thumb sucking habit cessation
4-pre-existing lip trap

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Contraindications of fixed appliance after functional appliance therapy

A

1- poor OH
2-poor compliance
3- mixed dentition
4-well aligned dental arches with no lateral open bites

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Causes of late incisors crowding

A

1.tooth size & shape
2.mandibular 3rd molars
3. physiologic mesial drift of teeth
4.lack of interproximal wear
5.Occlusal forces
6.soft tissue changes
7.late mandibular growth. (decrease of inter canine width due to )
8.mandibular growth rotations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Mechanics for firing space without TADs

A

1-Class III elastics
2-adding torque to the incisors
3- post segment can be protracted individually tooth by tooth
4- archwire rounded and reduced in dimension to reduce friction locally
5- light forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Bracket prescription after functional appliance

A

According to Fleming 2007 MBT
Choose a bracket prescription with increased :
-labial root torque in the lower labial segment
-palatal root torque in upper labial segment
-buccal root torque in maxillary molars if maxillary expansion took place to counteract unwanted buccal flaring .

To counteract excessive Dentoalveolar changes during the functional phase.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

How to prevent relapse after functional phase? TRANSITIONAL l phase

A

1- overcorrection
2- deep and steep anterior bite plane
3-night time wear with occlusal trimming to allow lat open bite closure
4-continue functional phase during permanent dentition
5-headgear during early phase of fixed appliance
6-use of early class II elastics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

of all the statistically significant differences we found, only 5 were deemed to be clinically significant by our definition:
1-ideal smile arc
2-ideal buccal corridor
3-maximum gingival display
4-upper to lower midline
5-cant.

A

Springer et Al 2011

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

The most significant features of an ideal smile by order of importance?

A

According to Springer et al 2011:
1- smile arc
2-buccal corridors
3-gingival display
4- upper & lower centerlines
5- cant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Ballista loop

A

Jacoby 1979

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

0.05%= 230 ppm= 500 microgram NaF [daily mouthwash]
0.2%= 900 ppm NaF [ weekly mouthwash]
1.1%= 5000 ppm= 5 mg NaF [high Fl toothpaste]
0.619%= 2800 ppm= 2.8 mg NaF [ medium high toothpaste]
5%= 22600 ppm= 22.6mg NaF [duraphat fluoride varnish]

A

Fluoride

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

VBA

A

VBA is a very brief advice from dental professional to a pt smoker not on Medical need basis

[The best way to stop smoking is with a combination of behavioural support and stop smoking aids, which can significantly increase the chance of stopping.]

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Genes involved in CLP

A

IRF6
MSX1
FGF (fibroblast growth factor)
BMP4 (bone morphogenic protein)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Adult orthodontics differs from adolescent?

A

1-Medical status
2-psychological status(body dysmorphic syndrome )
3-previous orthodontic treatment (OIIRR)
4-lack of growth
5-TMD
6-Restored dentition
7-Periodontal condition
8-Treatment mechanics
9-motivation
10-esthetic demand
11-impacted canine
12-Retention

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

CAT, material,mm?

A

Aligners are generally made from poly-vinyl siloxane (PVS)48 and should be worn full- time, except when eating, and replaced every two weeks, with the aim of moving the teeth by 0.25 mm with each align

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

CVM

A

Lamparski 1972
Hassel & Farman 1991
Baccetti et Al 2005
Baccetti et Al 2008

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

CVM staging differences
McNamara & Baccetti2016, user guide

A

the shape of C3 and C4 vertebral bodies change in form from trapezoidal to rectangular horizontal to square to rectangular vertical.

C3 and C4: trapezoidal in CS1 to CS3.
C3 and C4: rectangular horizontal in CS 4.
C3 and C4: square in CS 5.
C3 and C4: rectangular vertical in CS 6.

CS 1 and CS 2 prepubertal.
CS 3 and CS 4 circumpubertal
CS 5 and CS 6 postpubertal.

CS1–ideal time to intervene with facial mask therapy combined with rapid maxillary expansion (RME) is at CS 1. Maximum skeletal adaptations.
CS2– “get-ready” stage because the peak interval of mandibular growth should begin within a year after this stage.
CS3– maximum craniofacial growth velocity is anticipated.
CS4–continued accelerated craniofacial growth can be anticipated.
CS5– most substantial craniofacial growth has been achieved.
CS6– a patient can be evaluated for corrective jaw surgery or the placement of endosseous implants in the esthetic region. (most difficult stage to determine)

gold standard for determining the (continuation or cessation) is the evaluation of two lateral headfilms taken 6–12 months apart

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Types of growth spurts

A

3types
1-neonatal(1-2y)
2-juvenile(6-8y)
3-adolescent (M12-14-F10-12)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

Growth prediction methods [enumerate]

A

1-peak height velocity curve / growth chart.
2-simple questioning
3-CVM.
4- secondary sexual characteristics
5- scammon’s growth curve
6-dental developmental age
7-chronological age.
8-hand wrist R/G.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

Lip growth

A

Upper lip female:20-22 mm
Upper lip male:22-24mm (males grow more than females)

Growth plateau at 18y males
At 14 y females

Lower lip growth plateau in both sexes at 16y

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

Age of decline of growth to adult levels?

A

Dimension. Female. Male.

Transverse. 12 years (maxilla). 12 years (maxilla)
intercanine width 9 years (mandible). 9 years (mandible)
Anteroposterior 2-3 years after first menstruation. 4 years after sexual maturity
14-15 years (maxilla) 17 years (maxilla)
16-17 years (mandible) 19 years(mandible)
Vertical. 17-18 years Early 20s

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

What measure should we take to ensure successful class II/2 Treatment?

A

1-lower incisors bite anterior to upper incisor root centroid
2-composite build-up of upper incisor cingulae
3-proper torque of U&L incisors
4-increase the interincisal angle
5-retention U&L bonded retainers
6-Begg retainer(wrap around)with anterior flat bite plane.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

A consonant Smile arc 1st
Average buccal corridors 2nd most important feature for à beautiful smile

A

Moore et Al 2005

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Sizes and materials of bonded fixed retainers?

A

Metal bonded retainer. Esthetic bonded retainer

1-Round. SS. Multistrand. 0.0175”. 1-polyethylene woven ribbon. 1mm
2-Round. SS. Multistrand. 0.0195”. 2-fiber reinforced composite resin 0.75mm
3-Round. SS. Multistrand. 0.9mm. 3-glass fiber reinforced
4-Round. SS. Coaxial. 0.0215” 4-silanised glass fibers. 0,5mm
5-Flat. Ti. Tri flex. 5-
6-Round. SS. Dead softTwisted0.0009”
8-
9-

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

Hierarchy of stability

A

*Vertical change: {AOB}——->Worst prognosis
• Transverse change: ———>Poor prognosis
• Alignment: irregularity and spacing ———Moderate prognosis
• Vertical change: deep overbite ———>Moderate prognosis
• Antero-posterior change: ———>Best prognosis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

Lower arch expansion and lower incisors proclination are inherently unstable

A

Ackerman & Proffit 1997

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

No difference between Niti vs multistrand SS in alignment time ,pain,effectiveness

A

Want et Al 2010

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

1-Four-premolar extraction or nonextraction treatment protocols seem to have no
predictable effect on overall smile esthetics, meaning that if well indicated, extraction in
orthodontics does not necessarily have a deleterious effect on facial esthetics.
2-a small dental midline deviation of 2.2 mm can be acceptable by both orthodontists and laypeople
3- an axial midline angulation of 10’ (2 mm measured From the midline papilla and the incisal edges of the incisors) is already very apparent,
4- studies dealing with real smiles, buccal corridor sizes and smile arc alone do not seem To affect smile attractiveness.

A

Janson 2011 [systematic review]

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

Systematic review of mandibular changes induced by functional appliances are larger if treatment coincides with the pubertal peak in skeletal maturation.

A

Cozza et Al,2006

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

Deep and steep bite plane dimensions

A

A bite plane at least 8 mm deep and at an inclination of 70 degrees to the horizontal is recommended.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

Bacteria in caries and periodontitis

A

Caries: streptococus mutants/ lactobacili
Periodontitis: porphyromonas gingivalis/ actinobacillus actinomycetemcomitans(juvenile periodontitis)/prevotela intermedia/ fusobacterium.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

Classification of WSL

A

Gorelick , 1982
Score 0: no WSL
Score 1: slight
Score2: severe
Score3: cavitated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

WSL,Treatment?

A

1-OH improvement/removal of wire/education
2-topical fluoride
3-bleaching
4-CPP-ACP(casein phosphopeptide amorphous calcium phosphate)tooth mousse
5-resin infiltration
6-microabrasion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

Braun S. 1996 the curve of Spee revisited.

A

depth of 9mm needs only 2mm space

The arch circumference reduction is considerably less than that found by earlier investigators, implying that the incisor protrusion often associated with leveling the curve of Spee is not primarily due to the aforementioned differential, but rather more directly due to the mechanics used in leveling the curve of Spee.

60
Q

Othman & Harradine 2007

A

1- 17%of population has more than 2 standard deviation from Bolton analysis.(24%mand-28%max) prevalence of tooth-size disproportion of this order in an orthodontic population
2- up to +-2mm correction is clinically significant.
3- visual method for crowding assessment has low sensitivity and specificity.

61
Q

Who said?
1-3rd molars do not affect anterior crowding relapse?
2-Preventive removal of 3rd molar to reduce late incisors crowding can’t be endorsed

A

1- Cotrin et al 2020.
2- Harradine 1998.

62
Q

Surgical indicators for class II correction according to Proffit?

A

1- 10mm or more OJ
2- total facial height more than 125mm.
3- pogonion behind nation perpendicular more than 18mm
4- small mandibular body less than 70mm (Go-Pog)

63
Q

Upper & lower limits for incisal mov.to compensate for classIII: 120 upper (to S-N)80 lower(md plane)

A

Burns et al 2010

64
Q

Overall failure rate of mini screws

A

Alharbi et al 2018 says rev/ meta analysis(Almuzian,D.Bearn)

Overall failure rate of mini screws is 13.5% (11% maxilla- 16.5% mandibule)
Diameter, length, design, pt age and jaw of insertion had minimal effect.
Risk factors:non-keratinized mucosa and smocking had statistically significant effect

65
Q

Mod quality evidence
NiTi coil spring faster space closure(0.2mm/month) than Elastomeric power chain

A

Mohammed & Almuzian 2017

66
Q

No evidence that active Ortho ttt prevent or relieve TMD.

A

Luther et al 2010 Cochrane sys rev

67
Q

RBB survival rate

A

*Cantilever all-ceramic RBFPDs gave a better outcome than metal-ceramic cantilever RBFPDs for the replacement of missing anteriors. (No prep or minimal prep)
*Zirconia-ceramic RBFDPs yielded a 10-year survival rate of 98.2% and a success rate of 92.0%.
*[Phosphate monomer containing resin cement and zirconia.]
*Survival of Cantilever RBB better than fixed fixed RBB. Due to limitation of movement between different abutment teeth.
*Increase bond strength by modifying tooth prep:
-proximal grooves/path of insertion/cingulum rest/ labial wrap

68
Q

Effectiveness of early Ortho ttt with TB app.

A

O’Brien, et al 2009 RCT AJODO.
10 year multi center RCT.
No difference bet. Early[8-9] or late[adolescent 12.5y]
With respect to skeletal pattern, self esteem or extraction pattern.

69
Q

Class III protraction face mask

A

Mandall et al (2010, 2012 & 2016)
15month ttt, 70% of pt had +ve OJ(4.4mm) and ANB (2.6)
Patients maintained dental outcomes at 3years & 6 years follow up( 70%-68%)
All skeletal effects lost.
Need for surgery reduced (only 1/3 of pt who had pFM ttt still needed surgery)

70
Q

Conventional vs Active or passive self ligation brackets
Single step etch+ primer vs conventional etch /primer

A

Fleming et al 2013
No difference in alignment, inclination changes.

Fleming 2010
Decreased working time but higher failure rate

71
Q

Success rate of maxillary canine auto transplantation

A

Patel et al 2011
Survival rate 83% average duration 14.5 y for grossly malpositioned with little scope for Ortho alignment

72
Q

Part time vs full time wear of VFR retainers

A

Thickett & power 2010
No difference

73
Q

Fluoride application during Ortho ttt

A

Benson et al 2018 Cochrane sys rev
Application of Fluoride varnish every 6 weeks effective in reducing WSL by 70%

74
Q

Prevalence of hypodontia

A

Khalaf et al 2014.
Overall prevalence 6.4%( highest in Africans followed by Europeans)
Most common affected: mandibular 2nd premolars/maxillary lateral incisor and 2nd premolar.

75
Q

Early ttt of prominent upper front teeth Klaus Batista et Al 2018 Cochrane review

A

Low to mod evidence that early ttt for children with prominent upper front teeth is more effective in reducing incidence of incisal trauma. [By 12% because 31% of late ttt group already had incisal trauma while only 19% of early ttt group had incisal trauma so the reduction of 12% in incidence of incisal trauma to prominent upper incisors].

76
Q

Methods to prevent lingual rolling of a s during space closure after 6s extraction

A

1-alignment on rectangular NiTi wires
2- full sized SS rectangular wire for space closure
3-widening the wire posteriorly
4-lingual root torque in wire
5-class II elastics from lingual cleats
6-MBT prescription -10
7-light controlled forces
8-double forces( buccal & lingual)

77
Q

Extra oral and cephalometric methods of telling which component is the malocclusion?

A

E.O.:
1-Virtual ttt objectives.(ant positioning of md, cotton roll in labial sulcus)
2-masking the face.
3-Signs of maxillary deficiency.
4- zero meridian line.
5- NLA

Ceph:
1- Nasion perpendicular
2- SNA- SNB and not ANB.
3- Harvold unit length.

78
Q

Canine protected occlusion is better than group function occlusion, why?

A

1- canine has better canine/root ratio.
2- canine has more root surface area, better proprioception during lateral excursion.
3- canine root shape is concave, better directed to tolerate occlusal forces.
Doc#10

79
Q

Mandibular rotation

A

Apparent rotation: -7
Actual rotation: -15
Angular remodeling in the mandible masks the actual rotation by 50%.

Low angle= negative growth rotation = anti clockwise rotation

80
Q

Causes of deep bite

A

1-skeletal: Class II skeletal base [div1 & div 2].
2-dental: poorly defined cingulum, absent occlusal step.
3- soft tissue: lip trap
4- habits: thumb sucking

81
Q

How to minimize lower incisors proclination?

A

1- bypass incisors during bonding
2- MBT prescription
3- swapping canine brackets
4- labial root torque
5- cinch back
6- class III elastics
7-power chain (with extraction cases)
8- IPR

Reverse COS
Slot 18
Using full size rectangular archwire
Torquing auxiliaries

82
Q

Prognosis of stability

A

Cl II div2: Increase interincisal angle & lower incisal edge occluding 2mm anterior to upper central root centroid.
Cl II Div 1: upper incisors should be under the control of the lower lip.

83
Q

Sys rev on different movements causing OIIRR

A

Weltman et al 2010

84
Q

Headgear accidents percentages

A

6% of HG patients are injured.
40% of them extra oral injuries
60% of them intraoral injuries
20% of them midfacial injuries

85
Q

Maxillary lateral incisors and mandibular second premolars were the most commonly missing teeth. A trend away from space opening and prosthetic replacement toward orthodontic space closure was observed from 2000 to 2017/2018. This may reflect a change in attitude toward prosthetic replacement options and/or greater optimism with biomechanical strategies since the implementation of temporary anchorage devices to assist in space closure.

A

Steven Naoum et al 2021
Fleming quoted his paper in Angle orthodontics.

86
Q

Hypodontia classification/ prevalence

A

Mild: 1-2/moderate:3-5/ severe: 6 or more {Al-Ani2017}
4-4.5% in UK

87
Q

Genes of hypodontia

A

MSX1/ PAX9/ AXIN2/ EDA/ FGF3/ WNT10A/ BMP4.
OVER 300 DIFFERENT GENES
PAX9 —> lateral incisor
MSX1–> all second premolars and mandibular central incisor
AXIN2–> lower incisor
EDA—>severe hypodontia

88
Q

Indication for Hawley and Begg retainers

A

Occlusal settling
Maintenance of transverse expansion
Temporary tooth replacement

Begg retainer for mesial space closure and occlusal settling

89
Q

OIIRR, classification, prevelance, causes?

A

Weltman et Al 2010 —>90% of orthodontic cases undergo OIIRR

Levander& Malmgren Index (1988) of OIIRR:

0 —>no root resorption
1 —>blunting of root tip
2 —>less than 2mm (majority)
3 —>more than 2mm & less than 1/3 root length (15%)
4 —> more than 1/3 root length (<5%) According to Becker 2005 not much harm

Causes:
1-#Pt related factors:
Age/gender/ethnicity(low in Asians)/habits(nail biting-wind inst)/med history(asthma)/genetics.
2-#Tooth related:
Abnormal morphology/ taurodontism/roots in contact with cortical bone/teeth with no occlusal contact/trauma hx.
3-#Ttt related:
Heavy/ continuous/intrusive forces/Amount of tooth movement/ duration of treatment.
Tipping movement/ class II elastics.

90
Q

Hierarchy of stability

A

Worst prognosis—>AOB
Poor prognosis —>transverse
Moderate prognosis—>deep bite/alignment/spacing
Good prognosis —>AP

91
Q

How do you align an impacted canine?

A

1- TPA with SS auxiliary (palatal)
2-TPA with TMA fishing rod( buccally directed)
3-URA(twin bloc+ monkey hooks)
4-Magnets(bulky)
5-TADs(in opposing arch)
6-ballista loop(14ss)
7-piggy back(14Niti)
8-elastomeric chain
9-SS archwire auxiliary(simple &effective)

92
Q

Signs of vertical maxillary excess

A

1-increased lower anterior facial height
2-increased incisal show at rest
3- increased gingival show at smile
4-incompetent lips

93
Q

Factors affecting incisor display

A

1-type of smile
2- lip elevation(7Mm)
3- lip length
4-vertical dental display (10.5mm)
5-vertical maxillary display
6-age: decrease with age
7-sex:female 3.5mm/male 2mm
8-incisor inclination

94
Q

Supracrestal fibrotomy

A

Pericision, Edwards 1988
*Def:Surgical procedure involving sectioning supracrestal fibers.
*How:holding scalpel no.12 vertically in gingival sulcus and severing the fibers
*Never done to a mid labial surface of a tooth with narrow gingiva or thin alveolar bony support.
*Alternative: divide interdental papilla

95
Q

Classification of skeletal class II

A

Steiner
Mild:4-7
Moderate:7-9
Severe:>9

96
Q

When to tell if pt is orthognathic surgery case or not?

A

skeletal discrepancy& A-B points [ANB= -4 / >9]
*vertical proportions: low or average
*Cheif complaint (if pt comlpains from profile)
*age /growth potential.
*achieve edge-to-edge/ displacement
*degree of dental compensation
*soft tissue mask sk. Discrepancy [NLA- E-line]
*space conditions & occlusal parameters

97
Q

How to measure lip length

A

1- average : 19-22mm.Philtrum height
2-linear: from subnasale to intercommissure line.
3-Ratio: 1/3 of LAFH.

98
Q

NLA, how to tell which component is responsible

A

NLA is divided by the FMP into upper NLA & lower NLA.
U NLA= 25•
L NLA= 85•

99
Q

Deep bite stability in ttt goals

A

1-decrease interincisal angle
2-lower incisor edges bite 2 mm anterior to upper incisor root centroid.
3-proper torquing of U&L incisors.
4- composite build up to upper incisor cingulae.
5-fixed retention
6-Begg retainer( wrap around) with flat anterior bite plane.

100
Q

Non carious tooth surface loss

A

Basic erosive wear examination [BEWE]
Knight & Smith index for tooth surface loss

101
Q

Theories of tooth movement

A

Osteoblast—>RANKL & Osteoprotegerin.
RANKL binds to RANK receptor on pre-osteoclast—>osteoclast.
—>Osteoprotegerin binds to RANKL—> stops it’s activity—>apoptosis of osteoclast
—>removes osteoid by matrix metalloproteinase.
Osteoclast resort bone.

1-Pressure -tension theory( Oppenheim)
*force—>pressure side—>resorption/tension side—> deposition
*if force greater and exceeds capillary pressure—>hyalinization(glass like appearance) & undermining resorption: slow to mov/pain/discomfort.

2-bone bending and bio-electric signaling
*bone surface bends & become convex and concave-tension.
*electrical & streaming potentials produced by bone deflection

3- cell Shape change/ signal transduction/secondary messengers
*cell shape mechanical deformation —>activation of integrins—>secondary messengers
* secondary messengers:cyclic AMP/ phosphoinositide

4-signaling molecules:
*Arachidonic acid metabolites: Prostaglandins & leukotrienes—>increase to mov.
*Neurotransmitters & cytokines: pain—>nerve release neurotransmitters—>leukocytes migration—>cytokines—>prostaglandins/growth factors—>bone remodeling.

5-Alteration in cellular function(gene expression) & remodeling
*stretching of periodontal ligament cells—>up regulation of genes &differentiation into osteoblastic like activity.

102
Q

Crossbite correction

A

1-URA+ exoantion screw
2-Quadhelix( slow fixed palatal expander)
3-HYRAX( fast fixed palatal expander) RME
4-Cross elastics
5-Active TPA.
6-Active TPA with extended arms(on premolars)
7- Expanded heavy Auxiliary archwire (in buccal tubes of molars lighted anteriorly to wire bet.incisors)
8- Miniscrew assisted rapid maxillary expansion. MARPE

103
Q

Initial stability of tads

A

Initial stability can’t be guaranteed/high failure rate in mandible/ dense bone overheating/narrow band of attached gingiva

104
Q

Sizes ànd sites of tads

A

Buccal alveolus maxilla:8-10mm length/1.5mm width/ short neck
Palatal alveolus: 8-10mm length/1.5mm width/ long neck
Mandibular alveolus: 8-10mm length”oblique”6mm “perpendicular”/1.5mm width/ short neck
Infrazygomatic: 12mm length/2mm width/ long neck

105
Q

Risks for canine alignment

A

1-root resorption of neighboring teeth
2-
3-pulp obliteration and discoloration
4-ankylosis 1ry or 2ry
5-decalcification
6-generalized root resorption
7-failure of Treatment
8-Crestal bone loss

106
Q

Types of occlusal plane

A

1-anatomical occlusal plane: molar cusp to incisal edges/Mx-Md
2-functional occlusal plane: from molar cusps to premolars.
3-geometric occlusal plane: line bisecting MMPA.
4-bisected OP

107
Q

Correction of anterior Crossbite

A

1- 2x4F.A
2- Raymond’s method: upper palatal buttons/lower labial brackets & elastics
3- URA with expansion screw or Z-spring
4-Catalan’s appliance: fixed anterior bite plane

108
Q

MIH definition/ classification/management

A

Def: hypomineralization of sys origin affecting 1-4 molars &/or incisors.
Prevalence:≈13%
types: hypoplasia/hypomineralised.
etiology:
-prenatal:maternal illness.
-perinatal: low birth weight.
-postnatal:fever/ response tract problems.
mgmt:
-GIC/Xtn ideal time/Ortho ttt to close space/onlays restorations.
Problems: difficult to anesthetize/pain/sensitivity/Caries/poor prog.

109
Q

Prop of ideal index

A

1-valid
2-reliable &reproducible
3-simple & cheap
4-accepted by professionals &population.
5-require minimal judgment.
6-sensitive
7-specific

110
Q

How to assess soft tissue

A

Static & dynamic.

Static:
1-lip competence
2-lip thickness (14-15mm)
3-lip length
4- NLA
5-MLA

Dynamic:
1-smile arc
2- smile line
3- gingival show & gingival esthetics.
4-buccal corridors

111
Q

Inter arch relation ships

A

1-Incisal
2-OJ
3-OB
4-XB
5-CL
6-Canine
7-Molar

112
Q

What are the cenmentation steps/ materials?

A

1-clean tooth surface/ dry
2-isolation/ mix prep
3-apply cement to internal surface of the band covering all surfaces esp from gingival direction.
4-insertion using hand pressure then using bite stick & band pusher.
5- until band is flush with the marginal ridge
6- remove excess and wait for setting advice pt to avoid hard food for 24hrs

Types:GIC/ RMCIC(Optiband)/compomer/zinc phosphate cement
Light cured/chemically cured

113
Q

Theoretical / actual slop?

A

According to Gioka & Eliades 2004
9.6• & 14•

114
Q

Best wire for single canine retraction

A

20 SS for low asperities and round configuration

115
Q

When to use MBT prescription

A

1- after twinblock—> regain torque in U & L
2- class II/2—> better stability
3- class III—> more torqued U & L incisors
4- Extraction of poorly prognostic 6s—> less lingual rolling

116
Q

How to tell pt has acceptable OH to begin Ortho ttt?

A

According to British periodontal society, less than 10% on gingival index & less than 20% on plaque index

117
Q

Effective radiation dose? Yearly and daily background radiation in UK

A

According to Isacsson 2015

Bite wing/periapical: 0.0003 msv—>1hr background radiation

Pano: 0.0027 msv—> 8hrs background Radiation

Ceph: 0.0022 msv—> 8hrs background radiation

Occlusal: 0.008 msv—> 1day background radiation

Yearly background radiation—>2.7msv
Daily background radiation—>0.0075msv

118
Q

Indications of small field of vision [FOV] CBCT Isacsson 2015

A

1- unerupted maxillary canine(if not diagnosed by 2 p.a. Or 1p.a. And a pano)
2-unerupted dilacerated maxillary central(dilaceration management)
3-surgical planning of removal of supernumerary.
4- cleft palate assessment: graphing and ectopic teeth localization.

119
Q

Indications of upper occlusal film Isacsson 2015

A

1-parallax localization (with pano or with p.a.)
2-confirm presence of unerupted teeth
3- identify supernumerary
4- identify developmental anomalies

120
Q

Risk of cancer from radiography

A

Pano: 1 in a 1.000.000
P.a.: 1 in a 10.000.000
Ceph: 1 in a 5.000.000

121
Q

Curve of Spee

A

An imaginary line in the sagital plane drawn between mandibular 1st molars and incisors
Measured by the depth of deepest point from a flat p,and connecting incisor tips and last standing molar

122
Q

Andrews six keys of normal occlusion

A
  1. Molar relationship:
    *The mesio-buccal cusp of the upper first permanent molar lies in the groove between the mesial and middle cusps of the lower first permanent molar.
    *The distal surface of the disto-buccal cusp of the upper first permanent molar makes contact and occludes with the mesial surface of the mesio-buccal cusp of the lower second molar.
    *Functional cusps of lower 1st perm molar occludes in central fossa of upper 1st perm molar.
    *cusps lie in embrasures.
  2. Crown angulation or mesio-distal tip:
    The gingival portion of the long axis of each crown is distal to the incisal portion.
  3. Crown inclination:
    Labio-lingual or bucco-lingual inclination. The upper and lower anterior crown inclination is sufficient to resist over-eruption of the anterior teeth and to allow proper distal positioning of the contact points of the upper teeth in relation to the lower teeth, permitting proper occlusion of the posterior crowns. A lingual crown inclination exists in the upper posterior crowns, is constant and similar from canines through to the second premolars, and slightly more pronounced in the molars. For the lower posterior teeth, the lingual crown inclination progressively increases from canines through to second molars.
  4. Rotations: There are no rotations.
  5. Spaces: There are no spaces, contact points aretight.
  6. Occlusal plane: The plane of occlusion is either flat or there is a slight curve of Spee.
123
Q

What is a lateral ceph?

A

It’s true lateral view of facial bones, base of the skull , upper cervical spine and the soft tissues.
It’s standardized from the X-ray source and the film with known magnification so it can be used for superimposition and comparison.

124
Q

Positional factors affecting the surgical management of impacted permanent mandibular canines

O

A

According to Bolooki 2022:

1-Canine angulation: 0°–15° —>exposure/>45°—>Extraction
2-Canine root position(horizontal):. Expected canine position. —>Exposure/Mesial of expected position—>Extraction
3-Canine crown height(vertical): 1/2 root length-CEJ—> exposure/>root length—>extraction
4-Overlap of adjacent tooth: No overlap < ½ root—>exposure /> Midline—>extraction

Labiolingual position had no effect upon the management decision.

125
Q

Björk & Skieller 1983
Stable structures of anterior cranial base

A

1-anterior wall of sella turcica.
2-ant clinoid process {Walker point}
3-cribriform plate of ethmoid.
4-ethmoid crest.
5-orbital roof of frontal bone(cerebral surface)

126
Q

Long term prognosis of retained 2nd 1ry molar without successor

A

Bjerklin & Bennet 2000/ Sletten 2003/ dosantos 2022
If the 2nd 1ry molar survived till the 20s most probably will have long term survival
1ry canines last till 4th decade

127
Q

Crossbite correction sys rev

A

According to Ugolini 2021:
1-children early mixed dentition(7-11): quad helix more effective , shorter duration for posterior Crossbite ttt.
2- For adolescents perm dentition(7-16):HYRAX & Haas have similar effect in correction &increasing inter molar width

128
Q

Factors affecting lip competency

A

1- Age
2- lip length
3- LAFH
4-AP mandibulaire position
5- incisors position

129
Q

Factors affecting amount of incisor display during rest and smile

A

1-Age
2-Sex
3-Vertical maxillary excess
4-vertical dental display
5-incisor inclination
6-type of smile
7-lip elevation
8-lip length

130
Q

Advantages of delta clasp over adams cribs

A

1- excellent retention
2-adaptable to most post teeth
3- doesn’t need frequent adjustments
4- less breakages
5- keeps its shape and doesn’t loose it with frequent wear of appliance

131
Q

NEw R/G rating & ALARP Principle

A

Diagnostically acceptable (95%)
Diagnostically unacceptable (5%)

“As low as reasonably practicable “
Increase efficiency:
Rectangular collimating/ intensifying screen/aluminum filter/ voltage 60-70kv/fast films(F)/short exposure time.
Done by Public Health England & faculty of general dental practice 2020

132
Q

Theoretical to actual play

A

According to Dalstra et 2015:
Actual play = 2.4 x theoretical play
Passive Self ligating brackets have least torque control but with conventional brackets the ligature hold the wire at the back of the slot—>expressing torque

133
Q

Activation of coil spring & push coil

A

NiTi coil spring—> 1/3-1/2 in addition to its original length
StSt coil spring—>1/3-1/2 in addition to its original length
NiTi push coil—> up to twice inter bracket distance
StSt push coil—> inter bracket distance + a bracket width

134
Q

Bacteria around bands

A

More causing periodontitis than caries
Actinomyces & streptococcus mutants

135
Q

Bands vs tubes failure rate

A

According to Millet 2011 Cochrane sys rev.
Bonded tubes have higher failure rate than bands and more decalcification

136
Q

Adhesive remnant index [ ARI]

A

By Arnut & Bergland 1984

0 all adhesive on bracket
1 less than 50% of mesh exposed
2 more than 50% of mesh exposed
3 all remnants on tooth surface

137
Q

Percentage of hypodontia

A

M3m —>30%
2nd premolars—>3%
Mx lateral—>2%
Mn central—>less than 1%
Mx3–>0.03%

138
Q

How to manage Bolton discrepancies

A

1-Accept
2-IPR
3-Composite restoration
4-tilting the tooth
5-extraction

139
Q

Failure rate of bonded retainers

A

30% in the lower arch (Al-Moghrabi et al, 2016)
50% in the upper arch (Katherine et al, 2017).
The failure rate is higher in the upper arch due to occlusion.
This failure rate increases as the upper retainer extends beyond U2s.
due to L3s cusp tip contact with retainer between U2 and U3.

140
Q

Growth theories

A

The exact mechanism of facial growth control is not fully understood.
Currently the functional matrix theory is supported.
Some genetic control lies within the cranial base synchondrosis and the nasal septal cartilage.

141
Q

Growth theories enumerate

A

1- cartilaginous
2- remodeling
3- sutural growth theory
4- functional matrix theory
5-servosystem theory
6-part-counterpart theory

142
Q

MIH

A

Qualitative enamel defects of systemic origin affecting one or more molars w/out incisors

143
Q

GENE RESPONSIBLE FOR VERTICAL MANDIBULAR GROWTH

A

AMELX- Amelogenin- amelogenesis imperfecta

144
Q

Difference between double teeth and macrodont

A

A macrodont has:
No-notching
More than 2 SD in size
Same number of teeth

145
Q

Mechanics for closure of large midline diastema

A

1-using full size SS archwire
2-swapping the brackets
3-V-bend in middle of archwire
4-closure on long crimpable hooks

146
Q

TMJ management

A

1-patient assurance and education(30% relieved by reassurance)
2- explaining relationship of TMD and stress
3- resolve pain by conservative approach
4- modify ttt by using light forces
5- suspend ttt and refer to specialist

Aida’s Orthodontic Flash Cards (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions