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Dentures Flashcards

1
Q

Neurocentric

A

Position: closest to the tongue as possible
Proportion: reduce Occlusal table by 40%
Pitch: parallel between ridges
Form: non-anatomic
Number: reduce posterior teeth from 8 to 6

Devan

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2
Q

Neil’s Lateral Throat form

A

Class I: 8-12mm of extension below the mylohyoid ridge (long, wide flange)
Class II: 4-6mm of extension below the mylohyoid ridge
Class III: 2-3mm of extension below the mylohyoid ridge; RARE

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3
Q

Kelly Combination syndrome

A

Papillary Hyperplasia
Max ant ridge resorption
Extrusion of mand ant teeth
Downgrowth of tuburosities
Resorption of mand post ridge

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4
Q

House palatal throat form

A

Class I: 5-12 mm post from hard palate
Class II: 3-5 mm post to hard palate
Class III: anterior to hard palate

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5
Q

The area in the mouth where the force of the tongue pushing out is neutralized by the forces of the cheeks and lips pressing inward so that normal muscle activity retains dentures rather than dislodges them.

A

Neutral Zone

Berersin Scheiser

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6
Q

Dentogentics

A

Frush and Fisher

Sex
Age
Personality

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7
Q

Balancing ramps

A

Nepola and Sears

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8
Q

PDI for edentulism

A

1) residual bone height
2) residual bone morphology
3) muscle attachments
4) maxillo-mandibular relationship

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9
Q

Pear shaped pad

A

Cradock

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10
Q

-6 factors of retention

A

adhesion: the physical attraction of unlike molecules
​-cohesion: the physical attraction between like molecules
​-interfacial surface tension: resistance to separation by the film of liquid between
the denture base and the supporting tissues (combines cohesion and adhesion).
​-mechanical locking into undercuts
​-peripheral seal and atmospheric pressure: *the most important factor
​-orofacial musculature: correct position of denture teeth must be in the neutral zone

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11
Q

The quality of a prosthesis to resist displacement by functional horizontal or rotational stress. THIS IS THE MOST IMPT FACTOR. Occlusion that is not balanced in excursive movements will create instability of the denture, loss of retention and eventually frustration to the patient.

A

Stability

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12
Q

The quality inherent in the prosthesis that resists dislodgement along the path of insertion

A

Retention

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13
Q

6 purposes of posterior palatal seal

A

​1. retention of max denture
​2. firm contact with the palatal tissue reduces the gag reflex
3. it reduces food accumulation
​4. the pressure on the tissue makes the distal border of the denture less noticeable to the dorsum of the tongue.
​5. it compensates for dimensional change
6. the thickened area provides added strength across the denture

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14
Q

the arbitrary terminal hinge axis: measured out from the posterior margin of the tragus of the ear – 13mm on a line between the tragus of the ear and the outer canthus of the eye.

A

Beyrons point

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15
Q

Hanau’s formula

A

L = H/8 + 12
​-H is the horizontal condylar inclination established by the protrusive record
​-L is the lateral condylar inclination

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16
Q

Theilman’s formula

A

K(balance) = IG x CG / CH x OP x CC

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17
Q

Foundation area on which a dental prosthesis rests

A

Denture support

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18
Q

5 ways to improve denture support

A

​1. surgical removal of pendulous tissue
​2. use of tissue conditioning materials
​3. surgical reduction of sharp/bony ridges
4. surgical enlargement of ridge
5. implants

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19
Q

6 advantages of a anatomic teeth

A

​-1. Can establish mechanical and physiologic occlusion.
​-2. Penetrates food more easily.
​-3. Articulate in harmony with TMJ and masticatory muscles.
​-4. Resists rotation of denture base through interdigitation with cusps.
​-5. Better esthetics.
​-6. Less trauma to underlying tissues.

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20
Q

What is Frenum composed of?

A

Non keratinized, unattached alveolar mucosa with an underlying fibrous attachment to bone. 35% of max frenum have small striated muscle; Gartner, 1991

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21
Q

Muscles of Mastication

A

●Temporalis
Origin: lateral surface of the skull (temporal fossa)
Insertion: Coronoid process, anterior border of ramus
Action: elevates mandible, posterior part retrudes jaw
●Masseter
Origin: zygomatic arch (process)
Insertion: lateral surface of ramus, coronoid process
Action: elevates mandible
●Medial Pterygoid
Origin: medial surface of lat pterygoid plate, pyramidal process of palatine and tuberosity
Insertion: medial surface of ramus
Action: elevated mandible
●Lateral Pterygoid:
Origin: lateral surface of lateral pterygoid plate
Insertion: neck of condyle and Disc and capsule of TMJ
Action: depresses, protrudes, moves mandible side to side

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22
Q

What is in retromolar pad?

A

•glandular tissue
•loose areolar tissue
•pterygomandibular raphe
Superior pharyngeal constrictor
Buccinator
•Tendon of the Temporalis
•Most impt: cortical bone underlying these structures

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23
Q

How long leave denture out?

A

48-72 hours

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24
Q

How to balance monoplane setup

A

Balancing ramp

Nepola and Sears

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25
Q

PDI Classification for edentulism

A

1) residual bone height
2) residual none morphology
3) muscle attachments
4) maxillo-mandibular relationship

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26
Q

How to mark PPS

A

Empirical method; visually marked the vibrating line (ah technique) with Thompson indicator stick which transfer mark to record base. Adjusted the record base to this line and transferred to master cast

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27
Q

Landmarks for setting teeth and occusal plane

A

Esthetics; parallel to the inter-pupilary line and ala tragus line
Neutral zone impression: Fish; Beresin, Scheiser; ant corresponds to the modiolus Mandibular first molar is 2/3 way up the retro-molar pad

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28
Q

What are some reasons for porosity in processing?

A

If rate of reaction is too high you will get porosity; heat slow

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29
Q

What is Passavants pad

A

A prominence on the posterior wall of the naso-pharynx formed by contraction of the superior constrictor of the pharynx during swallowing.

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30
Q

Wax Classification

A

Baseplate: Type I, soft; Type II, medium; Type III hard (75% Parafin)
Casting: Type I direct(medium hard), Type II indirect(soft)
Modeling plastic: Type I stick, Type II cake

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31
Q

What is compound wax

A

“modeling plastic”
Low thermal conductivity: it requires time for cooling to prevent distortion ADA Spec #3: Type I, stick; Type II, cake

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32
Q

Compound specifications

A

Flow at 98.6 F is >6%
Thermal Contraction is .3%
Softening temperature:
Green, 123F
Red, 132F

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33
Q

Green stick compound makeup

A

Rosin
Copal resin
Carnauba(filler)
Talc
Rouge(color)
Stearic Acid(fat

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34
Q

Ways to evaluation vertical dimension

A

Physiologic rest
Phonetics
Pre-treatment records
Closing forces
Ceph
Esthetics
Tactile
Swallowing
Wear

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35
Q

Closest speaking space clearance

A

Class I: 2-3mm
Class II: 3-6mm
Class III: 1mm

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36
Q

Frankfort horizontal plane

A

Lowest point on orbit to Highest point on external auditory meatus

Porion to orbitale

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37
Q

Why use blue mousse

A

Initially dead soft
Fast set
Sets rigid
Dimensionally stable
Unaffected y disinfectants
Can be trimmed

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38
Q

What are the four methods of obtaining CR

A

1) Static Recordings; Direct interocclusal records
2) Graphic recordings; started with Balkwill but Gysi first to record mandibular movement and
CR, pantograph, coble balancer (Hardy and Pleasure)
3) Functional Records: myomonitor, swallowing with compound cones, stereograph (TMJ-
articulator- Swanson and Swif); chew-in Myers
4) Cephlometrics- Atwood

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39
Q

What are 4 ways of guiding patient?

A

1) swallowing (.4mm error); Shannahan (static)
2) chin point guidance (.14 error); Gnathology (static)
3) chin point w/ ant jig (.07 error); Lucia (static)
4) bimanual manipulation (.05 error); Dawson (static

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40
Q

Define CR

A

A maxillomandibualr relationship in which the condyles articulate with the thinnest avascualr portion of the disc with the complex in an anterior superior relationship against the articular eminance

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41
Q

What bacteria are in caries

A

Strep mutans (8 serotypes): found in everyone; probably responsible for onset
Lactobacilli: probably responsible for progression of cavitated lesions
Strep has ability to adhere to tooth structure, and form sticky matrix

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42
Q

Fluoride level

A

Optimal in water 1ppm
>10 cause fluorosis

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43
Q

Saliva quantity

A

1000-1500 ml/day

Parotid - 26% - serous
Submandibular - 69%- mixed
Sublingual & palatine - 5% - mucous

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44
Q

Facial forms for denture teeth

A

Williams classification

Square
Tapering
Ovoid

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45
Q

Dentogenics

A

Frush & Fisher

Sex
Personality
Age

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46
Q

Muscles of masseteric notch

A

Buccinator and masseter

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47
Q

How to treat Candida Albicans

A

Nystatin rinse 5ml qid 10 days

Ketoconazole 200-400mg daily 1-4 weeks

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48
Q

Treatment for patients with xerostomia

A

Sialogogue therapy

Pilocaprine 5mg qid

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49
Q

Acrylic powder

A

Polymer-PMMA
Initiator - benzoyl Peroxide (decomposes after 60 degrees Celsius)
Pigments - mercuric sulfide, ferric oxide, carbon black
Dyes - leach out by oral fluids
Opacifiers - zinc or titanium oxide
Plasticizers - dibutyl phthalate

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50
Q

Acrylic liquid

A

Monomer - MMA

Inhibitor - hydroquinone; prevents premature polymerization
Accelerator - tertiary amine; dimethyl-para-toludine; used in auto polymerization to initiate peroxide decomposition
Plasticizer - dibutyl phthalate- creates plasticity
Cross linking - glycol dimethacylate - resists cracking and crazing

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51
Q

Steps of acrylic

A

Initiation: formation of free radicals; heat/amine +peroxide = free radicals
Propagation: free radical + monomer = growing polymer chain
Termination: hydroquinone + free radical = polymer chain

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52
Q

What is triad

A

Urethane dimethacrylate

initiated by light (400-500 nm) and camphoriquinone

3% shrinkage

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53
Q

What are high impact resins reinforced with?

A

Butadiene styrene rubber

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54
Q

Initial PMMA shrinkage

A

Volumetric 21%
Linear 7%

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55
Q

Pre-polymerized shrinkage

A

Volumetric 6%
Linear .5%

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56
Q

Types of Shrinkage

A

1) thermal- due to different CTE of stone and resin

2) polymerization Shrinkage- due to covalent bonds which occupy less vol than unbound mole.

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57
Q

Dentate vs. edentulous bite force

A

Dentate 200psi

Edentulous 50psi

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58
Q

Earl Pound concept for maxillary central incisor

A

The central incisor length = the face length / 16

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59
Q

the angle formed between the saggital plane and the average path of the advancing non-working side as viewed in the horizontal plane during lateral mandibular movements.

A

Bennett Angle

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60
Q

Fisher’s angle

A

The angle formed by the intersection of the protrusive and non-working side condylar paths as viewed in the saggital plane when recording of mandibular movement is made by using a device located lateral to the TMJ.

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61
Q

a plane that passes through the inferior border of the mandible.

A

Mandiblar plane

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62
Q

The space that occurs between opposing posterior teeth during mandibular protrusion.

A

Christensen phenomenon

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63
Q

Decrease percent of complete edentulism by 2050

A

2.6%

Decrease in edentulism but increase in population

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64
Q

3 Indications for pre-prosthetic tori removal

A

A torus that extends beyond the posterior palatal seal area
A torus with overlying traumatized tissue/mucosa
A torus that interferes with function (speech and deglutition)

Contra-indication- tori fills more than half the palate

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65
Q

Advatanges of lingualized occlusion

A

Reduces lateral forces on the denture bearing tissues
Vertical forces are centered upon the mandibular residual ridges
This scheme yields cross-arch, but not cross-tooth, balance

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66
Q

During protrusion of the mandible, what are the actions of the superior and inferior heads of the lateral pterygoid muscles?

A

Superior head relaxes
Inferior head contracts

67
Q

What is the primary function of the superior head of the lateral pterygoid muscle?

A

Positioning the articular disk during closure.

68
Q

Types of Osteoporosis

A

Type I: primary—makes up the vast majority of cases—post-menoposal –loss of estrogen resulting in increased bone turnover, with predominant loss of travecular bone
Type II secondary—senile osteoporosis—gradual age-related bone loss found in both sexes caused by systemic senescense—induced by loss of stem-cell precursors, with predominant loss of cortical bone
Type III Osteogenesis Imperfecta—due to genetic mutation, affecting 6/100,000 people (eight known types of OI)
Type IV Idiopathic juvenile osteoporosis—no known cause, and usually has onset just before puberty

69
Q

What are the types of oropharyngeal candidiasis

A

Acute pseudomembranous candidiasis
Acute atrophic candidiasis
Chronic atrophic candidiasis
Chronic hyperplastic candidiasis
Angular chelitis
Median rhomboid glossitis

70
Q

Sleep hypopnea index

A

STOP BANG

Mild: 5-15 events/hour
Moderate: 15-30 events per hour
Severe: > 30 events/hour

Tongue size
Male
Neck circumference

71
Q

Tallgren average bone loss over 25 years

A

Maxilla .05 per year

Mandible .2 per year

72
Q

Average thickness of periosteum

A

.375mm

73
Q

TNM classification

A

T=primary tumor size
N=node size
M=presence of metastatic sites

74
Q

What does face bow record?

A

records the spatial relationship of the maxillary arch to the hinge axis

75
Q

What etiologic factors are associated with denture stomatitis

A

Poor denture hygiene
Continual and nighttime wearing of dentures
Accumulation of denture microbiota
Ill-fitting dentures

76
Q

Which oral microbes are responsible for denture stomatitis

A

Candida albicans
Candida tropicalis
Candida glabrata
Candida pseudotropicalis
Candida guillierimondii
Candida krusei

77
Q

What are the effective doses of radiation for the following dental radiograph

A

Cephalogram = 10 uSv
Panoramic = 14.2-24.3 uSv
Full-mouth series = 13 – 100 uSv
CBCT = 19-1073 uSv (depends on machine)

78
Q

The triangle formed by lines drawn between the mandibular incisors and right and left condyles

A

Bonwill triangle

4 inches

79
Q

The angle formed by the imaginary plane of the Bonwill triangle and the mandibular occlusal plane (described by the incisors and disto-buccal cusps of the mand 2nd molars).

A

Balkwil angle

80
Q

Composition of dental plaque

A

70% bacteria
30% intracellular matrix consisting of carbohydrates, proteins, calcium ions, and phosphate ions

81
Q

Landmarks for Campers plane

A

Inferior border of the right or left ala of the nose and the superior border of the tragus of the ears.

82
Q

Objectives of complete denture final impression

A

Preservation of hard and soft tissues—pressure in the impression technique is reflected in the denture base and can result in soft tissue damage and bone resorption
Support–maximum coverage of the appropriate denture bearing areas—the “snowshoe” effect
Stability—close adaptation to the underlying mucosa is important in reducing horizontal movement of the dentures
Esthetics—border thickness should be varied to restore facial contour and proper lip support
Retention—atmospheric pressure, adhesion, cohesion (depends on peripheral seal), mechanical engagement of undercuts, muscle control

83
Q

Denture impression philosophies

A

Muco-compressive

Muco-static

Selective pressure

Functional

84
Q

Thermoplastic modeling compound heat temp

A

Red 132-133

Gray 128-130

Green 122-124

85
Q

the composition of Dentsply IPN 3D denture teeth?

A

Urethane methacrylate
3,3,5, trimethyl cyclohexanol-Alkyl methacrylate
Ethylene Glycol Alkyl di-methacrylate
Phosphorolated bisphenol A urethane di-methacrylate oligomer
Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide
Carbon black
Titanium Dioxide
Butylated hydroxytoluene

86
Q

physical and mechanical properties of Dentsply IPN 3D denture teeth?

A

Wear resistance (Volume loss): 0.09 mg/400,000 cycles (ISO = > 65 MPa)
Flexural strength (130 MPa). (ISO = > 2000 MPa)
Compressive strength = 145 MPa (ISO = > 110 MPa)
Hardness: 0.41 GPa
Elastic modulus: 5.51 GPa

87
Q

classification of denture base materials?

A

a. Type 1—heat curing polymers—polymerization temp >60o C
b. Type 2—self curing polymers—polymerization temp <60o C
c. Type 3—thermoplastic materials—polymers moldable when heated
d. Type 4—light cured materials—cured by UV or visible light
e. Type 5—microwave materials—heat cured polymers cured with microwaves

88
Q

What is Ivobase

A

Combines benefits of heat cured and self-cured polymers.

Requires polymerization temp of only 40o C.

89
Q

Benefits of Ivobase

A

a. Thermal loss much lower
b. Increases in VDO are virtually eliminated—little to no post-processing polymerization adjustments required
c. Fracture toughness equivalent to heat-cured polymers
d. Low residual monomer content
e. Overall curing time is 35 min (Ivobase hybrid), 50 minutes for IvoBase hi impact)
f. Cooling time is 15 minutes

90
Q

What are the stages of polymerization following correct mixing of PMMA materials?

A

a. Sandy—little polymerization, grainy in appearance
b. Stringy-monomer molecules attack and dissolve PMMA particles, and disperse polymer changes in the liquid phase; larger PMMA particles unfold and enhance viscosity. Stage is characterized by sticky strings upon touching or stretching.
c. Doughy: characterized by lack of stringiness and stickiness—this is the suitable stage for packing into a flask.
d. Rubbery stage—further conversion of monomers into polymers, and evaporation of residual monomer. Rubbery appearance of the matrix (rebounds after releasing from compressive or tensile stresses)
e. Stiff stage: continued polymerization and evaporation—results in hardening and reinforcement of mechanical properties. PMMA becomes dry, stiff, and resistant to plastic deformation.

91
Q

What is the significance of residual monomer content?

A

May have a sensitizing effect on patients.

92
Q

What types of fibers may be used to enhance the PMMA base materials physical properties?

A

a. Carbon
b. Kevlar (aramid)
c. Nylon
d. Polyethelene and polypropylene
e. Glass

93
Q

What are prosthetic denture teeth made of?

A

PMMA, composite resin, or porcelain

94
Q

Muscles of soft palate

A

Palatoglossus

Palatopharyngeus

Tensor veil palatini

Lavator veil palatini

Musculus uvulae

95
Q

Contents of retromolar pad

A

Glandular tissue
Loose areolar tissue
Tendon of temporalis
Pterygomandibular raphe
Underlying cortical bone

96
Q

Contents of retromylohyoid fossa

A

Medial - mylohyoid
Posteromedial- palatoglossus
Posterolateral -superior constrictor
Distal - styloglossus

97
Q

Floor of the mouth

A

Mylohyoid
Genioglossus
Geniohyoid

98
Q

7 Muscles of modiolous

A

Buccinator
Obicularis oris
Risorius
Zygomaticus major
Zygomaticus minor
Levator anguli oris
Depressor anguli oris

99
Q

Saliva composition

A

Ptyalin(salivary amylase)-serous
Mucins-mucous
Bactericidal: Thiocyanate ions, proteolytic enzymes, protein antibodies

100
Q

Wolfs law

A

A bone will develop the structure most suited to resist the forces acting on it

101
Q

Mucosa in mouth

A

Superior to inferior:
Mucous membrane-mucosa-submucosa(vessels and nerves)-periosteum-bone
Masticatory Mucosa-submucosa has base of fibrous CT and covering of keratinized CT
Gingiva and palatine raphe have no submucosa
Lining Mucosa-nonkeratinized
Specialized Mucosa-dorsum of tongue, has taste buds

102
Q

What’s in hamular notch

A

Junction of maxillary tuberosity and hamular processes of medial pterygoid plate

Origin of pterygomandibular raphe

Tendon of tensor veil palatini

103
Q

Innervation of tongue

A

Anterior 2/3: lingual nerve
Posterior 1/3: glossopharyngeal

Taste: chorda tympani (branch of facial)

Motor: hypoglossal

Protrudes tongue: genioglossus

Blood supply: lingual artery

104
Q

Ligaments that attach to mandible

A

Collateral
Origin: Medial and lateral poles of disc
Insertion: Medial and lateral poles of condyles
Function: Restrict movement of disc away from condyle

Capsular
Origin: superiorly to temporal bone
Insertion: inferiorly to neck of condyle
Function: resists medial, lateral, inferior forces that tend to dislocate articular surfaces It encompasses entire TMJ, is well innervated and gives proprioceptive feedback

Temporomandibular
Outer oblique portion
Origin: articular tubercle(outer surface) and zygomatic process Insertion: Condylar neck(outer surface)
Function: Permits rotation but limits it also (not >15mm)
Inner Horizontal portion
Origin: articular tubercle (outer surface) and zygomatic process
Insertion: lateral pole of condyle and posterior part of articular disc
Function: limits posterior movement, provides bracing for lateral and retruding movements

Sphenomandibular ligament
Origin: spine of the sphenoid bone
Insertion: lingual
Function: no limiting effects on mandibular movement

Stylomandibular ligament
Origin: styloid process
Insertion: angle and posterior border of mandible
Function: Limits excess protrusion of the mandible

105
Q

Action of levator veli palatini

A

elevates soft palate, brings lat pharyngeal wall medially

106
Q

Action of uvulus

A

Thickens and lengthens soft palate

107
Q

Action of superior constrictor

A

Brings post pharyngeal wall anteriorly

108
Q

has intact structures but has inability to perform closure (neurological)

A

palatal pharyngeal incompetency

109
Q

Palate does not have intact structures

A

palatal pharyngeal insufficiency

110
Q

Innervation of speech

A

V: muscles of soft palate (trigeminal)
VII:muscles of periphery of mouth (facial)
IX: pharyngeal muscles (glossopharyngeal)
X: pharyngeal muscles, laryngeal muscles, soft palate (vagus)

111
Q

What is the physiology of speaking?(Martone)

A

Three Physiologic Valves
•True vocal folds of the larynx
•Palatalpharyngeal region: nasal, oral and laryngeal pharynx
•Mouth

112
Q

What is the physiology of gagging?

A

Afferent to medulla oblongata: V, IX, X; general innervates fauces, base of tongue, palate, uvula, and posterior pharyngeal wall(common trigger points)
Efferent: V,VII,X,XII, pharyngeal plexus(IX,X,XI), various sympathetic and parasympathetic nerves

113
Q

Causes of gagging

A

Systemic, Psychological, Physiological, Iatrogenic(overextended, too thick, highly polished, inadequate postdam)

114
Q

Reason to use fully adjustable articulator

A

Anterior/posterior control

Centric stop

Anatomical accuracy

115
Q

Celenza classification

A

Class I: simple holding
Class II: vertical and horizontal movement, but not related to TMJ
A: motion unrelated to pt
B: motion based on theories
C: motion based on patient
Class III: condylar pathways using average anatomic values
A: static protrusive records
B: accepts lateral records
Class IV: 3-D registrations
A: paths formed by patient (TMJ)
B: paths from settings and inserts (D5A)

116
Q

Who developed first facebow

A

Snow

117
Q

Arcon vs. non arcon

A

Arcon is where is condylar elements are on the lower member and semi adjustable has condylar pathways based on scientific averages

Non arcon condylar element is on the upper member, you can get a 8 degree difference in the arc of closure if you increase the pin opening or from you CR records

118
Q

What is average intercondylar distance

A

110mm

119
Q

Mandibular movement averages

Horizontal Condy Inclination
IMLT
Progressive
Curve of eminentia
Intercondyler distance
Bennett

A

Horizontal Condy Inclination 37 degrees
IMLT .75mm
Progressive 7.5mm
Curve of eminentia 3/4 inches
Intercondyler distance 110mm
Bennett 16 degrees

120
Q

Hanau Quint

A

Condylar Inclination
Incisal Guidance
Compensating Curve
Cusp Height
Plane of Occlusion

121
Q

Jaw movement measurements

Hinge

Max opening

Excursive

A

Hinge: 20mm

Max opening: 40-60mm

Excursive: 8-10mm

122
Q

Bodily shift in the mandible in the direction of the working side

A

Laterotrusion

123
Q

Long centric

A

The anterior teeth should immediately disclude the posterior teeth but at a controlled angulation so that you don’t lock the patient in. The patient must have an unimpeded path to centric relation. PMS

124
Q

Detrusion, surtrusion, retrusion definitions

A

Laterodetrusion: lat and down on working side
Laterosurtrusion: lat and up on working side; greatest effect since it brings arches closer together
Lateroretrusion: lat and back on working side

125
Q

What systemic conditions affect the basal seat/denture prognosis

A

Osteoporosis
Xerostomia
Mucosal disorders
Burning tongue
Dermatalogic disorders
Radiation Therapy
Chemotherapy

126
Q

Soft liner vs. tissue conditioner

A

Tissue conditioner- less viscous – more flow, change and adaptation to the tissues, flow easily and have a low viscosity; Coe-soft.
Soft liners – more viscous; Coe comfort

127
Q

What are soft liners made of?

A

Soft Liners are plasticized acrylic resins, either PMMA or PEMA and the liquid plasticizer dibutly- phthalate. The large plasticizer minimizes entanglement of polymer chains, thereby permitting chains to slip past each other to allow a rubbery-like state. The liquids do not contain acrylic monomers only to be used short term. Plasticizers leach out over time and the material becomes more rigid. Biggest issue is the inability to thoroughly clean the surfaces, hence candida albicans is a major issue.

128
Q

What is the REALEF Effect?

A

The resilience and like effect was described by Hanau and is used to describe the fact that the soft tissue under the denture base has movement so it compensates for any limitations of the articulator.

129
Q

Discuss mucostatic impression?

A

Henry Page; soft tissue should be in unstrained postion for impressions; relies on interfacial surface tension for retention; disregards cohesion (like) and adhesion (unlike)
Resulting denture is almost flangeless and will not be very retentive

130
Q

Discuss selective pressure technique?

A

Peripheral tissue s are slightly displaced to increase retention
You displace the tissues just enough to get retention but not to loose stability This method uses adhesion, cohesion and surface tension

131
Q

Border molding maxilla

A

Anterior: lip is elevated and extended outward, downward, and inwar.(orbicularis oris fibers run horizontal –only indirect effect); no muscles in labial vestibule
Buccal Frenum: Cheek is elevated and pulled outward, downward and inward; also it is moved forward and backward to simulate movement of both the orbicularis oris and the buccinators; the levator anguli oris is under the buccal frenum
Posterolateral: rub with hand, open wide, move jaw side to side; pterygomandibular raphe (buccinators/sup constrictor) and coronoid process, and also medial pterygoid when patient open up wide

132
Q

Border molding mandible

A

Labial flange: lift the lower lip outward, upward and inward ; mentalis and orbicularis oris Buccal Frenum:
Cheek is lifted outward, upward, and inward, backward and forward to simulate frenum movement; depressor anguli oris is under buccal frenum
Posteriorly: cheek is pulled buccally to ensure that tissue is not trapped, then the cheek is moved upward and inward.
Anterior Lingual Flange length(PM TO PM): Ask patient to protrude the tongue activates the genioglossus, raises sublingual fold
Anterior lingual flange thickness: push the tongue against the front part of the palate
Posterior edge of posterior lingual flanges: when tongue is pushed against the front part of palate it activates mylohyoid AND the superior constrictor which supports the retromylohyoid curtain) Inferior edge of both posterior lingual flanges: are border molded by touching tongue out and then into the opposite cheek; floor of retromyhoid region is the palatoglossus
Distal of retromolar pad and masseteric notch:
Open wide caused pterygomandibular raphe to be brought forward, thrust tongue out and then close the mouth. The downward pressure on the mandible activates the elevators of the mandible thus the masseter pushes on the buccinator marking the masseteric groove and medial pterygoids push against the retromylohyoid curtains distal end of the lingual flange.

133
Q

Stress bearing areas maxilla

A

Primary stress bearing areas: hard palate lateral to median raphe
In some patients the maxillary ridge crest is considered a primary stress bearing area and in other patients it is considered a secondary stress bearing area (Jacobsen & Krol)

134
Q

Stress bearing areas mandible

A

Primary stress bearing areas: buccal shelf and pear shaped pad

Secondary stress bearing areas: residual ridges

135
Q

House Personality classification

A

Hysterical-most difficult, poor prognosis
Indifferent
Philosophical
Exacting

136
Q

Cross tooth cross arch advantages

A

Zarb - Boucher text
-Better aesthetics
-Ease of penetration of food
-Stablility during swallowing and parafunctional movements Introduced by Gysi 1927

137
Q

Occlusal spectrum

A

Parr and Loft 1982
Anatomic
Semi Anatomic
Lingualized
NonAnatomic
Neutrocentric – NonBalanced (DeVann)

138
Q

What factors affect denture Stability? (Jacobsen and Krol)

A

Tissue surfaces (lingual flange, residual ridges shape and contour)
●Polished surfaces (muscles must not be interfered with by denture base and the muscles may help seat and stablilize denture base. Note: Fish though that polished surfaces were the most impt factor in stability
●Occlusal surfaces: Free of interferences

139
Q

What factors affect denture Support?(Jacobsen and Krol)

A

Extension to maximum surface area and border extensions. Note: Tissues that resist resorption and vertical displacement have more pressure under function.

140
Q

Maxilla shapes

A

Flat, round, u shaped, v shaped

141
Q

Wright classification tongue position

A

Class 1 normal
Class 2 normal but broad and flat
Class 3 retruded

142
Q

House tongue size classification

A

Class 1 normal
Class 2 teeth absent long enough for tongue to flatten
Class 3 excessively large

143
Q

Why choose Stratos 300?

A

Fulfills Celenza class IIIB semi adjustable

Control of horizontal condylar inclination and Bennett angle

144
Q

6 Advantages of Stratos 300

A

Wide posterior view

Centric latch to only allow hinge movement in CR

Curved condylar path (12.5)

Ability to incorporate protrusive and lateral check bite records

Incisal table with a fixed pin

Arcon articulator with condylar element on lower member following pt arc of closure

145
Q

Adjustable elements of Stratos 300

A

Bennett angle 0-30
IMLT 0-1.5mm
Protrusive advance 0-4mm
Retrusive advance 0-2mm

146
Q

Stratos based on 4 main geometric conditions

A

Campers plane

Balkwil, angle

Bonwill triangle

Monsoon template

147
Q

How did you program articulator for HCI and laterotrusion

A

HCI - protrusive check bite

Laterotrusion - Hanau formula or lateral check bite

148
Q

Process denture base materials

A

Ivobase

Ivocap

Press pack (lucitone 199)

149
Q

3 ways to determine PPS

A

Functional - Iowa wax

Semi functional - border model

Arbitrary- 1-2,m beyond vibrating line

150
Q

Shapes of PPS

A

Butterfly
Bead
Butterfly with roll
Double bead

151
Q

Denture adhesive categories

A

Adhesives - methyl-cellulose
Anti-microbial agents - sodium tetraborate
Others - wetting agents

152
Q

Specs for microstone

A

ISO Type 3
Brand:Premium dental stone
40ml/140g water to powder
5-7min working time 15 min set time
0.12% expansion
Compressive strength (MPA) after 1 hr 31 after 48 hr 59

153
Q

Specs for mounting plaster

A

ISO type 1
Brand: “low expansion fast setting plaster”
63ml/100g water powder
60-90s working time 3 mins setting time
.09% expansion
Compressive strength (MPA) 1 hr 4 after 48 hrs 12

154
Q

What does UTS stand for

A

Universal transferbow system

155
Q

Anatomic structures for s curve

A

Mylohyoid, palatoglossus, superior constrictor

156
Q

What impression philosophy did you use and why

A

Selective pressure- putting selective pressure on primary denture bearing areas

157
Q

Why do teeth stay balanced in mouth

A

Realeff and denture movement

158
Q

What limitations to my articulator

A

Cannot adjust intercondylar distance

159
Q

What error comes from arbitrary facebow

A

Not accurately find hinge access

.2mm error - Weinberg

160
Q

Gypsum formula

A

Ca sulfate hemihydrate + water = calcium sulfate dehydrate + heat

161
Q

The process of heating gypsum to drive off part of crystallization to form hemihydrate

A

Calcination

162
Q

Gypsum classifications

A

Type I Impression Plaster - 15% exp
Type II Model Plaster - .30% exp
Type III Dental Stone - .20% exp
Type IV Improved stone - .10 exp
Type V High Strength, Exp - .30 exp

163
Q

Alginate composition

A

Potassium alginate
Calcium sulfate dehydrate
K Phosphate
Na Phosphate
Diatemaceous Earth
Glycols

164
Q

PVS composition

A

Base: dimethyl siloxane with silane groups
Fillers such as copper carbonate which control consistency

Accelerator: vinyl terminated siloxane Chloroplatinic acid

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