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Textbook > 7 - Local Contributing Factors > Flashcards

7 - Local Contributing Factors Flashcards

1
Q

What causes CEPs

A

Amelogenesis fails to halt before root development

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2
Q

3 grades and characteristics of CEPs

A

Grade 1 - distinct change in CEJ pointing to furcation
Grade 2 - CEP approaches but does not enter furcation
Grade 3 - CEP extends into furcation

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3
Q

Prevalence of CEPs (3 sources)

A

Hou and Tsai - 85% of molars w/ furcation involvement
Masters and Hoskins - MAN molars 28.6%, MAX molars 17%
Masters - 90% of isolated furcations

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4
Q

Most common tooth w/ CEP

A

2nd molars, buccal

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5
Q

CEP proximity to pulp (source)

A

Sterit - Up to 1.6mm

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6
Q

Prevalence and location of enamel pearls (source)

A

Moskow & Canut

2.69% on molars

Maxillary 3rd molars

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7
Q

Bifurcation ridge

  • Location
  • Direction
  • Prevalence
  • Source
A

Mandibular 1st molar
Run M-D centered B-L
70%
Dunlap and Gher

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8
Q

Palatogingival grooves

  • Prevalence
  • Location
  • Termination
  • Source
A

3% centrals, 6% laterals
54% terminate on root
Kogon

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9
Q

Attachment area MAX 1M (source)

A 
Herman
Root trunk 32%
MB 25%
Palate 24%
DB 19%
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10
Q

Attachment area MAN 1M (source)

A

Dunlap & Gher
Root trunk 31%
Mesial 37%
Distal 32%

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11
Q

Maxillary - average root trunk lengths (source)

A

Kerns
Max 1st Molar: (4) F 4.11, M 4.73, D 4.66
Max 2nd Molar: F 4.29 M 6.4 D 4.83 (so a little longer than the 1st
Max 1st Premolar: (7.7) M 7.76 D 7.71

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12
Q

Mandibular - average root trunk lengths (source)

A

Kerns
Man 1st Molar: (3) F 3.27 L 4.28
Man 2nd Molar: (3) F 3.28 F 3.83

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13
Q

What % does root trunk and root make up of the attachment area?

A

30% root trunk

70% roots

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14
Q

% w/ root grooves on 1M and 2M (source)

A

Kerns
50-60% 1M
90% 2M

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15
Q

Significance of root grooves

A

Plaque accumulation
Attachment loss
Predispose to furcation involvement

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16
Q

Prevalence of furcation entrance widths (source)

A

Bowers

81% <1mm
58% <0.75mm

17
Q

Average distances for interroot separation

A

2-3mm B-L

4-4.5mm M-D

18
Q

Root fusion prevalence and gender (source)

A

Hou

Root fusion 23%
5% more common in females
Max 2M > Man 2M > Max 1M > Man 1M

19
Q

Root fusion prevalence MAX vs MAN (source)

A

Ross

30% of molars with fused roots. 35% MAX, 24% MAN

Max 3rd (89%)
Man 3rd (52%)
Max 2nd (52%)
Man 2nd (45%)
Max 1st (8%)
Man 1st (3%)
20
Q

Cemental tears (source)

A

Leknes

Separated fragments of cementum w/ or w/o dentin attached

Occlusal trauma?

21
Q

Furcation accessory canals

  • Source
  • Prevalence
A

Gutmann
28.4% furcation
Mandible > maxilla

22
Q

Accessory canals

  • Source
  • Prevalence
A

Kirkham
23% with at least 1, majority in apical 1/3

Man PM 53.5%
Man M 44.5%
1M > 2M

23
Q

Relevance of root proximity to Interradicular bone (source)

A

Heins & Weider
<0.3mm PDL
0.3-0.5mm cortical bone
>0.5mm cortical + cancellous

24
Q

Devore and Wojcik - hopeless teeth prognosis

A

Maintained hopeless teeth had no effect on adjacent teeth

25
Q

Machtei - hopeless teeth prognosis

A

Mean bone loss next to retained hopeless teeth 10X higher over 4 years

26
Q

Grass - hopeless teeth prognosis

A

Hopeless tooth remains untreated patient may benefit from extraction

27
Q

Ehnevid and Jansson - hopeless teeth prognosis

A

Max 2PM w/ increased distal PD if adjacent Max 1M had mesial furcation involvement

28
Q

Effect of overhang restorations (3 sources)

A

Waerhaug - increase microbial sphere of influence
Wang - alters composition of microbes
Jeffcoat and Howell - medium (20-50%) and large overhangs increase bone loss

29
Q

Biologic width (source)

A

Gargiulo

  1. 07mm CT
  2. 97mm JE
30
Q

Distance from base of sulcus and restoration margin?

A

1-2mm

Thus 3-4mm from bone

31
Q

Proper term for location of crown margins

A

Intracrevicular

32
Q

Different pontic types

A

Sanitary - gap of 3mm
Modified ridge lap - concave intaglio on facial, lingual is convex
Ovate - completely convex

33
Q

Effect of Angle’s classification on periodontal status (source)

A

Geiger

None as long as the teeth are kept clean

34
Q

Relation of toothbrushing and cervical abrasion (source)

A

Radentz

SS relationship between quantity of toothpaste and cervical abrasion

35
Q

Relation of gingival recession and toothbrush trauma (source)

A

Khocht

Greater amount of gingival recession in posterior sextant of dominant hand and in mandibular anterior

Textbook (17 decks)

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