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RD I > incisors and k9 > Flashcards

incisors and k9 Flashcards

1
Q

permanent incisors function

A

esthetics, phonetics and mastication (biting, cutting, shearing)

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2
Q

Class traits

A

characteristics of all incisors

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3
Q

Arch traits

A

characteristics that distinguish maxillary from mandibular incisors

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4
Q

Type traits

A

distinguish central from lateral in the same arch

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5
Q

Permanent Maxillary Incisors #

A

7,8,9 & 10

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6
Q

which crown is larger in maxillary incisors

A

central incisors

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7
Q

Maxillary Central Incisor – Labial View

A

Basic geometrical shape trapezoidal
Generally convex mesiodistally and incisocervically
Widest of the incisors
longer incisocervically than it is wide mesiodistally

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8
Q

why is Convexity important to reproduce

A

so that the teeth are easier to clean and don’t have food traps

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9
Q

Mamelons

A

rounded protuberances which are present on the cutting edge of an incisor tooth when it first erupts through the gum; are quickly worn away by use.

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10
Q

Imbrication Lines

A

horizontal striations near the cervix/gingiva that are a result of a change in the growth process

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11
Q

Maxillary Central Incisor – Palatal View

A

Fossa bounded by 4 convexities (cingulum, marginal ridges, incisal edge)
Mesial marginal ridge is longer than distal marginal ridge
Cingulum offset to the distal to allow room for the incisal papilla

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12
Q

Max central lingual view

A
  • 2 marginal ridges
  • 1 lingual fossa
  • Cingulum
  • MMR>DMR
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13
Q

Maxillary lateral Incisors

A 
▪ Smaller sized – incisal edge slope cervical
▪ to the distal 
▪ Rounded angles / MMR>DMR
▪ Pit in lingual fossa
▪ Palatogingival groove
▪ Root tip has distal curvature
▪ Diamond shaped outline
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14
Q

Mandibular Central Incisors

A

▪ Exhibit symmetry with one another
▪ Show Incisal wear
▪ Longer faciolingually than they are wide mesiodistally
▪ Marginal ridge lengths are the same

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15
Q

Mandibular Lateral Incisors

A

▪ Slightly wider than central
▪ Have mesial and distal root concavities
▪ Cingulum offset distally
▪ Incisal edge twisted
▪ Both marginal ridges visible in mesial view
▪ Longer MMR than DMR
▪ Distal of incisal edge may be more lingual (distolingual twist)

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16
Q

Canines (6,11 // 22,27)

A

o Longest of the permanent teeth
o Cornerstones of the arches
o Richest supply of proprioceptive nerve endings
o Crowns are wider faciolingually than mesiodistally
▪ Similar to Mandibular central incisors but different from max
o Functions
▪ Support the lip and facial muscles
▪ Cut or pierce food
▪ Act as guideposts in occlusion illary incisors

17
Q

Root axis line

A

from the facial or lingual aspect it divides the root at the cervix into mesial and distal halves; from the proximal aspects it divides the root at the cervix into facial and lingual halves

18
Q

Maxillary Canine

A

Longest teeth of the permanent dentition (root apex to cusp tip)

19
Q

Canine eminence

A

special projection of bone in the maxilla that houses the long, thick root of the canine
• Anterior to the eminence lies the Incisal fossa and posterior to the eminence lies the canine fossa

20
Q

Labial View k9 max

A
  • Cusp and cusp ridges make up 1/3 of the incisocervical length of the crown
  • The middle labial lobe is called the labial ridge
21
Q

Lingual View k9 max

A
  • Lingual cusp ridge separates the mesial and distal fossae
  • The cingulum is large and centered mesiodistally
  • Mesio marginal ridge is longer than the distal marginal ridge
22
Q

Proximal View k9 max

A
  • Wedge-shaped
  • Cusp tip is labial to the root axis line
  • Has one root that is very broad faciolingually in cervical third and even more so in the middle third
  • The root has mesial and distal depressions – better anchoring
  • For maxillary incisors and canines the incisal edge/cusp is either on the root axis line or labial to it… never lingual to it
23
Q

Incisal View k9 max

A
  • Wider faciolingually than mesiodistally

* Lingual ridge and cingulum visable

24
Q

Labial View k9 man

A
  • The crown is longer and narrower than the maxillary canine
  • The mesial surface is flat and in line with the mesial side of the root
  • The cusp and cusp ridges make up 1/5 the incisocervical length of the crown
25
Q

Lingual View k9 man

A
  • Ridges and fossae not prominent

* Cingulum lies distal to the root axis line

26
Q

Proximal View k9 man

A
  • For Mandibular incisors/canines the Incisal edge/cusp tip lies either on or lingual to the root axis line… never labial to it
  • Almost continuous crown-root convexity on the facial side with minimal crown or root bulge
  • Sometimes can have two roots
27
Q

Incisal View k9 man

A
  • Oblong – longer labiolingually than wide mesiodistally

* Anatomy is less obvious than the maxillary canine

RD I (5 decks)

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