Viet Deck Dental Anatomy/Occlusion-- Anterior teeth information

• central incisors •lateral incisors

A 1-year-old child is expected to have erupted which of the following primary maxillary and mandibular teeth? Select all that apply. • central incisors •lateral incisors •canines • first molars • second molars

primary canines and second molars *At age 15 months, 12 teeth are erupted (four centrals, four laterals, and four first molars)*

A 15-month-old child walks into your office and begins to cry and hold his mouth in pain. Which teeth have probably not been traumatized, as they are not usually present at 15 months of age? • primary lateral incisors and canines • primary canines and second molars • primary central and lateral incisors • primary first and second molars

• difference in rotation of the crown on the root

A clinical examination of your patient reveals two lower incisors centered on the midline. The patient gives a history of a car accident when he was young where he lost two of his lower front teeth. He says that his dentist used braces to fill in the gaps. Which of the following criteria would be most reliable to decide if the remaining teeth were lateral or central incisors? • difference in root length • difference in ratio of crown length to root length • degree of slope of the incisal edge when viewed facially • difference in rotation of the crown on the root

• it has a more pronounced cingulum • it is wider mesiodistally

A hockey player comes into your office holding his friend's right canines (max- illary and mandibular) in his hand. His friend, a lacrosse player, got hit by a ball flying under his mask. Which of the following would you look for in the maxillary canine as compared to the mandibular canine? Select all that apply. • it is narrower mesiodistally • it has a more pronounced cingulum • it is wider mesiodistally • it has a shorter root

the distal surface is fuller and more convex than the mesial surface

A hockey player comes into your office with his six upper anterior teeth in his hand. How can you distinguish the right canine from the left canine? • the root always curves to the distal in the apical one-third • the distal surface is fuller and more convex than the mesial surface •lingually, the cervical line slopes mesially

mandibular and maxillary incisors

A mother brings her 1-year-old into your office the day after his first birthday. She says the pediatrician said to have the first dental check-up by this time. What primary teeth are you expecting to see when the child opens? • mandibular incisors only • mandibular and maxillary incisors • all incisors and maxillary canines • all incisors and mandibular canines

the youngest child is 10 and has adult mandibular canines only

A mother brings her three kids to your office for their annual check-ups. Which of the following statements is most likely to be true? • the middle child is 11 and has no adult canine teeth • the youngest child is 10 and has adult mandibular canines only • the youngest child is 10 and has adult maxillary canines only

12

A pediatric patient of yours complains of severe pain on chewing. On clinical exam, you see an eruption cyst in the place of the mandibular second molar. What is the most likely age of this patient? ·8 ·10 ·12 ·14

Mandibular lateral incisor

A stray crown is found in your office. It is an anterior tooth and has a cingulum that is offset from center. What tooth is it most likely to be? • maxillary canine • maxillary lateral incisor • mandibular central incisor . mandibular lateral incisor

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After the permanent teeth have reached full occlusion, small tooth movements occur to compensate for wear at the contact areas by *mesial drift* and occlusal surfaces by * root apex cementum deposition*

permanent first molars

As soon as a child gets his/her _______ he/she is considered to be in the mixed dentition. • permanent canines • permanent first molars • permanent second premolars

12

At 9 years of age how many primary teeth are present in the mouth? ·0 ·8 ·12 ·18

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Both the *mandibular central and lateral incisors* have a *lingual cervical line* that is positioned more *apically than the facial cervical line *

4,6 10

For primary dentition, the crowns of all 20 teeth begin to calcify between *___ to ___* months in utero,and on average take *______ months* for completion. In general,the root of a *deciduous* tooth is completely formed in just about *one year after eruption* of that tooth into the mouth

maxillary canine

In maximum intercuspation, which anterior tooth is unique in that it contacts with both anterior and posterior segments of the opposite arch? • maxillary first premolar • maxillary canine • mandibular canine

Know these

Maxillary Canine

1) *Mandibular lateral/canine* 2) *maxillary central incisor*

Name the anterior teeth that has *cingulum offset* from the *Center*

1) * Maxillary lateral/canine* 2) * Mandibular central*

Name the anterior teeth with *cingulum center* to the cervical third

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Near the roof of the pulp chamber,the *elliptical *form of the pulp cavity is *widest* in the *mesiodistal* direction; however, near *midroot* the elliptical form is *widest* in the *faciolingual direction*. A small percentage have two canals.

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Other ways to distinguish the mandibular lateral from the mandibular central: •The lateral is *larger overall* (especially mesiodistally) • The lateral is *not as bilaterally* symmetrical as the central incisor • The *cingulum on the lateral is slightly distal* to the center • On the lateral incisor, the *mesial marginal ridge is longer* than the distal marginal ridge. On centrals, they are the same length • Lateral incisors have the *distal proximal contacts more apical* than the mesial con- tacts. Centrals are at the same level • Lateral incisors have the *distoincisal angles more rounded* than the mesioincisal angles. On centrals, the angles are nearly the same

6-7 7-8 7-8 8-9

Permanent Dentition Eruption Sequence The *Mandibular* central incisors erupted at the age of *____to____* yrs and the *lateral incisors* at * ___ to ____* The Maxillary central incisors erupted at the age of *____to____* yrs and the *lateral incisors* at * ___ to ____*

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The *CEJ curvatures are greater on the mesial than the distal* (see pictures below) for mandibular central incisor and canine

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The *Canines for both Mand and Max* are the only teeth with *Labial ridge*

10-12 11-12 10-11 10-12

The *Mandibular* *first premolar* erupted at the age of *____to____* yrs and the *second premolar* at * ___ to ____* The *Maxillary* *first premolar* erupted at the age of *____to____* yrs and the *second premolar* at * ___ to ____*

11-13 17-21 12-13 17-21

The *Mandibular* *second molar* erupted at the age of *____to____* yrs and the *third molar* at * ___ to ____* The *Maxillary* *second molar* erupted at the age of *____to____* yrs and the *third molar* at * ___ to ____*

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The *canines* (both maxillary and mandibular) are the *only cusped teeth* which feature a *functional lingual surface* rather than a functional occlusal surface.

6-7

The *first permanent molar* for both mandibular and maxillary erupted at *___to___*

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The *labial (facial) surface of canines is marked by a pronounced labial ridge* (see facial view below). Shallow *developmental depressions* lie mesial and distal to the labial ridge. On the mandibular canines, the labial ridge and the developmental depressions are not as pronounced.

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The *mandibular central is the ONLY* anterior tooth in which the *distoincisal angle is as sharp and distinct as the mesioincisal angle*. All other incisors show a more or less rounded distoincisal angle.

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The *mandibular lateral incisor* crown tips slightly to the *distal relative to the root* (facial view).

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The *maxillary canine is the longest tooth* in the mouth. The *mandibular canine has the longest crown* of any permanent tooth.

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The *mesial and distal* aspects of all *mandibular posterior teeth* have a *rhomboidal outline*

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The *most prominent labial ridge* on the permanent canines is the *middle*

11-12 9-10

The Maxillary* canine* erupted at the age of *____to____* yrs and the Mandibular canine at *____to___*

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The earliest indication of mixed dentition consists of the primary dentition and the *permanent first molars *(usually the mandibular permanent first molars). The mixed dentition period ends with the *exfoliation of the last primary tooth (normally the maxillary canine)*

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There are three periods ofdentition in man: 1. The primary dentition (approximately* 6 months to 6 years*) 2.The mixed dentition (approximately *6 to 12 years*) 3. The permanent dentition (*12 +years*)

10-12 years old

Tommy, a pediatric patient of yours, says he lost his top vampire tooth last week and the tooth fairy gave him a dollar for it. What is Tommy's most likely age range when he lost his maxillary canine tooth? • 6-7 years old • 7-8 years old • 10-12 years old • 14-16 years ol

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We used a geometric schematic to represent the *outline of crowns* which includes *triangle, trapezoidal, rhomboid* 1) *Triangle* for anterior teeth, *mesial or distal viewed* 2) *Trapezoid* for anterior teeth, *labial or lingual* 3) *Trapezoid*--for premolars, *buccal or lingual * 4) *Rhomboid*--for premolars, *mesial or distal * 5) *Trapezoid*--for Molars, *buccal or lingual* 6) *Rhomboid*--for molars, *mesial and distal*

12 six maxillary anterior teeth and six mandibular anterior teeth

What is the *total number of cingula* in each dentition _______

canine

What tooth (both maxillary and mandibular) are the *only cusped teeth* which feature a *functional lingual surface* rather than a functional occlusal surface.

Maxillary canine

What tooth has 1) *no contact on the cusp tip* 2) It falls in direct alignment with the *facial embrasure* between the mandibular canine and first premolar. 3) This anterior tooth is unique in that it has *antagonists, in the intercuspal position, in both anterior (canine) and posterior (first premolar)* segments of the opposite arch.

trapezoidal outline

When looking at the facial or lingual aspect of all anterior teeth, they have a: • trapezoidal outline • triangular outline • rhomboidal outline • square outline

continuous convexity incisoapically on the facial surface

Which characteristic below is *common to all mandibular anterior teeth?* • distinct cingula with grooves and pits • incisal edges that are facial to the root axis line • facial surfaces that are marked by pronounced labial ridges • continuous convexity incisoapically on the facial surface

distal

Which cusp ridge is the longest on the permanent canines? · labial • lingual •mesial • distal

. girl's teeth usually erupt before boy's teeth of the same age • mandibular teeth usually erupt before maxillary teeth • the teeth of slender children usually erupt before the teeth of stocky children

Which of the following are the cardinal rules regarding the eruption of teeth? Select all that apply. • boys' teeth usually erupt before girls' teeth of the same age . girl's teeth usually erupt before boy's teeth of the same age • maxillary teeth usually erupt before mandibular teeth • mandibular teeth usually erupt before maxillary teeth • the teeth of slender children usually erupt before the teeth of stocky children • the teeth of stocky children usually erupt before the teeth of slender children

• distoincisal of the mandibular lateral incisor

Which of the following line angles is least "square"? • mesioincisal of the mandibular lateral incisor • distoincisal of the mandibular lateral incisor • mesioincisal of the mandibular central incisor • distoincisal of the mandibular central incisor

labial ridge

Which of the following terms is specific to canines? •labial ridge • linguaI fossa • mamelons • cingulum

maxillary central incisor

Which tooth has a pulp chamber that is least like the others? • maxillary central incisor • mandibular central incisor • maxillary lateral incisor • mandibular lateral incisor

3,4

*Calcification* of the roots is normally completed by the age of *____or ___* *Active eruption* of teeth occurs after *2/3* of the root is formed

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*Maxillary canines* erupt between the ages of *11 -12*-- *after* the premolars *Mandibular canines* erupt between the ages of *9-10* --*before* the premolars

11-12, after 9-10, before

*Maxillary canines* erupt between the ages of *___--____*-- *(before/after)* the premolars *Mandibular canines* erupt between the ages of *____--____* --*(before/after)* the premolars

• the permanent maxillary and mandibular premolars

*Nonsuccedaneous* teeth include all of the following EXCEPT one? Which one is the EXCEPTION? A permanent tooth that moves into a position formerly occupied by a primary tooth is called a succedaneous tooth • the permanent maxillary and mandibular premolars • the permanent maxillary and mandibular first molars • the permanent maxillary and mandibular third molars

Rules of Four

*Rule of four*: This simplified rule will enable you to determine the number of teeth present at any given time. It implies the eruption of *four teeth* every *four months* beginning with *four teeth at age seven months* *central, laterals, 1st molar, canine, second molar*

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*Summary of Schematic Outlines of the Tooth Crowns* *Trapezoids* with *longest uneven side* toward occlusal or incisal surface 1) All anterior teeth, maxillary and mandibular - labial and lingual aspect 2) All posterior teeth- buccal and lingual aspect

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*Summary of Schematic Outlines of the Tooth Crowns* *Triangles* is for *Six anterior teeth, maxillary and mandibular - mesial and distal aspect* • *Trapezoids* with *longest uneven side* toward occlusal or incisal surface • All anterior teeth, maxillary and mandibular - labial and lingual aspect • All posterior teeth- buccal and lingual aspect *Trapezoid with shortest uneven side* toward occlusal surface • All maxillary posterior teeth - mesial and distal aspect *Rhomboids* •All mandibular posterior teeth-mesial and distal aspect

both statements are true

*The mesial and distal aspects ofthe anterior teeth- central incisors, lateral in- cisors, and canines, maxillary and mandibular - may be included within triangles.* *The base of the triangle is represented by the cervical portion of the crown and the apex by the incisal ridge.*