MDS PREP
The average overall length of the permanent maxillary central incisor is
1. 14.5mm
2. 18.0 mm
3. 22.5 mm
4. 30 mm
Dental Anatomy
Answer: 3
The average overall length of the permanent maxillary central incisor is 22.5 mm
A mandibular primate space is usually found in the primary dentition between
1. first and second molars
2. central and lateral incisors
3. lateral incisor and canine
4. canine and first molar
Dental Anatomy
Answer: 4
A mandibular primate space is usually found in the primary dentition between canine and first molar
The canine eminence is
1. associated with the mandibular canine only
2. the labial ridge on the crown of canine
3. an osseous structure surrounding the root of a canine on the facial aspect
4. the prominent ridge on the lingual surface of a maxillary canine
Dental Anatomy Answer: 3
The canine eminence is
an osseous structure surrounding the root of a canine on the facial aspect
In an average child the mixed dentition period is from
1. 10 years to 25 years
2. 4 yrs to 12 yrs
3. 8 yrs to 17 yrs
4. 6 yrs to 13 years
Dental Anatomy
Answer: 4
In an average child the mixed dentition period is from 6 yrs to 13 y
The most constant and valuable trait to differentiate among maxillary first second and third molars is the
1. comparative size of the cusp of Carabelli
2. height of cusps
3. depth of central fossae
4. relative position of the distolingual groove
Dental Anatomy
Answer: 3
The most constant and valuable trait to differentiate among maxillary first second and third molars is the depth of central fossae
Primary teeth begin to calcify between the ________ and ________months in
utero.
1) first; second
2) second; fourth
3) fourth; sixth
4) sixth; eighth
The primary teeth begin to form in utero at about six weeks. Hard tissue
formation occurs in all primary teeth by the 18th week in utero. 3. The
permanent teeth begin to develop at approximately four months of age in utero.
Maxillary and mandibular first molars begin to calcify at birth.
When calcospherites fail to fuse during calcification of dentin matrix then
1 Interglobular dentin is formed
2 Dead tracts are found in formed dentin
3 Irregular dentin results
4 None
Dental Anatomy
Answer: 1
Sometimes, mineralization of dentin begins in small globular areas that fail to coalesce into a homogenous mass. This results in zones of hypomineralization between the globules.
These zones are known as globular dentin or interglobular spaces. Thus, demonstrating defect of mineralization and not of matrix formation, the dentinal tubules pass uninterruptedly through interglobular dentin.
How many root canals does a madibular first molar normally have
1. 2
2. 3
3. 4
4. 5
Dental Anatomy
Answer: 2
madibular first molar normally have 3 root canals