MDS PREP
The primary canine is usually exfoliated between the ages of
1. 5 and 6 years
2. 10 and 11 years
3. l3 and l4years
4. 8 and 9years
Dental Anatomy
Answer: 2
The primary canine is usually exfoliated between the ages of 10 and 11 years
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.
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
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.
9 months of age, is the usual eruption time for
1. primary mandibular canines
2. primary maxillary canines
3. primary maxillary first molars
4. primary lower lateral incisors
Dental Anatomy
Answer: 4
9 months of age, is the usual eruption time for primary lower lateral incis
Malformation of the coronal portion of the permanent anterior teeth is most frequently encountered in the
1. maxillary central incisor
2. maxillary lateral incisor
3. maxillary canine
4. mandibular lateral incisor
Dental Anatomy
Answer: 2
Maxillary lateral incisor agenesis:
This is the most common congenital absence of a permanent tooth in the maxillary
anterior region, accounting for about 20% of all dental anomalies.
Coronal developmental invagination (DI):This is a common anomaly in the
permanent maxillary lateral incisor, usually appearing as an accentuation of the
lingual pit.It's often bilateral.
Peg-shaped crown:This is a common alteration in the maxillary lateral incisor.
The primary mandibular central incisors usually erupt at
1. 6-8 months
2. 2 years
3. 10 - 13 months
4. 52 - 72 weeks
Dental Anatomy
Answer: 1
The primary mandibular central incisors usually erupt at 6-8 months
The permanent anterior tooth most often missing congenitally is the
1. maxillary central incisor
2. mandibular central incisors
3. mandibular lateral incisors
4. maxillary lateral incisors
Dental Anatomy
Answer: 4
lateral incisor is most often missing congenitally