Dental Anatomy NEET MDS Practice Test

1

Dental Anatomy

Primary teeth begin to calcify between the ________ and ________months in utero.

1) first; second
2) second; fourth
3) fourth; sixth
4) sixth; eighth

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

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.

2

Dental Anatomy

PDL width is maximum in:
1). Non-functional tooth
2). Tooth under heavy occlusal load / hyperfunction and tipped tooth at alveolar crest and apex
3). Middle third always
4). Apical region only

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

The PDL has an hourglass shape, narrowest at the mid-root due to the fulcrum of tipping forces. Hyperfunction increases width, and hypofunction decreases it.

3

Dental Anatomy

Width of PDL is:
1). 5-15 micron
2). 25-50 micron
3). 0.15 to 0.38 mm
4). 0.60 to 0.85 mm

Option 1

Option 2

Option 3

Option 4

📝 Explanation:

The average width of the periodontal ligament is 0.2 mm (150-380 microns). It is narrowest at the mid-root and has an hourglass shape. Its width increases with hyperfunction and decreases with hypofunction.

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