DHYG 312 FINAL Questions with complete solution
2026/2027
1. Primary
-Formation of the primary teeth begins in utero
denti-tion
-Average age after birth when the enamel is completely formed before
the date of eruption
2. Mixed or
-Occurs b/w 6 and 12 years when primary teeth are being
Transi-tional
exfoliated and permanent teeth erupt
Dentition
-Succedaneous teeth are permanent teeth that erupt into the position
of exfoli-ated primary teeth
-32 teeth that replace the primary teeth and serve throughout life.
3. Permanent
-Roots are completely formed about 3 years after eruption into the oral
Den-tition cavity
-Table 16-1 Tooth development and Eruption: permanent teeth
4. Attrition -Mechanical wear due to tooth to tooth contact, bruxism
-More attrition is seen in men than women, often associated with increasing age
-Facet: small shiny, flat, worn spot on the surface of a tooth
-gradual reduction in cusp height; flattening of incisal or occlusal plane
-Staining exposed dentin
5. Abrasion -Mechanical wear due to foreign objects: stittness of toothbrush bristles
-Risk: pipe smoking, chewing pens, betel nut chewing, and pica (eating nonfood
items)
6. Erosion -Chemical wear process due to acidic environment
-Exogenous: acidic food
-Endogenous: eating disorders (bulimia), gastroesophageal reflux disease
(GERD), alcohol abuse
-Smooth, shallow, hard, shiny (in contrast to dental caries, in which
appearance is soft and discolored)
-May occur in combination with dental caries, calculus, or dental restorations
,7. Root caries A soft, progressive lesion of cementum and dentin that involves bacterial
infection, tends to be shallow and spread laterally. Tooth needs to
present with recession.
, DHYG 312 FINAL
Initial a clearly demarcated discoloration (light/ dark brown or
lesion black) below the cemen-
toenamel junction with no cavitation.
Moderate/ Exten- discolored area on the root surface with
cavitation. May have a leathery texture.
sive Lesion
10. Risk Factors age, history of root caries, # of teeth present, poor oral biofilm removal
11. carious lesion microorganisms, fermentable carbohydrate, and a susceptible tooth surface.
12. primary Streptococcus mutans and lactobacillus
dental caries
(original
caries)
13. Recurrent carries under restorations
14. G. V. Black's Used for carious lesions, cavity preparations and finished restorations
clas-sification
15. G. V.
Black's
classifica-tion
(CHART)
16. Occlusion Static occlusal relationships. The maximum intercuspation or contact of the
teeth of the opposing arches
17. Malocclusion Any deviation from the physiologically acceptable relationship of the
maxillary arch and/or teeth to the mandibular arch and/or teeth
18. Mesognathic Class I, normal occlusion
2026/2027
1. Primary
-Formation of the primary teeth begins in utero
denti-tion
-Average age after birth when the enamel is completely formed before
the date of eruption
2. Mixed or
-Occurs b/w 6 and 12 years when primary teeth are being
Transi-tional
exfoliated and permanent teeth erupt
Dentition
-Succedaneous teeth are permanent teeth that erupt into the position
of exfoli-ated primary teeth
-32 teeth that replace the primary teeth and serve throughout life.
3. Permanent
-Roots are completely formed about 3 years after eruption into the oral
Den-tition cavity
-Table 16-1 Tooth development and Eruption: permanent teeth
4. Attrition -Mechanical wear due to tooth to tooth contact, bruxism
-More attrition is seen in men than women, often associated with increasing age
-Facet: small shiny, flat, worn spot on the surface of a tooth
-gradual reduction in cusp height; flattening of incisal or occlusal plane
-Staining exposed dentin
5. Abrasion -Mechanical wear due to foreign objects: stittness of toothbrush bristles
-Risk: pipe smoking, chewing pens, betel nut chewing, and pica (eating nonfood
items)
6. Erosion -Chemical wear process due to acidic environment
-Exogenous: acidic food
-Endogenous: eating disorders (bulimia), gastroesophageal reflux disease
(GERD), alcohol abuse
-Smooth, shallow, hard, shiny (in contrast to dental caries, in which
appearance is soft and discolored)
-May occur in combination with dental caries, calculus, or dental restorations
,7. Root caries A soft, progressive lesion of cementum and dentin that involves bacterial
infection, tends to be shallow and spread laterally. Tooth needs to
present with recession.
, DHYG 312 FINAL
Initial a clearly demarcated discoloration (light/ dark brown or
lesion black) below the cemen-
toenamel junction with no cavitation.
Moderate/ Exten- discolored area on the root surface with
cavitation. May have a leathery texture.
sive Lesion
10. Risk Factors age, history of root caries, # of teeth present, poor oral biofilm removal
11. carious lesion microorganisms, fermentable carbohydrate, and a susceptible tooth surface.
12. primary Streptococcus mutans and lactobacillus
dental caries
(original
caries)
13. Recurrent carries under restorations
14. G. V. Black's Used for carious lesions, cavity preparations and finished restorations
clas-sification
15. G. V.
Black's
classifica-tion
(CHART)
16. Occlusion Static occlusal relationships. The maximum intercuspation or contact of the
teeth of the opposing arches
17. Malocclusion Any deviation from the physiologically acceptable relationship of the
maxillary arch and/or teeth to the mandibular arch and/or teeth
18. Mesognathic Class I, normal occlusion
