Which of the following factors fails to contribute toward arch stability?
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Answer: C. Embrasures
Explanation
Embrasures serve spillway and protective functions rather than actively contributing to dental arch stability. Cusps, root forms, and periodontal fibers provide structural support that maintains the integrity of the arch. Embrasures act as pathways to deflect food away from gingival tissues during chewing instead of stabilizing teeth. Dental arch stability ensures teeth remain properly aligned and functional throughout a person lifetime. Periodontal fibers anchor teeth securely within alveolar bone sockets to withstand daily masticatory forces. Cusps and root morphology distribute biting loads evenly to prevent pathological tooth migration or shifting.
Orthodontic retention protocols are designed to maintain arch stability following active braces treatment. Loss of periodontal support or proximal contact can compromise overall arch stability and cause drifting. Dental clinicians evaluate all stability factors when diagnosing malocclusions and planning corrective treatments. Cusps contribute to arch stability by interlocking opposing teeth to prevent unwanted horizontal shifting. Root forms provide essential bony anchorage that stabilizes teeth against heavy masticatory forces. Periodontal fibers form a resilient suspensory apparatus that actively maintains tooth position in bone.
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Answer: D. Mandibular central incisor
The mandibular central incisor possesses the smallest root overall in humans. Its narrow root dimensions match its status as the smallest tooth. Flattened mesiodistal root surfaces characterize this delicate anterior too...
Q2. Which of the following crowns possesses the greatest faciolingual diameter__________?
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Answer: A. Decidous maxillary 2nd molar
Deciduous maxillary second molars have exceptionally broad crowns faciolingually. This dimension exceeds that of all other primary molar crown types. Such width provides a robust foundation for early masticatory function...
Q3. What represents the correct dental formula for a child aged 9 years_____________?
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Answer: A. 6 EDC21/ 6EDC21
At age nine, the dental formula correctly accounts for erupted permanent incisors and first molars with retained primary teeth. Mixed dentition at nine years old features both permanent first molars and permanent incisor...
Q4. Which statement regarding tooth calcification is considered correct?
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Answer: A. Calcification of primary teeth is almost complete at time of birth
Calcification of primary teeth begins in utero and approaches completion at birth. Hard tissue formation of the crowns is almost finished around the neonatal period. This early mineralization prepares primary teeth for t...
Q5. Which of the mentioned entities features a bifid root?
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Answer: C. 34,44
Permanent mandibular first premolars occasionally present with bifurcated root systems. Teeth 34 and 44 correspond to the mandibular first premolars. Root morphology in these specific teeth can sometimes split into facia...
Q6. Which statement holds true regarding permanent teeth________________?
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Answer: D. All of the above
Permanent teeth exhibit specific alignments: maxillary roots incline distally, mandibular roots incline mesially, and functional cusps match. Arch alignment rules confirm maxillary molars incline buccally while mandibula...