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Questions and Answers
Which of the following is NOT a difference between primary dentition and permanent dentition?
Which of the following is NOT a difference between primary dentition and permanent dentition?
- Development time
- Number of teeth
- Thickness of dentin and enamel (correct)
- Root canal morphology
Which of the following is true about restorative preparations for primary teeth?
Which of the following is true about restorative preparations for primary teeth?
- They rarely involve pulpal tissues
- They are similar to those for permanent teeth
- They always require extraction of the affected tooth
- They often involve pulpal tissues (correct)
In which regions of primary molars are variations in canal systems the greatest?
In which regions of primary molars are variations in canal systems the greatest?
- Apical regions of distal roots of mandibular molars
- Apical regions of mesial roots of mandibular molars (correct)
- Apical regions of distal roots of maxillary molars
- Apical regions of mesiobuccal roots of maxillary molars
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Study Notes
- Primary dentition differs from permanent dentition in many ways
- Differences include development time, number of teeth, external and root canal morphology, and anomalies
- Primary teeth are smaller and have thinner dentin and enamel, with larger pulp horns
- Restorative preparations for primary teeth often involve pulpal tissues
- Few studies have been done on root canal morphology of primary teeth
- Variations in canal systems are greatest in apical regions of mesial roots of mandibular molars and mesiobuccal roots of maxillary molars
- Each primary tooth normally exfoliates as a succedaneous tooth takes its place
- Face size is smaller, leading to less overall tooth structure
- Mandibular anterior teeth are especially difficult to restore
- Hibbard & Ireland conducted a study on internal root canal systems of primary molars.
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