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Descriptive classification of variations in primary mandibular first molars.
1Department of Pedodontics, School of Dentistry, China Medical College, 91 Hsueh Shih Road, Taichung, 404 Taiwan.
ASDC Journal of Dentistry for Children
|April 28, 2001
Summary
Primary mandibular first molar morphology varies significantly. Type I coronal outline and four cusps with an oblique transverse ridge (Type I-C) were most common, impacting restorative treatment outcomes.
Area of Science:
- Dentistry
- Dental Morphology
- Pediatric Dentistry
Background:
- Tooth morphology significantly influences restorative treatment success.
- Understanding primary tooth variations is crucial for effective pediatric dental care.
Purpose of the Study:
- To classify the morphological variations of the primary mandibular first molar.
- To analyze coronal outline types (I and II) and cusp alignment patterns (A-F).
Main Methods:
- Descriptive study analyzing primary mandibular first molar morphology.
- Categorization based on coronal outline and cusp alignment.
Main Results:
- Type I coronal outline (86%) was more prevalent than Type II (14%).
- Four cusps were most common (93%), with Type I-C (oblique transverse ridge) being the most frequent combination (60%).
- Variations included three (2%), four (93%), and five (5%) cusps, with specific ridge and cusp patterns identified.
Conclusions:
- Primary mandibular first molar morphology exhibits distinct variations in coronal outline and cusp alignment.
- The prevalent Type I-C morphology provides a baseline for understanding developmental patterns and planning restorative interventions.