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Variability in three morphologic features of the permanent maxillary central incisor.
American Journal of Orthodontics
|July 1, 1984
Summary
Tooth morphology, specifically maxillary central incisor variations, impacts orthodontic treatment. Significant differences in crown-root angles were found across malocclusion types, influencing appliance design.
Area of Science:
- Orthodontics
- Dental Anatomy
- Biometrics
Background:
- Tooth morphology significantly influences orthodontic appliance design and treatment outcomes.
- Understanding variations in maxillary central incisor anatomy is crucial for predictable results.
Purpose of the Study:
- To quantitatively assess variations in three key anatomic features of the maxillary central incisor.
- To analyze these variations in relation to different malocclusion classifications.
Main Methods:
- Measurements of crown-root angulation (labiolingual), labial surface angulation, and lingual crown curvature were performed.
- Data were collected from 98 extracted central incisors and 100 cephalometric radiograms representing Angle Class I, II (Div 1 & 2), and III malocclusions.
Main Results:
- A wide range of variation was observed in all three measured features.
- The mean crown-root angle in Class II, Division 2 malocclusions showed a significant difference compared to Class II, Division 1 and Class III malocclusions.
Conclusions:
- Maxillary central incisor morphology exhibits considerable variability.
- These variations, particularly crown-root angulation differences, have implications for orthodontic diagnosis and treatment planning across various malocclusion types.