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Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
Published on: February 23, 2024
Evaluation of tooth size discrepancy in different malocclusion groups.
Iffat Batool1, Assad Abbas, S Ausaf Ali Rizvi
1Department of Orthodontics, Armed Forces Institute of Dentistry, Rawalpindi, Pakistan.
Journal of Ayub Medical College, Abbottabad : JAMC
|December 17, 2009
Summary
Skeletal Class II patients exhibit larger tooth sizes in the lower front, potentially impacting ideal occlusion. This study analyzed tooth-size discrepancies using Bolton ratios in orthodontic patients.
Area of Science:
- Dentistry
- Orthodontics
- Dental Morphology
Background:
- Accurate orthodontic diagnosis relies on comprehensive patient history, examinations, and diagnostic records.
- Tooth-size analysis, specifically the Bolton ratio, is crucial for assessing proportionality between maxillary and mandibular teeth for ideal occlusion.
- The Bolton analysis provides established norms for anterior (77.2%) and overall (91.3%) tooth-size ratios.
Purpose of the Study:
- To investigate tooth-size discrepancies in orthodontic patients.
- To evaluate Bolton ratios in relation to skeletal classifications, particularly Class II malocclusions.
- To determine if specific tooth-size patterns are associated with Class II skeletal relationships.
Main Methods:
- A quantitative, cross-sectional study was conducted using 135 patient study casts from an orthodontic treatment cohort.
- Mesiodistal tooth widths were measured using manual calipers, and Bolton ratios (anterior and total) were calculated.
- Lateral cephalograms were analyzed for ANB angle and Witt's appraisal to determine skeletal classifications.
Main Results:
- A statistically significant increase in mean anterior tooth ratios was observed in patients with Class II malocclusions (p < 0.01).
- Overall Bolton ratios for the entire arch were generally consistent with established norms across different patient groups.
- No significant deviations from Bolton's norms were noted for other tooth-size ratios beyond the anterior segment in Class II patients.
Conclusions:
- Skeletal Class II patients demonstrate a tendency towards increased mesiodistal tooth widths in the mandibular anterior region.
- This finding suggests a potential link between skeletal Class II malocclusion and specific tooth-size characteristics.
- Further research may explore the clinical implications of these tooth-size tendencies in Class II orthodontic treatment planning.
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