Intermaxillary tooth size discrepancies among different malocclusion classes: a comparative study.

Area of Science:

• Dentistry
• Orthodontics
• Anthropology

Background:

• Tooth size discrepancies can impact orthodontic treatment outcomes.
• Assessing intermaxillary tooth proportions is essential for diagnosis and treatment planning.
• Previous research has established norms for tooth size ratios, such as the Bolton analysis.

Purpose of the Study:

• To investigate intermaxillary tooth size differences in Saudi patients with various malocclusions.
• To compare tooth size ratios between different malocclusion classes and normal occlusion.
• To evaluate the applicability of Bolton analysis in the studied population.

Main Methods:

• Analysis of 240 pretreatment orthodontic casts from Saudi patients.
• Categorization into Class I, Class II, Class III malocclusions, and normal occlusion groups (60 cases each).
• Calculation of overall and anterior tooth size ratios using Bolton analysis.

Main Results:

• No significant differences in overall or anterior tooth size ratios were found between most malocclusion groups.
• A significant difference in the anterior ratio was observed specifically in Class III malocclusion.
• No statistically significant gender-based differences in tooth size ratios were detected.
• Significant differences were noted when comparing the study's mean values to established Bolton standards across all malocclusion classes.

Conclusions:

• Bolton tooth size analysis is a valuable diagnostic tool in orthodontics.
• Tooth size discrepancies, particularly anterior ratios in Class III, warrant consideration in Saudi patients.
• The findings underscore the importance of incorporating Bolton analysis prior to initiating orthodontic treatment.