Prediction of transverse maxillary dimension using orthodontic models

Area of Science:

• Orthodontics
• Anthropometry
• Dental Morphology

Background:

• Accurate measurement of transverse maxillary dimensions is crucial in orthodontics.
• Existing methods may have limitations in precision and accessibility.
• Understanding normal occlusion provides a baseline for diagnosing and treating dental discrepancies.

Purpose of the Study:

• To quantify transverse maxillary dimensions in individuals with natural normal occlusion.
• To compare measurements obtained from orthodontic cast models and posteroanterior cephalometric radiographs.
• To develop a predictive formula for transverse maxillary dimensions.

Main Methods:

• Evaluation of 68 pairs of orthodontic models and corresponding posteroanterior cephalographies of adults with normal occlusion.
• Marking of specific points on the alveolar buccal ridge to determine upper and lower interpremolar and intermolar dimensions.
• Statistical analysis to compare measurements from models and radiographs, and to assess intra- and inter-researcher reliability.

Main Results:

• No statistically significant differences were found between measurements from cast models and cephalometric radiographs.
• Established normative values for upper intermolar (57.20 mm), lower intermolar (55.16 mm), upper interpremolar (42.17 mm), and lower interpremolar (39.67 mm) distances.
• Developed predictive formulas: ym = 8.62 + 0.88xm for the molar region and ypm = 4.87 + 0.94xpm for the premolar region.

Conclusions:

• The proposed method using orthodontic models and radiographs is reliable for quantifying transverse maxillary dimensions.
• The developed formulas can accurately predict upper intermolar and interpremolar distances.
• Findings contribute to a better understanding of normal occlusion and aid in orthodontic treatment planning.