An accurate method of predicting mandibular growth potential based on bone maturity

Area of Science:

• Orthodontics and Dental Development
• Cephalometric Analysis
• Skeletal Maturity Assessment

Background:

• Accurate prediction of mandibular growth is essential for effective orthodontic treatment planning and assessing post-treatment occlusal stability.
• Current methods for predicting mandibular growth vary in accuracy, necessitating a comparative analysis.

Purpose of the Study:

• To compare the predictive accuracy of various methods for mandibular growth using skeletal maturity indicators.
• To identify the most reliable method for predicting final mandibular length (condylion-gnathion).

Main Methods:

• Longitudinal cephalometric and hand-wrist radiographs from 44 female subjects were analyzed.
• Mandibular growth was predicted using ossification events, growth potential, growth percentage, multiple regression, and growth chart methods.
• Bone age was assessed using Tanner-Whitehouse 2 (TW2) and a developed computer-aided skeletal maturity assessment system (CASMAS).

Main Results:

• The growth potential method showed average errors of 2.1 mm (TW2) and 2.4 mm (CASMAS).
• The growth percentage method yielded average errors of 2.3 mm (TW2) and 2.6 mm (CASMAS).
• Multiple regression and growth chart methods demonstrated higher average errors, ranging from 3.6 mm to 4.9 mm.

Conclusions:

• The growth potential and growth percentage methods are the most accurate predictors of mandibular growth.
• These methods, utilizing skeletal maturity indicators, provide reliable estimations for clinical applications in orthodontics.