Root curvature: differences among dental morphotypes and modifications after mechanical instrumentation.

Area of Science:

• Dental Morphology
• Biomechanical Analysis
• Periodontal Instrumentation

Background:

• Root curvature measurement is crucial for dental procedures.
• Existing methods may lack precision or comprehensive analysis.
• Understanding root morphology variations is key to effective treatment.

Purpose of the Study:

• To introduce a novel, accurate method for quantifying root curvature in extracted teeth.
• To compare the root curvature of four maxillary dental morphotypes before instrumentation.
• To assess root curvature changes following mechanical instrumentation procedures.

Main Methods:

• A digital scanning technique was employed on 55 maxillary teeth (incisors, canines, premolars).
• Measurements of radius, arc, and arrow were taken to define root curvature and morphology.
• Statistical analyses (ANOVA, Tukey test) were used to compare morphotypes and assess treatment effects.

Main Results:

• Significant differences in root curvature were found among central incisors, canines, lateral incisors, and premolars.
• Lateral incisors and premolars exhibited similar root curvature.
• Mechanical instrumentation, particularly vigorous root planing, reduced mesio-distal dimension and slightly flattened root surfaces without altering curvature.

Conclusions:

• The developed digital scanning method is accurate and reliable for measuring root curvature.
• Distinct root curvature patterns exist across different dental morphotypes.
• While root planing affects root dimensions and surface, it does not significantly alter the inherent root curvature.