Crown-Root Ratio as a Predictive Morphometric Indicator in Mandibular First Molars with Occlusal Trauma and...

Area of Science:

• Dentistry
• Periodontology
• Dental Morphology

Background:

• Trauma from occlusion (TFO) influences periodontal disease progression.
• The morphometric impact of TFO on mandibular molars is not well understood.
• Crown-root ratio (CRR) may indicate structural changes in periodontally compromised teeth.

Purpose of the Study:

• To evaluate the relationship between crown/root dimensions and clinical/radiographic parameters in mandibular first molars with TFO.
• To develop predictive models for crown and root lengths using CRR.
• To emphasize the diagnostic role of CRR in TFO-affected teeth.

Main Methods:

• Retrospective cross-sectional study of 99 periodontitis patients with TFO.
• Analysis of digitized periapical radiographs of mandibular first molars.
• Measurement of clinical/radiographic CRR, crown/root length, tooth inclination, bone loss, and root morphology.
• Correlation and stepwise multiple regression analyses.

Main Results:

• Males exhibited significantly greater crown length, root length, and radiographic CRR.
• Clinical CRR positively correlated with crown length and inversely with root length.
• Clinical CRR, root length, and sex predicted crown length (R² = 0.955).
• CRR and crown length predicted root length (R² = 0.958).

Conclusions:

• Clinical CRR is a robust predictor of crown and root lengths in mandibular first molars with TFO.
• CRR serves as a valuable diagnostic marker for structural changes in periodontitis.
• Understanding these morphometric relationships aids in managing TFO-related periodontal issues.