Effects of early unilateral first molar extraction on skeletal asymmetry

Introduction: The purpose of this study was to investigate dental and skeletal asymmetry in patients who had unilateral first molar extractions. Methods: Two study groups were formed according to the location of the extracted first molars. Group I included 25 subjects who had a maxillary permanent first molar extracted (mean age, 18.25 years). Group II included 26 subjects who had a mandibular permanent first molar extracted (mean age, 17.75 years). The control group included 30 subjects with no missing teeth and normal occlusion (mean age, 18.50 years). Dental and skeletal asymmetry values were computed on posteroanterior radiographs for all subjects. Data were analyzed statistically with paired t tests to determine intragroup differences and with ANOVA and Scheffé tests to determine intergroup differences. Results: Unilateral first molar extractions caused dental midline deviations in both arches, but this was more prominent in the mandibular arch. Unilateral first molar extraction during growth and development can result in remarkable skeletal asymmetry, especially in the lower third of face. Conclusions: Patients who had early unilateral first molar extraction can have skeletal and dental asymmetries.