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Evaluation of apical root resorption in Orthodontic Patients Treated with Extraction and Non-Extraction Therapy

Evaluation of Apical Root Resorption in Orthodontic Patients...

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作者： Boodhoo Kiran Devi 重庆医科大学

学位级别：硕士

Objective: The purpose of this retrospective study was to comparatively assess the severity of apical root resorption in patients treated with second premolar extraction and non-extraction treatment protocols. A further aim was to evaluate the effect of treatment duration on the degree of apical root resorption.Methods: The sample consisted of 596 teeth in 50 patients (41 females, 9 males) aged 12-22 years, with different malocclusions. The non-extraction group included 20 patients, with an initial mean age of 15.10±3.04 years and the extraction group comprised 30 patients treated with second premolar extractions, with an initial mean age of 15.07±3.08 years. Chi-square and two-sample t-tests were performed to ascertain similarity of the 2 groups. The groups were well matched in relation to initial age, sex, malocclusion types, overjet and overbite. apical root resorption in all tooth groups, except maxillary first premolar, maxillary and mandibular second premolars and second molars, was evaluated from pre- and post treatment panoramic radiographs. The intergroup differences were analyzed with the Student’s t-test and the correlation between the degree of root resorption and treatment time was investigated with the Pearson correlation coefficient.Results: The second premolar extraction group showed significantly greater apical root resorption than the non-extraction group for the maxillary and mandibular central incisors, lateral incisors and 1st molars (Papical root resorption. Mandibular 1st premolars of the extraction group demonstrated significantly greater root resorption than the corresponding teeth of the non-extraction group (P=0.01). Negative values indicating root elongation was seen in some of the tooth groups.Even though duration of treatment was longer in the extraction group, it was not found to be correlated with the amount of r

关键词： apical root resorption second premolar extraction fixed appliances

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