A Computed Tomographic Comparative Evaluation of External Apical Root Resorption in Post-retraction and Space Closure phases with Self‑Ligating Brackets: A Retrospective Clinical Study

OBJECTIVE: A computed tomographic comparison of external apical root resorption (EARR) from pretraction to postretraction and space closure with sliding mechanics, a retrospective clinical study comparing 0.022 and 0.018 self ligating MBT bracket systems.

MATERIALS AND METHODS: Retrospectively 28 patients were divided into 2 groups of 14 each based on bracket slot size. Group I: Self ligating (0.022” slot), mean age 19.14 ± 2.12 years; Group II : Self ligating (0.018” slot), mean age 19.71 ± 1.80 years. Computed tomographic records were collected at two intervals of time. T1: Preretraction & T2: Postretraction and space closure. The preretraction and post space closure computed tomography scans were evaluated for the assessment of external apical root resorption. For the intergroup comparison of difference of mean scores between two distinct groups, independent t test was used to analyse the data using SPSS Statistical software 19.0 Version.

RESULTS: There was no statistical difference between the groups from T1 – T2 in terms of EARR in either of arches. In both groups, maxillary teeth showed greater apical root resorption than mandibular teeth with maxillary lateral incisors revealing the highest.

CONCLUSION: No statistically significant difference in EARR between 022 & 018 self ligating MBT bracket systems was found from preretraction to postretraction and space closure.

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