The influence of bracket type on the external apical root resorption in class I extraction patients - a retrospective study

Fang Qin,Yu Zhou

doi:10.1186/s12903-019-0743-3

Abstract

BackgroundThe relationship between orthodontic treatment-related factors and EARR has never been fully answered. The aim of this study was to investigate whether conventional and passive self-ligating brackets affect the amount and severity of external apical root resorption (EARR) in withdrawal patients.MethodsNinety-eight patients were selected from department of orthodontic, hospital of stamotology, Wenzhou medical university. Patients received treatment with either a conventional edgewise appliance (n = 49, Mini, 3 M Unitek, USA) or a passive self-ligating bracket system (n = 49, Damon, Ormco, USA). EARR of the maxillary incisors was evaluated on panoramic radiographs at the before and end of orthodontic treatment, respectively. Intergroup comparisons of root resorption were performed with Mann-Whitney tests. The univariate and multivariate regression model was used to assess the appliance type, age, sex and duration of treatment on EARR.ResultsThere was no significant difference in the amount of EARR between the two groups was found. Age and gender were not association with EARR, however, EARR was positively correlated with treatment duration.ConclusionsThe type of bracket did not influence the occurrence and severity of the external apical root resorption in class I extraction patients.

Highlights

The relationship between orthodontic treatment-related factors and external apical root resorption (EARR) has never been fully answered
External apical root resorption (EARR) which defined as shortening or blunting of the root apex is considered as one of most serious adverse effect in orthodontic treatment [1]
Many studies have come to a conclusion that mechanical forces play a key role in the occurrence of EARR during orthodontic treatment [8]

Summary

Introduction

The relationship between orthodontic treatment-related factors and EARR has never been fully answered. The aim of this study was to investigate whether conventional and passive self-ligating brackets affect the amount and severity of external apical root resorption (EARR) in withdrawal patients. External apical root resorption (EARR) which defined as shortening or blunting of the root apex is considered as one of most serious adverse effect in orthodontic treatment [1]. The relationship between orthodontic and EARR has never been fully answered. Many studies have come to a conclusion that mechanical forces play a key role in the occurrence of EARR during orthodontic treatment [8].

Objectives

Methods

Results

Discussion

Conclusion