A Novel Evaluation Method for Detecting Defects of the Bonded Orthodontic Bracket-Tooth Interface.

Mona Aly Abbassy,Ahmed Samir Bakry,Turki A Bakhsh,Vincenzo Grassia

doi:10.1155/2021/6634595

Mona Aly Abbassy, Ahmed Samir Bakry + Show 2 more

Open Access

https://doi.org/10.1155/2021/6634595

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Abstract

Background Orthodontic patients are at high risk to develop caries. This study is introducing a clinical method detecting interfacial defects between ceramic brackets and enamel utilizing optical coherent tomography in addition to using the nanoleakage expression in vitro test. Methods Transbond XT primer and moisture insensitive primer (MIP) were bonded to 75 human premolar enamel surfaces and divided into (XTD), (MIPD), and (MIPW) groups. The (XTD) and (MIPD) groups had ceramic brackets bonded to dry enamel surfaces using TransBond and moisture insensitive primers, respectively, while the (MIPW) samples were bonded to moist enamel using moisture insensitive primer. All specimens were examined under crosspolarization optical coherence tomography. Debonding forces of the brackets to 45 teeth (15 teeth/group). 30 bonded specimens (15 specimens/group) were cross-sectioned to detect the nanoleakage expression using scanning electron microscope equipped with energy-dispersive spectroscopy (SEM/EDS). The degree of conversion of the specimens in the experimental groups was tested using attenuated total reflectance Fourier transform infrared spectroscopy (FTIR/ATR). Results Optical coherence tomography detected the interfacial defects between the ceramic brackets and tooth structure. One way ANOVA showed that (XTD) and (MIPD) groups recorded significantly higher bond strength values and less nanoleakage expression when compared to MIPW (p > 0.05). Conclusions Optical coherence tomography can be utilized to detect interfacial adhesive-tooth defects. Dry enamel surfaces improve the quality of the enamel/primer interface (200 words).

Highlights

One of the chief goals of orthodontic treatment is to achieve a stable interface between orthodontic brackets and tooth enamel with low susceptibility to degradation over time [1]
It was previously recommended that all measures should be taken to keep the outer enamel surface intact as it contains the highest degree of mineral and mechanical properties to minimize the enamel damage during the bracket debonding phase [1]
The backscatter pattern detected in the MIPD group resembled the results in the XTD group

Summary

Introduction

One of the chief goals of orthodontic treatment is to achieve a stable interface between orthodontic brackets and tooth enamel with low susceptibility to degradation over time [1]. The high rate of bacterial biofilm formation observed in orthodontic patients [2] exposes the bracket-resin-enamel interface to continuous acidic challenge [2]; the proper sealing of the aforementioned interface is an essential element in preventing the ingress of bacterial toxins and acids under the bracket region which may lead to enamel demineralization [3] Such lesions are extremely difficult to be controlled or remineralized because it is located under the bracket region [3]. This study is introducing a clinical method detecting interfacial defects between ceramic brackets and enamel utilizing optical coherent tomography in addition to using the nanoleakage expression in vitro test. Dry enamel surfaces improve the quality of the enamel/primer interface (200 words)

Methods

Results

Conclusion