Debonding Characteristic and Survival Probability of Adhesive Flash-Free Ceramic Orthodontic Brackets Following pH Cycling.

Q1 Dentistry
Tarek Ahmed Soliman, Ali Robaian, Nasser Raqe Alqhtani, Abdullah Alshehri, Abdullah Saad Alqahtahni, Ibrahim Saleh Aljulayfi, Magdy Alazzazi, Ali Elkaffas, Shahad Saleh AlGhannam, Sayed Ghorab
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Abstract

Objectives:  Orthodontic bracket bond failure is an obstacle in clinical orthodontics. This study investigated the influence of pH cycling on the shear bond strength (SBS), adhesive remnant index (ARI), and survival probability of adhesive-precoated flash-free ceramic brackets.

Materials and methods:  Forty mandibular premolars were randomly divided into two groups (n = 20): C: noncoated orthodontic brackets, and F: flash-free adhesive-precoated orthodontic brackets. Each group was subdivided into two subgroups according to storage medium solutions (n = 10): in subgroup AS, specimens were immersed in artificial saliva for 24 hours, and in Subgroup ASL, specimens were recycled between a demineralizing solution and an artificial saliva for 42 days. Within each subgroup, specimens were subjected to SBS and ARI testing. SBS data were analyzed using one-way ANOVA (analysis of variance) and Tukey's post-hoc test. Weibull analysis was performed on the SBS data to determine the characteristic SBS and their survival probabilities.

Results:  Flash-free adhesive-precoated brackets had higher significant (p < 0.001) SBS values in both the AS group (17.74 ± 1.74 MPa) and the ASL group (12.61 ± 1.40 MPa) compared with the noncoated bracket (10.67 ± 1.55 and 7.89 ± 1.39 MPa, respectively). The ARI scores for the noncoated brackets in the AS group were 70% occurrence for score 1, while 90% for score 1 in the ASL group. For the flash-free precoated brackets, ARI scores were 70% occurrence for score 2 in the AS group, while 80% for score 2 in the ASL group. Flash-free brackets had higher SBS in both AS and ASL groups (14.07 and 9.76 MPa, respectively), at 95% survival probability.

Conclusion:  Flash-free orthodontic brackets performed better in terms of significantly higher bond strength and higher ARI scores. Meanwhile, noncoated brackets revealed acceptable SBS results in both storage medium groups. Flash-free brackets showed higher survival than the noncoated brackets in both storage medium groups at 90% survival probability.

pH循环后粘接无闪陶瓷正畸托槽的脱粘特性及存活概率。
目的:正畸托槽粘结失败是临床上正畸治疗的一大障碍。研究了pH循环对预涂无闪蒸陶瓷支架剪切粘结强度(SBS)、胶粘剂残留指数(ARI)和存活概率的影响。材料与方法:40颗下颌前磨牙随机分为两组(n = 20): C组为无涂层正畸托槽,F组为无闪胶预涂层正畸托槽。每组按保存介质溶液再分为2个亚组(n = 10): AS亚组在人工唾液中浸泡24 h, ASL亚组在脱矿液和人工唾液中循环42 d。在每个亚组中,标本进行SBS和ARI测试。SBS数据采用单因素方差分析和Tukey事后检验进行分析。对SBS数据进行威布尔分析,以确定特征SBS及其生存概率。结果:无闪牙胶粘剂预涂托槽具有较高的显著性(p)。结论:无闪牙托槽具有较高的粘结强度和较高的ARI评分。同时,非涂层支架在两种存储介质组中显示出可接受的SBS结果。在两种存储介质组中,无闪光支架的存活率均高于无涂层支架,存活率均为90%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
European Journal of Dentistry
European Journal of Dentistry Dentistry-Dentistry (all)
CiteScore
5.10
自引率
0.00%
发文量
161
期刊介绍: The European Journal of Dentistry is the official journal of the Dental Investigations Society, based in Turkey. It is a double-blinded peer-reviewed, Open Access, multi-disciplinary international journal addressing various aspects of dentistry. The journal''s board consists of eminent investigators in dentistry from across the globe and presents an ideal international composition. The journal encourages its authors to submit original investigations, reviews, and reports addressing various divisions of dentistry including oral pathology, prosthodontics, endodontics, orthodontics etc. It is available both online and in print.
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