Faculty of Dentistry, University of Padova, via Giustiniani 2 -, 35100, Padova, Italy.
Department of Geoscience, University of Padova, Padova, Italy.
BMC Oral Health. 2020 May 14;20(1):142. doi: 10.1186/s12903-020-01132-4.
The study aimed to evaluate the permanence of resin and enamel remains on lingual brackets at the end of orthodontic treatment and after the debonding procedure. The evaluation of resin remnants on customized lingual brackets bases has never done before in other studies because they are curved, and traditional techniques are not applicable.
The sample consisted of 100 lingual brackets (25 incisors, 25 canines, 25 premolars, 25 molars) scanned with a confocal laser microscope (OLS4000). We measured the brackets' surface and the area of resin remnants with the software of the microscope. Median and quartiles were presented to describe the data. ARI calculation was indirect for each tooth, measuring the resin remnants to the total surface of the bracket. The Kruskal-Wallis test and Fisher test were applied respectively to compare the percentages of remnants and the frequencies of the ARI between the four groups.
After the analyses, 13 brackets had no adhesive remnants (ARI 0), 29 brackets had less than 50% of resin remnants (ARI 1), 50 brackets had more than 50% of resin remnants (ARI 2), and 8 brackets had 100% of adhesive (ARI 3). Canines brackets presented the lower amount of resin followed by premolars, incisors, and molars.
Lingual brackets showed a high frequency of ARI = 2. The median percentage of the bracket surface covered by resin was 41%. We observed a slight tendency of more resin remnants on molar brackets, due to half-pad configuration. The authors suggest paying attention during the debonding procedure of molar brackets since a stronger connection between the adhesive and the bracket mesh means a higher risk of enamel damage.
本研究旨在评估正畸治疗结束和去带后舌侧托槽上残留树脂和牙釉质的持久性。由于舌侧托槽基底是弯曲的，传统技术不适用，因此之前从未在其他研究中评估过定制舌侧托槽基底上的树脂残留情况。
本研究使用共聚焦激光显微镜（OLS4000）对 100 个舌侧托槽（25 个切牙、25 个尖牙、25 个前磨牙、25 个磨牙）进行扫描。我们使用显微镜软件测量托槽表面和残留树脂的面积。中位数和四分位数用于描述数据。为了对每个牙齿进行间接 ARI 计算，将树脂残留量与托槽的总表面积进行比较。分别应用 Kruskal-Wallis 检验和 Fisher 检验比较四组之间的残留百分比和 ARI 频率。
经过分析，有 13 个托槽没有残留胶（ARI = 0），29 个托槽的残留树脂少于 50%（ARI = 1），50 个托槽的残留树脂超过 50%（ARI = 2），8 个托槽的残留树脂达到 100%（ARI = 3）。尖牙托槽的残留树脂量最低，其次是前磨牙、切牙和磨牙。
舌侧托槽的 ARI = 2 频率较高。残留树脂覆盖托槽表面的中位数百分比为 41%。我们观察到磨牙托槽上的残留树脂略多，这可能是由于半翼片的配置所致。作者建议在去带处理磨牙托槽时要格外注意，因为胶与托槽网之间的连接越强，牙釉质损伤的风险就越高。
