Department of Orthodontics, School of Dental Medicine, Bahçeşehir University, Istanbul, Turkey.
Private Practice, Istanbul, Turkey.
J Stomatol Oral Maxillofac Surg. 2023 Dec;124(6):101481. doi: 10.1016/j.jormas.2023.101481. Epub 2023 Apr 19.
The aims of this study were to measure and compare shear bond strength (SBS) and manipulation time (MT) among five different composite resins (CR; two flowable and three highly viscous) which are used in the production of clear aligner attachments.
This in vitro experiment study comprised of 150 extracted premolars which were divided into 5 equal groups. Predictor variables were CRs; Tetric Evo Ceram (Ivoclar VivadentAG, Liechtenstein) (Group 1), Tetric NCeram; (Ivoclar VivadentAG, Liechtenstein) (Group 2), Tetric N-Flow (GC Dental Products, Tokyo, Japan) (Group 3), G-aenial Universal Injectable (GC Dental Products, Tokyo, Japan) (Group 4), GC Aligner Connect (GC Dental Products, Tokyo, Japan) (Group 5), respectively. Outcome variables were; SBS and MT for each CR attachment in each group of teeth. Oneway ANOVA was used to compare the groups. Levene's test was used to determine variance homogeneity. In terms of variance homogeneity, Bonferroni tests were used as a post-hoc test for multiple group comparisons.
SBS was statistically different between study groups (p < 0.001). Average SBS values are found to be 16.6 ± 3.6 MPa for Tetric Evo Ceram; 20.7 ± 5.4 MPa for Tetric NCeram; 21.0 ± 4.0 MPa for Tetric N-Flow; 18.9 ± 5.0 MPa for G-aenial Universal Injectable; and 17.4 ± 3.5 MPa for GC Aligner Connect. The values in the Tetric Evo Ceram group were significantly lower than the Tetric N-Ceram group (p = 0.004) and the Tetric N-Flow group (p = 0.001). Mean value of shear bond strength in the GC Aligner connect group were significantly lower than in the Tetric N-Ceram group (p = 0.047) and in the Tetric N-Flow group (p = 0.017). Flowable composite had a significantly shorter manipulation time than the high viscous one; mean 1,08 ± 0,22 min to mean 4,57 ± 0,51 min, respectively.
Although SBSs of CRs tested in the study was found to be statistically different, they all quite exceeded the accepted clinically sufficient value of 6-8 MPa. Besides, flowable composite required substantially less time to manipulate than the high viscosity composite.
本研究的目的是测量和比较用于制作透明矫正器附件的五种不同复合树脂（两种流动性和三种高粘度）的剪切结合强度（SBS）和操作时间（MT）。
本体外实验研究包括 150 颗离体前磨牙，分为 5 组。预测变量为复合树脂；依科乐（义获嘉伟瓦登特）的 Tetric Evo Ceram（组 1）、依科乐（义获嘉伟瓦登特）的 Tetric NCeram（组 2）、GC 牙科产品的 Tetric N-Flow（组 3）、GC 牙科产品的 G-aenial Universal Injectable（组 4）和 GC 牙科产品的 GC Aligner Connect（组 5）。每个复合树脂附件的 SBS 和 MT 为每个组的牙齿的结果变量。采用单因素方差分析比较各组。采用莱文检验确定方差同质性。在方差同质的情况下，采用 Bonferroni 检验作为多组比较的事后检验。
研究组间 SBS 差异具有统计学意义（p<0.001）。Tetric Evo Ceram 的平均 SBS 值为 16.6±3.6MPa；Tetric NCeram 为 20.7±5.4MPa；Tetric N-Flow 为 21.0±4.0MPa；G-aenial Universal Injectable 为 18.9±5.0MPa；GC Aligner Connect 为 17.4±3.5MPa。Tetric Evo Ceram 组的数值明显低于 Tetric N-Ceram 组（p=0.004）和 Tetric N-Flow 组（p=0.001）。GC Aligner Connect 组的剪切结合强度平均值明显低于 Tetric N-Ceram 组（p=0.047）和 Tetric N-Flow 组（p=0.017）。与高粘度型相比，流动性复合树脂的操作时间明显缩短，分别为 1.08±0.22 分钟和 4.57±0.51 分钟。
尽管研究中测试的复合树脂的 SBS 差异具有统计学意义，但均明显超过了 6-8MPa 的临床可接受的最低值。此外，流动性复合树脂的操作时间明显短于高粘度复合树脂。
