School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, Republic of Korea.
Department of Conservative Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, Republic of Korea.
Sci Rep. 2022 Dec 15;12(1):21652. doi: 10.1038/s41598-022-26197-9.
This study evaluated the effect of vibration on adaptation of bulk-fill composite resin. A scanning laser doppler vibrometer measured the frequency and amplitude of a vibratory device (COMO; B&L Biotech) used for resin placement and visualized its effect on the resin according to depth. A bulk-fill composite resin (Filtek Bulk Fill; 3M ESPE) was placed in simulated cavities (4 mm diameter, 4 mm depth) by different layering methods (incremental filling with two 2-mm-thick layers vs. bulk filling with a single 4-mm-thick layer). The groups were further divided based on the application of vibration during restoration (no vibration vs. vibration). In addition to the surface void area at the cavity floor, the overall void volume and the void volumes of the bottom, middle, and top thirds were obtained for micro-computed tomography analysis. The frequency and amplitude of the COMO were approximately 149 Hz and between 26 and 51 µm, respectively. When vibration was not applied, incremental filling had a lower void volume in the bottom third of the cavity than did bulk filling (p < 0.05). Vibration applied with a 4-mm-thick bulk fill had no significant effect on the adaptation of composite resin (p > 0.05). In contrast, vibration reduced the amount of void formation in the bottom third of the cavity during incremental filling (p < 0.05). Application of vibration to resin with a 2-mm incremental-layering technique formed a smaller void at the interface between the cavity and resin and within the bulk-fill composite resin.
本研究评估了振动对块状填充型复合树脂适应性的影响。采用扫描激光多普勒测振仪测量了用于树脂放置的振动装置（COMO；B&L Biotech）的频率和振幅，并根据深度观察其对树脂的影响。采用块状填充型复合树脂（Filtek Bulk Fill；3M ESPE），通过不同分层方法（用两个 2mm 厚的层进行增量填充与用单个 4mm 厚的层进行块状填充）将其填入模拟腔（直径 4mm，深度 4mm）。根据修复过程中是否应用振动，将各组进一步分为（无振动与振动）。除了腔底表面空隙面积外，还通过微计算机断层扫描分析获得整体空隙体积和底部、中部和顶部三分之一的空隙体积。COMO 的频率和振幅约为 149Hz 和 26-51μm。当不应用振动时，增量填充在腔底的底部三分之一处的空隙体积低于块状填充（p<0.05）。用 4mm 厚的块状填充施加振动对复合树脂的适应性没有显著影响（p>0.05）。相比之下，振动减少了增量填充过程中腔底三分之一处的空隙形成量（p<0.05）。在 2mm 增量分层技术的树脂中应用振动在腔和树脂之间的界面以及块状填充型复合树脂内形成了较小的空隙。
