Postgraduate Program of Biophotonics Applied to Health Sciences, Nove de Julho University (UNINOVE), São Paulo, Brazil.
School of Dentistry, Nove de Julho University (UNINOVE), São Paulo, Brazil.
Photobiomodul Photomed Laser Surg. 2022 Dec;40(12):818-825. doi: 10.1089/photob.2021.0133.
to evaluate the bond strength of repairs to composite resin restorations treated with CO laser and bifunctional monomers after 1 year of aging. Adequate bond strength between a composite restoration and resin repair agent can be achieved through mechanical and/or chemical treatment. However, the longevity of such repairs is unknown. Resin blocks (volume: 125 mm) were created. Failure surfaces were either not treated or were treated before the repair with a universal adhesive, a silane bonding agent and/or CO laser. The blocks were distributed into six groups ( = 6 per group): resin+resin group (RRG), universal adhesive+resin group (ARG), silane+universal adhesive group (SAG), laser+silane+universal adhesive group (LSAG), laser+universal adhesive group (LAG), and laser+silane group (LSG). After treatment, repairs were made with another resin composite. "Sticks" (1.0 mm in area and 1.0 cm in length) were cut from the specimens in each group and immersed in distilled water at 37°C. Microtensile bond strength was evaluated after 1 year of aging. Bond strength values were compared using the Kruskal-Wallis test and Dunn's test. Bond strength was significantly higher in the LSAG compared with the RRG, adhesive system, LSG, whereas statistically similar results were found for the SAG, LSAG, and LAG. Bond strength was lowest in the RRG. The LSAG and LAG presented predominantly cohesive fractures. The bond strength of composite resin repairs was satisfactory over time. Treatment with CO laser contributed to the maintenance of bond strength during the 1-year storage period and bifunctional monomers present in the universal adhesive on the irradiated repair surface were of fundamental importance to the maintenance of bond strength values, as demonstrated by microtensile bond test and fracture pattern analysis.
评估经 CO 激光和双功能单体处理后的复合树脂修复体在 1 年老化后的粘结强度。通过机械和/或化学处理，可以在复合修复体和树脂修复剂之间获得足够的粘结强度。然而，这种修复的耐久性尚不清楚。制备树脂块（体积：125mm）。在修复前，根据粘结系统的不同，对失效面进行了不同的处理，包括通用粘结剂、硅烷偶联剂和/或 CO 激光处理。将块体分为六组（每组 6 个）：树脂+树脂组（RRG）、通用粘结剂+树脂组（ARG）、硅烷+通用粘结剂组（SAG）、激光+硅烷+通用粘结剂组（LSAG）、激光+通用粘结剂组（LAG）和激光+硅烷组（LSG）。处理后，用另一种树脂复合材料进行修复。从每组标本中切下（1.0mm 面积，1.0cm 长）的“棒”，并将其浸泡在 37°C 的蒸馏水中。1 年后老化，评估微拉伸粘结强度。使用 Kruskal-Wallis 检验和 Dunn 检验比较粘结强度值。LSAG 组的粘结强度明显高于 RRG 组、粘结系统组、LSG 组，而 SAG 组、LSAG 组和 LAG 组的结果则统计学上相似。RRG 组的粘结强度最低。LSAG 和 LAG 组表现出主要的内聚性断裂。随着时间的推移，复合树脂修复体的粘结强度保持满意。CO 激光的处理有助于在 1 年储存期内保持粘结强度，而通用粘结剂中存在的双功能单体对维持粘结强度值至关重要，这可以通过微拉伸粘结试验和断裂模式分析得到证明。
