Souza Marcela Oliveira de, Leitune Vicente Castelo Branco, Rodrigues Stéfani Becker, Samuel Susana Maria Werner, Collares Fabrício Mezzomo
Universidade Federal do Rio Grande do Sul, School of Dentistry, Dental Materials Laboratory, Porto Alegre, RS, Brazil.
Braz Oral Res. 2017 Jan 5;31:e4. doi: 10.1590/1807-3107BOR-2017.vol31.0004.
The present study aimed to evaluate effects of different surface treatments and aging of composite cylinders on bond strength of composite resin repair. Thirty-two composite cylinders were produced and divided into four groups according to type of surface treatment and storage time of composite cylinder and repair. Cylinder surface of control group (Gcontrol) received no treatment before composite repair. Other groups were sandblasted with aluminum oxide (GAl2O3), followed by silane (GAl2O3sil) or adhesive (GAl2O3ad). Composite cylinders were stored in artificial saliva for either 24 hours or 1 year. Repairs were performed and stored in artificial saliva for 24 hours or 1 year and repair strength was evaluated using microtensile bond strength test. Data were submitted to Student's t test, two-way ANOVA, and post hoc test for storage time and treatment (α = 0.05). Gcontrol group showed lower values of aging of composite cylinder and storage time of repair (24 hours or 1 year for both) compared with other groups (p < 0.05). GAl2O3ad and GAl2O3sil groups did not exhibit decreased microtensile bond strength with aged repairs (1 year; p > 0.05). Polymer degradation was significant for composite cylinders during the first year of storage in Gcontrol, GAl2O3, and GAl2O3ad groups (p < 0.05). In GAl2O3sil group, storage time of composite cylinders was not significant (p > 0.05). Aging of composite resin influenced bond strength of restoration repair for up to 1 year. Sandblasting with Al2O3, followed by application of silane layer, produced high bond strength after composite or repair aging.
本研究旨在评估复合圆柱体的不同表面处理和老化对复合树脂修复粘结强度的影响。制备了32个复合圆柱体，并根据复合圆柱体的表面处理类型以及修复的储存时间分为四组。对照组（Gcontrol）的圆柱体表面在复合修复前未进行处理。其他组先用氧化铝喷砂（GAl2O3），然后涂硅烷（GAl2O3sil）或粘结剂（GAl2O3ad）。复合圆柱体在人工唾液中储存24小时或1年。进行修复并在人工唾液中储存24小时或1年，然后使用微拉伸粘结强度测试评估修复强度。数据采用学生t检验、双向方差分析以及储存时间和处理的事后检验（α = 0.05）。与其他组相比，Gcontrol组的复合圆柱体老化程度和修复储存时间（两者均为24小时或1年）较低（p < 0.05）。GAl2O3ad组和GAl2O3sil组在老化修复（1年）时未表现出微拉伸粘结强度降低（p > 0.05）。在Gcontrol组、GAl2O3组和GAl2O3ad组中，复合圆柱体在储存的第一年聚合物降解显著（p < 0.05）。在GAl2O3sil组中，复合圆柱体的储存时间不显著（p > 0.05）。复合树脂的老化在长达1年的时间内影响修复体修复的粘结强度。用Al2O3喷砂，然后涂覆硅烷层，在复合或修复老化后产生高粘结强度。
