Sena Lorena Marques Ferreira de, Barbosa Helga Adachi Medeiros, Caldas Sergei Godeiro Fernandes Rabelo, Ozcan Mutlu, Souza Rodrigo Othávio de Assunção E
Universidade Federal do Rio Grande do Norte - UFRN, Department of Dentistry, Natal, RN, Brazil.
University of Zurich, Department of Dental Materials, Zurich, Switzerland.
Braz Oral Res. 2018 Jun 11;32:e58. doi: 10.1590/1807-3107bor-2018.vol32.0058.
The objective of the present study was to evaluate the effect of different surface treatments and polymerization protocols on the bond strength of brackets to enamel, and the degree of conversion of the bonding agents. 120 bovine crowns were embedded in acrylic resin blocks and sanded. Next, the blocks were randomly assigned into 12 groups. Metal brackets were bonded to enamel according to the "surface treatment" factor (A: Phosphoric Acid; ATxt: Phosphoric Acid + Transbond XT Primer®; Tse: Transbond Plus Self Etching Primer®; and SBU: Scotchbond Universal®) and "polymerization" factor (R20: Radii-Cal®/20 seconds; V20: Valo Cordless®/20 seconds; and V3: Valo Cordless®/3 seconds). All samples were stored for 6 months (water, 37ºC) and then subjected to a shear bond strength test (SBS). Bond failures were classified according to the Adhesive Remnant Index (ARI) and analyzed with the Kruskal-Wallis and Mann-Whitney tests (5%). Using the same factors, 120 resin discs were made to assess the degree of conversion (DC) of the monomer. Data from the SBS (MPa) and DC (%) were analyzed by analysis of variance (2 factors) and Tukey's test (5%). For the SBS, the factors "polymerization" (R20 = 8.1B; V20 = 13.2A; V3 = 5.2C, p = 0.0001) and "surface treatment" (A = 3.1C; ATxt = 13.6A; Tse = 12.3A; SBU = 6.3B, p = 0.0001) were statistically significant among groups. The highest adhesion value were found for the ATxt/V20 group (22.2A) and the lowest value for the A/R20 group (1.2E). Regarding ARI, score 2 was the most prevalent in groups A, ATxt, V20 and V3, while score 4 was the most prevalent in the Tse, SBU and R20 groups, with no significant difference between them (p = 1.0). Regarding DC, the factors "polymerization" (R20 = 66.6A; V20 = 58.4B; V3 = 45.1C, p = 0.0001) and "surface treatment" (A = 52B, ATxt = 59.7A, Tse = 51.4B, SBU = 63.8A, p = 0.0001) were statistically significant. Tse was more sensitive to the variations in polymerization protocols than the other surface treatments. Treatment A did not present suitable bond strength or degree of conversion.
本研究的目的是评估不同表面处理和聚合方案对托槽与牙釉质粘结强度以及粘结剂转化率的影响。将120颗牛牙冠嵌入丙烯酸树脂块中并进行打磨。接下来，将这些树脂块随机分为12组。根据“表面处理”因素（A：磷酸；ATxt：磷酸 + Transbond XT底漆；Tse：Transbond Plus自酸蚀底漆；SBU：Scotchbond通用型粘结剂）和“聚合”因素（R20：Radii-Cal/20秒；V20：Valo无绳光固化灯/20秒；V3：Valo无绳光固化灯/3秒）将金属托槽粘结到牙釉质上。所有样本在37℃水中储存6个月，然后进行剪切粘结强度测试（SBS）。根据粘结剂残留指数（ARI）对粘结失败进行分类，并采用Kruskal-Wallis检验和Mann-Whitney检验（5%）进行分析。使用相同因素制作120个树脂圆盘，以评估单体的转化率（DC）。通过方差分析（2个因素）和Tukey检验（5%）对SBS（MPa）和DC（%）的数据进行分析。对于SBS，“聚合”因素（R20 = 8.1B；V20 = 13.2A；V3 = 5.2C，p = 0.0001）和“表面处理”因素（A = 3.1C；ATxt = 13.6A；Tse = 12.3A；SBU = 6.3B，p = 0.0001）在各组之间具有统计学意义。ATxt/V20组的粘结力值最高（22.2A），A/R20组的粘结力值最低（1.2E）。关于ARI，2分在A组、ATxt组、V20组和V3组中最为常见，而4分在Tse组、SBU组和R20组中最为常见，它们之间无显著差异（p = 1.0）。关于DC，“聚合”因素（R20 = 66.6A；V20 = 58.4B；V3 = 45.1C，p = 0.0001）和“表面处理”因素（A = 52B，ATxt = 59.7A，Tse = 51.4B，SBU = 63.8A，p = 0.0001）具有统计学意义。与其他表面处理相比，Tse对聚合方案的变化更敏感。处理A没有呈现出合适的粘结强度或转化率。
