Amuk Nisa Gül, Baysal Aslı, Üstün Yakup, Kurt Gökmen
Department of Orthodontics, Erciyes University Faculty of Dentistry, Kayseri, Turkey.
Department of Orthodontics, İzmir Katip Çelebi University Faculty of Dentistry, İzmir, Turkey.
Eur Oral Res. 2018 May;52(2):69-74. doi: 10.26650/eor.2018.576. Epub 2018 May 1.
The aim of this study was to test the null hypothesis that no difference exists between shear bond strength values of control and bleaching plus desensitizer applied groups.
A hundred freshly extracted human premolar teeth were randomly divided into five groups. Group I served as the control group with no bleaching application, while only bleaching was achieved in Group II. Desensitizer containing potassium nitrate-fluoride and casein phosphopeptide amorphous calcium phosphate were applied in Groups III and IV, after bleaching respectively. A bleaching agent containing amorphous calcium phosphate was used in Group V. Shear bond strength tests were carried out using a universal testing machine (Instron Corp., Norwood, MA, USA). Remnant adhesive on the teeth and brackets was examined to score the adhesive remnant index. Kruskal-Wallis and Chi-Square tests were used for statistical analysis of the data.
Statistically significant differences were found among the groups for shear bond strength values (p<.001). The shear bond strength of Group III (8.0±2.2 MPa) was significantly lower than the other groups (p<.05). The highest shear bond strength values were found for Group I (13.6±3.7 MPa) and Group IV (12.8±4.0 MPa). No statistically significant difference was observed between Group II (10.0±2.7 MPa) and Group V (10.8±2.9 MPa). The differences between adhesive remnant index scores of the groups were not statistically significant.
Casein phosphopeptide amorphous calcium phosphate gel application showed a similar shear bond strength value to the control group, while shear bond strength values decreased after using other desensitizers.
本研究的目的是检验零假设，即对照组与应用漂白剂加脱敏剂组的剪切粘结强度值之间不存在差异。
将100颗新鲜拔除的人类前磨牙随机分为五组。第一组为对照组，未进行漂白处理，而第二组仅进行了漂白处理。第三组和第四组分别在漂白后应用了含硝酸钾-氟化物和酪蛋白磷酸肽无定形磷酸钙的脱敏剂。第五组使用了含无定形磷酸钙的漂白剂。使用万能试验机（美国马萨诸塞州诺伍德市英斯特朗公司）进行剪切粘结强度测试。检查牙齿和托槽上的残留粘合剂，以对粘合剂残留指数进行评分。使用Kruskal-Wallis检验和卡方检验对数据进行统计分析。
各组之间的剪切粘结强度值存在统计学显著差异（p<0.001）。第三组的剪切粘结强度（8.0±2.2MPa）显著低于其他组（p<0.05）。第一组（13.6±3.7MPa）和第四组（12.8±4.0MPa）的剪切粘结强度值最高。第二组（10.0±2.7MPa）和第五组（10.8±2.9MPa）之间未观察到统计学显著差异。各组之间的粘合剂残留指数评分差异无统计学意义。
应用酪蛋白磷酸肽无定形磷酸钙凝胶显示出与对照组相似的剪切粘结强度值，而使用其他脱敏剂后剪切粘结强度值降低。
