Yadav Deepti, Golchha Vineet, Kamat Nandini, Paul Rahul, Sharma Pooja
Department of Orthodontics and Dentofacial Orthopedics, Inderprastha Dental College and Hospital, Ghaziabad, Uttar Pradesh, India.
Department of Orthodontics and Dentofacial Orthopedics, Goa Dental College, Bambolim, Goa, India.
Indian J Dent Res. 2018 Sep-Oct;29(5):646-650. doi: 10.4103/ijdr.IJDR_36_17.
: The objective of this study is to compare the neutralization effect of various antioxidant agents on the bond strength of composite resins on stainless steel and ceramic brackets immediately bonded to previously bleached teeth.
One hundred and sixty human maxillary premolars were used for the study. Teeth were divided into four groups (n = 40): Group 1 (control), Group 2 (bleached), Group 3 (sodium ascorbate), and Group 4 (tocopherol acetate). Each group was divided into two subgroups, one was bonded with stainless steel and other with ceramic brackets using 3M Transbond XT. Universal testing machine was used to determine the shear bond strength (SBS).
Among the metal brackets, Group 1A had the highest SBS (12.18 + 1.41 MPa) and Group 2A had the least SBS (6.18 + 1.49 MPa). Weibull analysis indicated that bond strength for a 90% probability of failure was highest for Group 1A (13.99 MPa) and lowest for Group 2A (8.49 MPa). For ceramic brackets, Group 1B had the highest SBS (13.80 + 1.69 MPa) and Group 2B had the least SBS (8.05 + 1.85 MPa). Weibull analysis indicated that bond strength for a 90% probability of failure was highest for Group 1B (14.61 MPa) and lowest for Group 2B (8.85MPa).
The in vitro study showed that bleaching reduced the SBS significantly, and this could be effectively reversed by the application of antioxidants in both metal and ceramic brackets.
本研究的目的是比较各种抗氧化剂对复合树脂与立即粘结到先前漂白牙齿上的不锈钢和陶瓷托槽之间粘结强度的中和作用。
本研究使用了160颗人类上颌前磨牙。牙齿分为四组（n = 40）：第1组（对照组）、第2组（漂白组）、第3组（抗坏血酸钠组）和第4组（醋酸生育酚组）。每组再分为两个亚组，一个亚组使用3M Transbond XT粘结不锈钢托槽，另一个亚组粘结陶瓷托槽。使用万能试验机测定剪切粘结强度（SBS）。
在金属托槽中，第1A组的SBS最高（12.18 + 1.41 MPa），第2A组的SBS最低（6.18 + 1.49 MPa）。威布尔分析表明，失效概率为90%时，第1A组的粘结强度最高（13.99 MPa），第2A组最低（8.49 MPa）。对于陶瓷托槽，第1B组的SBS最高（13.80 + 1.69 MPa），第2B组的SBS最低（8.05 + 1.85 MPa）。威布尔分析表明，失效概率为90%时，第1B组的粘结强度最高（14.61 MPa），第2B组最低（8.85MPa）。
体外研究表明，漂白显著降低了SBS，而在金属和陶瓷托槽中应用抗氧化剂可有效逆转这种情况。
