Department of Conservative Dentistry and Endodontics, M.G.V.'s K.B.H. Dental College and Hospital, Nashik, India.
Corresponding author: Dr Meenal N Gulve, Department of Conservative Dentistry and Endodontics, M.G.V.'s K.B.H. Dental College and Hospital, Nashik, India,
Diving Hyperb Med. 2022 Jun 30;52(2):97-102. doi: 10.28920/dhm52.2.97-102.
This study investigated the effect of pressure variations to which divers are subjected on shear bond strength of orthodontic brackets bonded to teeth with resin modified glass ionomer cement (RMGIC) or composite resin.
Eighty extracted premolars were randomly divided into two groups. Group 1: orthodontic brackets were bonded with RMGIC. Group 2: orthodontic brackets were bonded with composite resin. Each group was further divided into two subgroups. Subgroup A: The samples were kept at sea level pressure (101 kPa). Subgroup B: The samples were pressurised once from 101 kPa to 405 kPa for five minutes, then depressurised to 101 kPa. Shear bond strength was then measured.
Shear bond strength of brackets bonded with RMGIC in the simulated diving group was significantly less than that of ambient pressure group (P = 0.019), while no significant difference was found between the simulated diving group and ambient pressure group for brackets bonded with resin cement (P = 0.935). At ambient pressure, there was no significant difference between shear bond strength of brackets bonded with RMGIC and composite resin (P = 0.83). In simulated diving conditions, there was a statistically significant difference between shear bond strength of brackets bonded with the RMGIC and composite (P = 0.009).
Pressure changes during scuba diving may have an adverse effect on the retention of brackets bonded with RMGIC. Using composite resin for bonding brackets appears to be good strategy for patients such as divers who will be exposed to pressurised environments.
本研究旨在探讨潜水员所承受的压力变化对用树脂改良玻璃离子水门汀（RMGIC）或复合树脂粘结到牙齿上的正畸托槽的剪切粘结强度的影响。
从 80 颗拔除的前磨牙中随机分为两组。第 1 组：用 RMGIC 粘结正畸托槽。第 2 组：用复合树脂粘结正畸托槽。每组进一步分为两个亚组。亚组 A：样本保持在海平面压力（101kPa）。亚组 B：样本从 101kPa 加压至 405kPa 持续 5 分钟，然后减压至 101kPa。然后测量剪切粘结强度。
在模拟潜水组中，用 RMGIC 粘结的托槽的剪切粘结强度明显低于环境压力组（P=0.019），而用复合树脂粘结的托槽在模拟潜水组和环境压力组之间无显著差异（P=0.935）。在环境压力下，用 RMGIC 和复合树脂粘结的托槽的剪切粘结强度无显著差异（P=0.83）。在模拟潜水条件下，用 RMGIC 粘结的托槽和复合树脂的剪切粘结强度之间存在统计学上的显著差异（P=0.009）。
水肺潜水过程中的压力变化可能对用 RMGIC 粘结的托槽的固位产生不利影响。对于可能暴露于加压环境的潜水员等患者，使用复合树脂粘结托槽似乎是一种很好的策略。
