Department of Restorative Dentistry, Faculty of Dentistry, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, Kuala Lumpur, Malaysia.
Dental Specialist Polyclinic, Tuanku Mizan Malaysia Armed Forced Hospital, Wangsa Maju, Kuala Lumpur.
Undersea Hyperb Med. 2021 Fourth Quarter;48(4):391-397.
Changes in barometric pressure conditions that occur during flying and diving under hyperbaric oxygen conditions were found to influence the retention of dental restorations.
This experimental laboratory study aimed to evaluate the bond strength of glass fiber posts after being cemented with self-adhesive resin cement (RelyX™ Unicem, 3M ESPE) and self-etch adhesive resin cement (RelyX™ Ultimate, 3M ESPE) under normal atmospheric pressure and hyperbaric pressure cycles that simulate diving conditions.
A total of 40 extracted, single-rooted mandibular premolars were treated endodontically and randomly divided into two groups according to the cements used for fiber post cementation. Each group was further randomly divided into two equal subgroups that were subjected to normal atmospheric pressure conditions and a simulated hyperbaric condition in a hyperbaric chamber. The pull-out bond strength of fiber posts was tested using a universal testing machine. Data were analyzed using one-way analysis of variance with Tukey post-hoc test (p<0.05).
At normal atmospheric pressure the mean value of the pull-out bond strength of RelyX Ultimate cement was significantly higher than that of RelyX Unicem cement. At hyperbaric pressure condition no significant difference was found between the mean values of the pull-out bond strength of RelyX Ultimate and RelyX Unicem cement.
Hyperbaric pressure cycles demonstrated improved pull-out bond strength of glass fiber posts in RelyX Unicem cement but did not have significant effect on pull-out bond strength in RelyX Ultimate cement. Both resin cements have similar pull-out bond strength of glass fibers post after simulated dives.
在飞行和高压氧潜水条件下，气压条件的变化被发现会影响牙修复体的保留。
本实验性实验室研究旨在评估玻璃纤维桩在正常大气压力和模拟潜水条件下的高压压力循环下用自粘树脂水泥（RelyX™Unicem，3M ESPE）和自酸蚀树脂水泥（RelyX™Ultimate，3M ESPE）粘结后的粘结强度。
共 40 颗下颌单根前磨牙经根管治疗后，随机分为两组，根据纤维桩粘结用水泥进行分组。每组再随机分为两组，分别在高压室中进行正常大气压力和模拟高压条件下的测试。使用万能试验机测试纤维桩的拔出粘结强度。采用单因素方差分析和 Tukey 事后检验进行数据分析（p<0.05）。
在正常大气压力下，RelyX Ultimate 水泥的拔出粘结强度的平均值明显高于 RelyX Unicem 水泥。在高压条件下，RelyX Ultimate 和 RelyX Unicem 水泥的拔出粘结强度平均值之间无显著性差异。
高压压力循环提高了 RelyX Unicem 水泥中玻璃纤维桩的拔出粘结强度，但对 RelyX Ultimate 水泥的拔出粘结强度没有显著影响。两种树脂水泥在模拟潜水后对玻璃纤维桩的拔出粘结强度相似。
