Gulve Meenal Nitin, Gulve Nitin Dilip
Department of Conservative Dentistry and Endodontics, M.G.V.'s K.B.H. Dental College and Hospital, Nashik, India.
Department of Orthodontics, Dentofacial Orthopedics and Dental Materials, M.G.V.'s K.B.H. Dental College and Hospital, Nashik, India.
Dent Res J (Isfahan). 2013 Nov;10(6):737-43.
Scuba diving is one of the fastest growing sports in the world. The objective of this study was to evaluate the effect of pressure variations to which divers are exposed on the pull out strength of glass fiber post luted with different cements.
In this in vitro study, 120 extracted, single-rooted lower premolars were endodontically treated. They were randomly divided into six groups and restored using the glass fiber post (Ivoclar Vivadent AG) and the following luting agents: Zinc phosphate, conventional glass ionomer, resin reinforced glass ionomer, resin cement with etch-and-rinse adhesive, resin cement with self-etching adhesive, and self-adhesive resin cement. Each group was randomly divided into two equal subgroups, one as a control, and the other to be used experimentally. After 7 days of storage, experimental groups were pressure cycled. The force required to dislodge each post was recorded in Newton (N) on Universal testing machine (Star Testing System) at a crosshead speed of 1 mm/min. Data were statistically analyzed using the ANOVA and Student's t-test (P < 0.001).
The pull out strength of posts cemented with zinc phosphate and conventional glass ionomer in pressure cycle group was significantly less than their control group. Although, no significant difference was found between pressure cycle and control group using resin reinforced glass ionomer cement and resin cements.
Dentist should consider using resin reinforced glass ionomer or resin cement, for the cementation of glass fiber post, for the patients such as divers, who are likely to be exposed to pressure cycling.
水肺潜水是世界上发展最快的运动之一。本研究的目的是评估潜水员所承受的压力变化对用不同粘结剂粘结的玻璃纤维桩拔出强度的影响。
在这项体外研究中，选取120颗拔除的单根下颌前磨牙进行根管治疗。将它们随机分为六组，使用玻璃纤维桩（义获嘉伟瓦登特公司）和以下粘结剂进行修复：磷酸锌、传统玻璃离子水门汀、树脂增强玻璃离子水门汀、带有酸蚀冲洗粘结剂的树脂粘结剂、带有自酸蚀粘结剂的树脂粘结剂和自粘结树脂粘结剂。每组随机分为两个相等的亚组，一组作为对照组，另一组用于实验。储存7天后，对实验组进行压力循环处理。在万能试验机（星测试系统）上，以1毫米/分钟的十字头速度记录拔出每根桩所需的力，单位为牛顿（N）。使用方差分析和学生t检验对数据进行统计学分析（P < 0.001）。
压力循环组中用磷酸锌和传统玻璃离子水门汀粘结的桩的拔出强度明显低于其对照组。然而，使用树脂增强玻璃离子水门汀和树脂粘结剂时，压力循环组与对照组之间未发现显著差异。
对于可能承受压力循环的患者，如潜水员，牙医在粘结玻璃纤维桩时应考虑使用树脂增强玻璃离子水门汀或树脂粘结剂。
