Seraj Bahman, Ghadimi Sara, Estaki Zohreh, Fatemi Mostafa
Dental Research Center, Dentistry Research Institute and Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Laser Research Center of Dentistry and Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Dent Res J (Isfahan). 2015 Jul-Aug;12(4):372-8. doi: 10.4103/1735-3327.161461.
Restoration of anterior primary teeth with severe caries lesion is a big challenge. The aim of this study was to compare the fracture resistance of three types of post, including composite resin, customized quartz fiber and prefabricated glass fiber in restoration of severely damaged primary anterior teeth.
Sixty extracted human primary maxillary incisors were randomly divided into three groups: Group 1: Customized quartz fiber post, Group 2: Composite post and Group 3: Prefabricated glass fiber post. Due to the effect of bonded area on the fracture resistance, the bonded surface of each sample was measured 1 mm above cementoenamel junction. An increasing force was subjected with a crosshead speed of 0.5 mm/min by a universal testing machine until fracture occurred, and the failure mode was assessed afterwards. Data were analyzed using One-way analysis of variance and Kruskal-Wallis tests. The level of significance was considered at P < 0.05.
The mean fracture resistance values of three groups were 343.28 N, 278.70 N and 284.76 N, respectively. Although customized quartz fiber post showed the greatest fracture resistance, statistical analysis revealed no significant difference between groups (P = 0.21). The mean fracture strength values of three groups were 12.82 N/mm(-2), 11.93 N/mm(-2) and 11.31 N/mm(-2), respectively; however, the differences were not statistically significant (P = 0.72). Favorable failure mode was more frequent in all groups (P = 0.12).
Within the limitations of this study, it can be concluded that all three types of studied posts can be successfully used to restore badly destructed primary anterior teeth.
对患有严重龋损的乳前牙进行修复是一项巨大挑战。本研究的目的是比较三种桩（复合树脂桩、定制石英纤维桩和预成玻璃纤维桩）在修复严重受损乳前牙时的抗折性能。
将60颗拔除的人类上颌乳切牙随机分为三组：第1组：定制石英纤维桩；第2组：复合树脂桩；第3组：预成玻璃纤维桩。由于粘结面积对抗折性能有影响，每个样本的粘结面在牙釉质牙骨质界上方1mm处进行测量。通过万能试验机以0.5mm/min的十字头速度施加逐渐增加的力，直至发生断裂，随后评估失效模式。数据采用单因素方差分析和Kruskal-Wallis检验进行分析。显著性水平设定为P < 0.05。
三组的平均抗折力值分别为343.28N、278.70N和284.76N。尽管定制石英纤维桩显示出最大的抗折力，但统计分析表明各组之间无显著差异（P = 0.21）。三组的平均抗折强度值分别为12.82N/mm²、11.93N/mm²和11.31N/mm²；然而，差异无统计学意义（P = 0.72）。所有组中有利的失效模式更为常见（P = 0.12）。
在本研究的局限性内，可以得出结论，所有三种研究的桩都可以成功用于修复严重破坏的乳前牙。
