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目的评价聚合瓷纤维桩核与玻璃纤维桩核的抗折强度。方法选择2012年1月至2013年1月广东医学院附属深圳南山医院口腔科门诊因牙周病拔除的20颗根长相似的上颌中切牙,随机分为聚合瓷纤维桩组和玻璃纤维桩组,每组各10颗。根管治疗后切除牙冠,聚合瓷纤维桩组采用牙周固位纤维增强的Adoro聚合瓷纤维桩核修复,玻璃纤维桩组采用Para Post Taper Lux玻璃纤维桩核修复。两组样本进行抗折强度测试,记录折断模式及所加载的最大负荷。结果聚合瓷纤维桩组牙齿折裂时负荷为(593.0±71.01)N,玻璃纤维桩组为(645.4±63.63)N,两组差异无统计学意义(t=1.737,P>0.05)。两组的折裂位置大部分发生于牙根颈1/3处,分布差异无统计学意义(χ2=1.25,P>0.05)。结论聚合瓷纤维桩核系统与玻璃纤维桩核系统的抗折强度和折裂位置分布相似,聚合瓷纤维桩核系统应用于临床的修复效果尚有待进一步观察。
Objective To evaluate the flexural strength of polymer fiber post core and glass fiber post core. METHODS: From January 2012 to January 2013, 20 root-length maxillary central incisors with similar root length extracted from dental department of Shenzhen Nanshan Hospital affiliated to Guangdong Medical College from January 2012 to January 2013 were randomly divided into three groups: Groups of 10 each. The coronal cut was performed after root canal treatment. The group of PCF was repaired by Adoro polymeric fiber post reinforced with periodontal retention fibers, and the fiber post was treated with Para Post Taper Lux fiberglass post. Two sets of specimens were tested for flexural strength and the breaking mode and the maximum load loaded were recorded. Results There was no significant difference between the two groups (t = 1.737, P> 0.05). The load of the teeth during the fracture was (593.0 ± 71.01) N and that of the glass fiber post was (645.4 ± 63.63) N, respectively. Most of the fracture sites of the two groups occurred in the 1/3 of the root of the tooth, with no significant difference in distribution (χ2 = 1.25, P> 0.05). Conclusions The flexural strength and fracture site distribution of the polymer-fiber post-core system are similar to those of the glass fiber post-core system. The application of the polymer-fiber post-core system to the clinical repair remains to be further studied.