Takeuchi Noriko, Yamamoto Tatsuo, Tomofuji Takaaki, Murakami Chiharu
Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
Dent Traumatol. 2009 Jun;25(3):332-7. doi: 10.1111/j.1600-9657.2009.00768.x. Epub 2009 Feb 27.
Teeth with root fracture generally have a poor prognosis requiring extraction; however, some patients do not wish to have these teeth extracted. Dentists do not have enough information regarding the prognosis of teeth with root fracture. This study retrospectively examined the prognosis of teeth with root fracture in the maintenance phase of periodontal treatment and assessed the factors influencing the prognosis of teeth with root fracture. The clinical records of 100 patients, who had entered the maintenance phase of periodontal therapy in a university hospital and had experienced fracture of tooth root, were analyzed. The following parameters were included in the evaluation: age and gender of the subjects, tooth type, restoration and root-filling of the teeth with root fracture, and number of teeth present. Survival probability was assessed using Kaplan-Meier analysis. The median survival time (95% confidence interval) was 42 months (22-62 months). Teeth with horizontal fracture had a significantly higher survival probability compared with teeth with vertical fracture. No significant differences were found in the survival probability with regard to gender and tooth type. In conclusion, teeth with horizontal root fracture have a better prognosis compared with teeth with vertical root fracture in patients undergoing periodontal maintenance.
牙根折断的牙齿通常预后较差，需要拔除；然而，一些患者不希望拔除这些牙齿。牙医对于牙根折断牙齿的预后没有足够的信息。本研究回顾性地检查了牙周治疗维持期牙根折断牙齿的预后，并评估了影响牙根折断牙齿预后的因素。分析了100例在大学医院进入牙周治疗维持期且经历过牙根折断的患者的临床记录。评估包括以下参数：受试者的年龄和性别、牙齿类型、牙根折断牙齿的修复和根管充填情况以及现存牙齿数量。采用Kaplan-Meier分析评估生存概率。中位生存时间（95%置信区间）为42个月（22 - 62个月）。与垂直折断的牙齿相比，水平折断的牙齿具有显著更高的生存概率。在生存概率方面，性别和牙齿类型未发现显著差异。总之，在接受牙周维持治疗的患者中，水平牙根折断的牙齿比垂直牙根折断的牙齿预后更好。
