Abstract：
BACKGROUND: The aims were to investigate 1) the frequency of nonsurgical retreatment, root-end surgery, extraction, and further restorative treatment during a follow-up of 10-11 years after root filling and compare the frequencies according to tooth group and type of coronal restoration and 2) the timing of nonsurgical retreatment, root-end surgery, and extraction.
METHODS: Data were collected from the Swedish Social Insurance Agency\'s register. A search for treatment codes identified teeth root filled in 2009 and the type of coronal restoration (direct, indirect, and unspecified) registered within 6 months of root filling. The root-filled teeth were followed 10-11 years, and further interventions were recorded. Descriptive statistics and chi-square tests were used for statistical analysis.
RESULTS: In 2009, root fillings were registered for 215,611 individuals/teeth. Nonsurgical retreatment, root-end surgery, and extraction were undertaken in 3.5%, 1.4%, and 20% teeth, respectively. The frequency of further interventions varied with respect to tooth group and type of coronal restoration, but only slightly for endodontic retreatments. Further interventions, except for root-end surgery, were registered more often for molars and directly restored teeth (P < .001). The majority of endodontic retreatments were undertaken within 4 years, while extractions were evenly distributed over 10-11 years.
CONCLUSIONS: The frequency numbers of nonsurgical retreatment and root-end surgery were low, despite 1 in 5 root-filled teeth registered as extracted. Further interventions were most common in molars and directly restored teeth. Endodontic retreatments were performed more often during the first 4 years.
METHODS: Data were collected from the Swedish Social Insurance Agency\'s register. A search for treatment codes identified teeth root filled in 2009 and the type of coronal restoration (direct, indirect, and unspecified) registered within 6 months of root filling. The root-filled teeth were followed 10-11 years, and further interventions were recorded. Descriptive statistics and chi-square tests were used for statistical analysis.
RESULTS: In 2009, root fillings were registered for 215,611 individuals/teeth. Nonsurgical retreatment, root-end surgery, and extraction were undertaken in 3.5%, 1.4%, and 20% teeth, respectively. The frequency of further interventions varied with respect to tooth group and type of coronal restoration, but only slightly for endodontic retreatments. Further interventions, except for root-end surgery, were registered more often for molars and directly restored teeth (P < .001). The majority of endodontic retreatments were undertaken within 4 years, while extractions were evenly distributed over 10-11 years.
CONCLUSIONS: The frequency numbers of nonsurgical retreatment and root-end surgery were low, despite 1 in 5 root-filled teeth registered as extracted. Further interventions were most common in molars and directly restored teeth. Endodontic retreatments were performed more often during the first 4 years.
摘要：
背景：目的是调查1）非手术再治疗的频率，根端手术,提取,并在牙根充填后10至11年的随访中进一步修复治疗，并根据牙组和冠状修复类型比较频率，2)非手术再治疗的时机，根端手术,和提取。
方法：数据来自瑞典社会保险机构的登记册。对治疗代码的搜索确定了2009年填充的牙根和冠状修复的类型(直接，间接，未指定)在根填充后6个月内注册。对充满牙根的牙齿进行了10-11年的随访，并记录了进一步的干预措施。采用描述性统计和卡方检验进行统计分析。
结果：2009年，记录了215,611个人/牙齿的根填充物。非手术再治疗,根端手术,提取量为3.5%，1.4%,20%的牙齿，分别。进一步干预的频率因牙组和冠状修复类型而异，但只有轻微的牙髓再治疗。进一步的干预措施，除了根端手术,磨牙和直接修复牙齿的登记频率更高(P<0.001)。大多数牙髓再治疗是在4年内进行的，而提取物在10-11年内均匀分布。
结论：非手术再治疗和根端手术的频率较低，尽管五分之一的牙根填充牙齿注册为拔牙。进一步的干预最常见于磨牙和直接修复的牙齿。在最初的4年中，牙髓再治疗的频率更高。
方法：数据来自瑞典社会保险机构的登记册。对治疗代码的搜索确定了2009年填充的牙根和冠状修复的类型(直接，间接，未指定)在根填充后6个月内注册。对充满牙根的牙齿进行了10-11年的随访，并记录了进一步的干预措施。采用描述性统计和卡方检验进行统计分析。
结果：2009年，记录了215,611个人/牙齿的根填充物。非手术再治疗,根端手术,提取量为3.5%，1.4%,20%的牙齿，分别。进一步干预的频率因牙组和冠状修复类型而异，但只有轻微的牙髓再治疗。进一步的干预措施，除了根端手术,磨牙和直接修复牙齿的登记频率更高(P<0.001)。大多数牙髓再治疗是在4年内进行的，而提取物在10-11年内均匀分布。
结论：非手术再治疗和根端手术的频率较低，尽管五分之一的牙根填充牙齿注册为拔牙。进一步的干预最常见于磨牙和直接修复的牙齿。在最初的4年中，牙髓再治疗的频率更高。
