Landt K, Hagstam-Harrison L, Kvist T, Frisk F, Dawson V S, Bjørndal L, Fransson H
Department of Endodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
Department of Endodontology, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Int Endod J. 2018 Sep;51(9):975-980. doi: 10.1111/iej.12907. Epub 2018 Feb 27.
To study the demographics of Swedish adults who had received a root filling, followed by extraction during the following 5-6 years in comparison with subjects who had undergone a corresponding root filling with an uneventful outcome.
The root filled maxillary first molar was chosen as the comparison model. The Swedish Social Insurance Agency provided data on all teeth reported as root filled in Sweden during 2009. A comparison group, equally large as the study group, was constructed by randomly selecting subjects with root filled maxillary first molars, which had not subsequently been extracted, that is, an uneventful outcome. Demographic data on the subjects were obtained from Statistics Sweden: country of birth, disposable income, educational level, age, civil status and gender. Chi-square, t-tests and logistic regression were used for statistical analyses.
In the year 2009, 36 139 maxillary first molar teeth were reported to have been root filled, 4362 (12.1%) of which were then recorded as extracted during the following 5-6 year period. Only minor intergroup differences were noted: 86.5% of the study group were Swedish-born, compared with 84.4% of the comparison group (P = 0.007). Women comprised 53.2% of the study group and 50.5% (P = 0.01) of the comparison group. There was an association between extractions and gender as well as age; men had a lower odds ratio (OR) for extraction OR, 0.87; confidence interval (CI), 0.80-0.95. For every additional year, the chance for extraction was higher OR, 1.01; CI, 1.01-1.01. No other significant differences were detected.
There was only little or no demographic differences between the study group, comprising Swedish adults who had undergone root filling of one of their maxillary first molars in 2009 and subsequent extraction during the following 5-6 years, and the comparison group, with uneventful outcomes after a corresponding root filling.
研究在接下来5至6年中接受过根管充填治疗随后又被拔除的瑞典成年人的人口统计学特征，并与接受了相应根管充填治疗且预后良好的受试者进行比较。
选取上颌第一磨牙根管充填情况作为比较模型。瑞典社会保险机构提供了2009年瑞典境内所有报告为已进行根管充填治疗的牙齿的数据。通过随机选择上颌第一磨牙已进行根管充填治疗且随后未被拔除（即预后良好）的受试者，构建一个与研究组规模相同的对照组。受试者的人口统计学数据来自瑞典统计局：出生国家、可支配收入、教育水平、年龄、婚姻状况和性别。采用卡方检验、t检验和逻辑回归进行统计分析。
2009年，报告有36139颗上颌第一磨牙进行了根管充填治疗，其中4362颗（12.1%）在随后的5至6年期间被记录为已拔除。仅观察到组间存在细微差异：研究组中86.5%为瑞典出生，而对照组为84.4%（P = 0.007）。研究组中女性占53.2%，对照组中女性占50.5%（P = 0.01）。拔牙与性别以及年龄之间存在关联；男性拔牙的比值比（OR）较低，为0.87；置信区间（CI）为0.80 - 0.95。每增加一岁拔牙的可能性更高，OR为1.01；CI为1.01 - 1.01。未检测到其他显著差异。
在2009年对其上颌第一磨牙之一进行根管充填治疗并在随后5至6年中拔除的瑞典成年人组成的研究组，与接受相应根管充填治疗后预后良好的对照组之间，人口统计学差异很小或不存在。
