下顎中切歯または水平部分萌出下顎第3大臼歯に隣接する第2大臼歯の遠位う蝕のリスク因子：横断的研究

Risk factors for distal caries of second molars adjacent to mesioangular or horizontal partially erupted mandibular third molars: a cross-sectional study.

抄録

はじめに 下顎第3大臼歯の挺出は、無症状の場合もあれば、遠位う蝕や歯原性嚢胞・腫瘍などの病態を引き起こす場合もある。本研究では、中斜頸または水平に部分萌出した下顎第三大臼歯に隣接する下顎第二大臼歯の遠位う蝕の有病率と、虫歯・欠損・充填歯（DMFT）リスク群、年齢、側方（左右）、性別に関する関係を調査した。方法 本研究は、中斜頸または水平に位置し部分萌出した下顎第三大臼歯の手術を予約した患者を対象とした。手術前にDMFTスコア、年齢、性別、左右を記録した。抜歯後、第二大臼歯の遠位う蝕を臨床検査した。遠位う蝕の有病率、およびDMFTリスク群、年齢、性別、側方との相関を明らかにした。男性および中等度または高リスク群の患者は、第二大臼歯の遠位う蝕を有意に発症しやすい。結論 性別とDMFTリスク群は、中斜角歯または水平に部分萌出した第三大臼歯に隣接する第二大臼歯の遠位う蝕の有病率に影響する。男性および中リスク群または高リスク群の患者では、予防的抜歯を考慮すべきである。

Introduction Impacted mandibular third molars can be asymptomatic or cause some pathologies, such as distal caries and odontogenic cysts and tumours. This study investigates the prevalence of distal caries of the mandibular second molar adjacent to the mesioangular or horizontally partially erupted mandibular third molar and its relationship regarding decayed, missing and filled teeth (DMFT) risk group, age, side (left-right) and sex.Methods The study included patients who had an appointment for mesioangular or horizontally positioned and partially erupted mandibular third molar surgery. Before the surgery, the DMFT score, age, sex and side were recorded. After extraction, the second molar was clinically examined for distal caries. The prevalence of distal caries and the correlation between the DMFT risk group, age, sex and side were determined.Results The study was conducted on 514 patients and involved 639 teeth. Men and patients in the moderate- or high-risk group are significantly prone to developing distal caries of the second molar. No statistically significant relationship exists regarding age group, side and position.Conclusion Sex and DMFT risk groups affect the prevalence of distal caries in second molars adjacent to the mesioangular or horizontally partially erupted third molars. The prophylactic extraction should be considered in men and patients in the moderate- or high-risk group.