下顎第3大臼歯の抜歯に伴う病態の検討

Pathoses associated with mandibular third molars subjected to removal.

抄録

目的:

抜歯の対象となった下顎第3大臼歯の有病率を測定し、2つの手がかりについて病態発症リスクを推定すること。

OBJECTIVES: To measure the prevalence of disease of mandibular third molars referred for removal and to estimate the risk for development of pathoses for two cues.

研究デザイン:

抜歯の対象となった臼歯に関する前向きコホート研究を実施した。さまざまな疾患の有病率、患者の年齢、臼歯の角度位置、填頓の程度を登録した。異なる位置と填塞状態の臼歯のオッズ比を推定した。

STUDY DESIGN: A prospective cohort study on molars subjected to removal was performed. The prevalence of different diseases and the patient's age, angular position, and degree of impaction of the molars were registered. Odds ratio for molars with different positions and impaction states were estimated.

結果:

歯周炎は64％、第三大臼歯のう蝕は31％、歯周炎は8％、第二大臼歯のう蝕は5％、第二大臼歯の歯根吸収は1％であった。オッズ比は、遠心性大臼歯（5.8）および部分的に軟組織に覆われた大臼歯（6.7）で最も高かった。

RESULTS: Pericoronitis was found in 64% of cases, caries in the third molar in 31%, periodontitis in association with 8%, caries in the second molar in 5%, and root resorption of the second molar with 1% of the molars with pathoses. Odds ratio was highest for distoangular molars (5.8) and for molars partially covered by soft tissue (6.7).

結論:

オッズ比は、完全に軟組織または骨組織に覆われた臼歯よりも、部分的に軟組織に覆われた臼歯の方が約22倍および34倍高い。遠心性臼歯のオッズ比は、他の位置の臼歯のオッズ比の5～12倍である。

CONCLUSIONS: The odds ratio is about 22 and 34 times higher for molars partially covered by soft tissue than for molars completely covered by soft or bone tissue. For distoangular molars the odds ratio is 5 to 12 times higher than for molars in other positions.