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雙側下顎第二大臼齒近心阻生之矯正治療—病例報告

Orthodontic Treatment of Bilateral Mesially Impacted Mandibular Second molars—Case Report

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摘要


下顎第二大臼齒阻生臨床上並不常見,治療考慮的複雜性高於一般療例的矯正治療。文獻上有各種不同的治療選擇,包括拔除第三大臼齒然後扶正第二大臼齒,或者拔除第二大臼齒然後扶正並前移第三大臼齒,甚至有直接以手術扶正第二大臼齒的治療選擇,選擇拔除第一大臼齒的報告則較為少見,本文報告一病例,因為考慮到第一大臼齒本身有齲齒或牙根外吸收的問題,以及考慮到下顎齒列需有拔牙空間來改善門齒角度及史比曲線(curve of Spee),所以選擇拔除第一大臼齒,然後扶正並前移第二大臼齒,治療過程中儘量避免過度挺出第二大臼齒,防止下顎向後下方旋轉,下顎平面角增加,惡化顏面輪廓。30個月後,順利扶正第二大臼齒並關閉第一大臼齒的空間,第三大臼齒亦順利往前正常萌出,治療結果良好。

關鍵字

阻生牙 臼齒扶正 矯正治療

並列摘要


Bilaterally impacted permanent mandibular second molars do not occur frequently. When they do occur, they can complicate the treatment planning for malocclusions. Various approaches for correcting of the anomaly have been proposed. Orthodontically uprighting or extracting them and saving the third molars has been suggested. Surgical uprighting of the impacted molars has also been described. This report describes an alternative treatment plan for extracting the first molars. Treatment considerations and the outcome are discussed.

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