影響阻生門齒強逼萌出時間的因素評估

Factors Affecting the Treatment Duration of Forced Eruption of Impacted Incisors - A Reprospective Study

手術露出(surgical exposure ) 合併矯正方式拉出(orthodontic traction ) 是常用於阻生門齒的處理方式亦稱為強逼萌出(forced eruption) 冗長的治療時間是最大的缺點。本篇研究的目的在統計上顎阻生門齒強逼萌出平均所需時間，及可能影響治療時問之相關因子。結果顯示，患者平均就醫年齡8歲9個月，阻生齒切緣(incisal edge)至咬合面距離平均為18.8mm；平均治療時間為12 個月。阻生齒切緣(incisal edge) 至咬合面距離，為影響阻生門齒強迫性萌出時間的因素，距離越遠，治療時間越長。年齡、牙根彎曲、贅生齒／齒瘤、牙冠牙根走向、萌發空間喪失等因子的存在均會增加治療時間，但在本篇研究中並未達到統計上的差異。Purpose: The purpose of this study was to eva luate the possible factors that affected the duration of forced eruption of impacted upper incisors. Methods: 24 patients (mean age eight years and nine months old ), 25 upper impacted incisors were included in this study. Factors ana lysed included the age, the distance from impacted incisor edge to the occlusa l plane, presence of odontoma or supernumerary tooth, the crown orientation, eruption space loss and root dilaceration. Standardized panoramic radiograph was used as measurement tool. Results: The treatment duration is positively correlated to the distance from the incisor ledge to the occlusal plane (R2 =0.21; p=0.02) . No significant correlation was found between the treatment duration and age. The presence of the other variables increased the treatment duration, however, the results are not statistically significant. Conclusion: The distance from impacted incisor edge to the occlusal plane can be used as an estimate of time needed to complete the forced eruption technique.