- 期刊
阻生門齒經矯正拉出後牙根及牙周變化的探討
Periodontal Status of Impacted Maxillary Incisors after Surgical Exposure and Orthodontic Extrusion - A Reprospective Study
摘要
手術露出合併矯正方式拉出，是常用於阻生門齒的處理方式。然而因為原先阻生位置的高度，近頰舌側的差異，牙根、不等程度的彎曲，即使拉出後，牙周健康的狀況以及牙根繼續發育、彎曲的程度，並不一定和鄰牙一致。本篇研究的目的在評估，上顎阻生門齒經過矯正拉出後，牙齒周圍軟硬組織的變化，以及牙根長度彎曲度跟對側正常牙齒的比較。研究結果顯示，阻生門齒經矯正拉出後，57%產生對側正常門齒牙齦高度不一致的情形；57%缺乏角化性牙齦；7%呈現術後齒槽骨缺失的情形；71%有牙根較短的現象。治療前的阻生門齒有71%為牙根彎曲情形，治療後牙根彎曲的比例降為61%。所有治療的阻生門齒，均無因為牙根骨性黏連而造成無法拉出的狀況。術前牙冠牙根走向和術後牙齦是否等高沒有顯著的相關;和術後頰側牙齦缺乏角化牙齦亦無顯著的相關。
並列摘要
The purpose of this study was to evaluate the periodontal status and the root condition of impacted maxillary incisors after surgical exposure and orthodontic extrusion. Methods: 28patients (mean age eight years and five months old), 28 upper impacted incisors were included in this study. Data analysed included age, original crown orientation, root dilaceration before and after intervention, root length and the presence of bony ankylosis. Standardized pre-and post-operative panoramic, periapical and lateral occlusal radiographs were used as measurement tools. Results: 57% of the impacted incisors presented with unequal gingival height with their contralateral normal incisors; lack of keratized gingiva was found in 57% of the cases; 7% revealed alveolar bone loss; 71% showed short roots. 71% of all cases have root dilaceration before treatement, while 61% remained with root dilaceration after treatment. None of the incisors presented with failure to treatment on account of bone fusion to root (ankylosis). Initial crown orientation was not significantly related to postoperative uneven gingival margin (p=0.334) ；Initial crown orientation was also not significantly related to the lack of keratinized mucosa over buccal ginviva (p=0.328).