中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2010年
11期
650-654
,共5页
正畸学,矫正%计算机%轴倾%转矩
正畸學,矯正%計算機%軸傾%轉矩
정기학,교정%계산궤%축경%전구
Orthodontics,corrective%Computer%Tip%Torque
目的 应用三维数字化技术探索正畸治疗中上颌尖牙、前磨牙和磨牙三维位置的变化规律.方法 通过随机数字表随机抽取北京大学口腔医学院·口腔医院正畸科资料完整的病例28例(减数组、非减数组各14例).点激光扫描获得三维数字化牙颌模型,用腭皱重叠方法重叠矫治前后的上颌数字化模型,用三维图像配准技术将矫治后牙齿的临床冠面轴转移至矫治前同名牙上,以矫治后上颌(牙合)平面为共同参考面,分别测量减数和非减数组矫治前后上颌尖牙、前磨牙和磨牙轴倾和转矩的变化.结果 非减数组矫治后第二前磨牙轴倾减小1.5°,矫治前后差异有统计学意义(P＜0.05);矫治后上颌第一、第二前磨牙冠颊向转矩分别增加5.1°和4.2°,与矫治前相比,差异有统计学意义(P＜0.05).减数组矫治后上颌尖牙冠舌向转矩增加3.8°,矫治前后差异有统计学意义(P＜0.05).结论 三维图像配准技术可将矫治前后的数字化牙颌模型置于同一坐标系中测量矫治前后牙齿轴倾和转矩的变化.非减数矫治具有后倾上颌第二前磨牙,颊倾上颌前磨牙的作用;而减数矫治具有舌倾上颌尖牙的作用.
目的 應用三維數字化技術探索正畸治療中上頜尖牙、前磨牙和磨牙三維位置的變化規律.方法 通過隨機數字錶隨機抽取北京大學口腔醫學院·口腔醫院正畸科資料完整的病例28例(減數組、非減數組各14例).點激光掃描穫得三維數字化牙頜模型,用腭皺重疊方法重疊矯治前後的上頜數字化模型,用三維圖像配準技術將矯治後牙齒的臨床冠麵軸轉移至矯治前同名牙上,以矯治後上頜(牙閤)平麵為共同參攷麵,分彆測量減數和非減數組矯治前後上頜尖牙、前磨牙和磨牙軸傾和轉矩的變化.結果 非減數組矯治後第二前磨牙軸傾減小1.5°,矯治前後差異有統計學意義(P＜0.05);矯治後上頜第一、第二前磨牙冠頰嚮轉矩分彆增加5.1°和4.2°,與矯治前相比,差異有統計學意義(P＜0.05).減數組矯治後上頜尖牙冠舌嚮轉矩增加3.8°,矯治前後差異有統計學意義(P＜0.05).結論 三維圖像配準技術可將矯治前後的數字化牙頜模型置于同一坐標繫中測量矯治前後牙齒軸傾和轉矩的變化.非減數矯治具有後傾上頜第二前磨牙,頰傾上頜前磨牙的作用;而減數矯治具有舌傾上頜尖牙的作用.
목적 응용삼유수자화기술탐색정기치료중상합첨아、전마아화마아삼유위치적변화규률.방법 통과수궤수자표수궤추취북경대학구강의학원·구강의원정기과자료완정적병례28례(감수조、비감수조각14례).점격광소묘획득삼유수자화아합모형,용악추중첩방법중첩교치전후적상합수자화모형,용삼유도상배준기술장교치후아치적림상관면축전이지교치전동명아상,이교치후상합(아합)평면위공동삼고면,분별측량감수화비감수조교치전후상합첨아、전마아화마아축경화전구적변화.결과 비감수조교치후제이전마아축경감소1.5°,교치전후차이유통계학의의(P＜0.05);교치후상합제일、제이전마아관협향전구분별증가5.1°화4.2°,여교치전상비,차이유통계학의의(P＜0.05).감수조교치후상합첨아관설향전구증가3.8°,교치전후차이유통계학의의(P＜0.05).결론 삼유도상배준기술가장교치전후적수자화아합모형치우동일좌표계중측량교치전후아치축경화전구적변화.비감수교치구유후경상합제이전마아,협경상합전마아적작용;이감수교치구유설경상합첨아적작용.
Objective To investigate three-dimensional imaging registration and superimposition techniques in measuring the tip and torque change of upper canine, premolar and first molar after orthodontic treatment. Methods Twenty-eight subjects (14 extraction cases and 14 non-extraction cases) with full records were randomly selected from the Department of Orthodontics, Peking University School and Hospital of Stomatology. The pre-and post-treatment upper dental casts were digitized with three-dimensional spot laser scanner and superimposed with reverse engineering software. The facial axis of the clinical crown (FACC) was transferred from post-treatment teeth to the pre-treatment teeth using three-dimensional imaging registration. The occlusal plane was constructed on the post-treatment upper digital cast and the tip and torque values were measured. Results In the non-extraction group, the tip of the second premolar decreased by 1. 5°(P ＜0. 05＝. The buccal crown torque of the first and second premolars increased by 5.1° and 4. 2°(P ＜ 0. 05＝, respectively. In the extraction group, the lingual crown torque of upper canine increased by 3. 8°(P ＜ 0. 05 ＝. Conclusions Non-extraction orthodontic treatment tended to tip the upper second premolar distally and increased the buccal crown torque of the upper premolars while extraction treatment increased the lingual crown torque of the upper canine.
