中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2014年
6期
371-374
,共4页
孙玉春%李虹%王勇%王永波%吕培军
孫玉春%李虹%王勇%王永波%呂培軍
손옥춘%리홍%왕용%왕영파%려배군
计算机辅助设计%颌,无牙%义齿,全口%正中关系
計算機輔助設計%頜,無牙%義齒,全口%正中關繫
계산궤보조설계%합,무아%의치,전구%정중관계
Computer-aided design%Jaw,edentulous%Denture,complete%Centric relation
目的 使用两种方法进行无牙颌模型正中关系位三维重建,定量对比垂直距离和水平关系的重建精度,以期为全口义齿的计算机辅助设计与辅助制作(computer aided design and computer aided manufacture,CAD-CAM)提供参考.方法 临床制取5例无牙颌患者的上下颌模型及蜡(牙合)托,每个单颌模型底座轴面粘接10个等尺寸定位柱,即每副模型20个,配对12对定位柱底面圆心点对,以圆心点对的垂直距离和水平距离作为测量项目.用牙颌模型三维扫描仪获取上下颌单颌模型与蜡(牙合)托的完整表面数据,再分别用转移(牙合)架固定法和皮筋固定法将上下颌模型和蜡(牙合)托固定于正中关系位,扫描模型唇颊面.基于唇颊面共同区域进行配准,重建正中关系位双颌三维模型,使用测量软件进行数字模型测量.使用机械三坐标测力臂进行实物测量.计算实物测量值与数字模型测量值的差值,即垂直距离或水平距离误差,进行配对￡检验.结果 转移(牙合)架固定法和皮筋固定法的垂直距离误差分别为(0.356±0.200)和(0.382 ±0.299) mm,差异无统计学意义(P＞0.05);水平距离误差分别为(0.010±0.411)和(0.104±0.476) mm,差异有统计学意义(P＜0.05).结论 与皮筋固定法相比,借助转移(牙合)架,可显著提高无牙颌模型水平关系三维重建的精度.
目的 使用兩種方法進行無牙頜模型正中關繫位三維重建,定量對比垂直距離和水平關繫的重建精度,以期為全口義齒的計算機輔助設計與輔助製作(computer aided design and computer aided manufacture,CAD-CAM)提供參攷.方法 臨床製取5例無牙頜患者的上下頜模型及蠟(牙閤)託,每箇單頜模型底座軸麵粘接10箇等呎吋定位柱,即每副模型20箇,配對12對定位柱底麵圓心點對,以圓心點對的垂直距離和水平距離作為測量項目.用牙頜模型三維掃描儀穫取上下頜單頜模型與蠟(牙閤)託的完整錶麵數據,再分彆用轉移(牙閤)架固定法和皮觔固定法將上下頜模型和蠟(牙閤)託固定于正中關繫位,掃描模型脣頰麵.基于脣頰麵共同區域進行配準,重建正中關繫位雙頜三維模型,使用測量軟件進行數字模型測量.使用機械三坐標測力臂進行實物測量.計算實物測量值與數字模型測量值的差值,即垂直距離或水平距離誤差,進行配對￡檢驗.結果 轉移(牙閤)架固定法和皮觔固定法的垂直距離誤差分彆為(0.356±0.200)和(0.382 ±0.299) mm,差異無統計學意義(P＞0.05);水平距離誤差分彆為(0.010±0.411)和(0.104±0.476) mm,差異有統計學意義(P＜0.05).結論 與皮觔固定法相比,藉助轉移(牙閤)架,可顯著提高無牙頜模型水平關繫三維重建的精度.
목적 사용량충방법진행무아합모형정중관계위삼유중건,정량대비수직거리화수평관계적중건정도,이기위전구의치적계산궤보조설계여보조제작(computer aided design and computer aided manufacture,CAD-CAM)제공삼고.방법 림상제취5례무아합환자적상하합모형급사(아합)탁,매개단합모형저좌축면점접10개등척촌정위주,즉매부모형20개,배대12대정위주저면원심점대,이원심점대적수직거리화수평거리작위측량항목.용아합모형삼유소묘의획취상하합단합모형여사(아합)탁적완정표면수거,재분별용전이(아합)가고정법화피근고정법장상하합모형화사(아합)탁고정우정중관계위,소묘모형진협면.기우진협면공동구역진행배준,중건정중관계위쌍합삼유모형,사용측량연건진행수자모형측량.사용궤계삼좌표측역비진행실물측량.계산실물측량치여수자모형측량치적차치,즉수직거리혹수평거리오차,진행배대￡검험.결과 전이(아합)가고정법화피근고정법적수직거리오차분별위(0.356±0.200)화(0.382 ±0.299) mm,차이무통계학의의(P＞0.05);수평거리오차분별위(0.010±0.411)화(0.104±0.476) mm,차이유통계학의의(P＜0.05).결론 여피근고정법상비,차조전이(아합)가,가현저제고무아합모형수평관계삼유중건적정도.
Objective To reconstruct the centric relation of upper and lower edentulous dental models with two methods,to compare the reconstruction accuracy of the vertical and horizontal distance,and to provide some references to computer aided design and computer aided manufacture for complete denture.Methods Dental models and rims made from five edentulous patients in clinical were obtained.Each model was stocked with 10 identical size positioning cylinders (20 cylinders on each pair models) on 5 side-surfaces of basement.Twelve center point pairs were paired between upper and lower models from 20 cylinder bottoms.The vertical and horizontal distances of 12 center point pairs were regarded as the evaluation items.Firstly,upper and lower models and rims were scanned separately.Then,models and rims (fixed in centric relation respectively with positioning articulator and rubber banding) were scanned.In software,all the data were registered to reconstruct centric relation based on common region.Digital models were measured with software tools,and real models were measured with a contact measurement arm.The differences of the homologous items between two methods were analyzed with paired-t test.Results The vertical distance errors for dental articulator positioning method was (0.356 ± 0.200) mm and that of the rubber band method was (0.382 ± 0.299) mm,and paired-t test between the two methods showed no significant differences(P ＞ 0.05).The horizontal errors were (0.010 ± 0.411) mm and (0.104±0.476) mm,and paired-t test showed significant differences (P ＜ 0.05).Conclusions Comparing with rubber band method,dental articulator positioning can significantly increases three-dimensional reconstruction accuracy of edentulous jaw gypsum models' horizontal relation.
