中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2013年
1期
37-40
,共4页
鲁颖娟%常少海%伍虹%余艳崧%叶玉珊
魯穎娟%常少海%伍虹%餘豔崧%葉玉珊
로영연%상소해%오홍%여염숭%협옥산
转矩%有限元分析%正畸支抗%微螺钉种植体
轉矩%有限元分析%正畸支抗%微螺釘種植體
전구%유한원분석%정기지항%미라정충식체
Torque%Finite element analysis%Orthodontic anchorage procedures%Mini-screw
目的 通过三维有限元方法探讨转矩对不同直径与长度的微螺钉种植体初期稳定性的影响,为正畸临床提供参考.方法 建立96个上颌骨实体模型,并建立直径分别为1.2、1.6、2.0 mm,长度分别为6、8、10、12 mm共12种尺寸的微螺钉种植体实体模型,将每种尺寸的种植体分别与8个上颌骨模型结合,并用随机数表法随机选出4个加载1.96 N水平力(水平力组),另外4个加载6N·mm转矩和1.96 N水平力(复合作用组),分析两组种植体位移峰值的区别,以及两种加载条件下直径和长度对种植体位移峰值的影响.结果 种植体长度不改变加载条件对位移峰值的影响,但种植体直径与加载条件间有相互作用,种植体直径为1.2、1.6、2.0 mm时水平力组种植体位移峰值[分别为(7.71 ±0.49)、(3.94±0.31)、(2.32±0.43)μm]均显著低于复合作用组[分别为(9.22±0.63)、(4.62士0.52)、(2.69±0.49) μm] (P ＜0.05).种植体直径为1.2 mm时的两组位移峰值差值[(1.61±0.22)μm]显著大于直径为1.6、2.0mm时的两组位移峰值差值[(0.64±0.12)、(0.49±0.06) μm] (P ＜0.05).结论 水平力复合转矩对种植体初期稳定性存在不利影响,对种植体同时施加转矩和水平力时应使用直径大于1.2 mm的种植体.
目的 通過三維有限元方法探討轉矩對不同直徑與長度的微螺釘種植體初期穩定性的影響,為正畸臨床提供參攷.方法 建立96箇上頜骨實體模型,併建立直徑分彆為1.2、1.6、2.0 mm,長度分彆為6、8、10、12 mm共12種呎吋的微螺釘種植體實體模型,將每種呎吋的種植體分彆與8箇上頜骨模型結閤,併用隨機數錶法隨機選齣4箇加載1.96 N水平力(水平力組),另外4箇加載6N·mm轉矩和1.96 N水平力(複閤作用組),分析兩組種植體位移峰值的區彆,以及兩種加載條件下直徑和長度對種植體位移峰值的影響.結果 種植體長度不改變加載條件對位移峰值的影響,但種植體直徑與加載條件間有相互作用,種植體直徑為1.2、1.6、2.0 mm時水平力組種植體位移峰值[分彆為(7.71 ±0.49)、(3.94±0.31)、(2.32±0.43)μm]均顯著低于複閤作用組[分彆為(9.22±0.63)、(4.62士0.52)、(2.69±0.49) μm] (P ＜0.05).種植體直徑為1.2 mm時的兩組位移峰值差值[(1.61±0.22)μm]顯著大于直徑為1.6、2.0mm時的兩組位移峰值差值[(0.64±0.12)、(0.49±0.06) μm] (P ＜0.05).結論 水平力複閤轉矩對種植體初期穩定性存在不利影響,對種植體同時施加轉矩和水平力時應使用直徑大于1.2 mm的種植體.
목적 통과삼유유한원방법탐토전구대불동직경여장도적미라정충식체초기은정성적영향,위정기림상제공삼고.방법 건립96개상합골실체모형,병건립직경분별위1.2、1.6、2.0 mm,장도분별위6、8、10、12 mm공12충척촌적미라정충식체실체모형,장매충척촌적충식체분별여8개상합골모형결합,병용수궤수표법수궤선출4개가재1.96 N수평력(수평력조),령외4개가재6N·mm전구화1.96 N수평력(복합작용조),분석량조충식체위이봉치적구별,이급량충가재조건하직경화장도대충식체위이봉치적영향.결과 충식체장도불개변가재조건대위이봉치적영향,단충식체직경여가재조건간유상호작용,충식체직경위1.2、1.6、2.0 mm시수평력조충식체위이봉치[분별위(7.71 ±0.49)、(3.94±0.31)、(2.32±0.43)μm]균현저저우복합작용조[분별위(9.22±0.63)、(4.62사0.52)、(2.69±0.49) μm] (P ＜0.05).충식체직경위1.2 mm시적량조위이봉치차치[(1.61±0.22)μm]현저대우직경위1.6、2.0mm시적량조위이봉치차치[(0.64±0.12)、(0.49±0.06) μm] (P ＜0.05).결론 수평력복합전구대충식체초기은정성존재불리영향,대충식체동시시가전구화수평력시응사용직경대우1.2 mm적충식체.
Objective To investigate the influence of the diameter and length of the mini-implant on the primary stability after loading with composite forces (CF) which contained torque and horizontal forces (HF).Methods Ninety-six finite element models were established by the combination of mini-implant and bone,diameters (1.2 mm,1.6 mm,2.0 mm) and length (6 mm,8 mm,10 mm,12 mm).There were 12 sizes,each size corresponded with 8 models.Group HF (each size n =4) was loaded with 1.96 N horizontal force and Group CF (each size n =4) was loaded with composite force which contained 6 N · mm torque and 1.96 N horizontal force.The maximum displacement of mini-implant with different force directions,implant diameters and lengths were evaluated.Results The effect of force direction on the displacement related to diameter of mini-implant.The maximum displacement under load with HF respectively was changed with the changing of diameter[1.2 mm:(7.71 ±0.49) μm; 1.6 mm:(3.94 ±0.31) μm; 2.0 mm:(2.32 ±0.43) μm],which were smaller than the maximum displacement of Group CF[1.2 mm:(9.22 ±0.63) μm; 1.6 mm:(4.62±0.52) μm; 2.0 mm:(2.69 ±0.49) μm](P＜0.05).When diameter was 1.2 mm,the difference of the maximum displacement[(1.61 ± 0.22) μm]between Group HF and CF was more obvious than that when the diameter was 1.6 mm or 2.0 mm[(0.64 ±0.12),(0.49 ± 0.06) μ m] (P ＜ 0.05).Conclusions The composite force had unfavorable effect on the primary stability of the mini-implant.The diameter of the mini-implant had better be larger than 1.2 mm when the composite forces were applied.
