牙根进人上颌窦深度对正畸支抗的影响： 一项三维有限元研究

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中图分类号：R783 文献标志码：A DOI：10.3969/j.issn.1003-1383.2025.10.009

【Abstract】ObjectiveTo investigatethebiomechanical changes themaxillryfirstmolar itssurroundingtissues underorthodonticforceswithdiferentdepthsrotpenetrationintothemaxillrysinus，soastoprovidereferenceforclinical anchorage design.MethodsThree-dimensional finite element models themaxillarysinus，maxillryfirst molar， surroundingtissues were constructed based on CBCTdata，simulating 7root penetration depths intothe maxilary sinus： model1（no penetration，control group），model2（rootcontacting sinus floor cortical bone），model3-7（penetrationdepths 1.5mm ， 3.0mm ， 4.0mm ， 5.0mm ， 6.5mm ，respectively）.ANSYS stware was used to apply orthodontic forces （horizontallytowardsthemesialverticallytowardstheapicaldirection），stressdistributiontoothdisplacement under 42 working conditions were analyzed. Results ① When the root contacted the sinus floor cortical bone，tooth micromovement surrounding tissue stress significantly decreased，while sinus floor cortical bone stress increased. ② Asthe depth the toothrootincreased，stressmicromovement graduallincreased，exceedingthecontrolgroupafter1.5mm penetration stabilizing thereafter.ConclusionThe depth maxilary molarroo penetrationintothe maxillry sinus is closelyrelated toorthodonticanchorage：optimalanchorageisahievedwhentherootcontactsthesinusfloor；whenthe toth root enters the maxillary sinus 1.5mm ，the anchorage is weaker than the control group（the tooth root does not enter the maxillary sinus）， as the depth entry increases （ 1.5--6.5mm ），the anchorage continues to weaken tends to stabilize，making toth movementeasier.Thisstudyprovidesbiomechanical evidencefororthodontictreatmentinvolvig the maxillary sinusregion.

【Keywords】maxillry first molar;maxillarysinus；three-dimensional finite element；rotpenetrationdepth；orthodontic anchorage

在正畸临床治疗中，牙根与上颌窦的关系一直是影响牙齿移动效果的重要因素。（剩余6322字）