拔牙区域不同形式连接桥体在隐形矫治远移尖牙过程中的三维有限元分析
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中图分类号：R783.5 文献标志码：A DOI：10.11958/20251185
Three-dimensional finite element analysis of different pontic designs in the extraction area of clearaligners during the distalization of canine
GUO Ziyuan1，2，3，LI Jiahui1，3，ZHANG Xizhong1，3△，WANG Yifan1，3 1DepartmentticsnoliclHspal，olficie，iUesityj; 2SchoolofClinical Stomatology，Tianjin Medical University;3Tianjin KeyLaboratory of Oral and Maxillofacial Function Reconstruction △Corresponding Author E -mail： Zhangxizhong999@hotmail.com
Abstract：ObjectiveTo explore theeffectof different ponticdesigns inresisting stress interruption effectandroller coasterphenomenon through three-dimensional finiteelementanalysis，providingclinicalguidance fortheapplicationof clearaligners inextractioncases.MethodsFourthree-dimensionalfiniteelement modelsof diferentponticdesigns inthe extractionareaofclearalignerswereestablished，including thepontic-freeconnectiondesign，theconventionalhollowpontic design，the partiallysolid-filledpontic designandthefullysolid-flled ponticdesign.Allfouraligner modelswere individuallyassembledwith thedentalarch model.AO.2mmdistal movementof thecanine wassimulated toobserve the initialdisplacementandperiodontal ligamentstressdistributionof canineandsecond premolar ineach groupof models. ResultsThe initial displacement tendencydiagramrevealed that inall experimental conditions，both thecanineand second premolarexhibitedtippingmovementpaterns.However，significantvariationsininitialdisplacement magnitudes wereobservedacross different ponticdesigns.The fullysolid-filld pontic-connected clearaligner model exhibited the greatest initialdisplacementvalues（bothcrownandroot）and themaximuminitial displacement magnitude.Notably，this kind of designdisplayed movement characteristicscloser tobodily movement，indicatingsuperiorcontrol eficacyintooth positioning.Periodontal ligament stressanalysisrevealed thatthefullysolid-flled pontic-connected clear alignermodel generatedthe highest maximumprincipal stress intheperiodontal ligament.ConclusionThis three-dimensional finite elementstudyreveals thattheapplicationofsolid-filledpontic inclearalignertherapycould improve biomechanicalcontrol atextractionsitesbyminimizingalignerdistortion，reducing stress interruptionefectandpreventing therolercoaster
phenomenon.
Key words：tooth abnormalities;orthodontic appliances;finite element analysis;clear aligner technology
在现代口腔正畸领域，无托槽隐形矫治技术因美观、舒适和便捷受到广泛关注[。（剩余9445字）