摘要
Interfacedebondingbetweenprosthesesandabutmentswasthemostfrequentfailuremodeofresin-bondedfixedpartialsdentures(RBFPDs)inclinic.ThepurposeofthisstudywastoinvestigatetheeffectofaccessoryretentionformsonthebondstrengthofRBFPDs.Threetypesof3Dfiniteelementmodelswereconstructed.ThemodelofposteriormetalplateRBFPDwithspoon-shapedocclusalrestseatsservedasthecontrol.Theremainingtwotypesofmodelsbasedonthecontroladdedtheretentionformdesignofthepinholeandaxialgrooverespectively.Theaxialorbuccolingualloadof150Nwasappliedontheprosthesis,firstpremolarandfirstmolarrespectively.Themaximumprincipalstressesoftheadhesivelayerindifferentmodelswerecalculated.Undertheloadofthesamemagnitude,thestressduetothebuccolingualloadwassignificantlyhigherthanthatduetotheaxialloadintheadhesivelayer.Theproximalshoulder,occlusalrestseatswallandtheproximalmarginadjacenttotheshoulderwerethehighriskregionwheretheadhesivelayerdamagedeasily.Comparedwiththecontrolmodel,thepinandgroovemodelscouldslightlydecreasethestressintheadhesivelayeraftertheaxialloading,whilethestressintheadhesivelayerdrasticallydecreasedafterhorizontalloadingandreducedby22%and31%respectively.TheseresultsindicatethatthehorizontalocclusalforcehasamoreseriousharmtothedebondingofRBFPDs.Inaddition,theaccessoryretentionforms(e.g.pinandaxialgrooveretentionforms)candecreasethestresslevelintheadhesivelayer,whichareconducivetoincreasetheload-bearingcapacityofRBFPDs.
出版日期
2016年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
