选择性激光熔化基底冠与铸造基底冠适合性的比较研究

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1、选择性激光熔化基底冠与铸造基底冠适合性的比较研究［摘要］目的：采用选择性激光熔化法与铸造法制作钻鎔合金基底冠，利用片切法来研究全冠修复体适合性，为临床应用提供理论基础。方法：选取临床上因正畸拔除健康上颌前磨牙1颗。按常规牙体预备。采用双重印模法取模，复制并灌注树脂模型后，选择性激光熔化法与铸造法制作基底冠各9个。依次粘结就位代型上，自凝塑料包埋，沿颊舌方向片切。在体式显微镜下，对基底冠与代型之间的适合性进行观察，CCD成像，用图像测量软件测量缝隙宽度。计算各组样本平均值，采用SPSS20.0软件包对数据进行统计学处理。结果：SLM钻牢各合金

2、基底冠适合性均值(49.50±4.72)um,明显小于铸造钻鎔合金基底冠(81.10±7.36)urn,具有显著性差异(P〈0.01)。结论：选择性激光熔化法间隙宽度小于铸造法，两种方法制作的钻鎔合金基底冠间隙均在临床可接受的lOOum以内。［关键词］选择性激光熔化；失蜡铸造；片切法；全冠适合性［中图分类号1R783［文献标识码］A［文章编号11008-6455(2014)23-1995-03Abstract：ObjectiveMakingthecobaIt—chromiumalloybasementcrownsusingtheselect

3、ivelasermeltingmethodandcastingmethodrespectively，andstudyingthecompatibilityofthecompletecoronalrestorationbodybymeansoftheslicecutmethodtoprovideabasictheoryfortheclinicalapplication.MethodsSelectedonehealthymaxillarypremolarwhichwasextractedfororthodontictreatment,thenm

4、adetheregulartoothpreparation.Gettingthemouldbymeansofthecombinedimpressionmethod,copyingthemouldandpouringresinintothem,thenusingtheselectivelasermeltingmethodandcastingmethodtomake9basementcrownsrespectively.The9crownswerebondedintodieseatonebyoneandwereinvestedinself-cu

5、ringresin,andwerecutalongthebuccolingualdirection.WeusedtheCCDtoimage,andusedanimagemeasurementsoftwaretomeasurethegapwidthafterobservedthecompatib订itybetweenthecrownsanddieseatsunderthestereomicroscope・Calculatingtheaverageofeachsamplegroups,andusingSPSS20.0softwarepackag

6、etoanalyzethedatastatistically.ResuItsThemeanvalue(49.50±4.72)umofthecompatibilityofcobaIt—chromiumalloycrownswhichmadebytheselectivelasermeltingmethodwassignificantlysmallerthanthat(81.10+7.36)ymofthecastingmethodgroup,andthedifferencewassignificant(P<0.01).ConclusionTheg

7、apwidthofthesamplemadebyselectivelasermeltingmethodissmallerthanthecastingmethodone，andthegapwidthofthecobaIt—chromiumalloycrownsmadebythesetwomethodsareallclinicalacceptable(withinlOOum).Keywords:selectivelasermelting；lostwaxcasting；slicemethod；fullcrownfit烤瓷溶附金属全冠是目前临床上常

8、用的修复形式，在口腔专科医院中占据冠桥修复体60%以上[1]o全冠修复体适合性是全冠修复的关键，直接影响到全冠的固位、美观及修复后牙周组织的健康，是判断修复体治疗成功与否的重要指