CAJ | 학술논문

目的：利用有限元方法探索下颌后牙区天然牙-种植体联合修复在不同骨质内的应力分布情况，以评定出适宜行联合修复所需的骨质类型。方法采用三维有限元分析法，分别对骨质为Ⅰ、Ⅱ、Ⅲ、Ⅳ类颌骨类型中的天然牙-种植体联合修复体施加动态载荷，并对各界面所承受的Von?Mises应力进行分析。结果皮质骨所受最大Von?Mises应力值从Ⅰ类骨到Ⅳ类骨逐渐增大，最大等效应力分别为89.229、91.860、125.840、158.420?MPa。松质骨所受最大Von?Mises应力值从Ⅰ类骨到Ⅳ类骨均逐渐减小，最大等效应力分别为58.584、43.645、21.688、18.249?MPa。在同一类模型中，松质骨和皮质骨的最大Von?Mises应力值均为舌颊向加载>颊舌向加载>垂直向加载。结论骨质的类型对修复体周围骨的应力分布有重要的影响，Ⅰ、Ⅱ类骨较Ⅲ、Ⅳ类骨更适合行种植体-天然牙联合修复。
목적：이용유한원방법탐색하합후아구천연아-충식체연합수복재불동골질내적응력분포정황，이평정출괄의행연합수복소수적골질류형。방법채용삼유유한원분석법，분별대골질위Ⅰ、Ⅱ、Ⅲ、Ⅳ류합골류형중적천연아-충식체연합수복체시가동태재하，병대각계면소승수적Von?Mises응력진행분석。결과피질골소수최대Von?Mises응력치종Ⅰ류골도Ⅳ류골축점증대，최대등효응력분별위89.229、91.860、125.840、158.420?MPa。송질골소수최대Von?Mises응력치종Ⅰ류골도Ⅳ류골균축점감소，최대등효응력분별위58.584、43.645、21.688、18.249?MPa。재동일류모형중，송질골화피질골적최대Von?Mises응력치균위설협향가재>협설향가재>수직향가재。결론골질적류형대수복체주위골적응력분포유중요적영향，Ⅰ、Ⅱ류골교Ⅲ、Ⅳ류골경괄합행충식체-천연아연합수복。
ObjectiveThis?study?aims?to?evaluate?the?influence?of?different?bone?types?on?the?stress?distribution?in?tooth?implant-supported?fixed?partial?prostheses?by?using?finite?element?(FE)?analysis.?Methods???Four?FE?models?of?mandibular?arch?containing?one?implant?splinted?to?the?mandibular?second?premolar?were?built?according?to?bone?types?Ⅰ,?Ⅱ,?Ⅲ,?and?Ⅳ.?Dy-namic?loads?of?250?N?were?applied?to?the?buccal?and?lingual?cusps?of?the?prostheses?in?different?directions?to?simulate?the?mas-ticatory?cycle.?The?maximum?Von?Mises?stresses?were?calculated?using?the?FE?analysis?software.?Results???The?maximum?Von?Mises?stresses?of?the?cortical?bones?were?89.229,?91.860,?125.840,?and?158.420?MPa,?increasing?from?type?Ⅰ?to?type?Ⅳ,?respec-tively.?The?maximum?Von?Mises?stresses?of?the?trabecular?bone?were?58.584,?43.645,?21.688,?and?18.249?MPa,?decreasing?from?type?Ⅰ?to?type?Ⅳ,?respectively.?During?the?process?of?dynamic?loading,?the?maximum?Von?Mises?stresses?of?the?cortical?and?trabecular?bones?followed?the?order?buccal?to?tongue?loading>tongue?to?buccal?loading>vertical?loading.?Conclusion???The?results?showed?that?bone?type?significantly?influenced?the?stress?distribution?in?bones,?and?that?for?tooth?implant-supported?fixed?partial?prostheses,?bone?types?Ⅰ?and?Ⅱ?were?a?better?choice?than?bone?types?Ⅲ?and?Ⅳ.?More?caution?should?be?exer-cised?when?restoring?missing?teeth?using?tooth?implant-supported?fixed?partial?prostheses?in?softer?bone?regions.