瓷边缘设计钴铬合金金属烤瓷冠的临床适用性  

Clinical applicability of cobalt-chromium metal-ceramic crowns with porcelain margin

作　　者：陈熙[1] 程辉[1] 陈加慧 李秀容[1] Chen Xi;Cheng Hui;Chen Jiahui;Li Xiurong(School of Stomatology,Fujian Medical University,Fuzhou 350002,Fujian Province,China)

机构地区：[1]福建医科大学附属口腔医院,福建省福州市350002

出　　处：《中国组织工程研究》2022年第27期4374-4378,共5页Chinese Journal of Tissue Engineering Research

基　　金：福建省教育厅资助高校专项科研项目(JT180209),项目负责人:陈熙。

摘　　要：背景:有研究人员指出,瓷边缘设计可很好地解决金瓷冠在前牙修复中出现的“龈黑线”问题,但目前的力学研究方法无法模拟金瓷冠在口腔环境中受湿润环境和疲劳影响下的真实强度。目的:通过测试瓷边缘与常规冠边缘设计的钴铬合金金属烤瓷冠在模拟口腔环境下的疲劳寿命与强度,来探讨瓷边缘设计烤瓷冠的临床适用性。方法:制作60个钴铬合金金属烤瓷冠,其中A组(n=20)金属基底冠唇侧边缘止于肩台中部(常规设计),B组(n=20)金属基底冠唇侧边缘止于肩台与轴壁交界处,C组(n=20)金属基底冠唇侧边缘止于肩台与轴壁交界冠方1 mm处。将所有样本浸泡于人工唾液中,置于37℃恒温环境浸泡24 h,随后在电磁疲劳试验机上以50 N的加载力对样本进行疲劳循环,分别在75万次、150万次后取下,观察样本表面情况。将未崩瓷的样本转移到万能材料测试机上静态加载直至崩瓷,记录每个样本崩瓷时刻所承受的载荷力值。结果与结论:①循环75万次及150万次时所有试件均未出现崩瓷现象,所有烤瓷冠表面均未观察到裂纹;②A组试件平均载荷力值最大,约为1785 N;B组试件平均载荷力值次之,约为1426 N;C组试件平均载荷力值最小,约为1134 N;3组试件载荷值比较差异有显著性意义(P<0.05);③结果提示,3种边缘设计的烤瓷冠疲劳寿命均达到10年以上,其强度也能满足正常咬合需求。BACKGROUND:Some researchers have pointed out that the porcelain edge design can well solve the problem of“gingival black line”of metal ceramic crown in anterior tooth restoration,but the mechanical research methods used to test its strength cannot simulate the real strength of metal ceramic crown under the influence of humid environment and fatigue in oral environment.OBJECTIVE:To discuss clinical suitability of porcelain crowns with porcelain edge design by comparing the fatigue life and strength of cobalt-chromium metal crowns with porcelain edge design in simulated oral environment.METHODS:Sixty cobalt-chromium metal crowns were prepared.The cobalt-chromium metal porcelain crowns with the metal abutment edge ending at the middle of the shoulder(conventional design)were considered as group A(n=20);the metal abutment edge ending at the junction of the shoulder and the axial wall was considered as group B(n=20);and the metal abutment edge ending 1 mm above the junction of the shoulder and the axial wall was considered as group C(n=20).All samples were immersed in artificial saliva and placed at a constant temperature of 37℃for 24 hours.Subsequently,the samples were subjected to fatigue cycles on an electromagnetic fatigue tester with a loading force of 50 N.The samples were removed after 0.75 million and 1.5 million cycles respectively,to observe the surface condition.The samples without porcelain breaking were transferred to the universal material testing machine for static loading until porcelain breaking and the load force borne by each sample at the time of porcelain breaking was recorded.RESULTS AND CONCLUSION:(1)After 0.75 million and 1.5 million cycles,porcelain breaking was not observed in all specimens and no cracks were observed on the surface of all porcelain crowns.(2)The average load force value of the specimens in group A was the largest,about 1785 N;the average load force value of the specimens in group B was the second,about 1426 N;the average load force value of the specimens in group C was

关 键 词：金属烤瓷冠 钴铬合金 疲劳实验 静态加载 瓷边缘 龈黑线 

分 类 号：R459.9[医药卫生—治疗学] R318[医药卫生—临床医学]