界面粗糙度对双层硅酸锂玻璃陶瓷材料断裂强度的影响  

Influence of interfacial surface roughness on flexural strength of bilayered lithium-disilicate glass ceramics

作　　者：王晓东[1] 张新平[2] 赵克[1] 

机构地区：[1]中山大学光华口腔医学院·附属口腔医院修复科广东省口腔医学重点实验室,广州510055 [2]华南理工大学材料科学与工程学院金属材料科学与工程系

出　　处：《中华医学美学美容杂志》2013年第6期449-452,共4页Chinese Journal of Medical Aesthetics and Cosmetology

基　　金：国家自然科学基金资助项目（编号：81271175）;广东省科技厅承担政府特定任务项目（编号：20118061200024）

摘　　要：目的探讨饰瓷一核瓷界面粗糙度对双层硅酸锂玻璃陶瓷材料断裂强度及失效模式的影响。方法制备IPSe．maxPress单层标准试件40个，最终分别采用1000目（A组）、600目（B组）、320目（C组）碳化硅砂纸打磨及喷砂（D组）4种方法处理饰瓷一核瓷界面，涂塑烧结IPSe．maxCeram饰瓷完成双层试件。三点弯曲实验测定双层全瓷试件断裂强度值，单因素方差分析比较组间差异。使用体视显微镜观察失效模式。结果A、B、c、D4组试件断裂强度值分别为（164．27±15．02）、（159．21±15．72）、（156．14±17．10）、（152．97±15．61）MPa，4组间差异均无统计学意义（P〉O．05）。所有双层试件均在加载头正下方饰瓷内部发生内聚失效，未观察到饰瓷一核瓷界面分层。结论饰瓷一核瓷界面粗糙度对双层硅酸锂玻璃陶瓷材料整体断裂强度无显著影响；其饰瓷与核瓷间可形成较好的结合。Objective To investigate the influence of the core-veneer interfacial surface rough- ness on the flexural strength and failure mode of bilayered lithium-disilicate ceramic structure. Methods Forty IPS e. max Press bar-shaped specimens were fabricated and divided randomly into 4 groups. The core-veneer interracial surfaces of the core materials were ground to specific surface roughness with sil- icon carbide papers of various grits. Specimens of the groups A, B and C were ground by silicon car- bide papers of 1000 grits, 600 grits and 320 grits, respectively. While specimens in group D were sandblasted without any grinding as recommended by the manufacturer＇s instruction. After veneer ap- plication and sintering, the flexural strength of bilayered specimens were measured utilizing three-point bending test, and the failure mode was observed using stereomicroscopy. Results The mean flexura] strength value of bilayered specimens for groups A, B, C and D were （ 164.27±15.02）, （ 159.21±15.72）, （156.14±17.10） and （152.97±15.61） MPa, respectively. However, there was no signifi- cant differences in fracture strength between groups （P〉0.05）. All specimens demonstrated cohesive failure of veneer porcelain right underneath the indenter, without any core-veneer delamination. Con- clusions The influence of core-veneer interfacial surface roughness on flexural strength of bilayer lith- ium-disilicate-based ceramics is not significant. The superior bond between core and veneer provides a reliable interface.

关 键 词：界面粗糙度 牙瓷料 力学性能 失效模式 

分 类 号：R783[医药卫生—口腔医学]