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收集41例金属烤瓷修复体及剥脱的病例，结合临床分析造成的原因和机制。找出失败的因素总结金瓷之间良好结合的正确有效制作方法，避免修复后瓷裂剥脱的问题发生。“,”Forty-one cases of porcelain-fused-to-matal(PFM) porcelainvenecred and dnudation were collected, to study the cause and mechanism by clinical research. The treatment failure factors and the effective methods to make porcelain were found, to avoid the venecred and denudation after repair.