Methods A-mong the 202 cases with NPG alloys, nicked - chromiun alloys or metal ceramics dentures, the function and oudook of the dentures and the oral health were studied.

• 方法以修复体功能与外观及口内组织的健康情况为评价指标,观察202例分别用NPG合金、镍铬合金、金瓷冠桥修复的临床效果。