论文部分内容阅读
用实验方法比较三种常用的缩颈方法及评价锤造全冠的边缘适合性。结果表明各组边缘间隙均大于０．１８０ｍｍ，说明锤造全冠边缘适合性较差，临床检查难以确定其间隙大小。各组近胎面轴壁间隙较小，这与冠成形时此处受力较大，冠周径变小有关，提示临氏上应避免用力和反复锤击此处。各组胎面间隙均大于０．１３０ｍｍ，表明面升高，边缘浮出量较大，冠尚未完全就位。当硬铅代型与缩颈器之间未预留冠套间隙时，所得的锤造全冠适合性更差，面间隙最大（０．９４５ｍｍ）。
Three commonly used methods of necking were compared using experimental methods and the marginal fit of the crown was evaluated. The results showed that the edge clearance of each group were greater than 0.180mm, which shows the inferior edge of the hammer crown fit less difficult to determine the size of the gap in clinical examination. Each group near the tread wall gap is small, which is larger when the crown forming force, the smaller circumference of the crown, suggesting that the Lin should avoid the hard and repeated hammering here. The tread gap of each group is greater than 0.130mm, indicating that the surface increases, the edge of a larger amount of floating, the crown is not yet fully in place. When no crown gap was reserved between the hard lead type and the neck reducer, the resulting full crown fit was even worse with a maximum face clearance of 0.945 mm.