5 m×110 m,has run for ten years,surface of each supporting ring has been flaked off and has crack on it.
5m×110m熟料窑,经10多年的使用,其各档领圈均存在一定程度的表面剥落或裂纹损伤。
Study of dual metal ferrule in the restoration of post and core crown;
双重金属领圈在桩核冠修复治疗中的临床研究
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