Five-axis laser milling system that realizes more accurate zirconia CAD/CAM crowns by direct milling from fully sintered blocks
Five-axis laser milling system that realizes more accurate zirconia CAD/CAM crowns by direct milling from fully sintered blocks
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DOI：
10.4012/dmj.2017-443
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发表时间：
2019-02-01
影响因子：
2.5
通讯作者：
Terada, Kazuto
中科院分区：
文献类型：
--
作者：
Ohkuma, Kazuo;Kameda, Takashi;Terada, Kazuto
研究了利用五轴激光铣削系统直接铣削全烧结氧化锆块体的计算机辅助设计(CAD)/计算机辅助制造（CAM）王冠，并与三轴铣削和加热铣削半烧结王冠的全烧结方法进行了比较。各组氧化锆试件的力学特性相似。边缘间隙的大小顺序为三轴>常规组（舌厚1.5 mm>0.5 mm）>五轴组（接近于零）。所有组的边缘形状几乎都是完美的圆形。内角形状和间隙几乎完美的五轴铣削冠，而不是传统和三轴冠。在五轴铣削组中，边缘和内部形状的圆度几乎是完美的，而在三轴和常规组中则不是。这些微小的扭曲导致了巨大的边际差距。本研究结果表明，五轴铣削系统在制造氧化锆假体方面具有优越性。
Directly milling zirconia computer-aided design (CAD)/computer-aided manufacturing (CAM) crowns from fully sintered zirconia blocks using a five-axis laser milling system, compared with three-axis milling and full sintering by heating milled semi-sintered crowns, was investigated. The mechanical characteristics of zirconia specimens were similar across groups. The order of the marginal gap was three-axis>conventional (lingual thickness of 1.5 mm>0.5 mm)>five-axis group (close to zero). The marginal shape was almost perfectly circular in all groups. The internal corner shape and gap were almost perfect for the five-axis milled crown but not for conventional and three-axis crowns. The roundness of the marginal and internal shapes was almost perfect in the five-axis milling group but not for the three-axis and conventional groups. These small distortions result in large marginal gaps. Results of the present study suggest the superiority of the five-axis milling system in creating a zirconia prosthesis.