The effect of handpiece spray patterns on cutting efficiency
The effect of handpiece spray patterns on cutting efficiency
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DOI：
10.14219/jada.archive.2002.0142
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发表时间：
2002-02-01
影响因子：
3.9
通讯作者：
von Fraunhofer, JA
中科院分区：
文献类型：
--
作者：
Siegel, SC;von Fraunhofer, JA
背景资料。高速手机的喷口在切割界面直接注入冷却液。作者评估了端口的数量和位置对切割率的影响。作者使用已建立的测试方案对可加工陶瓷块进行了切割研究。来自一家制造商的单端口、三端口和四端口手机在每分钟25毫升的水流下以最大扭矩和转速运行。作者在13毫米的横截面上进行了6毫米长的边缘和凹槽切割，为每部手机使用了6个中等粒度的钻石毛刺。每个毛刺总共切割78毫米。作者确定CR作为横断区块的时间，并对数据进行双因素方差分析和随机后Scheffe检验。CRS因切割类型和喷口数量而异。在切边过程中，三种手机的CRS没有发现差异。在切槽过程中，单口手机切割速度明显慢于三口手机和四口手机(P<；.001)。数据表明，在这些研究条件下，手机喷口的数量及其相对于毛刺的位置会影响切割界面的供水，从而影响CR。最佳的切割效率需要良好的冷却液通道，尤其是在受限区域。由于更好的喷水图案，在为牙冠或近端盒准备近端区域时，多端口手机可能是有利的。牙科医生在选择用于袖口操作的手机时，应考虑喷口数量的影响。
Background. High-speed handpieces' spray ports direct coolant at the cutting interface. The authors evaluated the effect of the number of ports and their positions on cutting rates, or CRs.Methods. The authors performed cutting studies on a machinable ceramic block using an established testing regimen. One-port, three-port and four-port hand-pieces from one manufacturer were operated at maximum torque and rotation speed under a water flow of 25 milliliters per minute. The authors made 6-millimeter long edge and groove cuts in 13-mm cross-section blocks using six medium-grit diamond burs for each handpiece. Each bur cut a total of 78 mm. The authors determined CR as the time to transect the block and analyzed the data by two-way analysis of variance with post hoc Scheffe tests.Results. CRs varied by the type of cut and the number of spray ports. No differences were found in CRs for the three handpieces during-edge cutting. The one-port handpiece cut significantly slower (P < .001) than did the three- and four-port handpieces during groove cutting.Conclusion. The data indicate that the number of handpiece spray ports, and their positioning relative to the bur affect water supply to the cutting interface and, consequently, the CR under these study conditions.Clinical implications. Optimal cutting efficiency requires good coolant access, especially within restricted areas. A multiple-port handpiece may be advantageous when preparing the interproximal region for a crown or a proximal box, owing to the better water spray pattern. Dentists should consider the influence of the number of spray ports when selecting handpieces for cuffing procedures.