Trial manufacture of the water jet equipment for the cavity formation and the tooth pulp removal.

1.空气喷射设备或水喷射设备的喷射声非常小，由于设备没有引起恐惧心的高频声音，预计可以大大降低患者的恐惧心。测量结果表明，在调高调小的情况下，涡轮噪声较大，噪声的体积变化也能观察到。水射流的降噪效果明显优于发动机。研究了用水射流技术去除软化牙本质或去除黏附的牙水泥和修复的复合树脂的可能性。高速水被喷射到健康牙齿物质，软化人工牙本质，牙水泥和复合树脂使用紧凑的水射流装置。测量了高速水对每一种材料表面造成的坑的直径和深度，并利用测压元件测量了高速水对每一种材料施加的载荷。当气缸压力为300kgf/cm^2时，所有试件称重约45gf。结果发现，水射流技术是一种选择合适的圆柱体压力（300kgf/cm^2以下），在不过度研磨健康牙物质的情况下，有选择地去除龋病和粘附在牙齿上的水泥或复合树脂的方法。

1.Jetting sound of an airbrasion equipment or an water jet equipment is very small, and it is expected that the fear heart of the patient by sound can be considerably reduced, since the equipment did not have the high frequent sound which induces the fear heart. As a result of the measurement, the noise of the turbine is big and the volume change of the noise could be observed even if law and high are switched. The water jet shows small value further than the engine and then it is effective in the noise reduction.2.The possibility of using a water-jet technique for removing softened dentin or for deleting adhered dental cements and restored composite resins was investigated. High-speed water was jetted to healthy tooth substances, softened artificial dentin, dental cements and composite resins using a compact water-jet device. The diameter and depth of the pit performed by high-speed water on the surface of each material were measured and the load applied to each material by high-speed water was measured using a load cell. When cylinder pressure was 300kgf/cm^2, all test specimens were weighted at about 45gf. As a result, it was found that water-jet technique is a method of selectively removing dental caries and the cement or composite resin adhering to teeth without over-grinding the healthy tooth substance when the proper cylinder pressure (under 300kgf/cm^2) is chosen.