日本东京都一家医疗机械厂制成了一种可诊断早期龋齿的激光探测仪。该探测仪采用10瓦钇铝榴石激光器,照射0.1秒至0.2秒钟以后,再用高速温度探头测定牙齿温度。健全牙齿的表面温度为23～24℃,而有龋齿的部分则升高到30～32℃。另外,观察从侧面照 Tokyo, Japan, a medical machinery factory made a diagnosis of early dental caries laser detector. The detector uses a 10-watt yttrium aluminum garnet laser, irradiation 0.1 seconds to 0.2 seconds later, and then use the high-speed temperature probe to determine the tooth temperature. The surface temperature of a healthy tooth is 23 to 24 ° C, while that of a carious tooth is raised to 30 to 32 ° C. In addition, observe from the side view