Biagioni P A, Hussey D, Mitchell C A, Russell D M, Lamey P J
Division of Oral Medicine, School of Clinical Dentistry, Queen's University of Belfast, Royal Victoria Hospital, UK.
J Dent. 1996 Nov;24(6):443-7. doi: 10.1016/s0300-5712(96)80481-7.
This in-vitro study aimed to examine the change in surface temperature induced by the actions of drills for the placement of dentine pins.
Ten decoronated extracted premolar teeth were embedded by the apical tip of their roots in orthoresin. They were held in a bench vice and allowed to reach the ambient temperature of 24 degrees C. A thermal imaging camera, Agema Thermovision 900 series, was positioned 0.05 m perpendicular to the decoronated surface. Sequential recording of a series of images was stored at a rate of three per second during each stage of the pin placement procedure. This included a pilot drill, a channel cutting drill and the pin placement. All pins were 0.675 mm diameter x 2 mm in length and were placed 1 mm from the amelo-dentinal junction using a Kavo handpiece rotating at 4000 rpm.
The mean baseline temperature for the thermally stabilized teeth was 23.9 degrees C. The action of the round pilot drill changed the temperature from baseline by 25 degrees C. The action of the channel drill generated the greatest heat, with a mean maximum temperature recorded during these procedures of 94 degrees C +/- 9 degrees C. The pilot drill produced a mean change from baseline of 31.3 degrees C +/- 17.7 degrees C during pin placement.
The placement of dentine pins produced a high temperature increase on the surface of the dentine. All stages of pin placement gave rise to an increased temperature, but this was maximal with the channel drill. Further studies are required to determine whether these surfaces temperatures are transferred to the pulpal chamber.
本体外研究旨在检测用于放置牙本质钉的钻头操作所引起的表面温度变化。
将十颗去除冠部的离体前磨牙通过牙根尖端嵌入正畸树脂中。将它们夹在台虎钳中，使其达到24摄氏度的环境温度。一台热成像相机，阿加玛热成像900系列，垂直于去冠表面0.05米处放置。在牙钉放置过程的每个阶段，以每秒三张的速率存储一系列图像的顺序记录。这包括导向钻、通道切割钻和牙钉放置。所有牙钉直径为0.675毫米，长度为2毫米，使用卡瓦手机以4000转/分钟的转速放置在距釉牙本质界1毫米处。
热稳定牙齿的平均基线温度为23.9摄氏度。圆形导向钻的操作使温度从基线升高了25摄氏度。通道钻产生的热量最大，在这些操作过程中记录的平均最高温度为94摄氏度±9摄氏度。在牙钉放置过程中，导向钻使基线温度平均变化31.3摄氏度±17.7摄氏度。
牙本质钉的放置使牙本质表面温度大幅升高。牙钉放置的所有阶段都会导致温度升高，但通道钻导致的温度升高最大。需要进一步研究来确定这些表面温度是否会传递到牙髓腔。
