The operation technic is an important factor for the success of implant as well as the diagnosis, postoperative prognosis and the prosthetic consideration.
In this study, the factors which will affect the heat occurrence and distribution during bone preparation performed on an in vitro mandible model(ribs of pig)were considered.
The factors which were considered were:1)The amount of load placed on the bone through preparating bur;300,500 and 700 g.2) The rotating speed;500 rpm,1,000 rpm and 2,000 rpm.3)The application of water irrigation or not. For bone preparation, a speed adjustable rotating instrument with irrigation was used. A real-time thermography(NIPPON AVIONICS Co., LTD.)was used to observe the temperature and distribution of the heat which occurred in the bone and the temperature of a specific point within the bone were statistically analyzed.
The conclusions are as follows:
1. The effect of various load placed on the bur.
According as the load increased, the amount of heat occurence during preparation increased. For penetrating through the cortical bone, the cutting efficiency of the bur with 300gm load were the lowest and the heat distribution were widely spread out over the cortical bone. On the other hand with 500gm load, the temperature rised as the drilling depth increased within the cancellous bone.
2. The effect of rotating speed.
As the rotating speed of bur increased both in cortical or cancellous bone layer, the temperature rised higher. On the contrary preparation period decreased.
3. The effect of water irrigation.
Preparating the cortical bone, water irrigating showed a significant effect. But not significant incase of cancellous bone.
View full abstract