科研之友
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摘要
Dental rasping with powered dental instruments is frequently performed in equine medicine. Heat production is an adverse effect during the reduction of focal dental overgrowth with rotating instruments and can cause thermal injury of the pulpar tissues and can even lead to pulp necrosis. The extent of heat absorption of the endodontic tissues during dental treatment is therefore of great clinical interest. ZACH and COHEN (1952) demonstrated that an increase of pulpar temperature by 5.5 degrees C can cause irreparable damage. In order to define various characteristics of thermal conduction in equine cheek teeth, it was necessary to standardize the connection of the tooth surface to the heat source, the distance between the dental pulp and the occlusal surface and the position of the temperature sensor within the pulp horns. Measurements on maxillary and mandibular cheek teeth indicated that the distance of a pulp horn to the occlusal surface is a determining and significant factor for heat conduction (p%26lt;0.05). The position of a pulp horn within the dental crown, and thereby the hard substance surrounding it, had no significant influence on the time span of the heating process in the subocclusal pulp horns (p%26gt;0.20). The experimental results were checked for plausibility by means of finite element analysis. The tooth model can be used to check for-harmful heat generation within the tooth pulp when comparing the use of different instruments and techniques.
- 出版日期2013
