Stein Steffen, Gente Michael
Biomed Tech (Berl). 2013 Oct;58(5):469-74. doi: 10.1515/bmt-2013-0031.
It is necessary to reduce the tooth substance before treating a tooth with a dental crown. The preparation often requires reduction of the dentin. This results in a dentin wound and a thinner substance over the pulp, increases the risk of inflammation, and could result in necrosis of the pulp. To give the dentist information about the amount of dentin over the pulp during preparation, the Prepometer was developed. The function of this device is based on the measurement of the electric resistance of the tooth substance. The measuring behavior of the first-generation Prepometer is characterized by smaller values of electric resistance before reaching full contact of the measuring head to the dentin surface and the actual value RT. This measuring behavior can mislead inexperienced therapists with inaccurate values that suggest thinner dentin than the reality. In this study, a new electrode based on the technology of active guard drive was constructed to overcome this issue. The results show that improvement in the measuring behavior of the new electrode could be achieved, eliminating the earlier disadvantage of the Prepometer.
在使用牙冠治疗牙齿之前，有必要对牙体组织进行磨除。这种预备操作通常需要磨除牙本质。这会导致牙本质创伤，使牙髓上方的牙体组织变薄，增加炎症风险，并可能导致牙髓坏死。为了在预备过程中为牙医提供关于牙髓上方牙本质量的信息，研发了Prepometer。该设备的功能基于对牙体组织电阻的测量。第一代Prepometer的测量行为特点是，在测量头与牙本质表面完全接触并达到实际值RT之前，电阻值较小。这种测量行为可能会误导经验不足的治疗师，因为不准确的值表明牙本质比实际情况更薄。在本研究中，基于有源保护驱动技术构建了一种新电极，以克服这一问题。结果表明，新电极的测量行为得到了改善，消除了Prepometer先前的缺点。
