EFFECT OF POTASSIUM ION ON INTRADENTAL NERVE ACITIVITY

칼륨이온이 치수내 신경활동에 미치는 영향

  • Son, Ho-Hyun (Depts. of Conservative Dentistry, College of Dentistry, Chonbuk National University) ;
  • Park, Soo-Joung (Depts. of Oral Physiology, College of Dentistry, Chonbuk National University) ;
  • Lee, Kwang-Won (Depts. of Conservative Dentistry, College of Dentistry, Chonbuk National University)
  • 손호현 (전북대학교 치과대학 치과보존학교실) ;
  • 박수정 (전북대학교 치과대학 구강생리학교실) ;
  • 이광원 (전북대학교 치과대학 치과보존학교실)
  • Published : 1992.03.31

Abstract

The intradental nerve activity was recorded from single pulp nerve unit dissected from the inferior alveolar nerve in canine teeth of anesthetized cats. The effects of various test solutions on intradental nerve activity evoked by 4M NaCl applied to the deep dentinal cavities were investigated. 1. Total 15 single pulp nerve units were recorded. Of these 9 were Mi - fibers and 6 were C -fibers. The mean conduction velocity and electrical threshold of $A{\delta}$ - fiber were $6.3{\pm}3.7m/sec$, $1.2{\pm}0.7V$ and those of C - fiber were $1.0{\pm}0.2m/sec$, $2.3{\pm}1.3V$, respectively. The response to cold stimuli of $A{\delta}$ - fiber began immediately and that of C - fiber began after a latency. 2. When applied to deep dentinal cavity, 4M NaCl induced irregular bursts of action potential in 4 $A{\delta}$ - fibers and 3 C - fibers, which continued until the solution was washed away. 3. In the $A{\delta}$ - fiber, histamine failed to induce any nerve acitivity and did not produce an increase in intradental nerve activity evoked by 4M NaCl. However following the application of 1M KCl, the response to 4M NaCl was eliminated. 4. In the C - fiber, histamine generated some nerve activity and produced a significant increase in intradental nerve activity evoked by 4M NaCl, but 5M $CaCl_2$ did not abolish this enhandced response.

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Acknowledgement

Supported by : 한국학술진흥재단