Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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The effects of short-term application of calcium hydroxide on dentin fracture strength

단기간의 수산화 칼슘 적용이 상아질 파절강도에 미치는 영향

  • Shin, Eun-Jung (Chonnam National University School of dentistry) ;
  • Park, Yeong-Joon (Department of Dental Materials, Chonnam National University School of Dentistry and Dental Science Research Institute) ;
  • Lee, Bin-Na (Department of Conservative Dentistry, Chonnam National University School of Dentistry and Dental Science Research Institute) ;
  • Jang, Ji-Hyun (Department of Conservative Dentistry, Chonnam National University School of Dentistry and Dental Science Research Institute) ;
  • Chang, Hoon-Sang (Department of Conservative Dentistry, Chonnam National University School of Dentistry and Dental Science Research Institute) ;
  • Hwang, In-Nam (Department of Conservative Dentistry, Chonnam National University School of Dentistry and Dental Science Research Institute) ;
  • Oh, Won-Mann (Department of Conservative Dentistry, Chonnam National University School of Dentistry and Dental Science Research Institute) ;
  • Hwang, Yun-Chan (Department of Conservative Dentistry, Chonnam National University School of Dentistry and Dental Science Research Institute)
  • 신은정 (전남대학교 치의학전문대학원) ;
  • 박영준 (전남대학교 치의학전문대학원 치과재료학교실) ;
  • 이빈나 (전남대학교 치의학전문대학원 보존학교실) ;
  • 장지현 (전남대학교 치의학전문대학원 보존학교실) ;
  • 장훈상 (전남대학교 치의학전문대학원 보존학교실) ;
  • 황인남 (전남대학교 치의학전문대학원 보존학교실) ;
  • 오원만 (전남대학교 치의학전문대학원 보존학교실) ;
  • 황윤찬 (전남대학교 치의학전문대학원 보존학교실)
  • Received : 2011.07.21
  • Accepted : 2011.09.02
  • Published : 2011.09.30
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Abstract

Objectives: This in vitro study investigated whether short-term application of calcium hydroxide in the root canal system for 1 and 4 wk affects the fracture strength of human permanent teeth. Materials and Methods: Thirty two mature human single rooted mandibular premolars in similar size and dentin thickness without decay or restorations were hand and rotary instrumented and 16 teeth vertically packed with calcium hydroxide paste and sealed coronally with caviton to imitate the endodontic procedure and the other 16 teeth was left empty as a control group. The apicies of all the samples were sealed with resin, submerged in normal saline and put in a storage box at $37^{\circ}C$ to mimic the oral environment. After 1 and 4 wk, 8 samples out of 16 samples from each group were removed from the storage box and fracture strength test was performed. The maximum load required to fracture the samples was recorded and data were analysed statistically by the two way ANOVA test at 5% significance level. Results: The mean fracture strengths of two groups after 1 wk and 4 wk were similar. The intracanal placement of calcium hydroxide weakened the fracture strength of teeth by 8.2% after 4 wk: an average of 39.23 MPa for no treatment group and 36.01 MPa for CH group. However there was no statistically significant difference between experimental groups and between time intervals. Conclusions: These results suggest that short term calcium hydroxide application is available during endodontic treatment.

연구목적: 인간의 영구치에서 수산화 칼슘을 근관계에 단기간(1주 또는 4주)으로 적용하였을 때 파절강도에 미치는 영향을 알아보고자 하였다. 연구 재료 및 방법: 단일 치근을 가지며, 유사한 크기 및 상아질 두께를 보이고, 우식이나 수복물이 없는 32개의 하악 소구치를 이용하였다. 16개의 치아에는 수산화 칼슘을 충전한 후 임시가봉 하였고, 나머지 16개의 치아는 대조군으로서 충전하지 않은 상태에서 임시가봉 하였다. 모든 시편의 치근단을 레진으로 밀봉한 후, $37^{\circ}C$ 식염수에 보관하였다. 1주와 4주 후에 시편을 파절시키기 위해 필요한 힘의 최대값을 측정하여 통계학적으로 분석하였다. 결과: 1주, 4주 후 두 그룹의 평균 파절강도는 유사하였다. 수산화 칼슘을 근관 내에 4주간 적용한 경우에는 파절강도가 대조군에 비해 8.2% 감소하였다. 그러나 통계학적으로 실험군간, 시간대별 유의한 차이는 보이지 않았다. 결론: 수산화 칼슘을 단기간 적용할 경우 치아의 파절강도에 큰 영향을 미치지 않는다. 따라서, 근관치료 과정 동안 수산화 칼슘을 단기간으로 적용할 수 있다.

Keywords

References

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