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.
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.
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 denti...
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.
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.
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가설 설정
This study investigated whether short-term application of calcium hydroxide in the root canal system for 1 and 4 weeks affects the fracture strength of human permanent teeth. The results showed that the calcium hydroxide placed in the root canal for 4 weeks weakened the strength of the root dentin approximately by 8.
제안 방법
However, there are a few limitations in this study. The major limitation of this study is that the method could not reproduce clinical situations. In the present study, each tooth was embedded in acrylic resin cylinder block to the cemento-enamel junction.
The strength of the teeth can be measured using the fracture strength test. The purpose of this study is to determine whether short-term application of calcium hydroxide in the root canal system for 1 and 4 weeks affects the fracture strength of human permanent teeth. The null hypothesis is that it can reduce the fracture strength of human permanent teeth with increasing storage time.
25% NaOCl. Then the teeth were assigned to two groups randomly, control and experimental group, and subdivided into 1 week test and 4 weeks test group with 8 teeth in each group.
This study used 32 mature human single rooted mandibular premolars in similar size and dentin thickness without decay or restorations, which had been extracted in orthodontic clinic. Radiographics were taken in both mesiodistal and buccolingual views to measure the size and dentin thickness.
데이터처리
The samples were fixed into a vice and the load was applied at the cement-enamel junction at 90º angle to long axis of the tooth at 5 mm/min by cross-head speed (Figure 1). 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.
성능/효과
There was no statistically significant difference between experimental groups and between time intervals. After 4 weeks, the mean fracture strength of calcium hydroxide treatment groups reduced approximately by 8.2% compared to no treatment groups: an average of 39.23 MPa for no treatment and 36.01 MPa for CH group. However, there was no statistically significant difference (p > 0.
This is one of a few studies to examine whether short-term application of calcium hydroxide in the root canal system for 1 and 4 weeks affects the fracture strength of human permanent teeth. In this study, after 4 weeks, the mean fracture strength of calcium hydroxide treatment groups reduced approximately by 8.2% compared to no treatment groups. However, there was no statistically significant difference.
7 These findings may be of importance in the decision of treatment plans for teeth with pulp necrosis and immature root formation. The results of these studies confirmed the view that long-term exposure of root dentin to calcium hydroxide may affect its physical properties.
This study investigated whether short-term application of calcium hydroxide in the root canal system for 1 and 4 weeks affects the fracture strength of human permanent teeth. The results showed that the calcium hydroxide placed in the root canal for 4 weeks weakened the strength of the root dentin approximately by 8.2% compared to the control group (no treatment). Though the results of this study confirm the results of the previous studies, the decrease rate of the fracture strength is not as much as the results of the previous studies.
후속연구
In conclusion, these result suggest that short term calcium hydroxide application is available during endodontic treatment. Further research will be required using the method applicable to clinical situations with PDL simulation, forces applied in a different manner and a different direction and with minimum examiner’s error.
참고문헌 (17)
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