Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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EFFECT OF CANAL TAPERING IN TEETH OF VARIOUS APICAL SIZE & CROSS-SECTIONAL CONFIGURATION ON MICROLEAKAGE

다양한 치근단공 크기와 근관단면의 형태를 가지는 치아에서 taper의 정도가 미세누출에 미치는 영향

  • Kim, Jung-Hee (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University) ;
  • Lee, Kyung-Ha (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University) ;
  • Lee, Se-Joon (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University) ;
  • Yu, Mi-Kyung (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University) ;
  • Lee, Kwang-Won (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University)
  • 김정희 (전북대학교 치과대학 치과보존학교실) ;
  • 이경하 (전북대학교 치과대학 치과보존학교실) ;
  • 이세준 (전북대학교 치과대학 치과보존학교실) ;
  • 유미경 (전북대학교 치과대학 치과보존학교실) ;
  • 이광원 (전북대학교 치과대학 치과보존학교실)
  • Published : 2005.03.01
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Abstract

The aim of this study was to evaluate the microleakage of teeth according to root canal preparation with & without apical enlargement in various size of apical foramen. 60 extracted one canal roots were cross-cutted at 5 mm from root apex and divided into two groups according to their apical foramen size of large (L) and small (S). Each group was subdivided into two groups accordance with their cross-sectional configuration at 5 mm from apex, round (R) and ovoid (O); SR Group, SO Group LR Group, LO Group. Each group was shaped in .02 taper by Quantec series Nickel-Titanium (NiTi) rotary file, obturated by lateral condensation method. Leakage was measured using a fluid transport model under 40 $cmH_2O$ pressure. After the leakage test, blocks which had showed the leakage retreated with .04 taper and ,06 taper and evaluated the degree of fluid filtration in each group. The data was analysed statistically using chi-square test and fisher's exact test. The results obtained were as follows : 1. Significant difference in leakage was found in groups which had different apical foramen size in .02 taper instrumentation (p < 0.05), but not in .04 taper instrumentation (p > 0.05) 2. The difference in microleakage according to the shape of canal was not evident at 5 mm from apex (p > 0.05). 3. There was correlation between .02 taper instrumentation and .04 taper instrumentation in LR group, LO group (p < 0.05).

이 연구의 목적은 근단공의 크기가 다양한 치아에서 근단공 확대의 유무에 따른 근관성형시 치아의 미세누출을 평가하기 위함이다. 1근관 치아 60개를 치근첨 상방 5mm에서 절단후 각 치아의 근단공 크기에 따라 큰 근단공 (L) 작은 근단공 (S)으로 나누었다 이 두 군을 치근첨 상방 5mm의 횡단면상 근관의 형태로 원형 (R)과 난형 (O)으로 나누었다(SR, SO, LR, LO). 각 군은 Quantec series Nickel-Titanium (Ni-Ti) rotary file을 이용하여 .02 taper로 성형 후 측방가압법으로 충전하였다. 누출은 40 $cmH_2O$ 압력하에 fluid transport method로 측정하였다. 측정 후 누출이 있는 시편은 .04 taper와 .06 taper로 재근관치료 하여 다세 미세누출을 평가하였다. 통계학적으로 chi-square test와 fisher's exact test를 이용하였다. 결과는 다음과 같다. 1. .02 taper로 성형한 군에서는 근단공의 크기에 따른 미세누출은 통계적으로 유의성이 있었고 (p < 0.05) .04 taper로 성형한 군에서는 통계적으로 유의한 차이를 보이지 않았다 (p > 0.05) .2.근첨 상방 5 mm에서 근관단면의 형태에 따른 미세누출은 통계적으로 유의하지 않았다 (p > 0.05). 3. LR group과 LO group에서는 .02 taper로 성형한 군과 .04 taper로 성형한 군사이에 유의한 차이를 보였다 (p < 0.05).

Keywords

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