하악 대구치 근심근관에 대한 전자근관장 측정기의 정확도 = AN ACCURACY OF THE SEVERAL ELECTRONIC APEX LOCATORS ON THE MESIAL ROOT CANAL OF THE MANDIBULAR MOLAR

국문 초록 (Abstract)

근단부위 형성이 완료되고 우식이 없는 하악 대구치 근심치근 50개를 대상으로 주파수 의존형 전자근관장 측정기를 이용하여 측정한 근관장의 정확도를 평가하기 위해 치수강 개방 후 동일한 치아에서 방사선 사진으로 확인한 실측 근관장을 대조군, 각종 전자근관장 측정기로 측정한 근관장을 실험군 (Ⅰ군: Root-ZX, Ⅱ군: Bingo, Ⅲ군: Propex, Ⅳ군: Diagnostic)으로 분류하여 근심협측과 설측의 근관장을 근관의 입구 측으로부터 치근단 1/3까지 확대여부 및 서로 다른 측정시기에 비교 평가한 결과 다음과 같은 결론을 얻었다.
하악 대구치 근심치근의 협측과 전자근관장은 측정기의 종류, 근관의 입구 측으로부터 치근단 1/3까지의 확대여부 및 측정시기에 상관없이 0.5 ㎜ 이내의 오차범위를 나타내었으며, 근관치료시 오차한계인 ± 1 ㎜ 에서 정확성은 근관의 입구 측으로부터 치근단 1/3까지 미리 확대한 후에 근관장을 측정할 경우와 측정시기가 반복될 경우에 증가되는 경향을 보여 임상에 유용하게 활용할 수 있을 것으로 사료된다.

다국어 초록 (Multilingual Abstract)

The aim of this study was to compare the length between the mesio-buccal and mesio-lingual canal of the mandibular molars before and after early coronal flaring at the different measuring time using several electronic apex locators. Fifty mandibular molars with complete apical formation and patent foramens were selected. After establishing the initial working length of the buccal and lingual canal of the mesial root using a surgical microscope (Carl Zeiss Co. Germany) at 25X with #15 K-file tip just visible at the foramen, radiographs were taken for the working length. After measuring the length of mesio-buccal and mesio-lingual canal (control group), the electronic lengths were measured at different times using several electronic apex locators (experimental groups; Ⅰ-Root ZX, Ⅱ-Bingo, Ⅲ-Propex, Ⅳ- Diagnostic). After early coronal flaring using the K^(3) file, the additional electronic lengths were measured using the same manner.
The results were as follows: One canal has a correct working length for the mesial root of the mandibular molar, it can be used effectively for measuring the electronic working length of another canal when the files are superimposed or encountered at the apex. In addition, the accuracy of the electronic apex locators was increased as the measurement was accomplished after the early coronal flaring of the root canal and the measuring time was repeated.

참고문헌 (Reference)

1 "참 고 문 헌"

2 "Twenty years of endodontic success and failure" 198-, 91983

3 "The relationship of the apical foramen to the anatomic apex of the tooth root" 262-267, 341972

4 "The effectiveness of obturating techniques in sealing isthmuses" 26 : 499-506, 2001

5 "The effectiveness of obturating techniques in sealing isthmuses" 26 : 499-506, 2001

6 "The dependence of pulp therapy on certain factors:an analytic study based on radiographic and clinical follow-up examinations" 1-, 141956

7 "The accuracy of the frequency dependent type apex locator" 21 : 150-160, 1996

8 "Stereomicroscopic study of 700 root apices of maxillary and mandibular posterior teeth" 13 : 728-733, 1960

9 "Root canal morphology of the human mandibular first molar" 778-784, 321971

10 "Reliability of radiographic interpretations" 38 : 287-293, 1974

11 "Periapical tissue reactions of root canal instrumentation beyond the apex" 36 : 275-, 1973

12 "Pathways of the pulp" CV Mosby 248-251, 1998

13 "New method for measuring working lengths of root canal" 42 : 375-378, 1962

14 "New Electronic canal length measuring device on the ratio method" 111-114, 201994

15 "Morphology of the pulp cavity of the permanent teeth" 8 : 743-759, 1955

16 "Microcopic investigation of root apexes" 50 : 544-552, 1955

17 "Mesiodistal and buccolingual roentgenographic investigation of 7225 root canals" 101-110, 331972

18 "In vivo evaluation of accuracy of two electronic apex locators" 21 : 289-299, 1996

19 "In vitro evaluation of the reliability of the Endex electronic apex locator" 24 : 120-, 1998

20 "In viro evaluation of the accuracy of several electronic apex locators" 21 : 572-, 1995

21 "Factors affecting the long-term results of endodontic treatment" 16 : 498-, 1990

22 "Factors affecting successful repair after RCT" 67 : 651-, 1963

23 "Experimental study on iontophoresis" 16 : 411-417, 1942

24 "Effect of preflaring on tactile detection of the apical constriction" 21 : 92-, 1995

25 "Conductos Radiculares" editorial medico-quirurgica : 1944-, Aires

26 "Clinical investigation of measuring working lengths of root canals with an electronic device with digital tactile sense" 90 : 379-, 1975

27 "Change in working length following instrumentation of molar canals" 41 : 114-, 1976

28 "Biologic aspects of endodontics Periapical tissue reactions to root canal instrumentation beyond the apex and root canal fillings short of and beyond the apex" solta (solta): 725-737, 1973

29 "Apical root anatomy of human maxillary central incisors" 30 : 694-699, 1970

30 "Apical foraminal openings in human teeth" 79 : 769-777, 1995

31 "An in vivo evaluation of endex electronic apex locator" 177-179, 191993

32 "An in vivo evaluation of an electronic apex locator that uses the ratio method in vital and necrotic canals" 24 : 48-, 1998

33 "An in vivo comparison of gradient and absolute impedance electronic apex locators" 22 : 260-, 1996

34 "An in vitro test of simplified model to demonstrate the operation of electronic root canal measuring devices" 20 : 605-606, 1994

35 "An in vitro evaluation of the accuracy of Root ZX electronic apex locator" 23 : 339-345, 1998

36 "An in Vivo Evaluation of Root ZX Electronic Apex Locator" 22 : 616-618, 1996

37 "An experimental study of the principle of electronic root canal measurement J Endod 13" 1987

38 "A study on the accuracy of the Root-ZX according to the various conditions of root canals" 25 : 474-481, 2000

39 "A study on the accuracy of the ROOT-ZX in the canal with mechanically formed constriction" 24 : 628-632, 1999

40 "A stereomicroscopic study of the root apices of 400 maxillary and mandibular posterior teeth" 9 : 1224-1232, 1956

41 "A clinical evaluation of five electronic root canal length measuring instruments" 16 : 446-449, 1990

42 "A SEM study of in vivo accuracy of the Root ZX electronic apex locator" 24 : 438-, 1998