제Ⅳ형 근관에서 System B Plugger tip의 깊이에 따른 근관 충전 효과 = THE EFFECT OF CANAL OBTURATION ACCORDING TO THE DEPTH OF THE SYSTEM B PLUGGER TIP IN THE TYPE Ⅳ CANAL

다국어 초록 (Multilingual Abstract)

The purpose of this study was to evaluate the effect of the apical sealing according to the depth of the System B Plugger tip when root canal was filled with gutta-percha and sealer by Continuous Wave of Condensation technique in the Type Ⅳ canal.
50 simulated resin blocks with J-shaped curvature canals were instrumented by ProTaper (Dentsply Maillefer, Ballagiues, Switzerland) Ni-Ti files using the crown-down technique. Type Ⅳ canals were made using a broken ProTaper F3 Ni-Ti file for making a ledge at 3mm short from the working length. And ProTaper F1 Ni-Ti file was used for perforating resin block.
The prepared Type Ⅳ canals were randomly divided into three experimental groups of 15 each according to the depth of System B Plugger tip.
All of experimental groups were obturated with Continuous Wave of Condensation technique. The length of gutta-percha and sealer in lingual of the Type Ⅳ canals was measured with a measuring digital calliper under magnifying glass (x 2.3).
The results are as follows :
1. In control group, there was no gutta-percha and sealer in lingual canal.
2. 3 mm group showed relatively more gutta-percha than 5mm or 7 mm group (p<0.05)
3. 7 mm group did not showed gutta-percha and relatively more void were observed than 3mm or 5 mm group. (p<0.05)
In conclusion, within the limits of the results of this experiment, the 3 mm depth of System B Plugger tip was acceptable for obturating the Type Ⅳ canal.

국문 초록 (Abstract)

본 연구의 목적은 제 Ⅳ형 근관에서 Continuous Wave 가압법을 이용하여 충전할 때 System B Plugger tip의 깊이에 따른 근단부 밀폐효과를 평가하기 위함이다.
50개의 J형 만곡을 갖는 레진 블록에 부러진 F3 ProTaper파일을 이용해 근관장에서 3mm 지점에 ledge를 형성한 후, F1ProTaper Ni-Ti file을 이용해 레진 블록을 천공시켜 제 Ⅳ형 근관을 형성하고 System B Plugger tip의 깊이에 따라 3개의 실험군과 1개의 대조군으로 분류하였다.
제 Ⅳ형 근관의 거터퍼쳐와 실러의 길이는 확대경하에서 캘리퍼를 이용해 측정하였고 다음과 같은 결과를 얻었다.
1. 대조군의 설측 근관에서 거터퍼쳐와 실러 모두 관찰되지 않았다.
2. 3 mm군에서는 5mm또는 7mm군에 비해 유의하게 많은 거터퍼쳐의 충전이 관찰되었다 (p<0.05).
3. 7 mm군에서는 유의하게 많은 빈 공간이 관찰되었다 (p<0.05).

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