抜去歯の模擬側方管における受動的超音波潅流と連続的超音波潅流のin vitro比較

In vitro comparison of passive and continuous ultrasonic irrigation in simulated lateral canals of extracted teeth.

抄録

はじめに:

歯内療法システムの完全な消毒には、活歯髄組織、壊死歯髄組織、微生物、および毒素の除去が必要である。本研究の目的は、抜去歯の主管および模擬側管への次亜塩素酸ナトリウムの浸透に対する2つの超音波灌流法の効果を比較することである。

INTRODUCTION: Complete endodontic system disinfection requires the removal of vital and necrotic pulp tissue, microorganisms, and toxins. The purpose of this study was to compare the effects of 2 ultrasonic irrigation techniques on the penetration of sodium hypochlorite into the main canal and simulated lateral canals of extracted teeth.

方法:

60本の単根歯（6管/歯、n = 360）に、作業長から2mm、4mm、6mmの模擬側管をそれぞれ2本ずつ作成した。臨床状況に類似させるため、各歯に閉鎖系を作成した。歯は3つの実験的潅注群に無作為に割り付けられた：第1群（n = 20）は陽圧潅注（PPI）、第2群（n = 20）は受動的超音波潅注（PUI）、第3群（n = 20）は連続的超音波潅注（CUI）。試料は、歯科用手術顕微鏡で記録した静止画像を直接観察して評価した。灌流液の浸透性を調べるため、5%次亜塩素酸ナトリウム溶液に20%中国墨（Sanford Rotring GmbH, Hamburg, Germany）を添加し、根管内に投与した。

METHODS: Two simulated lateral canals each were created 2, 4, and 6 mm from the working length in 60 single-rooted teeth (6 canals/tooth, n = 360). To resemble the clinical situation, a closed system was created in each tooth. The teeth were randomly assigned to 3 experimental irrigation groups: group 1 (n = 20), positive pressure irrigation (PPI); group 2 (n = 20), passive ultrasonic irrigation (PUI); and group 3 (n = 20), continuous ultrasonic irrigation (CUI). Samples were evaluated by direct observation of still images recorded under a dental operating microscope. To examine irrigating solution penetration, 20% Chinese ink (Sanford Rotring GmbH, Hamburg, Germany) was added to a 5% sodium hypochlorite solution and delivered into the root canals.

結果:

その結果、CUI群では側管への潅注液の浸透性が有意に高かった（P < 0.05）。PUIとCUIでは、主管の先端3分の1への溶液の浸透に有意差はなかった。PPI群では、CUI群およびPUI群と比較して、主管および側管への次亜塩素酸ナトリウムの浸透が有意に低かった。

RESULTS: The results showed a significantly higher (P < .05) penetration of irrigant into the lateral canals in the CUI group. PUI and CUI did not differ significantly in solution penetration into the apical thirds of the main canals. The PPI group showed a significantly lower penetration of sodium hypochlorite into the main and lateral canals compared with the CUI and PUI groups.

結論:

最終すすぎとしてのCUIは、模擬側管への潅注液の浸透を有意に増加させた。

CONCLUSIONS: CUI as a final rinse significantly increased the penetration of irrigating solution into simulated lateral canals.