Dentinal crack formation after root canal preparation: Rotary versus reciprocal instrumentation

Abstract

Background: The aim of this investigation was to compare the incidence of dentinal crack after preparation with reciprocating (Reciproc and WaveOne) and full-sequence rotary (ProTaper Next and ProTaper Universal) instruments.

 

Methods: Seventy-five mandibular central incisors were selected and stored in distilled water until use. Fifteen unprepared teeth were served as a negative control group and the remaining 60 teeth were prepared by using full-sequence rotary and reciprocating instruments. After preparation, the teeth were horizontally sectioned at 3, 6 and 9 mm from the apex with a low-speed saw under water-cooling. All slices were viewed through a stereomicroscope and pictures were taken. The presence of dentinal crack was noted and analyzed by used the chi-square test.

 

Results: The control group had no dentinal crack. All root canal preparation with both rotary and reciprocating instruments resulted in dentinal crack. In the 3 mm section PU produced significantly more dentinal crack than the other groups. The PN group produced significantly more dentinal crack in the 6 mm sections than the other sections.

 

Conclusion: All the instruments used in the study were related to the formation of cracks in the canal walls.

Keywords

• Dentinal crack,ProTaper,reciprocal,rotary instrument

Dönme ve resiprokal hareket yapan eğe sistemlerinin kök kanal tedavisi sonrası dentin çatlağı oluşumuna etkisi

Abstract

Amaç: Bu çalışmanın amacı resiprokal ve dönme hareketi yapan eğe sistemlerinin preparasyon sonrası dentin çatlağı oluşumuna etkilerinin kıyaslanmasıdır.

 

Gereç ve Yöntemler: 75 adet mandibular santral kesici diş seçilmiş ve distile su içerisinde çalışmada kullanılıncaya kadar muhafaza edilmiştir. 15 adet diş preparasyon yapılmaksızın negatif kontrol grubu olarak ayrılmış, geri kalan 60 diş dönme ve resiprokal hareketi yapan sistemler kullanılarak prepare edilmiştir. Sonrasında bütün dişlerden, apekslerinden itibaren 3, 6, 9 mm mesafelerden su soğutması altında düşük hızlı testere ile yatay olarak kesitler alınmıştır. Bütün kesitler stereomikroskop yardımı ile incelenmiş ve görüntüler kaydedilmiştir. Üzerinde çatlak bulunan dişler not edilmiş ve ki-kare testi kullanılarak analiz edilmiştir.

 

Bulgular: Kontrol grubundaki örneklerin hiçbirinde çatlak yoktu. Prepare edilen diğer gruplarda ise çatlak varlığı tespit edildi. 3 mm’lik kesitlerde PU grubunda diğer gruplara kıyasla daha fazla çatlak tespit edildi. PN grubunun 6 mm’lik kesitinde diğer kesitlerine kıyasla daha fazla çatlak tespit edildi.

 

Sonuç: Bu çalışmada kullanılan bütün eğe yöntemlerinin kanal duvarlarında çatlak oluşturduğu tespit edilmiştir.

Keywords

• Dentin çatlağı,ProTaper,resiprokal,dönen alet

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