The Effect of Two Different Root Canal Sealers and Smear Layer on Resistance to Root Fracture

Abstract

The purpose of this in vitro study was to test the effect of Ketac-Endo (KE) and AH 26 on resistance to root fracture and also to evaluate the effect of smear layer. Seventy-two human maxillary canine teeth were randomly divided into six groups (n = 12) and were prepared using six different methods: group 1: KE, without smear layer (smear -); group 2: KE, with smear layer (smear +); group 3: AH 26, smear (-); group 4: AH 26, smear (+); group 5 (negative control): nonprepared; group 6 (positive control): prepared but unfilled. After storing 1 week in 100% humidity at 37 degrees C, the coronal lingual walls and root canal spaces were lowered 2 mm below the buccal walls of the roots. The samples were placed into acrylic resin blocks so that 10 mm of buccal roots were exposed and were placed in a specially designed steel pad at an angle of 15 degrees to the long axis of the root. A slowly increasing force was applied at the junction of the buccal wall and root canal space until fracture occurred. The force required to fracture each tooth was recorded as kg and statistically analyzed using one-way analysis of variance and Duncan tests. The results indicated that instrumentation of the root canals significantly weakened the tooth structure to fracture (p < 0.05). The canals obturated with either sealer were significantly stronger than roots whose canals were instrumented but not obturated (p < 0.05), and there was no difference between the sealers. The presence or absence of the smear layer did not cause any significant effect on the root fracture resistance of the teeth (p > 0.05).

Resistance to fracture of roots filled with different sealers

“…In the present study, no differences in fracture strength were found among roots fi lled with AH Plus, iRoot SP, and MTA Fillapex. The results of this study agreed with those of Karapinar Kazandag et al 5) and and Cobankara et al 30) in that all the experimental groups showed signifi cantly superior fracture resistance than the negative control group. On the other hand, our results contradicted with those of Grande et al 36) and Kim et al 37) , in that they found no clear benefi ts with the use of root canal sealers in improving the fracture resistance of root canal dentin.…”

“…Other favorable features of this sealer include osteoconductivity, hydrophilicity, adhesiveness and chemical bonding to root canal dentinal walls. In several studies, it was shown that chemical bonding to root dentin improved the resistance of endodontically treated teeth against root fractures 7,8,30) . Another newly introduced root canal sealer is MTA Fillapex.…”

Influence of Five Different Root Canal Sealers on Root Fracture Susceptibility

“…Variations in the dimensions of the roots, extraction time, and storage conditions may affect the results. 7 According to Versluis et al 8 root canal preparations that resulted in a round cross-section led to more uniform stress distributions within a root during filling, thereby reducing fracture susceptibility.…”

Bağlama özelliği olan bir kanal dolgu materyali ile veya farklı fiber post tipleri ile restore edilen endodontik tedavili köklerin kırılma dirençlerinin in vitro incelenmesi

“…Bununla birlikte, kuvvetin dişin uzun eksenine dik olarak uygulanmas›n›n kuvvetin uniform olarak iletilmesini sağlad›ğ› bildirilmiştir (25, 26). Bu çal›şmada, örneklerin k›r›lma dirençlerinin değerlendirilmesi için, birçok çal›şmada olduğu gibi (8,27, 28) kuvvet köklere dik yönde uyguland›. Resilon ve Epiphany patlar›n› değerlendi-ren birçok çal›şma vard›r (8,28,33,34 Epiphany sistemi ile postlar› hasta baş›nda harcanan tedavi zaman› aç›s›ndan karş›laşt›rd›-ğ›m›z da post sistemleri ile yap›lan kanal tedavilerinde ilk önce kanal tedavisi yap›l›p tekrar bu kanal›n sökülmesi için ekstra zaman harcanmaktad›r.…”