Can Fiber Application Affect the Fracture Strength of Endodontically Treated Teeth Restored with a Low Viscosity Bulk-Fill Composite?

Evrim Eliguzeloglu Dalkılıç,Magrur Kazak,Nazmiye Donmez,Duygu Hisarbeyli,Mehmet Ali Fildisi,Hacer Deniz Arısu

doi:10.1155/2019/3126931

Evrim Eliguzeloglu Dalkılıç, Magrur Kazak + Show 4 more

Open Access

https://doi.org/10.1155/2019/3126931

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Abstract

Objective The aim of this study is to evaluate the effects of different fiber insertion techniques and thermomechanical aging on the fracture resistance of endodontically treated mandibular premolar teeth restored using bulk-fill composites. Materials and Methods Eighty human mandibular premolar teeth were randomly divided into eight groups: Group IN, Group BF, Group PRF1, Group PRF2, Group IN-TMA, Group BF-TMA, Group PRF1-TMA ,and Group PRF2-TMA. Group IN (intact) and Group IN-TMA (intact but subjected to thermomechanical aging) served as control groups. In the other six groups, endodontic treatment was performed and standardized mesio-occluso-distal (MOD) cavities were prepared. In BF, PRF1, and PRF2, the cavities were restored with bulk-fill composite only, bulk-fill/Ribbond, and bulk-fill/additional Ribbond, respectively. In BF-TMA, PRF1-TMA, and PRF2-TMA, the teeth were subjected to thermomechanical aging after the restorations. All of the teeth were fractured on the universal testing machine. Fracture surfaces were analyzed with a stereomicroscope. Results Control groups showed significantly higher fracture strengths than tested groups (P<0.05). No statistically significant difference was observed among the tested groups (P>0.05). Most of the favorable fractures were seen in PRF1, PRF2, and PRF2-TMA. Most of the unfavorable fractures were seen in BF-TMA. Conclusions Although fiber insertion with different techniques did not increase the fracture strength of teeth restored with bulk-fill composites, it increased the favorable fracture modes. Thermomechanical aging did not change the fracture strength of the groups.

Highlights

The restoration of endodontically treated teeth (ETT) is an important final step for successful root canal therapy
In terms of failure mode, the highest percentage of favorable fractures in the groups was observed in Group Polyethylene Ribbond Fiber 1 (PRF1) (Figure 2(a)), followed by Group prf2 (Figure 2(b)) and Group Polyethylene Ribbond Fiber 2 (PRF2)-Thermo-mechanical Aging (TMA) (Figure 2(c))
Most of the unfavorable fractures were seen in Group Bulk-fill Thermomechanical Aging (BF-TMA) (Figure 2(d))

Summary

Introduction

The restoration of endodontically treated teeth (ETT) is an important final step for successful root canal therapy. The literature concerning how bonded restorations can fortify weakened teeth is inconsistent [2,3,4,5]. Many in vitro studies have shown that directly bonded restorations can fortify the tooth against fracture [2, 3]. Given the recent developments in composite materials, it is possible to create conservative and highly esthetic restorations. One such improvement is the bulk-fill composites. The potential advantage of these bulk-fill composites is that they can make clinical techniques simpler and faster, in ETT with wide cavity restoration

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