Fracture resistance of roots filled with gutta-percha or RealSeal®

Abstract

The lower fracture resistance of roots filled using RealSeal(®) is probably the result of more efficient transmission of forces within the canal, rather than a direct effect of the material itself.

Comparison of the Resistance of Teeth Instrumented with Different Nickel-Titanium Systems to Vertical Root Fracture: An In Vitro Study

“…Although it is difficult to simulate the periodontal ligament perfectly, applying a force parallel to the teeth's long axis makes this model more successful than previously used models (11,23,24). The use of the artificial periodontal ligament in the present study may explain the difference in resistance to VRFs (275 N) in the present study compared with that reported in previous research (242 N) (11).…”

“…Many previous studies have used a similar setup to that used in our study to evaluate the VRF resistance of teeth (11,23,24). Their findings could be correct in terms of the comparison of the effect of the techniques used on VRF resistance.…”

“…Their findings could be correct in terms of the comparison of the effect of the techniques used on VRF resistance. However, we believe that the setup used in the present study is more reliable than the models used in these earlier studies (11,23,24) because the force applied to the teeth was directly reflected from the acrylic because of the absence of any material to mimic the periodontal ligament. Most studies have found that microcrack formation appeared to be associated with VRFs (4, 6, 22); however, a recent study stated that there was no causal relationship between dentinal microcrack formation and canal preparation procedures (25).…”

Influence of Five Different Root Canal Sealers on Root Fracture Susceptibility

“…Their study demonstrated that the sealer type did not significantly influence fracture load with the same core material; the core material was more important in terms of strengthening or reinforcing the root filling. 10 For this reason, was used as the core material to assess the impact of root canal sealers in the current study. For fracture strength measurement, in many studies, loading force was applied in a vertical direction because a vertical force applied parallel to the long axis of a tooth produces a more uniform stress distribution.…”

Device and materials for in vitro evaluation of forces developed to teeth and periodontal structures during dental practices

“…This study’s experimental measurements showed that vertical rather than lateral forces developed are more detrimental throughout the root canal. Other authors experimented using different testing methodologies, such as the Instron testing machine 20,21 and photoelastics. 22 Shemesh et al, 5 in 2010, correlated the forces applied during obturation procedures with the occurrence of dentinal defects.…”