Influence of Different Restorative Techniques on the Strength of Endodontically Treated Weakened Roots

Abstract

Objective. Comparing effect of different restoration techniques on fracture resistance of compromised roots. Methods. Crowns of 100 single-rooted teeth were sectioned and 10 roots were kept as negative control group (Group 1). Remaining roots were instrumented and divided into one and positive control group of 10 samples (Group 2) and 4 experimental groups of 20 samples each. Group 3: roots were obturated with gutta-percha; Group 4: roots were restored with gutta-percha, composite, and glass fiber post; Group 5: roots were obturated with Resilon; Group 6: Roots were restored with Resilon, composite, and glass fiber post. Roots were weakened before obturation in groups 2, 3, and 5 and after obturation in groups 4 and 6. Fracture strengths were measured using Dartec testing machine and fracture load was recorded in kilo-Newton. Statistical analysis was done using ANOVA and Tukeys test. Results. The fractures resistance of restored roots was significantly higher in groups 4, 5, and 6 than in Groups 2 and 3. There were no significant differences between groups 1, 4, 5, and 6. Conclusions. Restoration of weakened roots with Resilon or bonding an intermediate composite resin to coronal radicular dentin and to glass fiber post increased their fracture resistance.

Influence of glass fibre post length and remaining dentine thickness on the fracture resistance of root filled teeth

“…The results revealed no significant difference in fracture resistance values between the groups (NW, MW and HW). Similar behaviour has been reported previously (Silva et al 2011, Zogheib et al 2011, Alsamadani et al 2012, Balkaya & Birdal 2013, Barcellos et al 2013and Amin et al 2014. The techniques of customization of glass fibre posts with composite resin, adopted in this and other studies, may explain the similar results, because the protocols employed were able to match the values of fracture resistance of intact and weakened roots.…”

“…The concern about maintaining weakened teeth in the dental arch, to preserve function and aesthetics, has led to the development of alternatives to improve the retention of glass fibre posts in these roots, thus enabling coronal restoration. There are several methods for the restoration of weakened roots, such as the use of accessory fibre posts, a thick layer of luting cement and the association of composite resin with glass fibre posts to obtain customized well-fitting posts (Zogheib et al 2011, Alsamadani et al 2012, Amin et al 2014, Wandscher et al 2014. The reinforcement of roots may be promoted by the use of composite resin associated with glass fibre posts to form a mono-block inside the weakened root, which could potentially increase its resistance to fracture (Schwartz 2006, Silva et al 2011, Zogheib et al 2011, Seghi et al 2013.…”

Impact of a Core Ferrule Design on Fracture Resistance of Teeth Restored with Cast Post and Core

“…The prognosis of endodontically treated teeth (ETT) is proven to be affected by the type of the restoration [ 1 , 2 ], and in this aspect numerous methods of restoring ETT have been advocated. The traditional approach for restoration of ETT with moderate-to-severe tooth loss is to make a post and core and, subsequently, place a crown [ 3 , 4 ].…”

Fracture Strength of Weakened Anterior Teeth Associated to Different Reconstructive Techniques

“…The restoration of weakened roots with standard glass fiber posts (GFP) may failure as a consequence of misfit since the geometry of the weakened root results in a very wide, tapered, and un-retentive post (6). A thick cement layer can generate bubbles in the cement-post-dentin interface that lead to failure in bonding and cementation (8).…”