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. 2014 Mar;15(1):6-14.

Influence of different bonding agents and composite resins on fracture resistance of reattached incisal tooth fragment

Ar Davari  1 , M Sadeghi  2
Affiliations

Influence of different bonding agents and composite resins on fracture resistance of reattached incisal tooth fragment

Ar Davari et al. J Dent (Shiraz). 2014 Mar.

Abstract

Statement of problem: Reattachment of the fractured tooth fragment should be considered as a conservative treatment and valid alternative to a composite restoration.

Purpose: This in vitro study was to evaluate the influence of different adhesives and composite resins on fracture resistance of dental fragment reattached to the sectioned incisal edges.

Materials and method: 120 sound human maxillary central incisors were selected under standard conditions and randomly divided into 3 groups, 12 sound teeth were used as a control group and the remaining teeth were assigned to 3 groups (n=36) and each group into three subgroups (n=12). The incisal third of the samples was sectioned using a diamond disk and the respective fragments were then reattached utilizing different intermediate restorative materials, namely: i) adhesive materials alone (OptiBond S or OptiBond XTR or OptiBond All-in-One; ii) Premise flowable composite and iii) Point 4 composite in the one of the mentioned adhesive interface. After storage for two weeks at 37°C and 100% humidity and then thermocycling; shear bond strength (SBS) was recorded in kilogram force (kgf) by applying a load in the middle incisal third with a Zwick Universal Testing Machine at a cross-head speed of 1 mm/min. Data was analyzed with one-way ANOVA and Tukey HSD (p< 0.05).

Results: The control group had a significantly higher SBS than other groups (p= 0.001); the highest SBS values were obtained using the Premise flowable composite and OptiBond S adhesive (112.44±30.46 MPa); and the lowest with OptiBond All-in-One alone (33.97± 15.63 MPa).

Conclusion: Although, none of the tested materials provided fracture resistance similar to that found with the intact maxillary central incisors; utilizing the Premise flowable composite and OptiBond S adhesive improved the SBS of the reattached fragment than other materials.

Keywords: Composite resin; Dentin bonding agent; Reattachment technique; Tooth fracture.

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Figures

Figure 1
Figure 1
Flowable = PF; Point 4 = P4; Recovering rate of SBS (kgf) in relation to control group for testing groups.
See this image and copyright information in PMC

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