The Effect of the Selected Abutment Tooth on the Bond Strength of the Restoration in Resin Bonded Restorations in which the Upper Lateral Tooth is a Cantilever
Project no. 29565 · Status: Kapanmış · 2023
Summary
<p><strong>Purpose: </strong>The purpose of this study is to evaluate the bond strength (by fracture test and finite element stress analysis) of resin-bonded fixed prosthetic restorations made using lithium<strong> </strong>disilicate, metal-ceramic, zirconia, nanoceramic hybrid and resin materials with a single abutment tooth in the case of missing upper lateral teeth.</p><p><strong>Materials and Methods:</strong> Casting, additive manufacturing in 3D printer and CAD-CAM milling production methods were used in the production of restorations prepared as standard from five different materials (n=7) for a total of 70 upper central and canine teeth. All restorations were cemented using the Panavia F2.0 adhesive. The samples were fracture tested on a computer-controlled testing machine with a head speed of 0.5mm/min. Strength data (MPa) was obtained by dividing the fracture test (N) results by the broken/separated surface area (mm2). Data obtained from mechanical tests were analyzed using the SPSS 25.0 (Statistical Packages of Social Sciences) software. In the finite element stress analysis, stresses on the restorations after the vertical force applied to the 3D models were evaluated separately for each group.</p><p><strong>Results:</strong> The strength values of the restorations in which the central tooth was prepared as an abutment were found to be significantly higher in metal-ceramic and lithium disilicate materials than in other materials (p<0.05). The strength values of the restorations in which the canine tooth was prepared as an abutment were also found to be significantly higher in metal-ceramic, zirconia and lithium disilicate materials compared to other materials (p <0.05). It was observed that there was no significant difference in terms of strength when using the central or canine tooth as an abutment in lithium disilicate, metal-ceramic and resin materials (p>0.05). The strength data of zirconia and nanoceramic hybrid materials were found to be significantly higher in the canine abutment group than in the central abutment group (p<0.05). Finite element stress analysis showed that the von Mises and principal stress fields were concentrated in the connector region. Although the locations of the stress fields observed for all materials were similar, their values were found to be different.</p><p><strong>Conclusion:</strong> In situations where a central tooth is used as an abutment, lithium disilicate and metal-ceramic, and in the case of canine abutment, lithium disilicate, metal-ceramic and zirconia were found to be more durable than other materials. While lithium disilicate, nanoceramic hybrid and resin materials showed more cohesive fractures, metal-ceramic and zirconia materials showed adhesive fractures. The highest accumulation of stress was observed in the connector area.</p>