Effect of Cavity Optimization on the Fracture Resistance of Inlay-Restored Molars (An In-Vitro Study).
Fatma Ahmed; Dena Safwat Mustafa;
Abstract
Purpose:
The goal of this study was to assess the effect of two different types of resin-based composites used for cervical margin relocation (CMR) on fracture resistance and mode of failure of ceramic MOD-inlay restorations.
Materials and Methods:
Twenty-four MOD Class II cavities (3 mm in width and 2 mm in depth) were prepared in human first molars to receive indirect E-max CAD ceramic inlays; where mesially proximal boxes extend 2 mm below the cementoenamel junction (CEJ). Prepared cavities were allocated into three groups (n = 8) to perform the cervical margin relocation; Group I: inlay without CMR, Group II: restored with (SDR), Group III: restored with injectable composite. Thermocycling was performed at 5,000 cycles in water bath at (5-55 ˚C) in a standard thermocycling machine. Specimens were subjected to fracture resistance testing using the Universal Testing Machine. Data was statistically analyzed using One-way ANOVA followed by Tukey’s post hoc test.
Results:
There was a significant difference between different groups (p<0.001). The highest strength value was found in injectable composite samples (1760.88±240.05 N) while the lowest value was recorded by inlay without CMR (906.94±90.66 N).
Conclusion:
High-strength injectable is the best base regarding enhancement to fracture resistance.
The goal of this study was to assess the effect of two different types of resin-based composites used for cervical margin relocation (CMR) on fracture resistance and mode of failure of ceramic MOD-inlay restorations.
Materials and Methods:
Twenty-four MOD Class II cavities (3 mm in width and 2 mm in depth) were prepared in human first molars to receive indirect E-max CAD ceramic inlays; where mesially proximal boxes extend 2 mm below the cementoenamel junction (CEJ). Prepared cavities were allocated into three groups (n = 8) to perform the cervical margin relocation; Group I: inlay without CMR, Group II: restored with (SDR), Group III: restored with injectable composite. Thermocycling was performed at 5,000 cycles in water bath at (5-55 ˚C) in a standard thermocycling machine. Specimens were subjected to fracture resistance testing using the Universal Testing Machine. Data was statistically analyzed using One-way ANOVA followed by Tukey’s post hoc test.
Results:
There was a significant difference between different groups (p<0.001). The highest strength value was found in injectable composite samples (1760.88±240.05 N) while the lowest value was recorded by inlay without CMR (906.94±90.66 N).
Conclusion:
High-strength injectable is the best base regarding enhancement to fracture resistance.
Other data
| Title | Effect of Cavity Optimization on the Fracture Resistance of Inlay-Restored Molars (An In-Vitro Study). | Authors | Fatma Ahmed; Dena Safwat Mustafa | Keywords | Biomimetic Approach;Proximal box elevation;Injectable Composites;Restoration Longevity;Cervical Margin Relocation;MOD Inlays | Issue Date | Oct-2023 | Publisher | Egyptian Dental Association | Journal | Egyptian Dental Journal | Volume | 69 | Issue | 4 | Start page | 3085 | End page | 3093 | DOI | https://doi.org/10.21608/edj.2023.218074.2606 |
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