Comparing Fracture Resistance of Provisional Restorations of 3-Unit Fixed Partial Dentures: An in Vitro Study of CAD/CAM versus Indirect Technique
Keywords:computer-aided design; dental restoration- temporary; denture, partial, fixed; fracture resistance; polymethyl methacrylate
Objective: To compare the indirect and CAD/CAM techniques and using acrylic and composites resins on
the fracture resistance of provisional 3-unit fixed partial dentures (FPDs).
Materials and Methods: In in vitro setting, thirty samples were divided into three groups included 10
FPDs manufactured indirectly and made of composite based bis-acryl (Protemp 4) resin, 10 FPDs indirectly
milled with polymethyl methacrylate resin (PMMA) and 10 FPDs fabricated by CAD/CAM PMMA blocks.
Fracture resistance was measured using universal testing machine (UTM). The master model was made of
NiCr-alloy which designed using CAD/CAM technology.
Results: FPDs fabricated using CAD/CAM PMMA blocks showed the highest fracture resistance values
followed by Protemp 4 and then PMMA using indirect method. Statistically significant difference was
found between the three groups (P=0.001). Bonferroni test was applied for pair wise comparison, in which
the statistically significant difference was observed between FPDs fabricated by CAD/CAM which made
of PMMA blocks and Protemp 4 and between CAD/CAM PMMA blocks and indirect/PMMA FPDs and
between indirect/Protemp 4 FPDs and indirect/PMMA FPDs. Hence this suggested that PMMA significantly
has minimum value of fracture resistance when compared to both CAD/CAM and Protemp 4.
Conclusion: This study proved the superiority of CAD/CAM PMMA blocks for fabricating 3-unit FPDs
over Protemp 4 and PMMA using indirect method, and the superiority of Protemp 4 over PMMA in terms
of fracture resistance using indirect methods
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