Comparing Fracture Resistance of Provisional Restorations of 3-Unit Fixed Partial Dentures: An in Vitro Study of CAD/CAM versus Indirect Technique

Authors

  • Asadollah Ahmadzadeh
  • Behnam Beheshti
  • Mohamad Hossein Haghighizadeh

DOI:

https://doi.org/10.37506/ijfmt.v15i2.14658

Keywords:

computer-aided design; dental restoration- temporary; denture, partial, fixed; fracture resistance; polymethyl methacrylate

Abstract

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

Author Biographies

Asadollah Ahmadzadeh

Professor of Prosthodontics

Behnam Beheshti

Resident of Prosthodontics, Department of Prosthodontics,
Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

Mohamad Hossein Haghighizadeh

Ahvaz Jundishapur University of
Medical Sciences, Ahvaz, Iran

Published

2021-03-24

How to Cite

Asadollah Ahmadzadeh, Behnam Beheshti, & Mohamad Hossein Haghighizadeh. (2021). Comparing Fracture Resistance of Provisional Restorations of 3-Unit Fixed Partial Dentures: An in Vitro Study of CAD/CAM versus Indirect Technique. Indian Journal of Forensic Medicine & Toxicology, 15(2), 2009-2016. https://doi.org/10.37506/ijfmt.v15i2.14658