The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Evaluation of trueness and precision of removable partial denture metal frameworks manufactured with digital technology and different materials

  • Leonardo Ciocca (Oral and Maxillo-Facial Prosthodontics, Section of Prosthodontics, Department of Biomedical and Neuromotor Science, Alma Mater Studiorum University of Bologna) ;
  • Mattia Maltauro (Department of Management and Engineering, University of Padova) ;
  • Elena Pierantozzi (Oral and Maxillo-Facial Prosthodontics, Section of Prosthodontics, Department of Biomedical and Neuromotor Science, Alma Mater Studiorum University of Bologna) ;
  • Lorenzo Breschi (Oral and Maxillo-Facial Prosthodontics, Section of Prosthodontics, Department of Biomedical and Neuromotor Science, Alma Mater Studiorum University of Bologna) ;
  • Angela Montanari (Department of Statistical Sciences, Alma Mater Studiorum University of Bologna) ;
  • Laura Anderlucci (Department of Statistical Sciences, Alma Mater Studiorum University of Bologna) ;
  • Roberto Meneghello (Department of Management and Engineering, University of Padova)
  • Received : 2022.09.29
  • Accepted : 2023.01.31
  • Published : 2023.04.30
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Abstract

PURPOSE. The aim of this study is to evaluate the accuracy of removable partial denture (RPD) frameworks produced using different digital protocols. MATERIALS AND METHODS. 80 frameworks for RPDs were produced using CAD-CAM technology and divided into four groups of twenty (n = 20): Group 1, Titanium frameworks manufactured by digital metal laser sintering (DMLS); Group 2, Co-Cr frameworks manufactured by DMLS; Group 3, Polyamide PA12 castable resin manufactured by multi-jet fusion (MJF); and Group 4, Metal (Co-Cr) casting by using lost-wax technique. After the digital acquisition, eight specific areas were selected in order to measure the Δ-error value at the intaglio surface of RPD. The minimum value required for point sampling density (0.4 mm) was derived from the sensitivity analysis. The obtained Δ-error mean value was used for comparisons: 1. between different manufacturing processes; 2. between different manufacturing techniques in the same area of interest (AOI); and 3. between different AOI of the same group. RESULTS. The Δ-error mean value of each group ranged between -0.002 (Ti) and 0.041 (Co-Cr) mm. The Pearson's Chi-squared test revealed significant differences considering all groups paired two by two, except for group 3 and 4. The multiple comparison test documented a significant difference for each AOI among group 1, 3, and 4. The multiple comparison test showed significant differences among almost all different AOIs of each group. CONCLUSION. All Δ-mean error values of all digital protocols for manufacturing RPD frameworks optimally fit within the clinical tolerance limit of trueness and precision.

Keywords

Acknowledgement

Authors thank Dr. Andrea Sandi for his kind assistance in providing the manufacturing of frameworks used in this study.

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