Comparative Analysis of Fracture Resistance between CAD/CAM Materials for Interim Fixed Prosthesis

Abstract

The aim of this study was to evaluate and compare the resistance to fracture of interim restorations obtained through additive techniques (3D impressions) and subtractive techniques (milling) using a computer-aided design and manufacture (CAD/CAM) system of a three-unit fixed dental prosthesis (FDP) to ascertain its clinical importance. (1) Materials and methods: In total, 40 samples were manufactured and divided into two groups (n = 20) using: (1) light-curing micro hybrid resin for temporary crowns and bridges (PriZma 3D Bio Prov, MarketechLabs, São Paulo, Brazil) for the rapid prototyping group (RP) and (2) a polymethylmethacrylate (PMMA) CAD/CAM disc (Vipiblock Trilux, VIPI, São Paulo, Brazil) for the computer-assisted milling (CC). The resistance to fracture was determined with a universal testing machine. (2) Results: The strength and the standard deviation for the computer-assisted milling group were higher (1663.57 ± 130.25 N) than the rapid prototyping (RP) group, which had lower values of (1437.74 ± 73.41 N). (3) Conclusions: The provisional restorations from the computer-assisted milling group showed a greater resistance to fracture than the provisional restorations obtained from the rapid prototyping group.

Influence of CAD/CAM Milling and 3D-Printing Fabrication Methods on the Mechanical Properties of 3-Unit Interim Fixed Dental Prosthesis after Thermo-Mechanical Aging Process

“…This variation between the studied materials might be related to the value of elastic modulus since the decrease in elastic modulus leads to reduced resistance to fracture [ 47 ]. This finding agreed with the results of previous studies that tested the flexural strength of 3- or 4-unit prostheses [ 11 , 12 , 14 , 19 , 50 ]. However, Henderson et al [ 25 ] reported that the fracture of the IFDP was restricted to the distal connector extending to the pontic cusp tip.…”

“…Nowadays, this technology is more available, and widely used in the fabrication of IFDPs [ 16 , 17 ]. Manufacturing of dental prostheses using CAD/CAM technology could be accomplished by subtractive method (milling), or additive method (three-dimensional (3D) printing) [ 8 , 18 , 19 ]. Milled resin is currently used in the fabrication of IFDPs because it has shown higher strength and durability than self-cured PMMA before and after thermomechanical aging [ 6 , 12 , 20 ].…”

Physical and Mechanical Properties of 3D-Printed Provisional Crowns and Fixed Dental Prosthesis Resins Compared to CAD/CAM Milled and Conventional Provisional Resins: A Systematic Review and Meta-Analysis

“…This systematic review and meta-analysis is the first of its kind to analyze and document all the available studies comparing the mechanical and/or physical properties of the 3D-printed provisional crown and FPD materials with CAD/CAM milled and/or conventional provisional resins. All twentyfive papers included were in vitro studies [16,[26][27][28][29][30][31][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. The overall findings reveal that the mechanical and physical properties of the provisional crown and FDP materials are affected by the technique of fabrication and composition of the tested materials.…”

“…Thus, the pooled estimate favored 3D-printed PMMA resin with p < 0.0001 (Figure 6). (ii) Comparing the fracture strength of bis-acrylic and other photopolymer hybrid 3Dprinted provisional resins: the FSs of 3D-printed bis-acrylic resin [48], micro-hybrid resin [46], photopolymer resin [52], and UDMA-based resins [50] were reported to be lower than PMMA-based CDA/CAM resins. A study by Henderson et al [51] reported that bis-acrylic-based 3D-printed resins have lower FS when compared to bis-acrylic-based conventional resins.…”

An Interdisciplinary Study Regarding the Characteristics of Dental Resins Used for Temporary Bridges

“…The conventional materials for provisional restorations care can be divided into two groups according to their chemical composition: those that are based on monomethacrylates or acrylic resins, which include polymethylmethacrylate (PMMA) and polyethyl/butyl methacrylate (PEMA); and those that are based on dimethacrylates or bis-acryl/composite resins such as bisphenol A-glycidyl dimethacrylate (Bis-GMA) and urethane dimethacrylate (UDMA) [13]. These materials, used in conventional technologies, can also have a number of disadvantages such as low mechanical strength, color instability, the existence of residual monomer [14][15][16][17][18].…”