A Comparative Study of Different CAD/CAM Materials Reinforcing Implant Retained Overdenture Base Material (An In vitro Study)

Abstract

Background: New types of CAD/CAM materials are currently used on wide scales to reinforce implant-retained overdentures as a substitute for conventionally non-reinforced overdentures; thus, further studies are needed to validate these materials.Methodology: Fifteen implant-retained overdentures were constructed. Three completely edentulous 3D-printed models were obtained, in which 6 laboratory implant analogs were secured in the position of teeth 33 and 43 with ball attachment. The 3D-printed models were divided into 3 groups. Group 1 received five mandibular implant retained overdentures reinforced with poly-ether-ketone-ketone (PEKK) meshwork. Group 2 received mandibular implant-retained overdentures reinforced with fiberglass-reinforced composite resin (FRC) meshwork. Group 3 received five mandibular implants retained overdenture reinforced with cobalt chromium (CoCr) meshwork. A universal testing machine was used to evaluate the fracture resistance of the fifteen overdentures, and the recorded data were collected, tabulated, and statistically analyzed.Results: There was a significant difference between group 3 and groups 1 and 2, while there was no significant difference between groups 1 and 2. The greatest fracture load was found in Group 1 (4310 ± 214.57), followed by Group 2 (4261 ± 218.41), and the lowest fracture load was found in Group 3 (3877 ± 201.74).Conclusion: The (FRC) and (PEKK) meshworks provided better alternatives to CoCr. meshwork as a reinforcement material in heat-cured acrylic resin implant retained overdentures.