Compression Force Testing of Veneer-Retained Anterior Fixed Partial Dentures. (2022)

• Record Type: Journal Article
• Authors: Serban, C.; Cotca, C.C.; Bretean, I.D.; Zaharia, C.; Negrutiu, M.L.; Rominu, M.; Marsavina, L.; Sinescu, C.
• Is Part Of: Dental materials. Volume 38(2022)Supplement 1
• Page Start: e38
• Page End: e39
• Publication Date: 2022
• Subjects: Dentistry -- Periodicals; Dental materials -- Periodicals; 617.695
• DOI: 10.1016/j.dental.2021.12.092
• Languages: English
• ISSNs: 0109-5641

Abstract

Abstract : Purpose/Aim: The focus of this study is twofold; the first objective is to evaluate the resistance of veneer-retained anterior fixed partial dentures to compression testing. The second objective is to determine if veneer retainers with these axial grip extensions improve the restorations resistance to compressive forces as demand for biomaterial and access to care is often globally differentiated. Materials and Methods: Two maxillary typodont models with edentulous spaces in the left lateral incisor area were obtained. On each typodont model, the central incisor and canine neighbouring the edentulous space were given veneer-type preparations with a chamfer finish line. On one model, 2-mm axial grip extensions were added to the prepared facial surface of the abutment teeth. Metal duplicates of the prepared abutment teeth and edentulous spaces of each typodont model were produced using the lost wax casting technique. The two metal duplicates were scanned, and ten identical CAD/CAM restorations were produced for each metal duplicate. The restorations were cemented to metal duplicates and were subjected to compressive strength testing using a universal testing machine. Compressive forces were applied from the incisal margin towards the cervical in order to determine the force at which the restorations undergo debonding or fracture. Results: Subject specimen N tested totalled 20. The veneer-retained restorations without axial grip extensions all underwent debonding but none fractured. In the veneer-retained restorations with axial grip extensions retention, nine cases of debonding (90%) were recorded and one case of fracture (10%) was recorded. The veneer-retained restorations with axial grip extensions (M = 302 N, SD = 79) compared to the restorations without axial grip extensions (M = 228 N, SD = 60) withstood significantly higher compressive forces (p < 0.05). Conclusions: This study shows that veneer-retained anterior fixed partial dentures with axial grip extensions can withstand higher compression forces than veneer-retained anterior fixed partial dentures without axial grip extensions. Veneer-retained anterior bridges can be useful in addressing esthetic concerns in a minimally invasive manner. This study shows that axial grip extensions can play a crucial and important role in addressing concerns about resistance and long-term success of this type of restoration. An important clinical relevance will be highlighted for endodontically treated dentition versus non-endodontic treated dentition. Additionally, there will be reporting on intersectional pending studies regarding custom geo-position of axial grip extensions preparation design.