Comparison of the Masticatory Force (with 3D Models) of Complete Denture Base Acrylic Resins with Reline and Reinforcing Materials.

Catarina Calamote,José Luís Esteves,María Cristina Manzanares-Céspedes,Tomás Escuín,António Correia Pinto,António Sérgio Silva,Isabel Carolina Coelho,Luís Moreira

doi:10.3390/ma14123308

Abstract

The reinforcement of acrylic denture base remains problematic. Acrylic prosthesis fractures are commonly observed in prosthodontic practice and have not been reliably resolved. This study compared the resistance to masticatory force of acrylic bases of removable complete conventional prosthesis in 3D upper models. Forty acrylic base test specimens containing two types of reinforcement meshes (20 with glass fiber meshes (FIBER-FORCE®- Synca, Bio Composants MédicauxTM, Tullins, France), 20 with metal meshes (DENTAURUM®-Ispringen, Germany)), 20 with a conventional PMMA acrylic base (LUCITONE 199®-Dentsply Sirona, York, PA, USA), and 20 using a permanent soft reline material (MOLLOPLAST-B®-DETAX GmbH & Co. KG, Ettlingen, Germany) were tested—a total of 80 specimens. Half of the specimens were made for a low alveolar ridge and half for a high alveolar ridge. The data were analysed using one-way analysis of variance and Student’s t-test for independent test specimens. In the high-alveolar-ridge group, the prosthesis reinforced with the glass fiber mesh was the most resistant to fracture, while in the low-alveolar-ridge group, the non-reinforced prosthesis showed the highest resistance masticatory force. Prostheses with the permanent soft reline material showed the lowest resistance to fracture in both high and low-alveolar-ridge groups. The results show that the selection of the right reinforcement material for each clinical case, based on the height of the alveolar ridge, may help to prevent prosthesis fractures.

Highlights

Acrylic resin fracture is still an unresolved problem in removable prosthodontics, despite the well-known causes of fracture
In the high-alveolar-ridge group, the prosthesis reinforced with the glass fiber mesh had the highest resistance to fracture when the masticatory force was applied (4999.07 ± 0.48 N); this can be explained by the good adhesion of the glass fiber mesh to the acrylic base, when compared to the other reinforcement materials
The prosthesis resistance to masticatory forces varies depending on the alveolar ridge height

Summary

Introduction

Acrylic resin fracture is still an unresolved problem in removable prosthodontics, despite the well-known causes of fracture. This study compared the reinforcing of metal and glass fiber mesh to a permanent soft reline material, and to a simple conventional PMMA using two different alveolar ridge heights in 3D models with replica gengival mucosa, by applying a masticatory force to the samples in a TIRA test-2705 Universal Machine®. This was to replicate the individual clinical aspects of the healthy palate of an upper edentulous patient with all-natural lower teeth. Despite all the studies available in the literature comparing the reinforced resin bases, there is no evidence of a comparison of such materials with a permanent soft reline material, given that reline is a natural future procedure to readapt and increase the lifespan of a denture

Materials and Methods

ResuHltisgh Alveolar Ridge

Findings

Conclusions