Comparison of titanium dioxide nanoparticles and silver nanoparticles for flexural strength once incorporated in heat-cure acrylic denture base resin: An in vitro Study

Abstract

Aim: Polymethylmethacrylate (PMMA) resin is the most by and large used denture base material. Denture fractures are sequential to the flexure or impacting forces. Different nanoparticles such as titanium dioxide and silver nanoparticles have been used to improve its antimicrobial properties. There are limited data on their effect on flexural strength. The aim of the study was to assess the effect of silver nanoparticles and titanium dioxide nanoparticles addition on flexural strength of PMMA resins. Settings and Design: One hundred and thirty specimens divided into four groups: Control Group A, TiO 2 -reinforced Group B, silver nanoparticles reinforced Group C, and mixture of TiO 2 and silver nanoparticle reinforced Group D. Each reinforced group further divided based on concentrations -0.5%, 1%, 2%, and 3%. Materials and Methods: Rectangular metal models of the American Dental Association (ADA)- specified dimensions: 65 mm × 10 mm × 3 mm were used to form a mold space for the fabrication of specimens. Three-point bend test was used to determine the flexural strength of the samples after immersion in distilled water for 2 weeks. Statistical Analysis: The data collected were subjected to analysis of variance followed by post hoc Tukey’s test. Results: The comparison of the mean flexural strengths showed a statistically significant gradual decrease on increasing the concentrations of nanoparticles. Maximal flexural strength was seen in the control group and least with 3% Ag + TiO 2 Nps. The modified specimen also showed color changes. Conclusions: In an in vitro environment, addition of TiO 2 and silver decreases the flexural strength of the PMMA. It also causes visible color changes.

Comparative Evaluation of TiO2 Nanoparticle Addition and Postcuring Time on the Flexural Properties and Hardness of Additively Fabricated Denture Base Resins

“…Other studies [40,41] found opposite results of a decreased FS with the addition of TNPs. Pai et al [56] added TNPs at different concentrations of 0.5%, 1%, 2%, and 3% and found that the flexural strength of PMMA decreased with the addition of TNPs with a gradual decline with increasing concentrations of nanoparticles. In contrast, the study by Bdelraouf et al [57] showed an increase in the FS with 5% TNPs, which may be due to the resin type used: autopolymerized resin.…”

Surface roughness of implant retained mandibular acrylic overdenture treated with Titanium Dioxide Nanoparticles, An in vitro comparative study

“…(5) TiO2 NP, when added to denture base resins, showed a significant increase in certain properties, like the mechanical properties of PMMA. (15) , Hwever, on addition of these nanoparticles, the comparative effect on surface Roughness is not known.…”

Application of Antimicrobial Nanoparticles of Metals and Their Oxides in Improving Dental Prostheses

“…НЧ Ag найбільш широко використовуються для модифікації матеріалів зубних протезів [31]. Їх синтезують хімічними і фізичними методами, а також за участю біологічних речовин, тобто методами «зеленого синтезу» [32], і вводять до складу протезного матеріалу [33] Добре відомо, що наносрібло має широкий спектр антибактеріальної дії [34]. Це досягається шляхом порушення проникності клітинної стінки бактерій, пошкодження ДНК та інактивації основних білків [35].…”