An evaluation of fracture resistance of interim fixed partial denture fabricated using polymethylmethacrylate and reinforced by different fibres for its optimal placement: an in vitro study

Abstract

INTRODUCTIONRehabilitation of partially edentulous patients using fixed partial denture (FPD) is a well-established treatment protocol since many decades. These FPDs require a laboratory phase of fabrication that varies from days to weeks. A dimensionally stable, strong, and accurate interim restoration is an important component of this treatment modality. These interim restorations provide pulpal protection, positional stability, occlusal function, strength, and aesthetics.Polymethylmethacrylate (PMMA) is the most common material used to fabricate interim FPDs. This material lacks sufficient strength and hence various methods are being used for reinforcing it in the past like glass fibres, carbon fibres, kevlar fibres, polyethylene fibres, and stainless steel wire.1-4 To date, little information is available in the literature on fracture resistance of reinforced PMMA temporary crown and bridge materials. It is also not clear as to how the site of placement of fibre reinforcement, influences the fracture resistance of temporary crown and bridge materials. Therefore, this study was undertaken to evaluate the fracture resistance of interim FPDs using different types of fibre reinforcements and also to determine the most appropriate site of reinforcement of interim FPDs fabricated from PMMA. MATERIALS AND METHODThis study was designed in two stages. In the first stage various methods of reinforcement for interim FPDs made up of PMMA were evaluated. During the second stage, favourable sites of placement to strengthen the interim FPDs were evaluated. There were five groups of ten samples each namely the group 1 (unreinforced, control group), group 2 (glass fibrereinforced), group 3 (polyethylene fibre-reinforced), group 4 (glass and polyethylene mixed fibre) and group 5 (stainless steel reinforced).Samples were tested for fracture resistance in an Instron universal testing machine. The maximum load causing the initial fracture and fracture resistance were calculated. The mean and standard deviation for each group were determined. The data was analysed for differences using one way analysis of variance (ANOVA) (The Tukey's standardised range test) to An evaluation of fracture resistance of interim fixed partial denture fabricated using polymethylmethacrylate and reinforced by different fibres for its optimal placement: an in vitro study Col

A comparative study to check fracture strength of provisional fixed partial dentures made of autopolymerizing polymethylmethacrylate resin reinforced with different materials: An in vitro study

“…Wetting with monomer facilitates the resin to contact surface of every fiber, ensuring better bonding resulting in higher fracture resistance. This premodification of the glass fiber supports the result that we have achieved and are in agreement with the studies done by Viswambaran et al .,[ 1 ] Gupta and Reddy[ 13 ] Naveen et al .,[ 14 ] and Kapri. [ 15 ]…”

“…[ 3 ] It was also found that the strength of PMMA resin showed significant increase when reinforced with stainless steel wire, but results were found to be comparable with those of unidirectional glass fiber samples which coincides with the studies done by Viswambaran et al . [ 1 ] and Vallittu and Lassila[ 5 ] This can be attributed to possibility of adhesion of glass fiber with the resin matrix. In a similar study done by Geerts et al .,[ 18 ] stainless steel wire showed better results than glass fiber but was insignificant ( P > 0.05).…”

“…The use of provisional prosthesis in fixed partial dentures (FPD) in cases with full mouth or partial oral rehabilitation has been an indispensible protocol for restoring function, esthetics, occlusion, and providing pulpal protection until a permanent prosthesis can be given which may take from a week to several months. [ 1 ] They should be able to withstand occlusal forces so as to fulfill the above-mentioned requirements during the transitional period.…”

“…The strength of PMMA resin is only about one-twentieth that of metal-ceramic alloys, making fracture of the provisional restorations much more likely, especially for long-span provisional restoration cases, high-stress areas, cases with bruxism, or long-term use. [ 1 2 ] The frequent mechanical failures of provisional fixed prostheses usually cause inconvenience, loss of time, and embarrassment for both clinician and patient.…”

Molecular Dynamics approach for Fracture Simulation along a Weakly Bonded Interface

“…The transparency of this glassy material also helps in analyzing facture propagation during fracturing experiments (Alpern et al 2012). PMMA fracture behavior has been studied under different service applications (Viswambaran et al 2011), largely through experiments (Dalmas et al 2013) and continuum numerical analysis methods (Faye et al 2016). Micro-scale fracture propagation of these brittle materials has been examined, helping provide insight into the macroscopic mechanical properties (Rottler et al 2002).…”