DENTAL MATERIALS
Cite this article:
Roulet J-F,
Abdulhameed N,
Shen C.
Reinforcement of
polymethylmethacrylate (PMMA) resin
with perforated metal
plates. Stoma Edu J.
2015;2(2):100-107.
REINFORCEMENT OF
POLYMETHYLMETHACRYLATE
(PMMA) RESIN WITH PERFORATED
METAL PLATES
Jean-François Roulet1a*
Nader Abdulhameed1b
Chiayi Shen1c
1
Department of Restorative Dental Sciences
College of Dentistry, University of Florida
Gainesville FL 32610-0415, USA
a.
DDS, PhD, Prof hc, Professor
Director of Center for Dental Biomaterials
b.
BDS, MS, Visiting scientist, Candidate PhD
Material Sciences
c.
PhD, Associate Professor
Abstract
Background: Full dentures show a high rate of fractures under clinical use.
Therefore strengthening of the denture base is expected to be beneficial with
respect to reducing the fracture risk. Preformed perforated thin metal plates
seem to be a simple tool for reinforcement.
Objective: To test the strengthening effect of perforated metal plates
incorporated into a PMMA based resin as a function of the bonding strategy.
Materials and Methods: Preformed gold plated stainless steel grid
strengtheners were purchased, pressed flat and embedded in wax and
processed as dentures using the Ivobase hybrid injection moldable material
(Ivoclar Vivadent, Schaan, Liechtenstein). Prior to processing the surfaces were
either not treated or treated with a primer (Monobond Plus, Ivoclar Vivadent,
Schaan, Liechtenstein) and grit blasted and primed. They were then sectioned
into beams for three point bending test. Resin beams of identical dimensions
without reinforcement were used as control. Flexural strength and modulus
were calculated based on the load to fracture determined by an Instron
universal testing machine. The data were analyzed with ANOVA and Tukey’s
test.
Results: Flexural strength: control beams fractured at 78.8 ± 5.9 MPa, while, with
the exception of the grit blasted samples, the experimental groups showed
significantly higher strength (97.2 respect. 95.4 MPa).
Flexural Modulus: The control group yielded 2261.7 ± 261.4 MPa, while all
experimental groups had a significantly higher modulus (3239.1 – 3952.4 MPa)
The surface treatments did not show significant differences.
Conclusions: The grid strengtheners tested had a significant effect on
strengthening. Under the conditions of this study