Abstract
The aim of our study was to evaluate fracture resistance of the PMMA complete dentures and to make a comparison between the classic acrylic maxillary complete dentures and the metal-reinforced ones, in terms of fracture resistance during function and to compare the fracture pattern of the two groups of complete dentures. We used maxillary complete dentures made of heat-processed acrylate, 5 exclusively and 5 in which a metal-cast net in the form of a mesh was inserted after being casted, worn by patients for a period of 5 years. A bilateral progressive force was applied to the PM2-M1 area until the samples failed, recording the force value at which the first change occurred. A Universal Loading Machine was used. The results were analyzed using the ANOVA method. For the classic acrylic complete dentures group, the minimum fracture force value was 1060 N, the maximum fracture force value being 2443 N. For the reinforced complete dentures group, the minimum fracture force value was 3320 N, the maximum value being 3760 N. Statistical analysis of data using the ANOVA shows that the results are statistically relevant, with a p value of 0.000137 (p[0,05). All the dentures from the classic acrylic complete dentures group fractured presenting two or more fracture lines, most of them involving also fractures on the acrylic teeth and breaking into multiple pieces, while all the dentures from the reinforced complete dentures group fractured presenting one or two fracture lines, most of them without detachable fragments and involving also fractures on the acrylic teeth.
Highlights
The aim of our study was to evaluate fracture resistance of the PMMA complete dentures and to make a comparison between the classic acrylic maxillary complete dentures and the metal-reinforced ones, in terms of fracture resistance during function and to compare the fracture pattern of the two groups of complete dentures
Within the limits of our study, we can conclude that heat-processed acrylate ensures a good resistance to fracture for maxillary complete dentures, even after a 5-years period of use, time frame during which its qualities are influenced by specific factors from the oral environment and by accumulated functional stresses
The resulted necessary forces needed to fracture the heat-processed acrylic base of the maxillary complete dentures proved to be much higher than masticatory forces registered in a dentulous healthy patient
Summary
The aim of our study was to evaluate fracture resistance of the PMMA complete dentures and to make a comparison between the classic acrylic maxillary complete dentures and the metal-reinforced ones, in terms of fracture resistance during function and to compare the fracture pattern of the two groups of complete dentures. We used maxillary complete dentures made of heat-processed acrylate, 5 exclusively and 5 in which a metal-cast net in the form of a mesh was inserted after being casted, worn by patients for a period of 5 years. Because the fracture strength of PMMA is not always satisfactory, practitioners attempted to improve the physical qualities of this material by incorporating different types of fibers such as nylon, polyethylene, polyamide, glass fiber, ceramic fiber, or by reinforcing the acrylic base, inserting cast or bent solid metal nets as strengtheners, trying to increase flexural and impact strength as well as the fatigue resistance of the resin [9,10,11,12]. The flexural load was applied until the samples failed, recording the force value at which the first change occurred.
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