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Title Flexural Strength of Denture Base Acrylic Resins Processed by Conventional and CAD/CAM Methods
URL
Publication Date
Date Accessioned
Degree MS
Discipline/Department Oral Biology
Degree Level masters
University/Publisher Texas A&M University
Abstract High flexural strength is a desirable property for denture base resins. Currently there is a lack of published studies evaluating the physical properties of newer denture bases such as the CAD/CAM milled bases. The purpose of this study was to compare the flexural strength of three different denture base resins fabricated by compression molding, injection molding, and pre-polymerized CAD/CAM milling. Three groups of ten PMMA acrylic denture base resins were processed into rectangular plates for total sample size of thirty (n=30). The groups differed in their method of processing and resin composition. The three groups were injection molded (SR-Ivocap High Impact, Ivoclar Vivadent), compression molded (Lucitone 199, Dentsply), and pre-polymerized CAD/CAM milled resins (Avadent Digital Dentures). Following storage in water for one week, flexural strength was measured using a 3-point bend test until failure. Kruskal-Wallis and Mann-Whitney tests were used for statistical comparison between groups. Significant differences in flexural strength was observed among the groups tested. The flexural strength of the pre-polymerized CAD/CAM milled acrylic resin group was higher than that of conventional method groups of compression molded and injection molded. The compression molded group exhibited higher flexural strength than the injection molded group. The results suggest that pre-polymerized milled denture bases may be a useful alternative to conventionally processed denture bases in situations where increased bending forces are anticipated.
Subjects/Keywords Denture; acrylic; flexural strength; CAD/CAM; mill
Contributors Nagy, William (advisor); Kontogiorgios, Elias (committee member); Murchison, David (committee member); Chen, Jenn-Hwan (committee member)
Language en
Country of Publication us
Record ID handle:1969.1/161547
Repository tamu
Date Indexed 2020-08-12
Grantor Texas A & M University
Issued Date 2017-05-08 00:00:00

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…CONCLUSIONS Within the limits of this in vitro study, the flexural strength of a denture base resin may be influenced by the method in which it is processed. Pre-polymerized CAD/CAM milled denture resin exhibited higher flexural strength compared to the two…

…demonstrated greater standard deviations and brittleness. (5) CAD/CAM (Computer-Aided Design/Computer Aided Manufacturing) was introduced in the late 1950’s with the introduction of PRONTO, a numerical control programming tool. This was the…

…first CAM software system developed by Dr. Patrick J. Hanratty, considered the father of CAD/CAM. (6) Several developments in CAD/CAM technology for dentistry occured in the 1980’s with the help of three pioneers who shaped the current methods…

…used today. Two of them, Dr. Moermann and Dr. Andersson, went on to develop two modern CAD/CAM systems CEREC and Procera for clinical dental restorations. (7) Since the turn of the century, this same technology has evolved to include…

…fabricated by compression molding and injection molding, and pre6 processed CAD/CAM milling. The null hypothesis was that there is no significant difference in the flexural strength among the three groups. 7 2. MATERIALS AND METHODS Pre-polymerized…

…processing and resin composition. The three groups were injection molded (SR-Ivocap High Impact, Ivoclar Vivadent), compression molded (Lucitone 199, Dentsply), and pre-polymerized CAD/CAM milled (Avadent Digital Dentures) resins…

…placed in cold water, maintaining pressure, for 30 minutes. The specimens were then deflasked. 2.3 Pre-polymerized CAD/CAM milled Pre-polymerized CAD/CAM milled rectangular plates were provided from Avadent Digital Dentures and were in final dimensional…

…strength of the pre-polymerized CAD/CAM milled acrylic resin group was higher than that of compression and injection molded groups. The compression molded group exhibited higher flexural strength than the injection molded group. The Mann-Whitney test showed…

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