Thesis
Comparison of static fracture resistance of denture base materials and pickup materials for hybrid conversion prostheses: an in vitro study
University of Iowa
Master of Science (MS), University of Iowa
Autumn 2019
DOI: 10.17077/etd.005205
Abstract
OBJECTIVES: The popularity of immediate implant supported fixed complete dentures is on the rise with the increased demand by patients for a fixed solution at the time of tooth extraction. This treatment modality is not without complications. The most prevalent complication reported in the literature for these prostheses is denture base fracture. The purpose of this study is to examine the force to fracture of four different denture base and pickup material combinations in an in vitro model.
MATERIALS AND METHODS: An implant jig was milled from aluminum to represent the platform which held two Nobel multiunit plus abutment analogs 15 mm apart from each other. Sixty acrylic blocks measuring 10 mm x 8 mm x 45 mm were fabricated containing two holes 15 mm apart and 15 mm from the point of loading, to form a cantilever. The samples consisted of four groups: group 1A: Lucitone 199+Densply repair resin (RR), group 1B Lucitone 199+EZ PickUp, 2A Ivobase CAD+Dentsply repair resin, group 2B Ivobase CAD+EZ PickUp. Nobel temporary snap abutments were torqued to the implant jig at 15 Ncm and the acrylic blocks were attached with their corresponding pickup material according to manufacturer’s instructions. Samples were polished and loaded at a point corresponding cantilever length to AP spread of 1:1 or 15 mm. A mechanical testing machine was used to load the specimens to fracture and the force at fracture as well as the mode of failure were recorded.
RESULTS: There was strong evidence of differences in mean fracture load between the four groups (p<0.0001). After Tukey adjustment for multiple comparisons, the data showed that the mean force to fracture was significantly greater for the CAD/CAM+RR group than for any of the other three treatment combinations. The second greatest mean force to failure was associated with the LUCITONE199+RR group, which was significantly greater than the mean force to failure for either of the treatment combinations using the EZ PickUp repair material. The latter two groups were not statistically significantly different from each other in terms of mean force to failure.
CONCLUSION: CAD/CAM denture bases utilizing autopolymerizing repair resin for the pickup material demonstrates the highest fracture resistance when statically loading in vitro immediate implant supported fixed complete denture samples.
Details
- Title: Subtitle
- Comparison of static fracture resistance of denture base materials and pickup materials for hybrid conversion prostheses: an in vitro study
- Creators
- Matthew French
- Contributors
- Tarek El-Kerdani (Advisor)Julie Holloway (Committee Member)Deborah Dawson (Committee Member)
- Resource Type
- Thesis
- Degree Awarded
- Master of Science (MS), University of Iowa
- Degree in
- Oral Science
- Date degree season
- Autumn 2019
- DOI
- 10.17077/etd.005205
- Publisher
- University of Iowa
- Number of pages
- ix, 48 pages
- Copyright
- Copyright 2019 Matthew French
- Language
- English
- Description illustrations
- color illustrations
- Description bibliographic
- Includes bibliographical references (pages 44-47).
- Public Abstract (ETD)
Fixed implant dentures that are delivered at the same time implants are surgically placed have clinical problems associated with their use. Fixed implant dentures are composed of three essential components: the denture (denture base and denture teeth), temporary metal posts which attach the denture to the implants, and the pickup material which attaches the denture to the temporary metal posts. The most common clinical problem is fracture of the denture acrylic adjacent to the metal posts that connect the implant denture to the implants themselves. The purpose of this study was to test different denture material/pickup material combinations to determine which material combination would provide the highest resistance to fracture.
Sixty acrylic blocks measuring 10 mm x 8 mm x 45 mm were fabricated containing two holes 15 mm apart and 15 mm from the point of loading, to form a cantilever. The test specimens consisted of four groups: group 1A: Lucitone 199+Densply repair resin (RR), group 1B Lucitone 199+EZ PickUp, 2A Ivobase CAD+Dentsply repair resin, group 2B Ivobase CAD+EZ PickUp. The specimens in group 1A were made with traditional denture resin and the pickup material was self-curing acrylic repair resin. Group 1B specimens were made with traditional denture resin and the pickup material was composite based resin. Group 2A specimens were made with a CAD/CAM based material and the pickup material was self-curing acrylic repair resin and Group 2B specimens were made with a CAD/CAM material and the pickup material was composite based resin. An aluminum jig was made to hold two implants to which the blocks were secured for testing to represent intraoral implant position. A static force was applied to the specimens at the end of the 15mm cantilever until they fractured.
Results showed that the CAD/CAM denture base with self-curing acrylic repair resin resisted a higher load at fracture than the traditional denture resin with repair resin and that both the CAD/CAM and traditional denture base resins using composite as a pickup material were the weakest, requiring a similar force needed to fracture these two treatment combinations. Therefore, immediate fixed implant dentures using CAD/CAM denture base material and self-curing acrylic repair resin as a pick-up material provide higher resistance to fracture under in vitro static loading conditions.
- Academic Unit
- Oral Pathology, Radiology and Medicine
- Record Identifier
- 9983779999902771
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