Analysis of Enamel Wear Against Ceramic Restorations
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|ClinicalTrials.gov Identifier: NCT00223405|
Recruitment Status : Completed
First Posted : September 22, 2005
Last Update Posted : November 22, 2016
- To characterize the microstructure (fracture toughness, particle size of ceramic, and inter-particle spacing) of three ceramic materials
- To test the hypothesis that lower fracture toughness of glass and/or crystal phase in ceramics reduce wear damage of enamel.
- To test the hypothesis that smaller sized crystals reduce wear damage of enamel.
- To test the hypothesis that larger inter-particle spacing reduces wear damage of enamel.
- To test the hypothesis that equivalent wear patterns exist in all directions between enamel versus enamel and ceramic versus enamel.
- To test the hypothesis that bite force does not correlate with wear rates.
- To test the hypothesis that salivary flow does not correlate with wear rates.
- To test the hypothesis that a greater amount of wear is not associated with a loss in vertical dimension of occlusion.
- To test the hypothesis that a greater amount of wear does not correlate with secondary cementum deposition as part of the passive eruption process.
- To test the hypothesis that maximum wear occurs early and wear rates level off within the first two years.
- To test the hypothesis that in vitro wear analysis does not correlate with in vivo wear measurements
|Condition or disease||Intervention/treatment|
|Tooth Wear||Device: crown placement|
|Study Type :||Observational|
|Actual Enrollment :||36 participants|
|Official Title:||Analysis of Clinical Wear Patterns of Tooth Enamel and Ceramic Restorations as a Function of Particle Size, Inter-Particle Spacing and Fracture Toughness of Ceramic Crystals|
|Study Start Date :||April 2003|
|Actual Primary Completion Date :||January 2009|
|Actual Study Completion Date :||January 2009|
metal-ceramic (D'Sign) o
Metal ceramic crown will be placed
Device: crown placement
an all-ceramic crown (IPS Empress2, Eris EXC).
All ceramic crown will be placed
Device: crown placement
- wear of the opposing enamel will be measured yearly for four years [ Time Frame: up to 4 years ]
- wear of ceramic in vivo [ Time Frame: up to 4 years ]
- improved function of crown [ Time Frame: uo to 4 years ]
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00223405
|United States, Texas|
|University of Texas Health Science Center at San Antonio|
|San Antonio, Texas, United States, 78229-3900|
|Principal Investigator:||Josephine Esquivel-Upshaw, D.M.D.,M.S.||The University of Texas Health Science Center at San Antonio|