Analysis of Enamel Wear Against Ceramic Restorations
|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||Phase|
|Tooth Wear||Device: crown placement||Phase 2|
Show Detailed Description
|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|
|Primary Completion Date :||January 2009|
|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 ]
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|