Analysis of Enamel Wear Against Ceramic Restorations

Completed

Conditions studied: Tooth Wear

In brief

1. To characterize the microstructure (fracture toughness, particle size of ceramic, and inter-particle spacing) of three ceramic materials 2. To test the hypothesis that lower fracture toughness of glass and/or crystal phase in ceramics reduce wear damage of enamel. 3. To test the hypothesis that smaller sized crystals reduce wear damage of enamel. 4. To test the hypothesis that larger inter-particle spacing reduces wear damage of enamel. 5. To test the hypothesis that equivalent wear patterns exist in all directions between enamel versus enamel and ceramic versus enamel. 6. To test the hypothesis that bite force does not correlate with wear rates. 7. To test the hypothesis that salivary flow does not correlate with wear rates. 8. To test the hypothesis that a greater amount of wear is not associated with a loss in vertical dimension of occlusion. 9. To test the hypothesis that a greater amount of wear does not correlate with secondary cementum deposition as part of the passive eruption process. 10. To test the hypothesis that maximum wear occurs early and wear rates level off within the first two years. 11. To test the hypothesis that in vitro wear analysis does not correlate with in vivo wear measurements

Key facts

Study ID

NCT00223405

Run by

The University of Texas Health Science Center at San Antonio

People needed

36

Starts

2003-04-01

Expected to finish

2009-01-01

Last updated by the study team

2016-11-22

Who can join

Age: 18 and older, up to 65. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• Subjects needing a crown on a posterior tooth that is opposed by a natural tooth.

You may not qualify if…

• Subjects must be over 18 years of age with good overall health. No contraindications to dental treatment must be present.
• Subjects must have overall good dental health with no active tooth decay (caries) present and no periodontal disease. Pocket depth on all remaining teeth must not be more than 4 mm.
• Subjects must have no existing temporomandibular disorder, (e.g. clicking, popping, pain on opening) or parafunctional habits (e.g. bruxism, clenching)
• Subjects must need a crown on either a second premolar, first molar or second molar on any arch. Abutment teeth must be restorable and have a crown root ratio of at least 1:1. Abutment teeth must have a complement of opposing non-restored or minimally restored natural teeth. Minimally restored means nothing beyond a Class II amalgam restoration. Opposing arch cannot be a full coverage restoration or a partial denture. Contralateral tooth must be preferably present.
• Subjects must exhibit good oral hygiene and compliance.
• Subjects must not have any existing condition that could limit the flow of saliva; e.g. saliva flow must be of normal quantity.

Where it is running

• University of Texas Health Science Center at San Antonio — San Antonio, Texas, United States

Full record on ClinicalTrials.gov

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