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Clinical Trial Summary

The aim of this study is to evaluate the antagonist enamel wear of two processing options of Celtra duo crowns (polished and glaze fired) restoring posterior teeth in comparison with sound enamel wear at baseline and 6 months


Clinical Trial Description

Adhesive dental ceramics have proven to guarantee optimal esthetic results alongside satisfactory mechanical properties. Due to these qualities, today they are considered the first-choice restorative materials both for minimal restorations and for the reconstruction of severely compromised teeth. Gold alloy reconstructions preferred in the past, especially for their optimal wear properties, have been progressively substituted by these new materials. Loss of hard tooth substance is a natural process taking place during mastication. Also, Increased wear is a common reason of failure for restorations exposed to masticatory forces. Excessive wear may be responsible for numerous problems, such as hypersensitivity, loss of occlusal contact, defects of the periodontium, reduction of masticatory efficiency, tooth migration and wrong tooth relations, weakness of masticatory muscles, and changes in the vertical and horizontal jaw relations, which may cause functional and esthetic impairments. An optimal restorative material should provide similar characteristics to natural dental tissues. The physiological wear of enamel and dentin should represent the reference for a reasonable wear pattern of restorative materials The manufacturers tend to improve the mechanical behavior of their products leads to the progressive offer of new ceramics for daily practice. Assessment of their wear behavior and comparison through detailed tests become necessary at this point. comparing the wear of enamel opposing polished zirconia, polished lithium disilicate crowns opposing to natural tooth. Patients were recalled after 1year and impression were recorded with opposing arch and baseline and final cast were scanned and superimposed using 3 D scanner. They found that the mean of occlusal wear of the antagonistic enamel of polished zirconia was 42.0 μm, Enamel wear against natural antagonist (control group) 34.68 μm, whereas, for Enamel wear against polished lithium disilicate crowns (group 2) 40.06 μm Enamel wear against natural antagonist (control group) 35.09 μm. studying the quality of CAD/CAM fabricated single tooth restorations (Ten zirconia restorations were compared to 12 metal ceramic and 10 lithium disilicate counterparts). They found that were no significant differences between the studied crown systems. No difference of the gingival response among the different crown systems. Eighty percent of zirconia crowns needed no occlusal adjustment; also it showed the least amount of marginal discrepancy. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT04914962
Study type Interventional
Source Cairo University
Contact Ibrahim S Rady, Master
Phone 0201099576840
Email ibrahim.rady@dentistry.cu.edu.eg
Status Not yet recruiting
Phase N/A
Start date July 10, 2021
Completion date July 1, 2022

See also
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Completed NCT04839640 - Study of Wear in Composite Resin and Reinforced Acrylic Denture Teeth Used in Complete Denture Construction for Completely Edentulous Patients N/A
Recruiting NCT04838483 - Clinical Performance of Posterior Indirect Adhesive Restorations N/A
Recruiting NCT05637619 - Natural Dentition, Prosthesis and Antagonist Wear 3D Analysis
Active, not recruiting NCT03624894 - Intraoral Impressions for Assessment of Wear of Teeth and Restorative Materials.
Recruiting NCT04293770 - Clinical Evaluation of Posterior Indirect Adhesive Restorations N/A