Clinical Study on Zirconia Bridges
This trial is active, not recruiting.
|Treatment||zirconia bridge restoration|
|Sponsor||University of Siena|
|Start date||January 2010|
|End date||June 2015|
|Trial size||9 participants|
|Trial identifier||NCT01835834, T-159|
To evaluate the clinical performance and survival rate of NobelProceraTM Bridge Shaded Zirconia on natural teeth in the posterior region for a period of 5 years. The working hypothesis of this clinical study is that industrial centrally produced 3- or 4-unit bridges of shaded yttrium-oxide partially-stabilized (Y-TZP) zirconia (NobelProceraTM Shaded Zirconia) in combination with a veneering ceramic material will show sufficient CDA ratings (80% R+S) and a sufficient survival rate (93%) after 5 years in comparison with a reference level of 95%.
|Intervention model||single group assignment|
survival rate of NobelProcera™ Bridge Shaded Zirconia
time frame: 5 years
Male or female participants from 18 years up to 70 years old.
Inclusion Criteria: The subject must be at least 18 (or age of consent), and less than 70 at the time of inclusion. - The subject is healthy and compliant with good oral hygiene - The subject is in need of a posterior fixed partial denture restoration of up to 4 units distal of the canines in the maxilla or mandible. - The subject shall have a stable occlusal relationship with a fully restored, fixed opposing dentition. - Obtained informed consent from the subject the subject should be available for the 5-year term of the investigation. - No apical disorder or inflammation of abutment teeth, adjacent and opposing teeth. - Good gingival / periodontal / periapical status of restoring, opposing and adjacent teeth. Healed situation of soft tissue augmentation is allowed. - The subject should be available for the 5-year term of the investigation. Exclusion Criteria: - The subject is not able to give her/his informed consent to participate. - Alcohol or drug abuse as noted in patient records or in patient history. - Reason to believe that the treatment might have a negative effect on the patient's total situation (psychiatric problems), as noted in patient records or in patient history. - An existing condition where acceptable retention of the restoration is impossible to attain - Mobility of the tooth to be restored. - Pathologic pocket formation of 4 mm or greater around the tooth to be restored - Severe bruxism or other destructive habits - Amount of attached soft tissue is insufficient (no attached gingiva on the buccal side of the tooth). - Health conditions, which do not permit the restorative procedure
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