Working… Menu
Help guide our efforts to modernize
Send us your comments by March 14, 2020.

Clinical Study on Zirconia Bridges

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01835834
Recruitment Status : Unknown
Verified July 2014 by Prof. Marco Ferrari, University of Siena.
Recruitment status was:  Active, not recruiting
First Posted : April 19, 2013
Last Update Posted : July 8, 2014
Information provided by (Responsible Party):
Prof. Marco Ferrari, University of Siena

Brief Summary:
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%.

Condition or disease Intervention/treatment Phase
Missing Teeth Procedure: zirconia bridge restoration Not Applicable

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 9 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Study Start Date : January 2010
Estimated Primary Completion Date : June 2015
Estimated Study Completion Date : December 2015

Resource links provided by the National Library of Medicine

Drug Information available for: Zirconium

Arm Intervention/treatment
Experimental: zirconia bridge restoration

The device is a ceramic core made of shaded zirconium with an anatomic contour core with a minimum of 0.6 mm** thickness and minimal connector size of 4.0 x 3.0 / 9.4 (height x width [mm] / area [mm2])** of high strength zirconia framework providing homogenous veneering material thickness as an external coating with 1.0 - 2.0 mm* wall thickness. The core is veneered with dental porcelain at the dental laboratory.

Intended use and indications:

NobelProceraTM Bridge Shaded Zirconia consists of an individualized, supporting substructure in a ceramic bridge construction for tooth/teeth replacement.

NobelProceraTM Bridge Zirconia is intended for patients in need of prosthetic oral reconstruction in order to restore chewing function. Zirconia bridges for natural tooth restorations are customized, designed, and milled from pre-sintered blanks of zirconia. The multi-unit restorations can be placed in all positions in the mouth.

Procedure: zirconia bridge restoration

Primary Outcome Measures :
  1. survival rate of NobelProcera™ Bridge Shaded Zirconia [ Time Frame: 5 years ]

    Success and Failure Criteria The CDA index will be used for the success criteria in this investigation. Please see also the criteria in the "clinical parameter" part of this protocol.

    The success and failure criteria to be used in this investigation have been determined as follows:

    A successful NobelProcera™ Bridge Shaded Zirconia is when:

    the CDA index is Romeo or Sierra at delivery and remains so during the study period.

    A surviving NobelProcera™ Bridge Shaded Zirconia is when:

    the restoration is in occlusion and in function, even though all the success criteria are not fulfilled, but is to be regarded as correctable.

    A failed NobelProcera™ Bridge Shaded Zirconia is when:

    the restoration has 1) been removed, 2) fractured, or 3) cannot be classified as a surviving or a successful restoration.

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

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

Layout table for additonal information
Responsible Party: Prof. Marco Ferrari, Professor, University of Siena Identifier: NCT01835834    
Other Study ID Numbers: T-159
First Posted: April 19, 2013    Key Record Dates
Last Update Posted: July 8, 2014
Last Verified: July 2014
Keywords provided by Prof. Marco Ferrari, University of Siena:
zirconia crown
Additional relevant MeSH terms:
Layout table for MeSH terms
Tooth Loss
Periodontal Diseases
Mouth Diseases
Stomatognathic Diseases
Tooth Diseases
Tooth Abnormalities
Stomatognathic System Abnormalities
Congenital Abnormalities