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Clinical Trial of Zirconia and Metal Adhesive 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: NCT01347177
Recruitment Status : Unknown
Verified January 2011 by Queen Mary University of London.
Recruitment status was:  Not yet recruiting
First Posted : May 4, 2011
Last Update Posted : February 9, 2012
Information provided by:
Queen Mary University of London

Brief Summary:

Adhesive bridges are becoming popular in patients with congenitally missing teeth and these are type of bridges that can be done with only minimal or with no preparation to replace the missing tooth/teeth. The best clinical gain is the minimal tooth preparation or no need for the removal of tooth substance. Treatment for this type of bridges does not usually require anaesthesia. In addition, adhesive bridges can provide reasonable aesthetical outcome with minimal cost and reduced chair time.

The biggest issue is that high failure rate in the long term, and gray colour shining through the metal wing cemented onto the abutment tooth. This can compromise the aesthetical outcome. The aesthetical problem can be solved by the use of zirconia all ceramic material to construct the bridge.

Condition or disease Intervention/treatment Phase
Missing Teeth Procedure: Zirconia-based adhesive bridge Procedure: Metal-based adhesive bridge Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 176 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Official Title: A Single-centre Randomised Controlled Clinical Trial of Zirconia-based Versus Metal-based Adhesive Bridges for Replacing 2 Missing Teeth or Less in Adults.
Study Start Date : April 2012
Estimated Primary Completion Date : April 2018
Estimated Study Completion Date : April 2018

Resource links provided by the National Library of Medicine

Drug Information available for: Zirconium

Arm Intervention/treatment
Experimental: Zirconia-based adhesive bridges
Patients in this group will be treated with the employment of zirconia-based adhesive bridges to replace the missing tooth/teeth.
Procedure: Zirconia-based adhesive bridge
Zirconia-based adhesive bridge will be used to replace the missing tooth/teeth.

Experimental: Metal-based adhesive bridges
Patients in this group will be treated with the employment of metal-based adhesive bridges.
Procedure: Metal-based adhesive bridge
The metal-based adhesive bridge will be used to replace the missing tooth/teeth.

Primary Outcome Measures :
  1. Clinical survival of adhesive bridges [ Time Frame: 5 Years ]
    Evaluation of clinical survival: participants will be evaluated according to the modified USPHS criteria. The evaluation criteria will include: retention, framework fracture, veneering fracture, marginal adaptation, recurrent caries and colour match. The examination will be after one to two weeks, after 3, 6, 9, 12 and 18 months, 2, 3, 4 and 5 years. The evaluation will also include the biological complication. Plaque, gingival index, periodontal probing depth and gingival recession will be evaluated around the abutments and compared to a control tooth

Secondary Outcome Measures :
  1. Quality of life, aesthetic outcome. [ Time Frame: 18 months ]
    The patients will be requested to fill the OHIP-14 and the VAS questionnaires after one week to two weeks, after 3, 6, 9, 12 and 18 months in order to assess the quality of their lives and their aesthetic outcome after having the bridge.

  2. Marginal discrepancy evaluation. [ Time Frame: After cementation ]
    Marginal discrepancy will be evaluated by means of Scannining Electron Microscope (SEM) after cementation.

  3. Economic evaluation [ Time Frame: 5 years ]
    Economic evaluation will be run in parallel to the study and will include the overall cost of the two treatments.

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.

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Ages Eligible for Study:   18 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Male or female ≥ 18 years of age
  • Has a maximum of 2 units requiring placement
  • Is a regular dental attendee and agree to return for assessments
  • Written subject informed consent (IC) for this protocol will be obtained prior to study enrolment. Each subject will be required to sign and date the IC form prior to their participation
  • Sound or minimally restored abutment(s)

Exclusion Criteria:

  • The presence of any periodontal pocket depths equal or above 4 mm with active periodontal disease
  • Any history of adverse reaction to clinical materials to be used in this study
  • They are pregnant or had serious medical condition that may interfere with the dental treatment
  • Acquired tooth loss more than 2 units requiring replacement
  • Participants who have parafunctional habits
  • Severe Class II Div II cases

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01347177

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Contact: Amani Agha, BDs,MSc

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United Kingdom
Barts and The London, School of Medicine and Dentistry
London, United Kingdom, E1 2AD
Contact: Amani Agha   
Sponsors and Collaborators
Queen Mary University of London
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Principal Investigator: Aylin Baysan, BDS, MSc, PhD Queen Mary University of London
Study Director: Amani Agha, BDS,MSc Queen Mary University of London

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Responsible Party: Dr Aylin Baysan., Queen Mary University of London. Identifier: NCT01347177    
Other Study ID Numbers: 100298307
First Posted: May 4, 2011    Key Record Dates
Last Update Posted: February 9, 2012
Last Verified: January 2011
Additional relevant MeSH terms:
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Tooth Loss
Periodontal Diseases
Mouth Diseases
Stomatognathic Diseases
Tooth Diseases
Tooth Abnormalities
Stomatognathic System Abnormalities
Congenital Abnormalities