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Mr Chris O'Connor


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Be Part of Research - Trial Details - A two year clinical follow up of the single visit crown, comparing two different placement techniques
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A two year clinical follow up of the single visit crown, comparing two different placement techniques

Not Recruiting

Open to: All Genders

Age: Adult

Newcastle upon Tyne

Medical Conditions

Dental caries/occlusal trauma

This information is provided directly by researchers and we recognise that it isn't always easy to understand. We are working with researchers to improve the accessibility of this information.


A crown restoration is a type of dental treatment which completely caps or encircles a tooth or dental implant. The adult dental health survey in 2009 suggested that 37% of adults who still had teeth in England Wales and Northern Ireland had at least one crown restoration. There is an estimated 47.6 million crowns across England, Wales and Northern Ireland. The single visit crown is a new technique which can be made and fitted in a single visit to the dentist. They promise to offer a long-lasting restoration that looks good and costs less than a traditional crown (for which impressions need to be taken and a temporary solution used until the crowns are ready). The aim of this study is to assess how easy the crowns are to make and how well the crowns perform over a short period.

Start dates may differ between countries and research sites. The research team are responsible for keeping the information up-to-date.  

The recruitment start and end dates are as follows:

01 Sep 2016 30 Aug 2017

Participants are randomly allocated to one of two groups. Both groups receive the same single visit crown (SVC) but have it fitted using different techniques. For all participants, the treatment sessions involve a single operator preparing and fitting the crown. The operator finds out which group the patient has been allocated to only when the tooth has been prepared and is ready to receive the crown. The crown is then manufactured and tested for its fit. The crown isn’t cemented in place unless both patient and operator are entirely satisfied with it. The operator records how well the crown fits before it is cemented in place and a series of photographs are taken. For participants in the first group, the single visit crown will be shaped entirely on the prepared tooth in the patients mouth (this is called the direct method). For participants in the second group, the crown is shaped party in the mouth but also in part on a replica model of the tooth made by the dentist (this is called the indirect technique). The subject will then return to the clinic for regular checks on the crown: at baseline (after 7-28 days), 6 months, 1 year and 2 years. They also complete satisfaction questionnaires about the crowns on each review and have a series of photographs taken of their mouths and replica models of the crowns taken.


Adults who need to have at least one crown.

You can take part if:



You may not be able to take part if:


1. Lack of capacity to be able to consent to the research project and/or inability to follow study instructions2. Known allergies or idiosyncratic responses to any product used during the study3. A complicating medical condition (e.g. infectious disease, blood coagulation disorder, risk of endocarditis, general weakened immunity, oral pathology, chronic diseases, requiring use of antibiotic before treatment)4. Participation in another dental research study within the last month5. Requiring extensive treatment prior to the provision of the fixed restoration6. Active primary disease; caries or symptoms of pulpal or apical pathology to the remaining teethirreversibly compromised structural integrity of the dentition that cannot be restored as part of the provision of treatment7. A history of advanced periodontal disease with teeth of grade two or three mobile


Below are the locations for where you can take part in the trial. Please note that not all sites may be open.

  • Newcastle Dental Hospital
    Richardson Road
    Newcastle upon Tyne
    NE2 4AZ

There are no direct benefits or risks involved with participating in this study.

Mr Chris O'Connor



The study is sponsored by Newcastle upon Tyne Hospitals Trust and funded by 3M ESPE.



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Read full details for Trial ID: ISRCTN17542282
Last updated 01 February 2021

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