Dental CariesNCT02735304
Clinical Study 3MESPE Crowns CR15/02
A study testing Impression intervention in people with Dental Caries, run by Sheffield Teaching Hospitals NHS Foundation Trust at 1 site in United Kingdom.
Trial summary
This clinical study seeks to address four independent questions that are all part of the delivery of care associated with the provision of a single item of treatment; an indirect restoration (known as a 'crown') to restore and cover a damaged tooth. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Dental Caries
- What is being tested?
- Impression intervention
- Type of treatment
- Pill or oral medicine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 20 participants
- Where
- 1 siteUnited Kingdom
- Study dates
- 26 Feb 2016to 3 Jul 2021
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Patients in need of at least one full-coverage posterior restoration (crown) in a permanent premolar or molar.
- If two teeth in opposing arches are in need of a full-coverage posterior restoration (crown) only the tooth or teeth in one arch will be included in the study.
Who cannot join
- Patients who are unable to give informed consent or vulnerable population as defined in ISO 14155 will not be enrolled.
- Patients with contraindications as described in the 'Instructions for Use' of the study materials
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Clinical Pilot Study of: Astringent Retraction Paste, Imprint™ 4 VPS, Imprint 4™ Preliminary, Intra-oral Syringes, 3M ESPE New Temporary Restoration (SuPro 100 and Temporary Cement), RelyX™ Unicem™ 2 Automix Cement, Lava™ Plus Zirconia Crowns
This clinical study seeks to address four independent questions that are all part of the delivery of care associated with the provision of a single item of treatment; an indirect restoration (known as a 'crown') to restore and cover a damaged tooth. The provision of a crown requires a series of sequential clinical and laboratory stages stages:
- Stage 1 - Preliminary impression. Taking a pre-operative impression of the tooth to be crowned. This will be used to enable the fabrication of the temporary crown after the tooth has been prepared. This is standard care and follows established clinical protocols.
- Stage 2 - Preparation of the tooth. This involves cutting the tooth back to make space for the crown that will be fabricated to replace the missing structure.
- Stage 3 - Taking an impression of the prepared tooth. From this a duplicate model will be made to fabricate the crown. To take the impression, the dentist will need to gently push the gums away from the tooth by fractions of a millimeter so that the margins of the preparation are clearly discernible.
- Stage 4 - Provision of a temporary restoration that will provide satisfactory function for a limited period of time, until the definitive crown can be fitted. This temporary crown is designed to have a finite short-term durability and have an ease of manufacture and subsequent removal; hence the use of a specific cement that will enable this.
- Stage 5 - Fitting of the definitive restoration. This is designed to be a durable restoration, with a mean life expectancy measured in years, but which is ultimately determined by a number of clinical, biological and patient specific parameters. Definitive restorations are fitted with cement designed to retain the crown in permanent manner.
- Conditions
- Dental Caries
- Being tested
- Impression intervention
- Medical subject headings
- Dental Caries
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Impression interventionOther
The 1st intervention will compare two clinical impression techniques The Innovation treatment arm will receive the innovation treatment first and then crossover to receive the standard clinical practice treatment. The standard clinical practice treatment will receive the standard clinical practice treatment first and then crossover to receive the innovation treatment.
| Study group | Role | What they receive |
|---|---|---|
| Innovation treatment 3M ESPE materials | Other | The Innovation treatment arm will receive the innovation treatment first and then crossover to receive the standard clinical practice treatment during the Impression intervention.
Materials to be used all 3M ESPE - Astringent Retraction Paste, Imprint™ 4 Preliminary, Imprint™4 VPS, Imprint™ 4 Bite, Intra-oral syringes, Impression Tray, Receives: Other: Impression intervention |
| standard clinical practice treatment | Other | The standard clinical practice treatment will receive the standard clinical practice treatment first and then crossover to receive the innovation treatment during the Impression intervention
Materials as per the operating dentist's choice to be recorded on CRF Receives: Other: Impression intervention |
What is being measured
The primary outcome is the main question the study is designed to answer.
Assessment of the predictability
Assessment of the predictability of results as a function of accuracy of the resulting model, the dentist's judgment on the quality of impression and the accuracy of fit of the definitive restoration (Lava™ Plus Zirconia crown). Predictability is defined as the frequency in which an adequate result is obtained in a consistent manner
Measured: 48 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Apr 2016 (estimated)
- Study start26 Feb 2016
- Primary completion3 Jul 2021
- Study completion3 Jul 2021
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Dental CariesStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Enrolment
- 20 participants (actual)
Sponsor and investigators
- Lead sponsor
- Sheffield Teaching Hospitals NHS Foundation Trust
- Sponsor type
- University, hospital or other
- Collaborators
- 3M ESPE
- Responsible party
- Sponsor
- Investigators
- Nicolas Martin, Professor, Principal investigator, Sheffield Teaching Hospitals NHS FT
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02735304
- Sponsor's protocol ID
- STH18492
- Status last verified
- Oct 2026
- First submitted
- 1 Mar 2016
- Last updated
- 6 Oct 2026
- Results posted
- No
- Data monitoring committee
- No
- Individual data sharing
- No: no plans to share data
Study at a glance
From the registry record, last updated by the sponsor on 6 Oct 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Clinical Pilot Study of: Astringent Retraction Paste, Imprint™ 4 VPS, Imprint 4™ Preliminary, Intra-oral Syringes, 3M ESPE New Temporary Restoration (SuPro 100 and Temporary Cement), RelyX™ Unicem™ 2 Automix Cement, Lava™ Plus Zirconia Crowns
- ClinicalTrials.gov ID
- NCT02735304
- Acronym / sponsor ID
- STH18492
- Conditions
- Dental Caries
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 20 participants (actual)
- Lead sponsor
- Sheffield Teaching Hospitals NHS Foundation TrustUniversity, hospital or other
- Collaborators
- 3M ESPE
- Study start
- 26 Feb 2016 (actual)
- Primary completion
- 3 Jul 2021 (actual)
- Study completion
- 3 Jul 2021 (actual)
- First posted
- 12 Apr 2016 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This clinical study seeks to address four independent questions that are all part of the delivery of care associated with the provision of a single item of treatment; an indirect restoration (known as a 'crown') to restore and cover a damaged tooth. The provision of a crown requires a series of sequential clinical and laboratory stages stages:
- Stage 1 - Preliminary impression. Taking a pre-operative impression of the tooth to be crowned. This will be used to enable the fabrication of the temporary crown after the tooth has been prepared. This is standard care and follows established clinical protocols.
- Stage 2 - Preparation of the tooth. This involves cutting the tooth back to make space for the crown that will be fabricated to replace the missing structure.
- Stage 3 - Taking an impression of the prepared tooth. From this a duplicate model will be made to fabricate the crown. To take the impression, the dentist will need to gently push the gums away from the tooth by fractions of a millimeter so that the margins of the preparation are clearly discernible.
- Stage 4 - Provision of a temporary restoration that will provide satisfactory function for a limited period of time, until the definitive crown can be fitted. This temporary crown is designed to have a finite short-term durability and have an ease of manufacture and subsequent removal; hence the use of a specific cement that will enable this.
- Stage 5 - Fitting of the definitive restoration. This is designed to be a durable restoration, with a mean life expectancy measured in years, but which is ultimately determined by a number of clinical, biological and patient specific parameters. Definitive restorations are fitted with cement designed to retain the crown in permanent manner.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Innovation treatment 3M ESPE materials | Other | Other: Impression interventionThe Innovation treatment arm will receive the innovation treatment first and then crossover to receive the standard clinical practice treatment during the Impression intervention. Materials to be used all 3M ESPE - Astringent Retraction Paste, Imprint™ 4 Preliminary, Imprint™4 VPS, Imprint™ 4 Bite, Intra-oral syringes, Impression Tray, |
| standard clinical practice treatment | Other | Other: Impression interventionThe standard clinical practice treatment will receive the standard clinical practice treatment first and then crossover to receive the innovation treatment during the Impression intervention Materials as per the operating dentist's choice to be recorded on CRF |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- Patients in need of at least one full-coverage posterior restoration (crown) in a permanent premolar or molar.
- If two teeth in opposing arches are in need of a full-coverage posterior restoration (crown) only the tooth or teeth in one arch will be included in the study.
Key exclusion criteria (2 listed)
- Patients who are unable to give informed consent or vulnerable population as defined in ISO 14155 will not be enrolled.
- Patients with contraindications as described in the 'Instructions for Use' of the study materials
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Impression interventionThe 1st intervention will compare two clinical impression techniques The Innovation treatment arm will receive the innovation treatment first and then crossover to receive the standard clinical practice treatment. The standard clinical practice treatment will receive the standard clinical practice treatment first and then crossover to receive the innovation treatment. | Other | Innovation treatment 3M ESPE materials, standard clinical practice treatment |
Primary outcome
Assessment of the predictability
Time frame: 48 months
Assessment of the predictability of results as a function of accuracy of the resulting model, the dentist's judgment on the quality of impression and the accuracy of fit of the definitive restoration (Lava™ Plus Zirconia crown). Predictability is defined as the frequency in which an adequate result is obtained in a consistent manner
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 6 Oct 2026.
- Individual participant dataSharing planned: No. no plans to share data
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Nicolas Martin, Professor principal investigator
Sheffield Teaching Hospitals NHS FT
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Impression intervention in people with Dental Caries, run by Sheffield Teaching Hospitals NHS Foundation Trust at 1 site in United Kingdom.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 6 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Assessment of the predictability (time frame: 48 months). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 6 Oct 2026; AzTrials last refreshed its copy on 30 Oct 2026.