Removable Partial DentureNCT06564337
A Prospective Clinical Trial Evaluating Outcomes of Surveyed Zirconia Crowns
A study testing Surveyed zirconia crown in people with Removable Partial Denture and Dental Crown, run by Neena DSouza.
Trial summary
Zirconia has shown to be a suitable substitute for metal ceramic crowns when comparing survival, biological and technical complications. Evidence demonstrating the outcomes of surveyed zirconia crowns on removable partial denture abutments is unavailable. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Removable Partial Denture, Dental Crown
- What is being tested?
- Surveyed zirconia crown
- Type of treatment
- Medical device
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 50 participants
- Where
- No sites listed yet
- Study dates
- 6 Jan 2025to 31 Dec 2031
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
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
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Inclusion criteria: Patient recruitment will be from the adult patient population that presents to the undergraduate/graduate prosthodontic dental clinic requiring new tooth or tissue supported removable cast dental prostheses to replace missing teeth for the following situations:
- In Kennedy Class 1 and 2 tisuue supported RPD's-Terminal abutments 3,4,5,6
- In Kennedy Class 3 and 4 tooth supported RPD's- any abutment teeth selected will need to be documented if selected as abutments for a surveyed crown.
- Selection of abutment teeth for zirconia surveyed crowns will be similar to that currently utilized when selecting cast RPD abutments to be restored with either porcelain fused to metal or full metal surveyed crowns for tissue and tooth supported cast RPD's. Identifiable data will include:
- RPD abutment teeth which may benefit from full coverage due to large restorations.
- Posterior endodontically treated teeth with inadequate marginal ridge support and
Show all 9Show fewer
- Abutment teeth which require axial modification for RPD retentive and or stability elements.
- In situations where esthetic improvement is desirable
- Reasons for selection wil be documented.
Who cannot join
- Crowns that need to be splinted; patients that decline a surveyed crown; patients under the age of 18 years; patients that decline to participate in the study.
Trial locations and contacts
No sites are listed yet. Contact the study team or a site near you to ask about taking part.
About this study
Official title: A Prospective Clinical Trial Evaluating Outcomes of Surveyed Zirconia Crowns on Removable Partial Denture Abutment Teeth
Zirconia has shown to be a suitable substitute for metal ceramic crowns when comparing survival, biological and technical complications. Evidence demonstrating the outcomes of surveyed zirconia crowns on removable partial denture abutments is unavailable. Zirconia as a substitute for metal ceramic is being currently used for fabricating surveyed crowns although quantitative data evaluating its efficacy is sparse. The purpose of this prospective clinical trial is to evaluate clinical outcomes when zirconia is used as a full coverage restoration on removable partial denture abutments. The study will be designed as a 3-5 year prospective observational trial in the University of Toronto undergraduate clinic in a controlled environment. Outcomes measures will include survival, biological and technical complications. Descriptive statistics will be used to summarize patient characteristics and outcomes and for categorical variables frequency and percentages will be reported. A level of significance 0.05 will be used for inferential analysis, with p-values < 0.05 reported as statistically significant. It is expected that zirconia will demonstrate similar outcomes to traditional metal ceramic surveyed crowns.
Read the detailed description
Research data on the survival of zirconia crowns as RPD abutments is limited although anecdotally these are being used regularly by dentists in clinical practice. To our knowledge a clinical trial evaluating the outcomes of surveyed monolithic zirconia crowns as RPD abutments has not been investigated previously. We propose to evaluate the outcomes of surveyed zirconia crowns as RPD abutments in a prospective trial and compare the survival, biological and technical complications with alternative materials historically used for surveyed crowns.
Aims of Project
- To evaluate biological and technical complications of surveyed zirconia crowns on RPD abutments for 3- 5 years following insertion.
- To evaluate survival of surveyed zirconia crowns for 3- 5 years following insertion.
Materials and Methods
Research Design and Overview: The study will be designed as a 3-5 year prospective observational trial in the University of Toronto undergraduate clinic in a controlled environment where procedures are standardized for case selection and execution. All patients requiring surveyed crowns in the academic years 2024 and 2025 will be approached to participate in the trial. Patients will be recalled every year for 3-5 years following insertion and a check list will be used to assess the pre insertion and outcome variables. Clinical coordinators supervising students and clinical examiners performing outcome assessments at yearly follow up will be trained and their measurements calibrated for inter and intra observer variability to ensure uniformity. The research proposal will be submitted to the University Research Oversight and Compliance office for ethics approval.
Participant recruitment: Patient recruitment will be from the patient population that presents to the undergraduate dental clinic requiring removable dental prosthesis to replace missing teeth. Selection of abutment teeth for zirconia surveyed crowns will be similar to that currently utilized when selecting abutment teeth to be restored with either porcelain fused to metal or full metal surveyed crowns for tissue and tooth supported cast removable partial dentures. These will include but are not limited to abutment teeth which require full coverage due to large restorations, posterior endodontically treated teeth with inadequate marginal ridge support and abutment teeth which require axial modification for retentive and or stability elements of the denture.
Sample Size Calculation: This is an exploratory study and will include all patients in the undergraduate clinic requiring surveyed crowns. We expect approximately 25-50 surveyed crowns per year, based on numerical data for metal ceramic surveyed crowns done in previous years.
Methods: To avoid the inherent fractures associated with veneered zirconia surveyed crowns, monolithic zirconia a combination of 3Y-TZP and 5Y-TZP (IPS e.max ZirCAD Prime, Ivoclar AG) with a flexural strength of 1200MPa will be utilized. Tooth preparation will include occlusal reduction of 1.0 to 1.5mm and rounded line angles for fabrication of the rest seats within the zirconia crown and buccal and lingual reduction of 1 to 1.5mm to allow for adequate buccal and lingual contour to accommodate retentive clasp arms and minor connectors within the crown. Impressions for zirconia crowns will be made with polyvinyl siloxane in a full arch custom tray. The models will be surveyed to produce CAD CAM crowns on RPD abutments which will incorporate design elements such as heights of contour and rest seats. Once cemented and following cast removable partial denture insertion, patients will be followed every year up for 3-5 years to assess outcomes.
Data Collection:
Independent Variables: Variables to be collected will include demographic data, age, sex and smoking status. Abutment tooth, reason for crown (including endodontic treatment, large restoration, replacement crown, change of axial morphology, tooth sensitivity), pulp vitality, history of previous endodontic treatment, presence of post core if any, type of core, status of opposing tooth whether present or absent or opposed by removable or fixed prosthesis, presence or absence of proximal contacts and type of cement used at insertion. Post insertion variables will include any and all follow up dates, and procedures performed at follow up.
Statistical Analysis: Descriptive statistics will be used to summarize patient characteristics and outcomes. For categorical variables, the investigators will report frequency and percentages. Numerical variables will be summarized using mean, standard deviation (or median/IQR for skewed distributions). For primary clinical outcomes, the investigators will also report 95% confidence intervals.
Sample size permitting, the investigators may also examine the association between baseline/demographic patient characteristics and outcomes using inferential analysis (chi-square tests, logistic/linear regression models). A level of significance 0.05 will be used for inferential analysis, with p-values < 0.05 reported as statistically significant.
- Conditions
- Removable Partial Denture, Dental Crown
- Being tested
- Surveyed zirconia crown
- Keywords
- removable partial denture abutment, monolithic zirconia crown survival, surveyed zirconia crown
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Surveyed zirconia crownDevice
Patient recruitment will be from the patient population that presents to the undergraduate dental clinic requiring removable dental prosthesis (RPD) to replace missing teeth. Selection of abutment teeth for zirconia surveyed crowns will be similar to that currently utilized when selecting RPD abutments to be restored with either porcelain fused to metal or full metal surveyed crowns for tissue and tooth supported RPD's.
| Study group | Role | What they receive |
|---|---|---|
| Patients recruited for intervention | Experimental | A combination of 3Y-TZP and 5Y-TZP (IPS e.max ZirCAD Prime, Ivoclar AG) with a flexural strength of 1200MPa will be utilized for the crowns. Tooth preparation will include occlusal reduction of 1.0 to 1.2mm and rounded line angles for the rest seats within the zirconia crown and buccal and lingual reduction of 1 to 1.5mm to allow for adequate buccal and lingual contour to accommodate retentive clasp arms and minor connectors. Impressions for zirconia crowns will be made with polyvinyl siloxane on a full arch custom tray. After clinical verification crowns will be cemented with resin or resin modified glass ionomer cement Receives: Device: Surveyed zirconia crown |
What is being measured
The primary outcome is the main question the study is designed to answer.
Survival
- Survival will be recorded as the tooth with the crown still in function with or without 'clinical complications' during and up to the end of follow up. These will include but are not limited to
- occlusal adjustments,
- follow up sensitivity,
- open margins,
- recurrent decay,
- infection,
- endodontic treatment or retreatment,
- chipping of ceramic,
- recementation,
- non healing endodontic lesion,
- bone loss and associated periodontal problems.
Measured: study follow up- every year for 3-5 years
Biological Complications
Biological failures will be recorded when the tooth is no longer present in the mouth either because of
- tooth or core fracture rendering the tooth non restorable,
- or the tooth extracted because of caries, infection or periodontal disease.
Measured: study follow up- every year for 3-5 years
Technical Complications
Technical failures will be recorded when
- the zirconia crown fractures or
- needs to be replaced because of inadequate fit.
Measured: study follow up- every year for 3-5 years
Success
Success will be recorded as all surviving crowns with no clinical complications.
Measured: study follow up- every year for 3-5 years
Other complications
Not listed above
Measured: study follow up- every year for 3-5 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Aug 2024
- Study start6 Jan 2025 (estimated)
- Primary completion18 Dec 2026 (estimated)
- Study completion31 Dec 2031 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (9)Papers the sponsor has linked to this study.
- Other trials for Removable Partial DentureStudies 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
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Model description
- Research data on the survival of zirconia crowns as RPD abutments is limited although anecdotally these are being used regularly by dentists in clinical practice. To our knowledge a clinical trial evaluating the outcomes of surveyed monolithic zirconia crowns as RPD abutments has not been investigated previously. We propose to evaluate the outcomes of surveyed zirconia crowns as RPD abutments in a prospective trial and compare the survival, biological and technical complications with alternative materials historically used for surveyed crowns.
- Masking
- None (open label)
- Enrolment
- 50 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Neena DSouza
- Sponsor type
- University, hospital or other
- Collaborators
- University of Toronto
- Responsible party
- Sponsor-investigator, Neena DSouza, University of Toronto
- Investigators
- Eszter S Ganss, DDS, Study chair, Faculty of Dentistry, University of Toronto
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06564337
- Sponsor's protocol ID
- 00042791
- Status last verified
- Aug 2024
- First submitted
- 18 Aug 2024
- Last updated
- 23 Aug 2024
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data will be stored on secure university of Toronto servers and will be available only to researchers involved in the project
Publications
Kois DE, Isvilanonda V, Chaiyabutr Y, Kois JC. Evaluation of fracture resistance and failure risks of posterior partial coverage restorations. J Esthet Restor Dent. 2013 Apr;25(2):110-22. doi: 10.1111/jerd.12018. Epub 2013 Mar 19.
PubMed 23617385Goto M, Oki K, Koyano K, Ayukawa Y. The 3-year cumulative survival rates of posterior monolithic zirconia crowns and their antagonist teeth, and their influencing factors. J Oral Sci. 2022 Oct 1;64(4):286-289. doi: 10.2334/josnusd.22-0221. Epub 2022 Sep 14.
PubMed 36104182Burns DR, Unger JW. The construction of crowns for removable partial denture abutment teeth. Quintessence Int. 1994 Jul;25(7):471-5.
PubMed 7991768Turner CH, Smith BJ. The use of crowns to modify abutment teeth of removable partial dentures. 2. Clinical and laboratory procedures. J Dent. 1979 Jun;7(2):98-104. doi: 10.1016/0300-5712(79)90002-2. No abstract available.
PubMed 379070Behr M, Kolbeck C, Lang R, Hahnel S, Dirschl L, Handel G. Clinical performance of cements as luting agents for telescopic double crown-retained removable partial and complete overdentures. Int J Prosthodont. 2009 Sep-Oct;22(5):479-87.
PubMed 20095198Kopzon V, Raedel M. Outcomes of abutment teeth with double crowns over an observation period of 27 years. J Prosthodont Res. 2023 Oct 13;67(4):518-523. doi: 10.2186/jpr.JPR_D_22_00165. Epub 2022 Dec 17.
PubMed 36529501Igarashi Y, Goto T. Ten-year follow-up study of conical crown-retained dentures. Int J Prosthodont. 1997 Mar-Apr;10(2):149-55.
PubMed 9206455Sorensen JA, Martinoff JT. Endodontically treated teeth as abutments. J Prosthet Dent. 1985 May;53(5):631-6. doi: 10.1016/0022-3913(85)90008-3. No abstract available.
PubMed 3889302D'Souza NL, Jutlah EM, Deshpande RA, Somogyi-Ganss E. Comparison of clinical outcomes between single metal-ceramic and zirconia crowns. J Prosthet Dent. 2025 Feb;133(2):464-471. doi: 10.1016/j.prosdent.2024.02.028. Epub 2024 Apr 4.
PubMed 38580582
Study at a glance
From the registry record, last updated by the sponsor on 23 Aug 2024. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Prospective Clinical Trial Evaluating Outcomes of Surveyed Zirconia Crowns on Removable Partial Denture Abutment Teeth
- ClinicalTrials.gov ID
- NCT06564337
- Acronym / sponsor ID
- 00042791
- Conditions
- Removable Partial Denture, Dental Crown
- Keywords
- removable partial denture abutment, monolithic zirconia crown survival, surveyed zirconia crown
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 50 participants (estimated)
- Lead sponsor
- Neena DSouzaUniversity, hospital or other
- Collaborators
- University of Toronto
- Study start
- 6 Jan 2025 (estimated)
- Primary completion
- 18 Dec 2026 (estimated)
- Study completion
- 31 Dec 2031 (estimated)
- First posted
- 21 Aug 2024 (actual)
- 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.
Zirconia has shown to be a suitable substitute for metal ceramic crowns when comparing survival, biological and technical complications. Evidence demonstrating the outcomes of surveyed zirconia crowns on removable partial denture abutments is unavailable. Zirconia as a substitute for metal ceramic is being currently used for fabricating surveyed crowns although quantitative data evaluating its efficacy is sparse. The purpose of this prospective clinical trial is to evaluate clinical outcomes when zirconia is used as a full coverage restoration on removable partial denture abutments. The study will be designed as a 3-5 year prospective observational trial in the University of Toronto undergraduate clinic in a controlled environment. Outcomes measures will include survival, biological and technical complications. Descriptive statistics will be used to summarize patient characteristics and outcomes and for categorical variables frequency and percentages will be reported. A level of significance 0.05 will be used for inferential analysis, with p-values < 0.05 reported as statistically significant. It is expected that zirconia will demonstrate similar outcomes to traditional metal ceramic surveyed crowns.
Detailed description
Research data on the survival of zirconia crowns as RPD abutments is limited although anecdotally these are being used regularly by dentists in clinical practice. To our knowledge a clinical trial evaluating the outcomes of surveyed monolithic zirconia crowns as RPD abutments has not been investigated previously. We propose to evaluate the outcomes of surveyed zirconia crowns as RPD abutments in a prospective trial and compare the survival, biological and technical complications with alternative materials historically used for surveyed crowns.
Aims of Project
- To evaluate biological and technical complications of surveyed zirconia crowns on RPD abutments for 3- 5 years following insertion.
- To evaluate survival of surveyed zirconia crowns for 3- 5 years following insertion.
Materials and Methods
Research Design and Overview: The study will be designed as a 3-5 year prospective observational trial in the University of Toronto undergraduate clinic in a controlled environment where procedures are standardized for case selection and execution. All patients requiring surveyed crowns in the academic years 2024 and 2025 will be approached to participate in the trial. Patients will be recalled every year for 3-5 years following insertion and a check list will be used to assess the pre insertion and outcome variables. Clinical coordinators supervising students and clinical examiners performing outcome assessments at yearly follow up will be trained and their measurements calibrated for inter and intra observer variability to ensure uniformity. The research proposal will be submitted to the University Research Oversight and Compliance office for ethics approval.
Participant recruitment: Patient recruitment will be from the patient population that presents to the undergraduate dental clinic requiring removable dental prosthesis to replace missing teeth. Selection of abutment teeth for zirconia surveyed crowns will be similar to that currently utilized when selecting abutment teeth to be restored with either porcelain fused to metal or full metal surveyed crowns for tissue and tooth supported cast removable partial dentures. These will include but are not limited to abutment teeth which require full coverage due to large restorations, posterior endodontically treated teeth with inadequate marginal ridge support and abutment teeth which require axial modification for retentive and or stability elements of the denture.
Sample Size Calculation: This is an exploratory study and will include all patients in the undergraduate clinic requiring surveyed crowns. We expect approximately 25-50 surveyed crowns per year, based on numerical data for metal ceramic surveyed crowns done in previous years.
Methods: To avoid the inherent fractures associated with veneered zirconia surveyed crowns, monolithic zirconia a combination of 3Y-TZP and 5Y-TZP (IPS e.max ZirCAD Prime, Ivoclar AG) with a flexural strength of 1200MPa will be utilized. Tooth preparation will include occlusal reduction of 1.0 to 1.5mm and rounded line angles for fabrication of the rest seats within the zirconia crown and buccal and lingual reduction of 1 to 1.5mm to allow for adequate buccal and lingual contour to accommodate retentive clasp arms and minor connectors within the crown. Impressions for zirconia crowns will be made with polyvinyl siloxane in a full arch custom tray. The models will be surveyed to produce CAD CAM crowns on RPD abutments which will incorporate design elements such as heights of contour and rest seats. Once cemented and following cast removable partial denture insertion, patients will be followed every year up for 3-5 years to assess outcomes.
Data Collection:
Independent Variables: Variables to be collected will include demographic data, age, sex and smoking status. Abutment tooth, reason for crown (including endodontic treatment, large restoration, replacement crown, change of axial morphology, tooth sensitivity), pulp vitality, history of previous endodontic treatment, presence of post core if any, type of core, status of opposing tooth whether present or absent or opposed by removable or fixed prosthesis, presence or absence of proximal contacts and type of cement used at insertion. Post insertion variables will include any and all follow up dates, and procedures performed at follow up.
Statistical Analysis: Descriptive statistics will be used to summarize patient characteristics and outcomes. For categorical variables, the investigators will report frequency and percentages. Numerical variables will be summarized using mean, standard deviation (or median/IQR for skewed distributions). For primary clinical outcomes, the investigators will also report 95% confidence intervals.
Sample size permitting, the investigators may also examine the association between baseline/demographic patient characteristics and outcomes using inferential analysis (chi-square tests, logistic/linear regression models). A level of significance 0.05 will be used for inferential analysis, with p-values < 0.05 reported as statistically significant.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
- Model description
- Research data on the survival of zirconia crowns as RPD abutments is limited although anecdotally these are being used regularly by dentists in clinical practice. To our knowledge a clinical trial evaluating the outcomes of surveyed monolithic zirconia crowns as RPD abutments has not been investigated previously. We propose to evaluate the outcomes of surveyed zirconia crowns as RPD abutments in a prospective trial and compare the survival, biological and technical complications with alternative materials historically used for surveyed crowns.
| Arm | Type | Receives |
|---|---|---|
| Patients recruited for intervention | Experimental | Device: Surveyed zirconia crownA combination of 3Y-TZP and 5Y-TZP (IPS e.max ZirCAD Prime, Ivoclar AG) with a flexural strength of 1200MPa will be utilized for the crowns. Tooth preparation will include occlusal reduction of 1.0 to 1.2mm and rounded line angles for the rest seats within the zirconia crown and buccal and lingual reduction of 1 to 1.5mm to allow for adequate buccal and lingual contour to accommodate retentive clasp arms and minor connectors. Impressions for zirconia crowns will be made with polyvinyl siloxane on a full arch custom tray. After clinical verification crowns will be cemented with resin or resin modified glass ionomer cement |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (9 listed)
- Inclusion criteria: Patient recruitment will be from the adult patient population that presents to the undergraduate/graduate prosthodontic dental clinic requiring new tooth or tissue supported removable cast dental prostheses to replace missing teeth for the following situations:
Key exclusion criteria (1 listed)
- Crowns that need to be splinted; patients that decline a surveyed crown; patients under the age of 18 years; patients that decline to participate in the study.
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 |
|---|---|---|
| Surveyed zirconia crownPatient recruitment will be from the patient population that presents to the undergraduate dental clinic requiring removable dental prosthesis (RPD) to replace missing teeth. Selection of abutment teeth for zirconia surveyed crowns will be similar to that currently utilized when selecting RPD abutments to be restored with either porcelain fused to metal or full metal surveyed crowns for tissue and tooth supported RPD's. | Device | Patients recruited for intervention |
Primary outcome
Survival
Time frame: study follow up- every year for 3-5 years
A. Survival will be recorded as the tooth with the crown still in function with or without 'clinical complications' during and up to the end of follow up. These will include but are not limited to * occlusal adjustments, * follow up sensitivity, * open margins, * recurrent decay, * infection, * endodontic treatment or retreatment, * chipping of ceramic, * recementation, * non healing endodontic lesion, * bone loss and associated periodontal problems.
Biological Complications
Time frame: study follow up- every year for 3-5 years
Biological failures will be recorded when the tooth is no longer present in the mouth either because of * tooth or core fracture rendering the tooth non restorable, * or the tooth extracted because of caries, infection or periodontal disease.
Technical Complications
Time frame: study follow up- every year for 3-5 years
Technical failures will be recorded when * the zirconia crown fractures or * needs to be replaced because of inadequate fit.
Success
Time frame: study follow up- every year for 3-5 years
Success will be recorded as all surviving crowns with no clinical complications.
Other complications
Time frame: study follow up- every year for 3-5 years
Not listed above
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 23 Aug 2024.
- Background: PubMed 23617385Kois DE, Isvilanonda V, Chaiyabutr Y, Kois JC. Evaluation of fracture resistance and failure risks of posterior partial coverage restorations. J Esthet Restor Dent. 2013 Apr;25(2):110-22. doi: 10.1111/jerd.12018. Epub 2013 Mar 19.
- Background: PubMed 36104182Goto M, Oki K, Koyano K, Ayukawa Y. The 3-year cumulative survival rates of posterior monolithic zirconia crowns and their antagonist teeth, and their influencing factors. J Oral Sci. 2022 Oct 1;64(4):286-289. doi: 10.2334/josnusd.22-0221. Epub 2022 Sep 14.
- Background: PubMed 7991768Burns DR, Unger JW. The construction of crowns for removable partial denture abutment teeth. Quintessence Int. 1994 Jul;25(7):471-5.
- Background: PubMed 379070Turner CH, Smith BJ. The use of crowns to modify abutment teeth of removable partial dentures. 2. Clinical and laboratory procedures. J Dent. 1979 Jun;7(2):98-104. doi: 10.1016/0300-5712(79)90002-2. No abstract available.
- Background: PubMed 20095198Behr M, Kolbeck C, Lang R, Hahnel S, Dirschl L, Handel G. Clinical performance of cements as luting agents for telescopic double crown-retained removable partial and complete overdentures. Int J Prosthodont. 2009 Sep-Oct;22(5):479-87.
- Background: PubMed 36529501Kopzon V, Raedel M. Outcomes of abutment teeth with double crowns over an observation period of 27 years. J Prosthodont Res. 2023 Oct 13;67(4):518-523. doi: 10.2186/jpr.JPR_D_22_00165. Epub 2022 Dec 17.
- Background: PubMed 9206455Igarashi Y, Goto T. Ten-year follow-up study of conical crown-retained dentures. Int J Prosthodont. 1997 Mar-Apr;10(2):149-55.
- Background: PubMed 3889302Sorensen JA, Martinoff JT. Endodontically treated teeth as abutments. J Prosthet Dent. 1985 May;53(5):631-6. doi: 10.1016/0022-3913(85)90008-3. No abstract available.
- Background: PubMed 38580582D'Souza NL, Jutlah EM, Deshpande RA, Somogyi-Ganss E. Comparison of clinical outcomes between single metal-ceramic and zirconia crowns. J Prosthet Dent. 2025 Feb;133(2):464-471. doi: 10.1016/j.prosdent.2024.02.028. Epub 2024 Apr 4.
- Individual participant dataSharing planned: No. Individual participant data will be stored on secure university of Toronto servers and will be available only to researchers involved in the project
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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.
Eszter S Ganss, DDS study chair
Faculty of Dentistry, University of Toronto
Questions about this trial
What is this clinical trial studying?
A study testing Surveyed zirconia crown in people with Removable Partial Denture and Dental Crown, run by Neena DSouza.
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 9 inclusion and 1 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: opening soon, as of the sponsor's last update on 23 Aug 2024. Status can change between updates, so confirm with the study contact before making plans.
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?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Neena L D'SOUZA, DDS (4163996121, neena.dsouza@dentistry.utoronto.ca), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Survival (time frame: study follow up- every year for 3-5 years). The study lists 5 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT06564337, which also lists 9 linked publications.
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 23 Aug 2024.