Clinical performance of double crown retained dentures using conical all-ceramic primary crowns

ISRCTN ISRCTN94719711
DOI https://doi.org/10.1186/ISRCTN94719711
Secondary identifying numbers 177/13
Submission date
21/10/2018
Registration date
07/11/2018
Last edited
08/11/2019
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Oral Health
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Record updated in last year

Plain English summary of protocol

Background and study aims
The treatment of patients with a reduced number of teeth is an important part of daily practice. There are several treatment options. Double-crown-retained dentures (DCRDs) have a natural appearance and as a result, these dentures are very popular. Additionally, most of patients with DCRDs report a high level of chewing comfort due to very high prosthesis retention. DCRDs also permit the inclusion of existing teeth and implants. Studies already shown improvement in oral health and quality of life for patients using DCRDs.
However the manufacturing process of these dentures is not consistent. DCRDs are composed of a primary crown attached in patients mouth and a secondary crown located in the denture. There are different shapes of primary crowns, including conical and cylindrical. Prosthesis retention is provided by the friction between the primary crown (patients mouth) and secondary crowns (denture). However, a need for friction adjustments or even a loss of retention has often been described. As a result, patients can have problems handling these dentures. The Weigl protocol describes a manufacturing process for these dentures using an all-ceramic primary crown and an electroplated secondary crown, which helps to reduce changes in retention during the lifetime of the denture. The aim of this study is to verify the survival rates, complications and maintenance needs of DCRDs manufactured according to the Weigl protocol.

Who can participate?
Anyone who received DCRDs according to the Weigl protocol at the Department of Prosthodontics of the University of Frankfurt am Main, Germany between June 1998 and December 2013

What does the study involve?
There is no direct involvement of participants in this study, as their patient sheets are used for assessment of survival rates, complications and maintenance needs.

What are the benefits and risks of participating?
There are no direct benefits or risks of participating in this study as it does not require direct participant involvement. The results of this study may benefit future patients requiring DCRDs as it may improve success rates and reduce the number of complications.

Where is the study run from?
ZZMK (Carolinum), Goethe University Frankfurt (Germany)

When is the study starting and how long is it expected to run for?
January 2013 to June 2017

Who is funding the study?
Self-funded

Who is the main contact?
Dr. Silvia Brandt
hajjaj@med.uni-frankfurt.de

Contact information

Dr Silvia Brandt
Scientific

Theodor-Stern-Kai 7
Frankfurt
60596
Germany

ORCiD logoORCID ID 0000-0001-5530-0412

Study information

Study designObservational retrospective cohort study
Primary study designObservational
Secondary study designCohort study
Study setting(s)Hospital
Study typeTreatment
Participant information sheet Not available in web format, please use contact details to request a participant information sheet
Scientific titleLong-term clinical success of conical electroplated double-crown-retained dentures on implants or natural abutments up to 11.5 years: a retrospective study
Study objectivesDentures created with the conical electroplating concept is an alternative to other approaches, especially for combined tooth/implant-supported dentures.
Ethics approval(s)Ethics Committee of University Frankfurt, 13/05/2013, reference 177/13
Health condition(s) or problem(s) studiedReduced dentition in upper and lower jaw
InterventionFor data collection, the sheets of patients who received double-crown-retained dentures (DCRDs) between June 1998 and December 2013 were evaluated for failure of DCRDs, necessary repairs, pressure source, occlusal adjustments, problems with denture removal, relining needs and maintenance needs related to the denture abutments.
Intervention typeProcedure/Surgery
Primary outcome measureFailure of DCRDs (defined as the loss of the denture), evaluated by reviewing patient notes
Secondary outcome measuresThe following were evaluated by reviewing patient notes from patients between June 2013 and December 2013:
1. Necessary repairs to dentures
2. Pressure source
3. Occlusal adjustments
4. Problems with denture removal
5. Relining needs
6. Maintenance needs related to the denture abutments
Overall study start date01/01/2013
Completion date15/06/2017

Eligibility

Participant type(s)Patient
Age groupAll
Lower age limit18 Years
Upper age limit91 Years
SexBoth
Target number of participants100
Key inclusion criteria1. Dentures fabricated according to the Weigl protocol
2. Regular ttendance of follow-up exams
3. Tooth-supported DCRDs
4. Implant-supported DCRDs
5. Combined tooth/implant-supported DCRDs
6. Conical implant/abutment connections
7. Aged 18-91 years
Key exclusion criteriaNot treated according to the Weigl protocol
Date of first enrolment15/06/2013
Date of final enrolment15/12/2013

Locations

Countries of recruitment

  • Germany

Study participating centre

ZZMK (Carolinum) , Goethe University Frankfurt
Theodor-Stern-Kai 7
Frankfurtam Main
60596
Germany

Sponsor information

Goethte University Frankfurt
University/education

Theodor-Stern-Kai 7
Frankfurt
60596
Germany

ROR logo "ROR" https://ror.org/04cvxnb49

Funders

Funder type

Other

Investigator initiated and funded

No information available

Results and Publications

Intention to publish date10/11/2018
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryNot expected to be made available
Publication and dissemination planPlanned publication in Clinical Implant Dentistry and Related Research
IPD sharing planThe datasets generated during and/or analysed during the current study are not expected to be made available due to data protection regulations

Editorial Notes

08/11/2019: Internal review.
23/11/2018: Internal review.