Evaluation Of Zirconia Crowns Restoring Endodontically Treated Posterior Teeth With Two Finish Line Designs And Occlusal Reduction Schemes

April 9, 2022 updated by: Alaa Samir Fathy El-Ashkar, Cairo University
The aim of this study is to evaluate the clinical performance of two finish line designs (feather edge and rounded shoulder) in relation with two occlusal designs (flat and planar) in endodontically treated teeth restored with zirconia crowns.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Several studies have been investigating the effect of preparation design and its relation to the marginal adaptation. Habib et al 2014 compared the accuracy of marginal and internal adaptation of zirconia copings fabricated on anatomic (A), semi-anatomic (SA) and non-anatomic (NA) occlusal surface preparations. The internal & marginal fit were measured under electron microscope at 9 standardized areas .The anatomical occlusal preparation had better marginal and internal adaptation of Zr copings. Lima et al 2018 studied the influence of two different occlusal preparation designs on the marginal adaptation of CAD-CAM onlay restorations. The conventional anatomical occlusal preparation with a 1.2-mm modified shoulder finish line extending on the buccal surface and modified preparation flat cuspal reduction without shoulder finish line. The results showed that the conventional anatomical occlusal preparation had significantly better marginal adaptation than that of the flat cuspal preparation. Succeeding these studies, it was of interest to investigate whether or not the occlusal scheme could influence the marginal accuracy of the CAD/CAM crowns fabricated with Zirconia ceramic material.

Studies correlating between the finish line design and occlusal scheme in literature are scarce, with little evidence regarding their effect on precision fit properties of restorations. Abdullah et al 2017 evaluated the effect of using different finishing line designs with different occlusal surface reduction schemes on the vertical marginal fit of full contour CAD/CAM zirconia crown restorations. They found a direct correlation between both the finish line geometry and the occlusal design. In recent literature, the use of feather edge finish line with all ceramic restorations is a point of conflict. Fuzzi et al 2017 studied the nanoleakage and internal adaptations of lithium disilicate and zirconia crowns with featheredge finish lines. They recommended only zirconia with this finish line configuration due to its high fracture resistance when used in thin sections. Thus, the current study was conducted to examine this finish line effect on the marginal precision fit. Our hypothesis is there will be no difference in the clinical performance between the flat occlusal scheme with feather edge or rounded shoulder finish line and the planar occlusal scheme with rounded shoulder finish line configuration.

The rationale for carrying out the trial:

The influence of different tooth preparation designs can affect the success of the full coverage restorations. Still, there is no available research dealing with the effect of finishing line designs in combination with different occlusal reduction schemes on the marginal fit of full contour zirconia crowns.

Study Type

Interventional

Enrollment (Actual)

66

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Egypt
    • Manial
      • Cairo, Manial, Egypt, 17928
        • Faculty of Dentistry, Cairo University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

20 years to 50 years (ADULT)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • From 21-50 years old, be able to read and sign the informed consent document.
  • Have no active periodontal or periapical diseases.
  • Psychologically and physically able to withstand conventional dental procedures.
  • Maintenance of good oral hygiene.
  • Patients with teeth problems indicated for single posterior crowns:
  • Badly decayed teeth
  • Sufficient occluso-gingival tooth height
  • Endodontically treated teeth
  • No tooth mobility or grade 1 can be accepted.
  • No furcation involvement.
  • Able to return for follow-up examinations and evaluation.

Exclusion Criteria:

  • Patients with defective root canal treatment
  • Patient with active resistant periodontal diseases
  • Patients with poor oral hygiene and uncooperative patients
  • Pregnant women
  • Patients in the growth stage with partially erupted teeth
  • Psychiatric problems or unrealistic expectations
  • Lack of opposing dentition in the area of interest
  • Patients with bruxism.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: TREATMENT
  • Allocation: RANDOMIZED
  • Interventional Model: PARALLEL
  • Masking: TRIPLE

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
EXPERIMENTAL: flat occlusal reduction with feather edge finish
Other: Abutment with flat occlusal reduction with feather edge finish
Non vital teeth require a full coverage restoration to withstand the functional stresses and prevent any further destruction of tooth/crown complex. The zirconia all-ceramic crowns yield a high flexure strength and are used as an esthetic alternative to ceramo-metallic crowns. Several studies linked the effect of preparation designs to the survival of the restoration. Others, studied the effect of the finish line geometries as deep chamfer and shoulder on the marginal integrity of restorations. The feather edge finish line is used with zirconia crowns with limited data regarding its success. However, there is no presented research dealing with the effect of finishing line designs in combination with different occlusal reduction schemes on the marginal fit of full contour zirconia crowns.
Other Names:
  • Experimental: Abutment with flat occlusal reduction with shoulder finish line
EXPERIMENTAL: flat occlusal reduction with shoulder finish line
Other: Abutment with flat occlusal reduction with feather edge finish
Non vital teeth require a full coverage restoration to withstand the functional stresses and prevent any further destruction of tooth/crown complex. The zirconia all-ceramic crowns yield a high flexure strength and are used as an esthetic alternative to ceramo-metallic crowns. Several studies linked the effect of preparation designs to the survival of the restoration. Others, studied the effect of the finish line geometries as deep chamfer and shoulder on the marginal integrity of restorations. The feather edge finish line is used with zirconia crowns with limited data regarding its success. However, there is no presented research dealing with the effect of finishing line designs in combination with different occlusal reduction schemes on the marginal fit of full contour zirconia crowns.
Other Names:
  • Experimental: Abutment with flat occlusal reduction with shoulder finish line
NO_INTERVENTION: planar occlusal reduction with shoulder finish line

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
clinical performance in terms of the marginal adaptation of the groups
Time Frame: One-Year
examination will follow the USPHS criteria.
One-Year

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
the fracture of the restoration
Time Frame: One-year
examination will follow the USPHS criteria.
One-year
marginal discoloration
Time Frame: One-year
examination will follow the USPHS criteria.
One-year
secondary caries
Time Frame: One-year
examination will follow the USPHS criteria.
One-year
gingival response
Time Frame: One-year
examination will follow the gingival index criteria
One-year

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Cairo University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (ACTUAL)

October 1, 2019

Primary Completion (ACTUAL)

July 31, 2021

Study Completion (ACTUAL)

October 1, 2021

Study Registration Dates

First Submitted

August 7, 2019

First Submitted That Met QC Criteria

August 8, 2019

First Posted (ACTUAL)

August 9, 2019

Study Record Updates

Last Update Posted (ACTUAL)

April 15, 2022

Last Update Submitted That Met QC Criteria

April 9, 2022

Last Verified

April 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CEBC-CU-2019915

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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