Clinical Evaluation of Monolithic Zirconia Crowns
- Conditions
- Dental Materials
- Interventions
- Procedure: Metal-ceramicProcedure: Monolithic zirconia
- Registration Number
- NCT04943315
- Lead Sponsor
- Universidad Complutense de Madrid
- Brief Summary
The objectives of the present study are to compare the survival rates and possible biological and technical complications of metal-ceramic, and monolithic third-generation zirconia posterior crowns. The null hypothesis is that no differences would be found between the parameters studied for each type of restoration.
- Detailed Description
Seventy patients requiring at least one crown in the posterior region of the maxilla or mandible were included in this study. All subjects were recruited from the Master in Buccofacial Prostheses and Occlusion (Faculty of Odontology, University Complutense of Madrid, Spain). Before treatment, patients were informed of the study objectives, clinical procedures, materials used, advantages and possible risks of the ceramic material, and other therapeutic alternatives. Prior to the study, participants were asked to provide written informed consent. Seventy posterior crowns were produced and allocated in parallel and randomly to either monolithic third-generation zirconia, or metal-ceramic (MC) restorations. The clinical procedures were performed by two experienced clinicians. All participants received oral hygiene instructions and a professional tooth cleaning prior to prosthetic treatment. The abutment teeth were prepared with a 0.8- to 1-mm-wide circumferential chamfer, an axial reduction of 1 mm and an occlusal reduction of 1- to 2.0-mm. A 10- to 15- degree angle of convergence was achieved for the axial walls. Tooth preparations were scanned with an intraoral scanner and the crowns were designed using specific software. The restorations were then cemented using a resin self-adhesive cement. After cementation, occlusal contacts were evaluated, and the adjusted surfaces were polished using a porcelain polishing kit. The 70 crowns were examined at 1week (baseline),1, 2 and 3 years by 2 researchers who were not involved in the restorative treatment.
Recruitment & Eligibility
- Status
- ACTIVE_NOT_RECRUITING
- Sex
- All
- Target Recruitment
- 70
- One posterior tooth (molar or premolar) to be crowned
- Vital abutment or abutment with an adequate endodontic treatment
- Abutment not crowned previously
- Periodontally healthy abutment with no signs of bone resorption or periapical disease.
- Adequate occlusogingival height ≥ 4 mm.
- Stable occlusion and the presence of natural antagonist tooth.
- Patients who present reduced crown length (less than 4 mm occlusogingival height).
- Poor oral hygiene, high caries activity, or active periodontal disease
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Metal-ceramic Metal-ceramic To assess the clinical performance and survival of posterior metal-ceramic crowns Monolithic zirconia Monolithic zirconia To assess the clinical performance and survival of posterior monolithic zirconia crowns
- Primary Outcome Measures
Name Time Method Margin stability at 1 year 1 year To assess the gingival margin stability throughout the evaluation period (subgingival, isogingival or supragingival)
Quality of restorations at 1 year 1 year The quality of the surface and color, anatomical form and marginal integrity was assessed using the California Dental Association's (CDA) assessment system. Each CDA criterion was ranked on a scale of 1 to 4, where 4 = excellent, 3 = good, 2 = unacceptable (repair), and 1 = unacceptable (replacement).
Quality of restorations at 2 years 2 years The quality of the surface and color, anatomical form and marginal integrity was assessed using the California Dental Association's (CDA) assessment system. Each CDA criterion was ranked on a scale of 1 to 4, where 4 = excellent, 3 = good, 2 = unacceptable (repair), and 1 = unacceptable (replacement).
Plaque Index (PI) at 1 year 1 year Plaque Index (PI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Patient satisfaction at 3 years 3 years Subjective patient satisfaction using Visual analogue scale (VAS) ranged from 0 (worst possible result) to10 (best possible result). The items analyzed were: esthetics, function, comfort, overall satisfaction
Gingival Index (GI) at 1 year 1 year Gingival Index (GI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Margin stability at baseline Baseline To assess the gingival margin stability throughout the evaluation period (subgingival, isogingival or supragingival)
Quality of restorations at baseline Baseline The quality of the surface and color, anatomical form and marginal integrity was assessed using the California Dental Association's (CDA) assessment system. Each CDA criterion was ranked on a scale of 1 to 4, where 4 = excellent, 3 = good, 2 = unacceptable (repair), and 1 = unacceptable (replacement).
Probing depth at 1 year 1 year Probing depth of the abutment and control teeth. A score of 0 to 4 was assigned. Higher score means a worse outcome
Margin stability at 2 years 2 years To assess the gingival margin stability throughout the evaluation period (subgingival, isogingival or supragingival)
Quality of restorations at 3 years 3 years The quality of the surface and color, anatomical form and marginal integrity was assessed using the California Dental Association's (CDA) assessment system. Each CDA criterion was ranked on a scale of 1 to 4, where 4 = excellent, 3 = good, 2 = unacceptable (repair), and 1 = unacceptable (replacement).
Plaque Index (PI) at 2 years 2 years Plaque Index (PI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Plaque Index (PI) at 3 years 3 years Plaque Index (PI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Gingival Index (GI) at baseline Baseline Gingival Index (GI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Gingival Index (GI) at 2 years 2 years Gingival Index (GI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Probing depth at baseline Baseline Probing depth of the abutment and control teeth. A score of 0 to 4 was assigned. Higher score means a worse outcome
Plaque Index (PI) at baseline baseline Plaque Index (PI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Gingival Index (GI) at 3 years 3 years Gingival Index (GI) of the abutment and control teeth. A score of 0 to 3 was assigned. Higher score means a worse outcome.
Probing depth at 2 years 2 years Probing depth of the abutment and control teeth. A score of 0 to 4 was assigned. Higher score means a worse outcome
Margin stability at 3 years 3 years To assess the gingival margin stability throughout the evaluation period (subgingival, isogingival or supragingival)
Probing depth at 3 years 3 years Probing depth of the abutment and control teeth. A score of 0 to 4 was assigned. Higher score means a worse outcome
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (1)
Faculty of Odontology
🇪🇸Madrid, Spain