14y Prospective Study on Posterior Zirconia-based 3-unit FDPs

Federico II University37 enrolled

Overview

The main objective of the present prospective study is to evaluate the effectiveness of posterior zirconia FDPs after 14 years of function.

thirty-seven patients needing to replace either premolars or molars were involved and 48 3-unit zirconia-based FDPs were fabricated. Patients included in the present clinical study met specific inclusion criteria and clinical procedures were standardized. Frameworks with a 9 mm2 cross section of the connectors and 0.6 mm minimum thickness of the retainers were made by means of Computer Aided Design/Computer Assisted Manufacturing. A resin cement was used to lute the restorations. The patients were recalled after 6 and 12 months and then yearly up to a total follow-up of 14 years. The United States Public Health Service criteria were used in order to examine technical and esthetic outcomes. Success and survival rates

Study Type

OBSERVATIONAL

Enrollment

Conditions

Prosthesis Survival

Interventions

2 zirconia FDPsOTHER

The United States Public Health Service criteria were used in order to examine technical and esthetic outcomes. Success and survival rates of the zirconia FDPs were calculated. The biological examination was performed analyzing both abutments and contralateral teeth.

1 zirconia FDPOTHER

Eligibility

Sex: ALLMin age: 21 YearsMax age: 68 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * good general health; * ASA I or ASA II according to the American Society of Anesthesiologists; * good periodontal health; * Angle class I occlusal relationship; * minimum of 20 teeth; * good oral hygiene; * no evident signs of occlusal parafunctions and/or temporo-mandibular disorders. Moreover, the abutment teeth had to fulfill the following inclusion criteria: * periodontal health (absence of tooth mobility, absence of furcation involvement); * proper positioning in the dental arch (tooth axes adequate for a FDP); * sufficient occlusal-cervical height of the clinical crown (≥4 mm) for the retention of a FDP; * vital or endodontically treated to a clinically sound state; * opposing natural teeth or fixed prostheses. Exclusion Criteria:- subjects preferring implant-supported prostheses; * high caries activity; * occlusal-gingival height of the abutment teeth \<4 mm; * reduced interocclusal distance or supraerupted opposing teeth; * unfavorable crown-to-root ratio; * severe wear facets, clenching, bruxism; * presence of removable partial dentures; * pregnancy or lactation.

Outcomes

Primary Outcomes

Survival and success rate of zirconia FDPs

The 14-year cumulative survival rate of the zirconia FDPs was calculated by means of Kaplan-Meier analysis.

Time frame: 14 years

Secondary Outcomes

Technical and aesthetic outcomes

The United States Public Health Service criteria were used in order to examine technical and esthetic outcomes.

Time frame: 14 years

Data from ClinicalTrials.gov

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