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Vertical Versus Horizontal Finishing Lines for Dental Preparations: A Systematic Review With Meta-Analysis
Monica Bonfanti-Gris1, Guillermo Pradies1, Belen Moron-Conejo1
1Analysis of Techniques, Material and Instruments Applied to Digital Dentistry and CAD/CAM Procedures Research Group, University Complutense of Madrid, Madrid, Spain.
Summary
Horizontal and vertical dental preparation techniques show similar survival and success rates for fixed restorations. Clinician preference and specific clinical situations should guide technique selection, as no significant outcome differences were found.
Area of Science:
- Restorative Dentistry
- Dental Materials Science
- Periodontology
Background:
- Dental preparation techniques are crucial for the longevity of tooth-supported fixed restorations.
- Horizontal and vertical preparation designs are commonly employed, but their comparative efficacy requires further elucidation.
Purpose of the Study:
- To evaluate the influence of horizontal versus vertical dental preparation techniques on tooth-supported fixed restorations.
- To compare survival rates, success rates, periodontal variables, and patient-reported outcomes (PROs) between these techniques.
Main Methods:
- A systematic literature search was conducted up to January 2024, including RCTs/CCTs, cohort studies, and case series with ≥3 years follow-up.
- Nineteen studies were included in a meta-analysis comparing preparation techniques based on survival and success rates, with secondary analysis of periodontal variables.
Main Results:
- No significant differences in survival rates (RR 0.96-1.04, p=0.95) or success rates (RR 0.93-1.14, p=0.53) were observed between horizontal and vertical preparation techniques.
- Periodontal variables also showed varied results, indicating no clear advantage for either technique.
Conclusions:
- Both horizontal and vertical preparation techniques demonstrate comparable survival and success rates for dental restorations.
- The selection between horizontal and vertical preparation techniques can be based on clinician preference and specific clinical circumstances due to the lack of significant outcome differences.
