(Open access funding provided by Semmelweis University)
Szakterületek:
Fogászat, szájsebészet és -gyógyászat
Insufficient marginal and internal adaptation can lead to secondary caries, pulp infection,
periodontal disease, and tooth loss. This network meta-analysis (NMA) assessed the
impact of various finish line designs on the marginal and internal adaptation of ceramic
fixed dental prostheses.In vitro studies were conducted comparing the adaptation of
full-ceramic fixed dental prostheses with various preparation designs (chamfer, shoulder,
rounded shoulder, and vertical). An electronic search of four major databases (Cochrane
Library, EMBASE, PubMed, Web of Science) on April 1, 2025, identified 4,714 studies.
After screening, review authors found 50 studies eligible for qualitative analysis
and 34 for quantitative analysis. NMA and pairwise comparisons assessed marginal gap
(MG), internal gap (IG), and absolute marginal discrepancy (AMD). The subset analysis
considered the presence of cementation, manufacturing techniques, restoration types
and evaluation techniques. The QUIN tool evaluated the risk of bias, while GRADE PRO
and CINEMA assessed certainty of result.This NMA identified the chamfer preparation
as the most favorable for smaller internal gap, the vertical preparation as the most
effective for smaller marginal gap, and the rounded shoulder as the top performer
for smaller absolute marginal discrepancy (AMD). Although no statistically significant
differences in marginal fit (MG and AMD) were found among the tested designs (vertical,
chamfer, rounded shoulder, and shoulder), the significantly superior internal adaptation
(MD: 26.65 μm) associated with the chamfer finish line supports its recommendation
for clinical use.The findings suggest that although marginal fit differences (MG,
AMD) among finish line designs may not be statistically significant, the internal
adaptation advantage of the chamfer finish line supports its clinical recommendation.
The discrepancies observed between internal and marginal fit emphasize the critical
role of cement space optimization to achieve balanced adaptation, which is key to
enhancing the longevity and clinical success of ceramic restorations.
