The Effect of Different Finish Line Designs and Material Types on the Periodontal Response of Single Crown Restoration: A 3-year Follow-up Study

Abstract

Purpose: Different restorative materials and marginal finish lines may contribute to periodontal inflammation, in spite of patients' proper oral hygiene habits. The aim of this study was to evaluate the effect of different finish line designs and restorative materials on periodontal health. Materials and Methods: In this retrospective clinical study, the periodontal clinical parameters of 450 crown restorations fabricated with different finish line designs (chamfer, shoulder, knife-edge) and different materials (Metal-ceramic, Zirconia, Glass-ceramic) were evaluated at baseline and at 12th, 24th and 36th months after the cementation. The data were analyzed with Repeated Measures ANOVA and post hoc least significant difference tests were performed (α=.05). Results: Periodontal clinical parameters significantly increased during the 36-month follow-up period. The marginal finish line and material type had no significant effect on the probing depth and gingival index scores. The highest plaque index scores were observed in zirconia restorations with knife edge finish lines at the 36th month after crown placement. Conclusions: The periodontal health of the prepared tooth was negatively affected by the increased follow-up duration regardless of the marginal finish line design and material type. The clinicians should consider the favorable effect of the glass-ceramic crown restorations with a chamfer finish line on the plaque control for long-term success.