The Influence of Different Materials and Locations of Crown Margin on Periodontal Tissue of Human

Objective To evaluate the influences of different materials and locations of crown margin on periodontal tissue of human. Methods Twenty patients requiring 30 artificial crowns were selected for this study. Gingival cervical fluid (GCF) volume, in-vitro activity of aspartate aminotransferase (AST) in GCF, probing depth (PD), as well as the frequency of either sulcus bleeding index (SBI)≥2 or plaque index (PLI)≥1 cases in 20 patients has been examined, immediately before preparation and 7-8 weeks after cementation of crowns. The marginal openings of crowns were measured before and after the cementation. The oral health education was given after the cementation of temporary crowns and durable crowns. Results No significant difference of GCF volume, GCF-AST and the frequency of SBI≥2 was observed before and 7-8 weeks after cementation of crowns, although the frequency of PLI≥1 decreased significantly after cementation. Conclusion The data indicated that different materials and locations of crown margin exhibited no unfavorable influence on periodontal tissue of human, providing that appropriate oral health education was applied.