Clinical research on the fitness of posterior implant-supported crown fabricated by digital impression techniques
Objective:To compare the fitness of posterior implant-supported crowns fabricated by two impression techniques using the silicone rubber replication method.Methods:One hundred and two patients with single posterior tooth loss treated at Hefei Stomatological Hospital were enrolled from October 2021 to December 2022,and randomly divided into control group and observational group after implant surgery.Traditional polyether silicone rubber impression and digital impression were used to fabricate screw-retained single implant crowns,respectively.The silicone rubber replication method was used to compare the marginal fit of the crowns in two groups.The clinical effectiveness of the two impression techniques in single implant crown restoration was analyzed by assessing the USPHS scores of the crowns,the duration of impression taking and adjustment,and patients'VAS scores.Results:The adhesive layer thickness at the buccal and lingual margins of the implant-supported single crowns in the observational group was significantly less than that in the control group(P<0.05).The USPHS scores for the crowns in both groups were similar,with no Grade C scores observed,and the difference was insignificant(P>0.05).The duration of impression taking and adjustment in the observational group was significantly lower than that in the control group(P<0.05).Patients'VAS scores for impression taking in the observational group were significantly higher than those in the control group(P<0.05).Conclusion:The fitness of implant-supported single crowns fabricated using both impression techniques meets clinical standards.Digital impression taking is worthy of wider clinical recommendation because it is faster and more comfortable for patients.
digital impressionmarginal fitsilicone rubber replication method