The Clinical Study Of The Socket-shield Technology

Objective:Implants immediately after tooth extraction are usually accomp-anied by absorption of surrounding tissues.To reduce the tissue absorption,a new technology has been proposed.The periodontal ligament and the buccal wall of the root are preserved by retaining the part of the buccal root tissue and implant theimplant with or near the retained root tissue when the tooth is removed.Animal studies indicate that this technology has the potential to maintain buccal soft and hard tissue stability at implant sites.The main purpose of this study is to further understand the biological safety of this technique by observing the clinical manifestations of the tissue around the implant and the postoperative complications.Another objective is to evaluate the ability of this technique to maintain the soft and hard tissue volume at the implant site by measuring the changes in the soft and hard tissue at the implant site and the aesthetic effect.Materials:and methods:This study is a retrospective case study of 8 implant cases located between bilateral maxillary second premolars.CBCT was taken before operation,after the crown restoration and revisit 3 months later.Periodontal probing depth(PD),bleeding on probing(BOP)and keratinized gingival width at the top of buccal gingival were measured using a periodontal probe.The clinical pictures of the patients before operation,after the crown restoration and reviewed after 3 months were collected.The acquired radiological data and clinical data were analyzed to assess the changes in the tissue morphology around the implants and the complications of implantation.Result:No adverse reaction occurred in all cases.The depth of the soft tissue around the implant was used to reflect the health status of the surrounding tissues.By analyzing the CBCT images,we compared the height of alveolar ridge at the neck of the implant to reflect the physiological bone remodeling around the implant.The probing depth of the soft tissue around the implant,the bleeding on probing and the color,shape,texture of the surrounding soft tissue were normal.There were enough keratinized gingival width at the site of implantation in all patients,with an average width of 3-5 mm.The average retraction of the gingival apex on the buccal side of the implant site was-0.2±0.13 mm,the average change of the gingival vertex of the implant site in the distal teeth was 0.19±0.17 mm,and the average change of the gingival vertex of the proximal teeth at the planting site was-0.24±0.1 mm.The average tissue changes of buccal and lingual tissues were-0.32±0.22 mm.The average height of the proximal alveolar ridge was reduced by 0.31±0.29 mm,and the height of the distal alveolar ridge decreased by 0.31±0.37 mm.All the cases were scored by the pink esthetics score,and the results were all positive,with an average score of 12.Conclusion:Analysis of the research object,after use of the socket-shield technique,there was only a slight change in the volume of alveolar bone during tooth extraction and the volume of alveolar bone during revisit.The shrinkage rate of gingival tissue is basically the same as that of the adjacent teeth.Although the review of this retrospective case study is limited,this study shows that the application of root tissue barrier technique to oral implant surgery reduces surgical trauma and effectively preserves the contour of the soft and hard tissue on the cheek of the implant site and improves the aesthetic effect.But before obtaining a higher level of prospective clinical trial evidence,this technique is not recommended for routine clinical implant surgery.