Influence of emergence profile designs on the peri-implant tissue in the mandibular molar:A randomized controlled trial
10.19723/j.issn.1671-167X.2025.01.010
- VernacularTitle:下颌磨牙穿龈形态设计对种植体周围软组织影响的随机对照临床研究
- Author:
Juan WANG
1
;
Lixin QIU
1
;
Huajie YU
1
Author Information
1. 北京大学口腔医学院·口腔医院第四门诊部,国家口腔医学中心,国家口腔疾病临床医学研究中心,口腔生物材料和数字诊疗装备国家工程研究中心,口腔数字医学北京市重点实验室,北京 100081
- Publication Type:Journal Article
- Keywords:
Emergence profile;
Dental implants,single-tooth;
Gingival recession;
Mouth mucosa
- From:
Journal of Peking University(Health Sciences)
2025;57(1):65-72
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the influence of different emergence profile of implants in mandibu-lar molar on the peri-implant soft tissue.Methods:Forty-four implants were divided into two equal groups by mucosal thickness,≥2 mm(group A)or＜2 mm(group B),and were randomly included in the test group and the control group.In the control group,the patients were treated by a prosthesis with no transmucosal modifications(subgroups A1 and B1).In groups A1 and B1,the prostheses maintained the original emergence profile of the healing abutment.In the test group,the prostheses were designed based on a width-to-height ratio(W/H)of 1.3:1(subgroups A2 and B2).In group A2,the buccal transmucosal configuration design was slightly concave,and in group B2,the prostheses were designed with convex buccal transmucosal configuration.Assessments were made before delivery of the definitive restoration(T0),one month(T1)and 12 months(T2)after loading.The soft tissue and prosthesis in-formation were obtained by intraoral scan and were converted to digital models.The digital models of dif-ferent time were superimposed together.Buccal mucosal W/H,emergence angle(EA)and buccal muco-sal margin recession(ΔGM)were measured.Results:One year after loading,the buccal mucosal mar-gin recession in the test group(groups A2 and B2)was significantly lower than that in the control group(groups A1 and B1).The ΔGM in group A2 was significantly lower than that in group A1(P=0.033),but in groups B1 and B2,it was not significantly different.The W/H in group A2 increased significantly one month after loading,but remained stable at one year.In the A1 group,the W/H changed little from initial to one month,but increased significantly at one year after loading.The W/H in group B2 remained stable from the beginning to one year,while in group B1,it changed little one month after loading,but increased significantly by one year.Conclusion:When the initial mucosal thickness was ≥2 mm,the slightly concave prosthesis designed based on the biological W/H significantly maintained the level of buccal mucosa.When the mucosal thickness was＜2 mm,the slightly convex prosthesis design main-tained a more stable W/H over one year.
