〔Abstract〕 To investigate the relationship between the transgingival characteristics of implant restora- tions and peri-implant soft tissue with peri-implant mucositis and peri-implantitis using three-dimensional measure- ment techniques . Methods A total of 121 bone-level implant restorations in posterior tooth positions from 73 pa- tients were evaluated using three-dimensional data analysis software , based on clinical and radiographic examination data. The following characteristics were assessed : emergence angles , including the mucosal emergence angle (MEA) , deep angle (DA) , and total angle (TA) ; emergence profile; and peri-implant soft tissue . Generalized estimating equations were used to analyze the relationship between these characteristics and the occurrence of peri - implant mucositis and peri-implantitis . Results TA and MEA showed significant statistical relevance to peri-im- plant mucositis . Implant restorations with a TA greater than 30 °had a 1 . 7 times higher risk of developing peri-im- plantitis compared to those with a TA of less than 30 °. Conclusion MEA and TA of bone-level implant restora- tions in posterior tooth positions are significantly correlated with peri-implant mucositis . An excessive TA increases the likelihood of peri-implantitis . It is recommended that both the coronal and overall emergence angles of implant restorations should not exceed 30 °.