AbstractObjectivesThe aim of this study was to investigate the association of the Mucosal Emergence Angle (MEA) with peri‐implant tissue mucositis.Material and MethodsForty‐seven patients with 103 posterior bone level implants underwent clinical and radiographic examination. Three‐dimensional data from Cone Bean Computer Tomography and Optica Scan were transposed. Three angles were defined: MEA, Deep Angle (DA) and Total Angle (TA) and measured at six sites for each implant.ResultsThere was a significant correlation between MEA and Bleeding on Probing for all sites with an overall odds ratio of odd ratio 1.07 (95% confidence interval [CI] 1.05–1.09,p< 0.001). Sites with MEA ≥ 30°, 40°, 50°, 60°, and 70° had a higher risk for bleeding with an odds ratio of 3.1, 5, 7.5, 11.4 and 33.55, respectively. When all 6 sites of an implant prostheses had MEA ≥ 40°, the risk of having bleeding at all 6 sites was 9.5 times higher (95% CI 1.70–52.97,p= 0.010).ConclusionsMaintaining MEA no wider than 30°−40° is advisable, while the aim should be to keep this angle as narrow as clinically feasible. Registered in Thai Clinical Trials Registry:http://www.thaiclinicaltrials.org/show/TCTR20220204002.