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Prosthesis Emergence Angle Influences Marginal Bone Level on External Connection Implants: A Cross-Sectional Study

Graziano Montaruli/Alberto Dedola/Diana Russo/Khrystyna Zhurakivska/Luigi Laino/Filiberto Mastrangelo/Giuseppe Troiano, DDS, PhD

DOI: 10.11607/prd.6226

Purpose: The purpose of this study is to retrospectively evaluate the influence of prosthetic features on marginal bone level changes around bone-level implants with external hex connection. Materials and Methods: 100 patients with 166 implants and cemented crowns were included. Demographic and clinical data were collected. Prosthetic features, among which Emergence Angle (EA), Emergence Profile (EP), Crown-Implant Ratio (CIR) and abutment height were radiographically evaluated. Marginal bone levels were measured on intraoral radiographs taken at baseline and after at least 1 year follow-up. Correlation between prosthetic features and marginal bone loss (MBL) was then investigated. Results: The mean follow-up was of 43.94 months. Implants length varied between 5 and 13mm. The mean height of the used abutments was of 1.55 mm. EA measured in average 30.62° (±13.20) mesially and 29.45° (±13.07) distally. The CIR was 0.99 (±0.26). The mean MBL was of 0,19mm on mesial side and 0,20 mm on distal side of the implants. Significant positive associations emerged between MBL and implant length (p<0.005), as well as with EA (p<0.05). A convex profile of the crown resulted to be associated with a higher distal MBL (p=0.025), compared to concave and straight profiles. Int J Periodontics Restorative Dent. doi: 10.11607/prd.6226

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