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. 2022 Apr 4;11(7):2014.
doi: 10.3390/jcm11072014.

Marginal Bone Maintenance and Different Prosthetic Emergence Angles: A 3-Year Retrospective Study

Diego Lops  1 , Eugenio Romeo  1 , Michele Stocchero  2 , Antonino Palazzolo  1 , Barbara Manfredi  1 , Luca Sbricoli  2
Affiliations

Marginal Bone Maintenance and Different Prosthetic Emergence Angles: A 3-Year Retrospective Study

Diego Lops et al. J Clin Med. .

Abstract

The aim of the present retrospective study was to assess marginal bone changes around implants restored with different prosthetic emergence profile angles. Patients were treated with implants supporting fixed dentures and were followed for 3 years. Marginal bone levels (MBL) measured at the prosthesis installation (t0) and at the 3-year follow-up visit (t1) were considered. The MBL change from t0 to t1 was investigated. Two groups were considered: Group 1 for restorations with an angle between implant axis and prosthetic emergence profile >30°, and Group 2 for those with an angle ≤30°, respectively. Moreover, peri-implant soft tissue parameters, such as the modified bleeding index (MBI) and plaque index (PI) were assessed. Seventy-four patients were included in the analysis and a total of 312 implants were examined. The mean EA in groups 1 and 2 was 45 ± 4 and 22 ± 7 degrees, respectively. The mean marginal bone level change (MBL change) of 0.06 ± 0.09 mm and 0.06 ± 0.10 mm were, respectively, in groups 1 and 2. The difference in the MBL change between the two groups was not statistically significant (p = 0.969). The MBL change does not seem to be influenced by the emergence angle for implants with a stable internal conical connection and platform-switching of the abutment diameter.

Keywords: bone level; dental implant; emergence profile; prospective study; sub-crestal placement.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Emergence angle (EA) definition. White line: parallel to implant long axis. Red line: parallel to the white and tangential to the restoration from the implant to abutment connection. Green line: from implant to abutment connection point to the emergence profile. The angle of the intersection (yellow line) resulted in the emergence angle (EA).
Figure 2
Figure 2
Bone levels at time of implant surgery, at prosthesis installation (baseline) and at last follow-up visit. Green line: implant axis. Blue line: prosthetic emergence profile axis. Orange line: angle between implant axis and prosthetic emergence profile >30°, determining the allocation in Group 1.
Figure 3
Figure 3
Bone levels at time of implant surgery, at prosthesis installation (baseline) and at last follow-up visit. Green line: implant axis. Blue line: prosthetic emergence profile axis. Orange line: angle between implant axis and prosthetic emergence profile ≤30°, determining the allocation in Group 2.
See this image and copyright information in PMC

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