Influence of Prosthetic Emergence Profiles and Emergence Angles on Marginal Bone Loss Around Implants With and Without Laser-Microgrooved Collar Surface: A Retrospective Study.

PURPOSE: To retrospectively evaluate differences in marginal bone loss (MBL) between bone level (BL) implants with laser-microgrooved collar surface (LMS) and without laser-microgrooved collar surface (noLMS), restored with screw-retained single crowns with different emergence profiles (EPs) and emergence angles (EAs).

MATERIALS AND

METHODS

A retrospective evaluation of records and radiographs of 90 patients scheduled for single-implant therapy at the molar region over a period of up to 10 years after prosthetic restoration was performed. The radiographic MBL and clinical parameters were measured over time and statistically analyzed.

RESULTS

LMS implants presented a statistically significant higher cumulative success rate (97.7% vs 91.1%; P < .05) and lower mean MBL (0.8 vs 1.7 mm; P < .05) compared to noLMS. Around noLMS BL implants, an EA ≤ 30 degrees (P < .05) and a concave EP (P < .05) showed a statistically significant correlation with reduced radiographic MBL. Around LMS BL implants, no statistically significant differences were found between different EAs or EPs.

CONCLUSIONS

Different EAs and EPs have not been found to influence MBL in BL LMS implants. noMLS implants restored with a narrow EA ≤ 30 degrees and a concave EP were associated with significantly less MBL over time.