Pérez‐Sayans M, Castelo‐Baz P, Penarrocha‐Oltra D, Seijas‐Naya F, Conde‐Amboage M, Somoza‐Martín JM. Impact of abutment geometry on early implant marginal bone loss. A double-blind, randomized, 6-month clinical trial.
Clin Oral Implants Res 2022;
33:1038-1048. [PMID:
35869615 PMCID:
PMC9796139 DOI:
10.1111/clr.13985]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 06/09/2022] [Accepted: 06/22/2022] [Indexed: 01/01/2023]
Abstract
OBJECTIVES
The objective of this study was to analyze the impact of the abutment width on early marginal bone loss (MBL).
MATERIAL AND METHODS
A balanced, randomized, double-blind clinical trial with two parallel experimental arms was conducted without a control group. The arms were "cylindrical" abutment and "concave" abutment. Eighty hexagonal internal connection implants, each with a diameter of 4 × 10 mm, were placed in healed mature bone. The main variable was the peri-implant tissue stability, which was measured as MBL at 8 weeks and 6 months.
RESULTS
The final sample consisted of 77 implants that were placed in 25 patients. 38 (49.4%) were placed using the cylindrical abutment, and the other 39 (50.6%) were placed using the concave abutment. The early global MBL of -0.6 ± 0.7 mm in the cylindrical abutment group was significantly higher than it was in the concave abutment group, in which the early global MBL was -0.4 ± 0.6 mm (p = .030). The estimated effect size (ES) was negative for the cylindrical abutment (ES = -1.3730, CI -2.5919 to -0.1327; t-value = -2.4893; p = .0139), therefore implying a loss of mean bone level, and it was positive for the concave abutment (ES = 2.8231; CI: 1.4379 to 4.2083; t-value = 4.0957; p = .0002), therefore implying an increase in the average bone level.
CONCLUSIONS
The concave abutments presented significantly less early MBL at 6 months post-loading than classical cylindrical abutments did.
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