Does implant staging choice affect crestal bone loss?
The purpose of the present study was to compare the crestal bone loss around implants placed according to either a 1-stage or 2-stage implant installation procedure using a digital subtraction radiography technique.
MATERIALS AND METHODS
In the present randomized clinical trial, screw-shaped tapered implants were inserted in the posterior mandible of patients needing fixed partial dentures. In each edentulous area, according to the randomization table, 1 implant was inserted using a 1-stage procedure (group 1) and 1 was placed using a 2-stage approach (group 2). The implants were temporized with the relined denture after 2 weeks. All implants were functionally loaded with fixed partial dentures after 3 months. Crestal bone loss (primary outcome variable) was measured using a digital subtraction radiography technique. Standardized radiovisiographs were taken after implant insertion, after fixed partial denture installation (3 months after surgery), and after 6 and 12 months of functional loading. The data were analyzed using the Wilcoxon signed ranks test (α = 0.05).
Eleven patients (mean age 46.9 years, 3 women and 8 men) were included in the study. A total of 34 implants were inserted, 17 using a 1-stage protocol and 17 using a 2-stage protocol. Three months after implant placement, the 2-stage implants showed significantly more crestal bone loss (0.65 ± 0.71 mm) than the 1-stage implants (0.41 ± 0.53 mm; P = .02). However, after 6 and 12 months of functional loading, both groups showed comparable changes in bone level (P > .05).
No differences were found between 1-stage and 2-stage implant placement in crestal bone loss after 1 year of functional loading.
Implant Research Center and Department of Prosthodontics, Tehran University of Medical Sciences School of Dentistry, Tehran, Iran.
SourceJournal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons 70:2 2012 Feb pg 307-13
Alveolar Bone Loss
Dental Implant-Abutment Design
Dental Implantation, Endosseous
Dental Prosthesis Design
Dental Prosthesis, Implant-Supported
Denture, Partial, Fixed
Immediate Dental Implant Loading
Jaw, Edentulous, Partially
Radiography, Dental, Digital
Pub Type(s)Comparative Study
Randomized Controlled Trial
Research Support, Non-U.S. Gov't