Abstract

PURPOSE
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).
RESULTS
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).
CONCLUSIONS
No differences were found between 1-stage and 2-stage implant placement in crestal bone loss after 1 year of functional loading.

Links

Publisher Full Text

Authors

Siadat H, Panjnoosh M, Alikhasi M, Alihoseini M, Bassir SH, Rokn AR

Institution

Implant Research Center and Department of Prosthodontics, Tehran University of Medical Sciences School of Dentistry, Tehran, Iran.

Source

Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons 70:2 2012 Feb pg 307-13

MeSH

Adult
Aged
Alveolar Bone Loss
Alveolar Process
Dental Implant-Abutment Design
Dental Implantation, Endosseous
Dental Prosthesis Design
Dental Prosthesis, Implant-Supported
Denture, Partial, Fixed
Female
Follow-Up Studies
Humans
Immediate Dental Implant Loading
Jaw, Edentulous, Partially
Male
Mandible
Middle Aged
Radiography, Dental, Digital
Subtraction Technique
Surgical Flaps
Treatment Outcome
Young Adult

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22169672