Radiographic evaluation of immediately loaded implants supporting 2-3 units fixed bridges in the posterior maxilla: a 3-year follow-up prospective randomized controlled multicenter clinical study

Gianfranco Cesaretti; Daniele Botticelli; Antonio Renzi; Marcello Rossi; Riccardo Rossi; Niklaus P Lang

doi:10.1111/clr.12565

Radiographic evaluation of immediately loaded implants supporting 2-3 units fixed bridges in the posterior maxilla: a 3-year follow-up prospective randomized controlled multicenter clinical study

Clin Oral Implants Res. 2016 Apr;27(4):399-405. doi: 10.1111/clr.12565. Epub 2015 Feb 9.

Authors

Gianfranco Cesaretti¹, Daniele Botticelli^{1

2}, Antonio Renzi², Marcello Rossi³, Riccardo Rossi³, Niklaus P Lang^{4

5}

Affiliations

¹ Faculty of Dentistry, University of Medical Science, La Habana, Cuba.
² ARDEC, Ariminum Odontologica, Rimini, Italy.
³ Private Practice, Rome, Italy.
⁴ Center for Dental Medicine, University of Zurich, Zurich, Switzerland.
⁵ University of Bern, Bern, Switzerland.

PMID: 25664701
DOI: 10.1111/clr.12565

Abstract

Objective: To compare the survival rate and alveolar bone levels at implants installed in healed sites and functionally loaded within 1 h from installation or after 3 months.

Material and methods: A total of 30 patients (17 male and 13 female) were recruited and 71 implants with a SLA(®) surface, 4.1 mm in diameter and 8-12 mm long, were installed in a fully healed alveolar ridge, 36 as test and 35 as control implants. The test implants were immediately loaded with a temporary reconstruction in proper occlusion, while the randomly selected control sites received the final reconstruction after 3 months. Radiographic bone levels were determined after implant installation, prosthesis delivery, and at annual intervals thereafter.

Results: One patient of the control and one patient of the test were excluded from evaluation. No further losses of implants or patients were seen up to the 3-year follow-up. Hence, data from 28 patients were accounted for. A total of 37 and 36 metal-ceramic crowns were provided at the test and control sites, respectively. No biological and technical complications were observed during the 3-year follow-up. Bone levels at the time of implant installation were at 1.6 ± 0.8 and 1.7 ± 0.9 mm from the implant shoulder at the test and control sites, respectively. At prosthesis delivery, the bone levels were located at 2.4 ± 0.7 mm at the control sites 3 months after implant placement. After 1 year of function, similar bone levels were observed at both sites, displaying 2.4 ± 1.0 and 2.5 ± 0.8 mm at the test and control sites, respectively. No differences were found in the subsequent observation periods.

Conclusion: Survival rates and radiographic bone levels after 1, 2, and 3 years of observation did not differ between conventionally installed implants loaded immediately or delayed (after 3 months). Moreover, insertion torque values did not affect osseointegration.

Keywords: SLA surface; dental implants; immediate loading; prospective randomized study.

Publication types

Multicenter Study
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

MeSH terms

Alveolar Bone Loss / diagnostic imaging*
Alveolar Bone Loss / etiology
Dental Implantation, Endosseous* / adverse effects
Dental Prosthesis, Implant-Supported* / adverse effects
Denture, Partial, Fixed* / adverse effects
Female
Follow-Up Studies
Humans
Immediate Dental Implant Loading*
Male
Maxilla / diagnostic imaging
Maxilla / surgery
Prospective Studies
Tooth Socket / diagnostic imaging
Tooth Socket / surgery