LOGIN
 
Share Page:
Back

Volume 21 , Issue 2
March/April 2006

Pages 212-224


Histomorphometric and Fluorescence Microscopic Evaluation of Interfacial Bone Healing Around 3 Different Dental Implants Before and After Radiation Therapy

Michael Weinlaender, MD, DDS / John Beumer III, DDS / E. Barrie Kenney, DDS / Vojislav Lekovic, DDS / Ralph Holmes, MD / Peter K. Moy, DDS / Hanns Plenk Jr, MD


PMID: 16634491

Purpose: Radiation therapy influence on bone healing around 3 types of endosseous dental implants in dogs was evaluated. materials and methods: Implants with 3 different surfaces (A = machined commercially pure titanium screws, B = commercially pure titanium plasma spray-coated cylinders, C = hydroxyapatite [HA] -ceramic coated cylinders) were first implanted unilaterally into the right posterior edentulous mandibles of 7 dogs as nonirradiated controls. After 12 weeks without functional loading and after sequential fluorochrome labeling these implants were retrieved by block dissection. In this same surgery, implants were placed on the contralateral side. Three weeks postimplantation the implant-containing hemimandibles were Cobalt 60 irradiated with the biologic equivalent of 5,000 cGy. Twelve weeks postimplantation and after labeling these irradiated implants were retrieved at sacrifice. On scanning electron, light, and fluorescence microscopic images of undecalcified longitudinal ground sections of the implants with surrounding tissues, percent bone-to-implant contact (% BIC), bone formation, and remodeling were histometrically and subjectively evaluated. Results: Woven bone formation started 1 week after implantation at the implant interfaces on both the nonirradiated and the irradiated sides. Average BICs (total/cortical/spongious bone bed) of 26%/49%/36% for surface A, 46%/48%/64% for surface B, and 81%/83%/78% for surface C were observed. In the irradiated hemimandibles average BICs (total/cortical/spongious bone bed) were reduced to 11%/9%/4% for surface A, 43%/46%/43% for surface B, and 63%/85%/76% for surface C, with increased resorption of peri-implant bone and retarded bone formation after irradiation. Discussion: Reductions of total % BIC in all irradiated implants, though not statistically significant, were significant (P .05) on implant surfaces A and B in the spongious bone bed. Conclusion: Retarded bone formation on surfaces A and B in the spongious bone bed represented a more radiation-sensitive situation at the time of radiation onset compared to advanced bone formation and maturation at surface C.

Int J Oral Maxillofac Implants 2006;21:212C224
Key words: bone-implant contact, histomorphometry, implant surfaces, radiation


Full Text PDF File | Order Article

 

 
Get Adobe Reader
Adobe Acrobat Reader is required to view PDF files. This is a free program available from the Adobe web site.
Follow the download directions on the Adobe web site to get your copy of Adobe Acrobat Reader.

 

© 2014 Quintessence Publishing Co, Inc JOMI Home
Current Issue
Ahead of Print
Archive
Author Guidelines
About
Accepted Manuscripts
Submission Form
Submit
Reprints
Permission
Advertising
Quintessence Home
Terms of Use
Privacy Policy
About Us
Contact Us
Help