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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 23 (2008), No. 3     15. May 2008
Int J Oral Maxillofac Implants 23 (2008), No. 3  (15.05.2008)

Page 544-550, PubMed:18700381

"Biologic Width" and Crestal Bone Remodeling with Sintered Porous-Surfaced Dental Implants: A Study in Dogs
Deporter, Douglas A. / Al-Sayyed, Arwa / Pilliar, Robert M. / Valiquette, Nancy
Purpose: The aim of this study was to obtain histometric measurements of bone and peri-implant mucosal tissue contact with implants of 2 sintered porous-surfaced designs. The "short-collar" design had a collar height (smooth coronal region) of 0.75 mm, while the "long-collar" model had a smooth coronal region of 1.8 mm.
Materials and Methods: Implants (2 per side) were placed in healed mandibular extraction sites of 4 beagle dogs using a submerged technique. After 4 weeks of healing, they were uncovered and used to support fixed partial dentures for a 9-month period. After sacrifice, specimens were retrieved and nondemineralized sections were examined histometrically to determine the most coronal bone-to-implant contact (first BIC) using the microgap as a reference and standard mucosal parameters of "biologic width".
Results: Significant (P = .001) differences in first BIC were found between designs (1.97 mm for long-collar versus 1.16 mm for short-collar implants) for posteriorly located implants but not for anteriorly located ones (1.21 mm versus 1.38 mm; P = .40). If crestal bone loss involved sintered surface, fibrous connective tissue ingrowth was observed to replace lost bone. No significant differences in peri-implant mucosal measurements (total peri-implant mucosal thickness; length of the epithelial component of this mucosa, and thickness of the connective tissue component) were detected between implant designs.
Conclusions: Results suggest that "biologic width" accommodation drives initial crestal bone loss with sintered porous-surfaced implants. Histometric data obtained for bone contact showed no significant differences between the long- and short-collar implant designs.

Keywords: biologic width, bone remodeling, collar height, sintered porous-surfaced dental implants