Universität zu Köln

Cohen, Omer, Ormianer, Zeev, Tal, Haim, Rothamel, Daniel, Weinreb, Miron and Moses, Ofer (2016). Differences in crestal bone-to-implant contact following an under-drilling compared to an over-drilling protocol. A study in the rabbit tibia. Clin. Oral Investig., 20 (9). S. 2475 - 2481. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1436-3771

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Abstract

The objective of this study is to compare bone-to-implant contact (BIC) between implants inserted at high torque due to under-drilling of the crestal bone to those inserted at low torque due to over-drilling of the crestal bone. Forty implants with diameters of 3.75 mm (group A) or 3.55 mm (group B) were inserted in the proximal tibiae of NZW rabbits in two separate surgeries on day 0 or 21. Osteotomy of the crestal bone was finalized with a 3.65-mm drill. In group A, implants were inserted at torque ae<yen>35 Ncm (under-drilling) and in group B with torque < 10 Ncm (over-drilling). Implants and their surrounding bone were retrieved on day 42, thus creating 3- and 6-week observation periods, processed for non-decalcified histology and stained with toluidine blue. Crestal BIC (c-BIC) and total BIC (t-BIC) were measured. Wilcoxon test was used to evaluate differences between groups. Three weeks post-surgery, the mean c-BIC in group A was 16.3 +/- 3.3 vs 31.5 +/- 3.4 % in group B (P < 0.05). At 6 weeks, a similar trend was observed (group A: 28.7 +/- 3.6 %; group B: 38.4 +/- 4.9 %) (P > 0.05). No differences in t-BIC were noted at 3 weeks and at 6 weeks between the groups. Insertion of implants with an over-drilling protocol of the crestal aspect of the osteotomy resulted in increased short-term crestal bone-to-implant contact. Insertion of implants with a high torque following an under-drilling protocol, commonly used for immediate loading, may reduce crestal bone-to-implant contact at early healing stages.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Cohen, Omer UNSPECIFIED UNSPECIFIED UNSPECIFIED Ormianer, Zeev UNSPECIFIED UNSPECIFIED UNSPECIFIED Tal, Haim UNSPECIFIED UNSPECIFIED UNSPECIFIED Rothamel, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Weinreb, Miron UNSPECIFIED UNSPECIFIED UNSPECIFIED Moses, Ofer UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-254261
DOI:	10.1007/s00784-016-1765-8
Journal or Publication Title:	Clin. Oral Investig.
Volume:	20
Number:	9
Page Range:	S. 2475 - 2481
Date:	2016
Publisher:	SPRINGER HEIDELBERG
Place of Publication:	HEIDELBERG
ISSN:	1436-3771
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OSTEOBLAST GENE-EXPRESSION; INSERTION TORQUE; FORMATION ADJACENT; STABILITY; DENSITY; MICROMOTION; DOGS Multiple languages Dentistry, Oral Surgery & Medicine Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25426