J Korean Acad Prosthodont.  2012 Jan;50(1):21-28.

Effects of implant collar design on marginal bone and soft tissue

• Yoo HS
• Kang SN
• Jeong CM
• Yun MJ
• Huh JB
• Jeon YC

Abstract

PURPOSE
The purpose of this study was to investigate the effects of implant collar design on marginal bone change and soft tissue response by an animal test
MATERIALS AND METHODS
Two types of Implant (Neobiotech Co. Seoul, Korea) that only differs in collar design were planted on two healthy Beagle dogs. The implants were divided into two groups, the first group with a beveled collar (Bevel Group) and the second group with "S" shaped collar (Bioseal group). Standardized intraoral radiographs were used to investigate the mesio-distal change of the marginal bone. Histological analysis was done to evaluate the bucco-lingual marginal bone resorption and the soft tissue response adjacent to the implant. Mann-Whitney test was done to compare the mesio-distal marginal bone change at equivalent time for taking the radiographs and the tissue measurements between the groups.
RESULTS
Radiographic and histological analysis showed that there was no difference in marginal bone change between the two groups (P>.05). Histological analysis showed Bioseal group had more rigid connective tissue attachment than the Bevel group. There was no difference in biological width (P>.05). Bevel group showed significantly longer junctional epithelium attachment and Bioseal group showed longer connective tissue attachment (P<.05).
CONCLUSION
For three months there were no differences in marginal bone change between the Bevel group and the Bioseal group. As for the soft tissue adjacent to the implant, Bioseal group showed longer connective tissue attachment while showing shorter junctional epithelium attachment. There were no differences in biologic width.

Keyword

Collar design; Marginal bone resorption; Biologic width; Cnnective tissue attachment; Junctional epithelium attachment; Bioseal

MeSH Terms

Animals
Bone Resorption
Connective Tissue
Dogs
Epithelial Attachment
Plants
Root Canal Filling Materials
Root Canal Filling Materials

Figure

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  Fig. 1 Design of implant fixtures used in this study: A, Bevel group; B, Bioseal group.

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  Fig. 2 Surgical procedures. A: Flattening edentulous ridge, B: Drilling, C: After fixation.

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  Fig. 3 Gray scale color coding for radiographic analysis.

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  Fig. 4 Histometric measurement. PM, marginal portion of mucosa; aS, apical extension of sulcus; aJE, apical portion of junctional epithelium, fBIC, first bone-implant contact; JE, length of junctional epithelium (aS/aJE); CT, length of connective tissue (aJE/fBIC); BW, biologic width (PM/fBIC).

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  Fig. 5 Radiographic analysis on Bevel group. The white arrows indicate mesiodistal marginal bone level.

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  Fig. 6 Radiographic analysis on Bioseal group. The white arrows indicate mesiodistal marginal bone level.

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  Fig. 7 Histological analysis of two groups. A: Bevel group. Hematoxylin & eosin staining, B: Detail of (A), C: Bioseal group. Hematoxilin & eosin staining, D: Detail of (C). The connective tissue of Bioseal group was more firm and dense. In addition, Bioseal group had more connective volume.

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  Fig. 8 Soft tissue detachment observed in Bevel group only. In Bioseal group, all specimens had tight soft tissue attachment.

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