J Korean Acad Prosthodont.  2008 Dec;46(6):602-609.

Marginal tissue response to different Implant neck design

• Bae HE
• Chung MK
• Cha IH
• Han DH

Abstract

STATEMENT OF PROBLEM: Loss of the marginal bone to the first thread have been accepted but continuous effort have been made to reduce this bone loss by varying implant design and surface texture. PURPOSE: This animal study has examined the histomorphometric variations between implants with micro-thread, micro-grooved and turned surfaced neck designs. MATERIAL AND METHODS: Four mongrel dogs have been used the premolars removed and left to heal for three months. One of each implant systems with turned neck, micro-thread and micro-grooved were placed according to the manufacturers' protocol and left submerged for 8 and 12 weeks. These were then harvested for histological examination.
RESULTS
The histologically all samples were successfully ossointegrated and active bone remodelling adjacent to implants. With the micro-grooved implants 0.40 mm and 0.26 mm of the marginal bone level changes were observed at 8 and 12 weeks respectively. The micro-threaded implants had changes of 0.79 mm and 0.56 mm at 8 and 12 weeks respectably. The turned neck designed implants had marginal bone level changes of 1.61 mm and 1.63 mm in 8 and 12 weeks specimens. A complex soft tissue arrangement could be observed against micro-threaded and micro-grooved implant surfaces.
CONCLUSION
Within the limitations of this study, it could be concluded that implants with micro-grooved had the least and the turned neck designed implants had the most changes in the marginal bone level. The textured implant surfaces affect soft tissue responses.

Keyword

Micro texture; Marginal bone level; Implant design

MeSH Terms

Animals
Bicuspid
Dogs
Neck

Figure

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  Fig. 1. Three different types of implant neck designs. A: Turned neck implants, B: Micro - threaded implants, C: Micro - grooved implants

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  Fig. 2. Implant specimens in H & E staining and under polarised light. A, B, C H & E staining a, b, c MT staining under polarized light

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  Fig. 3. Bone attachment (B) over 12 ㎛ micro-grooved area and fibroblasts (F) attachments over 8 ㎛ micro-grooved area. Magnification ×100.

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  Fig. 4. ‘Disturbed’ layer of soft tissue over the 8 ㎛ micro-grooved implant surface. Magnification × 400.

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  Fig. 5. The difference in the collagen organisation over the two different implant surfaces. The surface changes from 8 ㎛ MG to turned surface; Note the changes in the soft tissue organization direction. Magnification × 400.

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