definitive restoration - soft tissue level implant、platform switched implants、platform switching、pink esthetic score

美國植體品牌 - Marginal tissue response to different implant neck design

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學術文章：
Marginal tissue response to different implant neck design.

作者：HEK Bae, MK Chung, IH Cha and DH Han.
出處：Yonsei University College of Dentistry, Seoul, South Korea J Korean Acad Prosthodont. 2008 Dec;46(6):602-609.

摘要：
ABSTRACT

Purpose:

This animal study examined the histomorphometric variations between a turned neck (TN) implant with a RBM body, a micro-threaded (MT) neck implant and a micro-grooved (MG) implant (Laser-Lok).

Materials and Methods:

Mandibular premolars from four mongrel dogs were removed and left to heal for three months. One of three different implant systems were placed according to the manufacturers’ protocol and left submerged for 8 and 12 weeks. These were then harvested for histological examination. All specimens have shown uneventful healing for the duration of the experiment.

Results:

The histological slides have shown that all samples osseointegrated successfully with active bone remodeling adjacent to the implants. With the Laser-Lok implants, 0.40mm and 0.26mm of marginal bone loss was observed at 8 and 12 weeks respectively. The micro-threaded implants had changes of 0.79mm and 0.56mm. The machined neck implants had marginal bone level changes of 1.61mm and 1.63mm in the 8 and 12 week specimens. A complex soft tissue arrangement was observed against micro-threaded and micro-grooved implants.

Conclusions:

This is an animal study which looked at the marginal bone level and the soft tissue reaction between different implant systems with various neck designs. Within the limitation of this animal study the following statement can be concluded;

1. A clear morphometric difference in the bone area could not be noticed between MT and MG implant neck types.2. The BIC in MG implants were slightly higher than corresponding healing times of MT and TN implants. Higher values of the BIC could be measured in week 12 specimens than in week 8 specimens. 3. In the marginal bone level, there was marked lowering with the TN implants and least with MG implants from the reference point. There were higher marginal bone levels in week 12 than week 8 in MT and MG implants specimens but with minimal differences in TN implant specimens. 4. With MT and MG implant surfaces, the collagen alignments were not parallel to the long axis of the implants. The MT and MG implants, especially MG implants had advantageous tissue response in comparison to the turned neck implants.

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