J Korean Assoc Oral Maxillofac Surg 2009; 35(4): 240~247
Su-Jin Choi, Young-Deok Chee, Se-Wook Koh
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Purpose: The purpose of this study was to evaluate marginal bone loss to the bone crest functionally loaded for up to eighteen months and also with
regard to other variables of interest.
Material and Methods: 135 endosseous implants(GS II, Osstem, South Korea) were placed in 35 patients. The design of GS II implant is straight
with the microthread. Radiographic examinations were conducted at baseline (implant loading) and 3, 6, 9, 12 and 18 months after loading. Marginal
bone level measurement was made from the reference point to the lowest observed point of contact of the marginal bone with the fixture. The reference
point of the fixture was the border between the blasted surface and machined surface of the fixture.
Results: Implants were on function for a mean 12.7 months(range, 3?18 months). For the 56 maxillary and 79 mandibular implants, mean marginal
bone loss was 0.68 mm and 0.70 mm. Implants placed maxillary posterior area displayed more crestal bone loss than the other position. The difference
between mesial and distal bone levels was statistically significant (p<0.05) with respective means of 0.51 mm and 0.62 mm. Also, The difference
between bone graft group and no-bone graft group was statistically significant(p<0.05) with respective means of 0.38 mm and 0.66 mm.
But no statistically significant influence of sex, type of surgery(one or two stage surgery), the implant length was observed(p>0.05).
Conclusion: This study indicates the amount of marginal bone loss around implant has maintained a relative stable during follow-up periods.
Keywords: : marginal bone loss, implant design, microthread

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