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Submitted: 27 Jun 2009
Accepted: 01 Sep 2009
ePublished: 21 Sep 2009
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J Periodontol Implant Dent. 2009;1(1): 36-42.
  Abstract View: 132
  PDF Download: 87

Research Article

Evaluating Stability Changes of Tapered Roughened Surface Implants in Different Bone Types: A Prospective Clinical Cohort Study

Amir Reza Rokn 1, Amir Ali Reza Rasouli Ghahroudi 2*, Abolhasan Mesgarzadeh 3, Seyed Asghar Miremadi 4, Mohammad Javad Kharrazi Fard 5

1 Associate Professor, Department of Periodontics, Faculty of Dentistry and Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran
2 Assistant Professor, Department of Periodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
3 Associate Professor, Department of Oral & Maxillofacial Surgery, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
4 Associate Professor, Department of Periodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
5 Statistical Consultant, Dental Research Center, Tehran University of Medical Sciences, Tehran, Iran
Corresponding Author; E-mail: amirali_rasouli@yahoo.com

Abstract

Background and aims. Implant stability of different designs have shown to be variable. The aim of this study was to evaluate the stability changes as a reflection of early healing around roughened-surface implants in human using resonance frequency analysis (RFA).

Materials and methods. 153 Branemark Replace tapered Ti-uniteTM implants in 68 patients were placed in the maxilla or mandible. Bone type was classified into one of 4 groups according to Lekholm and Zarb index. RFA was used for direct implant stability measurement on the day of implant placement and at 14, 30 and 60 days after placement.

Results. No early failure occurred. The lowest primary stability measurement was observed in type 4 bone. Student t-test for comparison of bone groups at each time point revealed no significant difference between implant stability in all bone types (P > 0.05). In testing the effect of implant length and diameter with time using the mixed model ANOVA according to implant length, there was not any significant difference between groups (P > 0.05); however, implant diameter showed a significant effect on implant stability. There were no significant differences in implant stability between genders (P > 0.05).

Conclusion. According to the results, pattern of stability changes are not different among different bone types.

Keywords: Bone quality, resonance frequency, stability measurement, tapered implants
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