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http://dx.doi.org/10.4047/jap.2011.3.1.1

Strain of implants depending on occlusion types in mandibular implant-supported fixed prostheses  

Sohn, Byoung-Sup (Department of Prosthodontics and Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry,Seoul National University)
Heo, Seong-Joo (Department of Prosthodontics and Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry,Seoul National University)
Koak, Jai-Young (Department of Prosthodontics and Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry,Seoul National University)
Kim, Seong-Kyun (Department of Prosthodontics and Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry,Seoul National University)
Lee, Su-Young (Department of Prosthodontics & Dental Research Institute, School of Dentistry,Seoul National University)
Publication Information
The Journal of Advanced Prosthodontics / v.3, no.1, 2011 , pp. 1-9 More about this Journal
Abstract
PURPOSE. This study investigated the strain of implants using a chewing simulator with strain gauges in mandibular implant-supported fixed prostheses under various dynamic loads. MATERIALS AND METHODS. Three implant-supported 5-unit fixed prostheses were fabricated with three different occlusion types (Group I: Canine protected occlusion, Group II: Unilaterally balanced occlusion, Group III: Bilaterally balanced occlusion). Two strain gauges were attached to each implant abutment. The programmed dynamic loads (0 - 300 N) were applied using a chewing simulator (MTS 858 Mini Bionix II systems, MTS systems corp., Minn, USA) and the strains were monitored. The statistical analyses were performed using the paired t-test and the ANOVA. RESULTS. The mean strain values (MSV) for the working sides were 151.83 ${\mu}{\varepsilon}$, 176.23 ${\mu}{\varepsilon}$, and 131.07 ${\mu}{\varepsilon}$ for Group I, Group II, and Group III, respectively. There was a significant difference between Group II and Group III (P < .05). Also, the MSV for non-working side were 58.29 ${\mu}{\varepsilon}$, 72.64 ${\mu}{\varepsilon}$, and 98.93 ${\mu}{\varepsilon}$ for Group I, Group II, and Group III, respectively. One was significantly different from the others with a 95% confidence interval (P < .05). CONCLUSION. The MSV for the working side of Groups I and II were significantly different from that for the non-working side (Group I: t = 7.58, Group II: t = 6.25). The MSV for the working side of Group II showed significantly larger than that of Group III (P < .01). Lastly, the MSV for the non-working side of Group III showed significantly larger than those of Group I or Group II (P < .01).
Keywords
Strain; MTS machine; Implant-supported fixed prosthesis; Occlusion type;
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