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:: Volume 35, Number 1 (winter 2017) ::
J Dent Sch GYEAR__, 35(1): 41-52 Back to browse issues page
Comparison of the Effect of Ball and Bar Attachment Designs on Retention and Stability of Mandibular Implant-Supported Overdentures
Abolfazl Sabouri, Negar Barjini *, Farhad Tabatabaian
Dept. of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran , negar66@gmail.com
Abstract:   (261 Views)

Objectives: The present study evaluated the effect of bar and ball attachment designs on retention and stability of a mandibular overdenture supported by four implants.

Methods: An edentulous mandibular acrylic resin model with four implants in the anterior part of the ridge (A, B, D and E) was fabricated. A metal framework simulating the overdenture was also fabricated. Totally, 30 overdentures were divided into three groups based on the attachment design; BL: Four ball attachments in A, B, D and E positions; BB: One bar attachment between B and D positions and two ball attachments at positions A and E; BR: Bar attachments between the positions A, B, D and E with two posterior extensions. To evaluate the retention and stability of the overdenture, tensile dislodging forces were applied in three directions of vertical, oblique and anterior-posterior by a universal testing machine. One-way ANOVA and Tukey’s HSD test were performed to analyze the data. All tests were carried out at 0.05 level of significance.

Results: There were statistically significant differences between the groups in the peak load (P<0.001). The peak load values for vertical, oblique and anterior-posterior dislodging forces were the highest for BL with 49.38 ± 2.19 N, 52.19 ± 1.44 N, and 49.03 ± 5.89 N, respectively, while these values were the lowest for BR with 29.78 ± 2.52 N, 12.10 ± 0.45 N, and 6.26 ± 0.45 N, respectively.

Conclusion: The attachment designs affected the retention and stability of mandibular implant-supported overdentures

Keywords: Denture Precision Attachment, Denture Retention, Denture, Overlay, Dental Implants, Mandible
Full-Text [PDF 422 kb]   (105 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2016/12/19 | Accepted: 2017/03/9 | Published: 2017/07/3
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Sabouri A, Barjini N, Tabatabaian F. Comparison of the Effect of Ball and Bar Attachment Designs on Retention and Stability of Mandibular Implant-Supported Overdentures. J Dent Sch. 2017; 35 (1) :41-52
URL: http://jds.sbmu.ac.ir/article-1-1575-en.html
Volume 35, Number 1 (winter 2017) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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