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:: Volume 30, Number 1 (Spring 2012) ::
J Dent Sch GYEAR__, 30(1): 40-49 Back to browse issues page
The effect of implant position on the retention and stability of mandibular implant-supported overdentures
Dr. SJ. Sadr, Corresponding Author: Dr. A. Saboury *, Dr. A. Hadi, Dr. M. Mahshid
Associate Professor Dept.of Prosthodontics , drhadi.alireza@gmail.com
Abstract:   (3612 Views)

Background and Aim: The standard of treatment of edentulous people is implant retained overdenture. The aim of this study was to compare the effect of different implant location (ABDE, 6AE6, 6BD6) on the retention and stability of mandibular implant overdenture with ball attachment.

Materials & Methods: An experimental study was designed. An acrylic resin model of edentulous mandible with six implant in the location of first molars, first premolar and between lateral incisor and canine on the left and right side was fabricated. A metallic overdenture was fabricated precisely adapted to the model and attached to a Zwick testing machine (crosshead speed of 51 mm/min). The ball attachments were screw in three ways. First the balls in ABDE, then ball in 6AE6 and then balls in 6BD6 position were screwed. Dislodging tensile forces were applied in three vertical, oblique, anterior-posterior directions for each sample. For each of these three situations, five tests were done. The maximum dislodging force was measured. Normal distributions of data were analyzed with Shapiro-Wilk test. Levene test analazed the variances. A Three-way ANOVA test was employed followed by Tukey’s test.

Results: The amount of vertical load is significantly higher than the oblique and Ant-post load (P<0.001). The amount of ant-post load is signifivantly higher than the oblique load (P<0.001). The average of MDF is significantly higher in 6BD6 position (P<0.001). This average is also signifivatnly lower in ABDE position (P<0.001). The amount of measured force in ABDE and 6BD6 position was the least and the most respectively (ABDE=64.51 N and 6AE6=66.06 N). Vertical and oblique dislodging force are the minimum and maximum measured forces respectively (mean vertical= 87.95 N, mean Lateral= 48.1 N and mean Ant.Post= 63.5 N)

Conclusion: Lateral and Ant.Post dislodgment values are higher in 6BD6 and 6AE6 respectively. In vertical dislodgment the retention values in the most in 6BD6 position. Vertical retention in higher than lateral and Ant.Post retentions. The more posterior position the distal implant the more the retention and stability.

Keywords: Dental implant, retention, stability, mandibular overdenture
Full-Text [PDF 167 kb]   (1647 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2012/02/28
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Sadr S, Saboury A, Hadi A, Mahshid M. The effect of implant position on the retention and stability of mandibular implant-supported overdentures. J Dent Sch. 2012; 30 (1) :40-49
URL: http://jds.sbmu.ac.ir/article-1-953-en.html
Volume 30, Number 1 (Spring 2012) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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