International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 8 , ISSUE 2 ( April-June, 2018 ) > List of Articles


Change in Retention Force and Angulation Limit of an Attachment System with Silicone Soft Relining Material for Implant-retained Complete Dentures

Kaoru Sakurai, Takashi Koike, Koichiro Ogami, Takayuki Ueda, Keitaro Kubo, Tatsuyuki Kono

Keywords : Attachment, Laboratory research, Overdenture, Prosthodontics, Removable denture, Soft relining material.

Citation Information : Sakurai K, Koike T, Ogami K, Ueda T, Kubo K, Kono T. Change in Retention Force and Angulation Limit of an Attachment System with Silicone Soft Relining Material for Implant-retained Complete Dentures. Int J Prosthodont Restor Dent 2018; 8 (2):40-43.

DOI: 10.5005/jp-journals-10019-1202

License: CC BY-SA 4.0

Published Online: 01-12-2010

Copyright Statement:  Copyright © 2018; The Author(s).


Aim: We investigated attenuation of the retention force on the female end (silicone soft relining material) with repeated mounting/ removal and determined the allowable angle between the male ends for mounting/removal. Materials and methods: Attachments consisting of metal ball anchors (diameter 2.5, 2.7, or 3.0 mm) for the male end and a silicone soft relining material for the female end were subjected to retention force measurement and allowable angle tests. The frequency of mounting/removal in 1 year was estimated assuming mounting/removal four times a day. The allowable angle test used two pairs of male ends with the between-male angle set at 0, 15, 30, or 45°, and the angle between the male ends joined with the female end was measured. The retention force at the initiation of the experiment and at each time-point was compared using one-way analysis of variance (ANOVA) followed by Dunnett's test (á = 0.05). Results: The retention forces of the male ends with a diameter of 2.5, 2.7, or 3.0 mm at the initiation of the experiment were 3.8 ± 0.3, 5.2 ± 0.2, and 5.5 ± 0.2 N respectively. After repeated mounting and removal corresponding to use for 1 year, a significant decrease in retention force was noted in all male ends (3.3 ± 0.1, 3.8 ± 0.2, and 4.3 ± 0.1 N respectively). It was also found that mounting/removal was possible up to a betweenmale- end angle of 45°. Conclusion: Under the conditions of this experiment, the retention force decreased with repeated mounting and removal of the female end prepared with silicone soft relining material. Additionally, a large between-male angle for mounting/removal was allowable, and mounting/removal was possible up to 45°. Clinical significance: This system may save time and expense and could be used to treat patients easily in their home or a nursing home.

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