日本口腔インプラント学会誌
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
原著
磁性アタッチメントによるインプラントオーバーデンチャーの維持力に関する 実験的検討:垂直方向への牽引で生じる維持力
村山 大悟宮坂 平入江 修充青木 春美
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ジャーナル フリー

2012 年 25 巻 2 号 p. 271-281

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The aim of this study was to evaluate the clinical retention force of implant magnetic dentures. Dental implants for a demonstration were implanted into a model of an edentulous jaw, and a maxillary roofless denture, on which a magnetic attachment was placed, was made. The magnetic attachments were placed at the positions corresponding to 17, 14, 12, 22, 24, and 27 in the FDI dental formula. Three types of magnetic attachment, i. e., flat-type, cushion-type and dome-type, were used. A tensile load was applied at one of two positions to remove the denture from the model: one was the center of both maxillary center incisors (front center), and the other was the barycenter of the positions of 6 magnetic attachments (barycenter). The effects of the locations of magnetic attachments, types of attachment, and positions of applying tensile load on the retention force were investigated, and the following conclusions were drawn.
1. The maximum retention force increased with the number of magnetic attachments, regardless of the tensile load application position, and the effect of the type of magnetic attachment in descending order was flat-type, cushion-type and dome-type.
2. The two-factor interaction between magnetic attachment location and type on retention force indicated that the difference among magnetic attachment types was small if the number of magnetic attachments was small, but the difference between the flat-type or the cushion-type and the dome-type became significantly large as the number of magnetic attachments increased. This tendency was more pronounced when the number of magnetic attachments was greater than four.
3. The two-factor interaction between magnetic attachment location and tensile load application position indicated that the retention force of the barycenter was greater than that of the front center in general, but the difference between the retention force of the two positions became significantly large as the number of magnetic attachments increased.
4. The two-factor interaction between the type of magnetic attachment and tensile load application position indicated that the retention force decreased in descending order of flat-type, cushion-type and dome-type, and the difference became large when the tensile load application position was the barycenter.
5. The retention force was strongly positively correlated with the area surrounded by magnetic attachments when the tensile load was applied to the barycenter, and increased with an increase of the area, although the correlation was poor when the tensile load application position was the front center.

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© 2012 公益社団法人日本口腔インプラント学会
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