アブストラクト（31巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： The Effect of Removal Angulation on the Retention of Ball Attachments
Subtitle　： ORIGINAL ARTICLES
Authors　： Satoru Hojo1), Kent T.Ochiai2), Minoru Toyoda1), Chizuru Maruyama3), Masahiro Ishida1), Etsuro Matsuo1), Angelo A.Caputo2)
Authors（kana）　：
Organization　： 1)Department of Prosthetics, Kanagawa Dental College, 2)Department of Biomaterials, UCLA School of Dentistry, 3)Department of Maxillofacial Prosthetics, UCLA School of Dentistry
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 31
Number　： 2
Page　： 117-121
Year/Month　： 2003 / 9
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： Implants provide effective positioning and retention of maxillofacial prostheses, especially when the defect contraindicates the use of adhesives. The margins of the defect may not be lined with thin, keratinized and immobile soft tissue. The anatomy of the resultant defect may require that the prosthesis be inserted and removed in a path that is not ideal for the retentive elements used on the implants. The retention of ball attachments may be affected by the angle of insertion and removal. The purpose of this study is to examine the influence of angulation of removal on the retention of ball attachments using the Epitec system. Method: Two implant abutments(EPITEC Titanium Implants)with ball attachments were embedded in a stone block 50×30×30 mm apart parallel to each other to represent a maxillofacial situation. Ball attachments(Epitec system)were placed on the implants. The matrix portions of the attachments were embedded singly and in a pair into cold cure resin. A wire attached to the resin was placed in the grips of an Instron test machine. The force required to dislodge the single and double ball attachments was measured at angulations of 0, 10, 20 and 30 degrees to the implant axes at a crosshead speed of 1 in/min. Results: The retention of ball attachments was significantly higher when removed at a 0°angulation. There was no significant difference in retention between the 10, 20, and 30°angled pulls. The retention value obtained with the double ball attachments was typically more than double the value obtained with a single ball attachment for all angles of pull. The ball attachments in the Epitec Implant system may provide effective retention of maxillofacial prostheses in some cases.
Practice　： Dentistry
Keywords　： Epitec system, Retention, Ball-attachments