الفهرس 
Effect of Magnetic Attachment versus Ball and Socket Attachment in Implant Mandibular Overdentures on Denture Retention (Randomized controlled Trial)
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Abstract
This study was conducted on 28 completely edentulous patients to compare between implant-supported magnet retained mandibular overdentures versus implant-supported ball and socket retained mandibular overdentures in terms of retention and patients satisfaction. At the beginning, conventional complete dentures were constructed for all the patients. A CBCT was performed before implant surgical procedure with the aid of radiographic stent. Two implants were placed in a conventional manner interforaminally at the canine area bilaterally. After suture removal the implants were left for two months to allow for osseointegration and throughout the healing period the patients were instructed to wear their conventional dentures after adjustment and application of soft liner. After the osseointegration period, the prosthetic phase was initiated. Then the patients were randomized to be divided into two groups identical in number, 14 patients in each group. The first group: received ball and socket attachments, the second group: received magnet attachments. Retention was measured for each group (baseline, 1month, 3 months and 6 months) by using a digital force-meter where pulling force was applied gradually until the denture was dislodged. The retentive force was measured for the initial separation of the mandibular overdenture