Session 1 Chair: Tetsuo Ohyama (Nihon University)



Randomized controlled clinical trial of immediately loaded mandibular 2-implant overdenture retained by magnetic attachments: preliminary report


M. Kanazawa1,2, Y. Omura1, D. SATO2, M. Ochi1 and S. Minakuchi1


1Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences,

Tokyo Medical and Dental University

2Faculty of Dentistry, McGill University




 The null hypothesis of this randomized controlled trial was that there was no difference between immediate loading and conventional loading of implant overdentures with magnetic attachments in terms of the implant survival rate and patient reported outcome applying CAD/CAM template guided flapless surgery.
 Nineteen participants with edentulous mandible enrolled in this randomized controlled clinical trial. Two implants (Speedy Groovy, Nobel Biocare), were inserted. The two magnetic attachments (Magfit, Aichi Steel Corporation, Aichi, Japan) were positioned into the mandibular complete denture at the surgery day in immediate group and 3 months after surgery in conventional group. Subjects were seen for follow-up examinations after 1, 2, 3, 4, 5, 6 months. The survival of each implant was evaluated clinically and radiographically. Surgical and prosthetic complications were recorded. OHIP-EDENT-J was used for patient reported outcome.
 During the initial healing period, 2 implants failed in one patient in conventional group. The cumulative implant survival rates at 6 months were 100% in immediate group and 88.9% in conventional group. In this 6 months preliminary study, the immediate loading of 2-implant mandibular overdentures with magnetic attachments resulted in favorable implant survival and oral health related quality of life compared to conventional loading.