title: Comparison of marginal bone loss and patient satisfaction in single and double-implant assisted mandibular overdenture by immediate loading.
abstract: OBJECTIVE
  The purpose of this study was to compare the coronal bone level and patient satisfaction in 1-implant and 2-implant assisted mandibular overdentures.
  
  
  METHODS
  Twenty patients who had maladaptive mandibular dentures were treated in this study. Patients were randomly divided into two groups. The first group received 1 implant (Simple line II, Implantium, South Korea) in their mandibular midline and the second group received 2 implants in their B and D regions (according to Misch's category). If the primary stability of each implant was at least 60 ISQ, ball attachment was placed and denture relined with soft liner. After 6 weeks, retentive cap incorporated with hard acrylic resin. In the 6 and 12 months recalls, periapical digital radiograph were made and visual analogue scale questionnaires were used to record patient satisfaction. The Friedman test was done for comparing the presurgical and postsurgical parameters in each group and the U-Mann Whitney test (P<.05) was done for comparison of post-treatment results between the two groups.
  
  
  RESULTS
  All implants achieved sufficient primary stability to be immediately loaded. Patient satisfaction was high, and there were no significant differences between two groups (P>.05). In addition, mean marginal bone loss was 0.6 ± 0.67 mm in the first group and 0.6 ± 0.51 mm in the second group, after 12 month. Mean marginal bone loss showed no significant differences between two groups.
  
  
  CONCLUSIONS
  This preliminary one-year result indicated that mandibular overdentures anchored to a single implant can be a safe and cost-effective method as a starting step for implant-overdenture treatment.
authors.affiliation: TMD Center, INI Hospital, Hannover, Germany.
authors.forename: Sara
authors.initials: S
authors.lastname: Tavakolizadeh
authors.affiliation: Hamadan University of Dental Science, Hamadan, Iran.
authors.forename: Fariborz
authors.initials: F
authors.lastname: Vafaee
authors.affiliation: Hamadan University of Dental Science, Hamadan, Iran.
authors.forename: Masume
authors.initials: M
authors.lastname: Khoshhal
authors.affiliation: Periodontist, Tehran, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Ebrahimzadeh
keywords: Bone loss; Implant; Overdenture; Patients satisfaction