title: Marginal bone resorption around immediate and delayed loaded implants supporting a locator-retained mandibular overdenture. A 1-year randomised controlled trial.
abstract: The aim of this 1-year study was to evaluate and compare crestal bone loss and clinical outcomes of immediate and delayed loaded implants supporting mandibular overdentures with Locator attachments. In a randomised controlled clinical trial, 36 completely edentulous patients (mean age 59.6 years) who desired to improve the stability of their mandibular dentures were randomly assigned into two groups. Each patient received two implants in the canine area of the mandible after a minimal flap reflection. Implants were loaded by mandibular overdentures either 3 months (delayed loading group, G1) or the same day (immediate loading group, G2) after implant placement. Locator attachments were used to retain all overdentures to the implants. Peri-implant vertical (VBL) and horizontal (HBLO) bone losses and clinical parameters [plaque scores (PI), gingival scores (GI), probing depths (PD) and implant stability (ISQ)] were assessed at time of overdenture insertion (T0), 6 months (T6) and 12 months (T12) after overdenture insertion. After 12 months of overdenture insertion, two implants (5.5%) failed in G2. Vertical bone loss was significantly higher in G2 compared with G1, while HBLO demonstrated insignificant differences between groups. All clinical parameters (PI, GI, PD and ISQ) did not differ significantly between groups. Vertical bone loss was significantly correlated with PD and HBLO. Immediately loaded two implants supporting a Locator-retained mandibular overdenture are associated with more vertical bone resorption when compared to delayed loaded implants after 1 year. Clinical outcomes do not differ significantly between loading protocols.
authors.affiliation: Department of Removable Prosthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
authors.forename: M A
authors.initials: MA
authors.lastname: Elsyad
authors.forename: E A
authors.initials: EA
authors.lastname: Elsaih
authors.forename: A S
authors.initials: AS
authors.lastname: Khairallah
mesh_terms: D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging; D001862:Bone Resorption / Q000000981:diagnostic imaging; D003758:Dental Implantation, Endosseous / Q000379:methods; D003779:Denture Design; D003828:Denture, Overlay; D005260:Female; D006801:Humans; D057893:Immediate Dental Implant Loading; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging / Q000601:surgery*; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery*; D008336:Mandibular Diseases / Q000000981:diagnostic imaging*; D008875:Middle Aged; D012307:Risk Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
keywords: bone loss; immediate loading; implant; locator; overdentures