title: The effect of inter-implant distance on retention and resistance to dislodging forces for mandibular implant-tissue-supported overdentures.
abstract: OBJECTIVE
  The effect of inter-implant distance on retention and resistance of implant-tissue-supported overdentures is lacking in the literature. An in vitro study was performed to evaluate this effect for mandibular implant-tissue-supported overdentures retained by two ball attachments.
  
  
  METHODS
  An acrylic cast of an edentulous mandible was fabricated. Three pairs of implants were symmetrically placed at both sides of the midline. The inter-implant distance was 10, 25, and 35 millimeters in positions A, B and C, respectively. A framework simulating the overdenture was fabricated on the cast. Six attachment housings were placed within the overdenture. For each sample, two ball abutments were screwed onto the implant pairs and two pink nylon inserts were seated in their respective attachment housings. The samples were tested in three groups of 15 (A, B, and C). The testing machine applied tensile dislodging forces and peak loads were measured in three directions: vertical, oblique, and anterior-posterior. A one-way ANOVA followed by Tukey's HSD was used to determine groups that were significantly different. Tests were carried out at 0.05 level of significance.
  
  
  RESULTS
  Peak loads for the anterior-posteriorly directed dislodging forces were significantly the highest for group C (P<0.05); 21.25 N±3.05 N, while there were no statistically significant differences among groups with vertically and obliquely directed forces (P>0.05).
  
  
  CONCLUSIONS
  Inter-implant distance did not affect the vertical retention and oblique resistance of mandibular implant-tissue-supported overdentures; however, it affected anterior-posterior resistance.
authors: Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Farhad
authors: F
authors: Tabatabaian
authors: Associate Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Abolfazl
authors: A
authors: Saboury
authors: Former Student, Dental School of Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Zahra Sadat
authors: ZS
authors: Sobhani
authors: Associate Professor, Department of Preventive and Restorative Sciences, University of Pennsylvania School of Dental Medicine, United States.
authors: Vicki C
authors: VC
authors: Petropoulos
keywords: Dental Implant; Dental Prosthesis Retention; Implant-Supported Dental Prosthesis; Overdenture
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