الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 179 |  |  |
| | | from | 179 | | |
Abstract
This study was conducted to compare the influence of incorporating a cantilever extension in two implant supported bar mandibular overdentures on the peri-implant tissues and ridge resorption.
Two groups of completely edentulous patients receiving two implants in the mandibular canine region were evaluated regarding; modified plaque index (MPI), modified gingival index (MGI), peri-implant probing depth, marginal bone height, bone density around the implants and posterior ridge resorption clinically and radiographically.
The comparison including modified plaque index, modified gingival index, peri-implant probing depth, marginal bone loss, bone density changes, around each implant from the time of placement and loading and up to one year.
Ten completely edentulous patients were selected for this study. All patients were systemically free and accepted implant overdenture treatment modality.
Pre-operative computed tomography cone-beam (CBCT) was performed to exclude the presence of any pathological condition and to check the quality and quantity of the available alveolar bone at the planned implant site.
All patients received new upper and lower complete dentures constructed using the conventional method. For each patient, a customized surgical guide was fabricated using CAD/CAM technology through the data obtained from the cone-beam computed tomography (CBCT). Captured images by CBCT was imported into viewing software then sent for fabrication of the guide using CAD/CAM technology.
Fabricated surgical guides were made from clear acrylic resin and contained metal housings that accurately fit the provided removable sleeves by the manufacturer. Three lateral cylinders were provided in each guide to allow the placement of anchor pins for fixation of the guide.
For each patient, punch technique was used to dissect the gingival tissue covering the planned implants sites from the surrounding tissues after creating two bleeding points through the holes of the surgical guide.
The guide was fixed using the anchor pins and the implants were placed in the planned sites then loaded after 3 months.
For each patient, two root-form endosseous implants were placed at the mandibular canine areas. Patients were divided into two groups simultaneously. The mandibular canine area of all patients received removable complete overdenture supported and retained to the implants with metallic bar attachment with bilateral posterior extension (group I), while removable complete overdenture supported and retained to the implants with metallic bar attachment with no posterior extension (group II). All implants were of the same length [13 mm] and the same diameter [(3.5 mm].