الفهرس 
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Abstract
The aim of the study is to evaluate the effect of using different abutment materials (BioHPP and cobalt chromium) on the crestal bone loss around the implants in mandibular telescopic implant overdenture.
Fourteen completely edentulous patients were selected from the outpatient clinic, removable prosthodontics department, Faculty of Dentistry, Ain Shams University to participate in this study.
Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the results of this study.
Patients were rehabilitated by mucosa supported maxillary complete denture and two implant retained telescopic mandibular overdenture following the two stage surgical technique.
After 3 months of osseointegration, according to the type of abutment screwed to the implant, the patients were divided into two equal groups.
group one:: Patients of this group were rehabilitated by telescopic implant retained mandibular overdenture with primary and secondary coping made from cobalt chromium alloy.
group two: Patients of this group were rehabilitated by telescopic implant retained mandibular overdenture with primary and secondary coping made from BioHPP.
Standard clinical and laboratory techniques were followed for denture construction for all patients. Patients were frequently recalled for inspection and post insertion adjustments. Follow up visits were scheduled at time of implant loading, six, and twelve months after loading for making radiographic records required to evaluate the implant marginal bone height changes. Marginal bone height change around the implants was evaluated using the linear measurement system supplied by the CBCT.
Results obtained from this study showed statistically significant decrease in peri-implant bone height for the two studied groups at the end of the one year follow up period.
Crestal bone loss of the two groups was within the normal range of first year bone loss (less than 2 mm).
group (two) patients (BioHPP abutments) showed a lesser decrease of crestal bone height at the interval from zero to six months and from zero to twelve months follow up periods.