الفهرس 
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Abstract
The study was carried to evaluate and compare the effect of different degree of resiliency of locator attachment (blue replacement insert and transparent replacement insert) in implant retained mandibular overdenture by measuring bone height change.
Tweleve male patients were selected from among those attending the out-patient clinic, Prosthodontic 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 implant retained mandibular overdenture by locator attachment. Standard clinical and laboratory techniques were followed for denture construction for all patients. Patients participating in this study were randomly divided into two equal groups according to the resiliency of the male nylon insert .
group I: A blue replacement insert was seated into the metal housing for this group of patients .
group II: A transparent replacement insert was seated into the metal housing for this group of patients.
Surgical installation of the implant was performed under strict aseptic conditions and delayed loading protocol was followed.
Patients were recalled frequently for post-insertion inspection and adjustments. Follow-up visits were scheduled at time of denture insertion, six, twelve after insertion for inspection of the prosthesis and radiographic evaluation of the peri-implant supporting structures using. Marginal bone height change around the implants was evaluated using the linear measurement system supplied by the cone beam computed tomography
Results obtained from this study showed
- Statistically significant decrease in peri-implant bone height for the two studied groups.
- Significant crestal bone loss was detected distal to implant in the two studied groups six and twelve months following implant loading.
- group (II) patients scored a significant decrease of crestal bone height throughout the time of the study period.