الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 132 |  |  |
| | | from | 132 | | |
Abstract
This study was conducted to evaluate different types of telescopic copings; the rigid and non-rigid types used to retain two-implant mandibular overdenture.
Twelve completely edentulous patients free from any systemic diseases or conditions that may affect bone quality or quantity or healing process were selected in the study. Patients had complete dentures and received two mandibular interforaminal implants to retain overdenture. Implants were left covered for three months for delayed loading protocol.
Patients were randomly allocated into two groups; the first group received rigid telescopic copings and the second group had non-rigid attachments. Direct pick-up of the second titanium coping was done.
Evaluation was done clinically and radiographically. Clinical evaluation based on gingival index, implant stability using Osstell device, oral health related quality of life using OHIP14 questionnaire. Radiographic evaluation using standardized digital periapical long cone parallel technique was done to evaluate peri-implant bone loss and posterior bone loss in the area of mandibular first molar bilaterally. Evaluation was done immediately after overdenture insertion, six, and twelve months post insertion.
Clinical results showed proper peri-implant gingival health with no bleeding on probing in all patients, acceptable levels of implant stability, and high quality of life in both groups.
Radiographic evaluation revealed mild within normal peri-implant bone loss less than 0.5mm with no significant difference between both groups. However, posterior bone loss was higher in the non-rigid telescopic group with statistical significance; the mean bone loss equals 0.63mm after one year. This bone loss resulted from the movement of the denture over the ridge area due to the resiliency of the connector.
Within the limitations of this study, both rigid and non-rigid telescopic attachments can be used in two-implant supported mandibular overdenture opposing maxillary complete denture. There is no significant difference between both groups regarding clinical evaluation examining gingival index, implant stability, oral health related quality of life; nor radiographic evaluation examining peri-implant bone loss. The only observed significant difference was associated with posterior bone loss in favor of rigid telescopic attachment.