الفهرس 
Abstract
Retention in complete dentureOnly 14 pages are availabe for public view
 |  | from | 142 |  |  |
| | | from | 142 | | |
Abstract
Purpose: evaluation and comparison the effect of palatal coverage on the retention force and fatigue resistance of attachment system of mini dental implant (MDIs) overdenture.Materials and methods: heat cured polymethylmethacrylate resin maxillary acrylic resin model was used for this study. Five 2.5 X 13mm dummy mini dental implants with O-ring attachment were placed parallel to each other. Palateless implant retained overdentures and full coverage implant retained overdentures were constructed on the model. Both of them, retention and cyclic fatigue tests of each overdenture were measured using BENDAO tools of the universal testing machine and average reading was calculated.Result: (group I) mini dental implant overdenture with palatal coverage recorded higher retention means value (25.55 ± 2.17 N) than (group II) mini dental implant over denture without palatal coverage (palateless overdenture) (24.215 ± 3.64 N). the cyclic fatigue test for the (group I) mini dental implant over denture with palatal coverage showed that the retention decreased significantly with time as indicated by ANOVA test (p <0.05), While for (group II) mini dental implant overdenture without palatal coverage (palateless overdenture) was found that the retention was insignificant decrease in the first month; then it significantly decrease in the remaining periods of the study as indicated by ANOVA test (p <0.05).