Evaluation of The Occlusion and Dis-Occlusion Time in Mandibular Single Overdentures Supported by Conventional Versus Mini- Dental Implants; A Parallel Blinded Randomized Clinical Trial

Twenty eight patients will be selected to share in this study from the outpatient clinic of Prosthodontics Department, Faculty of Dentistry, Ain-Shams University.

Sample size was calculated according to these values producing a minimal sample size of Twenty eight patients being enough to find such a difference. The size was determined in the light of the study " Computerized occlusal analysis of mini-dental implant-retained mandibular overdentures: A 1-year prospective clinical study " 34 with alpha error probability of 0.05, 1-beta error probability , power of 0.8 and drop out ratio 5%.

The inclusion criteria will be patients with completely edentulous lower ridges and fully dentate or partially dentate maxillary arch restored with fixed restoration, exhibiting enough inter-arch space to allow for prosthetic rehabilitation with lower implant-retained overdentures and have good oral hygiene and motivation. The excluded patients will be patients with major systemic diseases that may affect osseointegration as uncontrolled diabetes mellitus, pregnancy, patients under bisphosphonate treatment.

The patients will make a complete oral and radiographic examination before inclusion in this study.

For allocation concealment, one of the postgraduate students who will be the only one to know the key so that the authors and the patients won't know in which group the patient will be. Afterwards, the authors will be informed by the randomization to be tabulated.