Correlation Between Vitamin D Serum Level and Early Implant Failure

The goal of this observational study is to investigate relation between serum vitamin D levels and early implant failure. in all patient seeking delayed dental implant placement at Faculty of Dentistry, Ain Shams University from September 2020 to April 2023, all the patients must fulfil the inclusion criteria including age above 18, no medical condition interference and compliance to study. The main question\[s\] it aims to answer are: * is vitamin D deficiency caustic to early implant failure * can implant stability indicate implant failure Participants will receive implants and prosthetic rehabilitated according to each case.