This clinical trial aims to compare two drilling protocols Underdrilling and Osseodensification for placing dental implants in patients with low bone density. The purpose is to compare which technique provides better primary and secondary implant stability in the posterior regions of the jaw with low bone density. The hypothesis is that there is no significant difference in implant stability between the two protocols.

Achieving sufficient primary stability becomes difficult in areas with low bone density. One technique commonly used is Underdrilling protocol.With the Underdrilling technique, the final osteotomy is smaller than the diameter of the implant to be placed.A relatively new Osseodensification protocol, introduced by Huwais in 2013, employs specially designed bur that smoothly compact the bone as they expand an osteotomy. This may prove to be particularly helpful in cases with low bone quality.This clinical trial aims to compare the implant stability using these drilling protocols

Inclusion Criteria:

1. Patient partially edentulous ridge after extraction of more than 6 months and with low bone density.
2. Systemically healthy patients ≥18 years of age.

Exclusion Criteria:

1. Smokers.
2. Pregnant or lactating females.
3. Uncontrolled systemic disease like diabetes, hypertension, hormonal therapy and hematologic diseases.
4. History of Maxillary sinus pathology.

Double blinding will be performed. The patient, the outcome assessor and data analyst will be blinded to the allocation