Immediate vs Delayed Loading of Two Implants Supporting a Mandibular Over Denture

Inclusion Criteria: * Males and females at least \>=21y of age * Provision of informed consent * Totally edentulous arch requiring or wearing mandibular complete denture * Tooth in implant sites must have been extracted at least 4 months before the implant placement. * Adequate amount of bone support to insert a 8mm in length and 4mm in diameter implant without encroaching on vital structures. The amount of bone available should be such that after implant placement there should be minimum of 1mm lingual and buccal bone * Implant insertion torque \>=20Ncm * No need for bone augmentation procedures Exclusion Criteria: * Conditions or circumstances as evaluated by the investigator, which would prevent completion of study participation. * Conditions requiring chronic routine use of antibiotics or requiring prolonged use of steroids. * History of leukocyte dysfunction or deficiencies, bleeding disorders, neoplastic disease requiring radiation or chemotherapy, metabolic bone disorder, uncontrolled endocrine disorders, HIV infection * Use of investigational drugs or devices within 30 days of study period, * Alcoholism or drug abuse and heavy smokers \> 10 cigarettes a day. * Local factors such as * untreated periodontitis, * erosive lichen planus, * local irradiation history, * osseous lesion, * unhealed extraction socket, * intraoral infection, * lack of primary stability * inadequate oral hygiene * Simultaneous participation in another clinical study