Study to Evaluate Bone and Gum Dimension Changes Around Dental Implants Placed in Different Positions in Bone.

Inclusion Criteria: 1. Subjects must have read, understood and signed an informed consent form; 2. Subjects must be 18 to 70 years of age; 3. Subjects must be able and willing to follow study procedures and instructions; 4. Subjects must have indication to receive two implants in a bilateral maxillary or mandibular edentulous areas (for at least 4 months post extraction) in areas of pre-molars (first or second) and molars (first or second); 5. Sufficient width and height of bone to place at least 8mm length and any compatible in diameter Ankylos implant; 6. Sufficient vertical clearance to place a single tooth crown replacement; 7. No apical disorder/inflammation at the area of the implant site. Exclusion Criteria: 1. Subjects participating in other clinical studies within 1 month prior to screening and/or involving therapeutic intervention (either medical or dental) that could affect bone or soft tissue healing; 2. Female subjects who are pregnant or lactating, or who intend to become pregnant during the study period following entrance into the study; 3. Subjects with parafunctional habits; 4. Subjects who have failed to maintain good plaque control; 5. Subjects with any systemic condition like uncontrolled diabetes mellitus, cancer, HIV, disorders that compromise wound healing, chronic high dose steroid therapy, bone metabolic diseases, radiation or other immuno-suppressive therapy which would preclude periodontal surgery; 6. Absence of occlusal stability in centric occlusion; 7. Subjects with the presence of acute infectious lesions in the areas intended for surgery; 8. History within the last 3 months of weekly or more frequent use of smokeless chewing tobacco, pipe or cigar smoking and cigarette smoking (greater than 10 cigarettes per day) 9. Present alcohol or drug abuse; 10. Angulation requirements of the restoration exceeding approximately 15 degrees; 11. Systemic corticosteroids or any other medication that would compromise post-operative healing and/or osseointegration (e.g. calcium channel blocker, dilantin).