Comparison Between Two Different Healing Abutments in Single Posterior Implants

Inclusion Criteria: * Adult patients who are classified as ASA I or II physical status and require mandibular single implants (single missing mandibular posterior teeth) with: 1. Proper bone height and width. 2. Adequate zone of keratinized tissue (at least 2 mm) Exclusion Criteria: * Any systematic disease as uncontrolled diabetes mellitus or metabolic bone diseases * Pregnancy and Lactation * A history of head and neck radiation treatment. * Chronic periodontal diseases. * Poor oral hygiene (Silness-Löe plaque index score 2 and 3) * Parafunctional habits.