Comparison of Piezoelectric Split-crest Technique Versus Expansion Using Hand Driven Ridge Expanders in Treatment of Maxillary Narrow Ridges

Inclusion Criteria: * Participants are free from any systemic diseases. * Participant have missing one or two premolars or molars with sufficient alveolar ridge height and insufficient alveolar ridge buccolingual (BL) width that interfere with conventional straight forward implant placement. * The minimum BL ridge width included in the study will be 3.5 mm to facilitate ridge splitting and expansion Exclusion Criteria: * Patients with residual infections in the edentulous areas. * Medically compromised groups. * Smokers and patients with poor oral hygiene.