Clinical Assessment of All Ceramic Single-retainer Using Upper Canine as Abutment With Minimum Preparation on the Lingual Surface, to Replace the Upper Lateral Incisor and Will be Compared With the All Ceramic Single-retainer Using Upper Central Incisor.

Inclusion Criteria: * Patients who have unilateral or bilateral missing upper lateral incisor and need to replace them with the following criteria: * From 14-30 years old and be able to read and sign the informed consent document. * physically and psychologically able to withstand conventional dental procedure * Sound or minimally restored abutment with enough enamel surface area for bonding and no periodontal diseases. * If the patient had previously undergone orthodontic treatment, a stabilization period of at least 3 months before impression taking. * Good oral hygiene. * Able to return for follow-up examinations and evaluation. * No signs and symptoms of bruxism. Exclusion Criteria: * Pregnant women * Increased overbite * Bruxism, clenching or abnormal habits like nail or pencil biting that create occlusal forces * Any developmental anomaly affecting the enamel of upper central incisor or canine * Uncontrolled caries and periodontal disease and uncooperative patients. 6- Medically unfit for dental treatment and follow up.