Laser Verses Conventional Circumferential Supracrestal Fiberotomy in Orthodontic Extrusion for Crown Lengthening

Parallel groups, two arm, superiority Randomized Controlled Clinical Trial, with 1:1 allocation. PICO: Population: patients with endodontically treated teeth and short clinical crown that require crown lengthening in the esthetic zone Intervention: laser fiberotomy with orthodontic extrusion Control: conventional fiberotomy using blade with orthodontic extrusion Outcomes: Primary outcome: Stability of the mount of healthy tooth structure exposed. Secondary outcomes: * Stability of gingival Margin reference. * Stability of the alveolar bone. * Rate of tooth extrusion. * Sulcus depth. * Pain Time: 8 weeks after retention