The effect of low level laser on the depth of anesthesia during treatment of lower mandibular molar r with irreversible pulpitis teeth

INTERVENTION: Contorol group: keeping the low level laser on the buccal of teeth but not turn on the laser and use laser in the off mode. Intervention 1: Intervention group: usage of low level laser on the buccal of teeth and use the laser in the on mode. Intervention 2: Contorol group: keeping the low level laser on the buccal of teeth but not turn on the laser and use laser in the off mode. Intervention group: usage of low level laser on the buccal of teeth and use the laser in the on mode. Placebo Treatment ‐ Other CONDITION: Irreversible Pulpitis. ; Pulpitis Pulpitis PRIMARY OUTCOME: Pain. Timepoint: Before laser irradiation and during dentin and pulp exposure. Method of measurement: Visual Analog Scale. INCLUSION CRITERIA: INCLUSION CRITERIA: irreversible pulpitis in lower molar teeth, understanding of testimonial, accessibility to patient, age at least 18 years old. Exclusion criteria: history of systemic diseases, heart disease, diabetes, cancer, psychological problem, use of antibiotic and analgesic, malocclusion, lesion in mouth.