Two injections using short needle and dental syringe will be given , the first injection is 1.5 ml out of 1.8 ml of 4% articaine with 1:100,000 epinephrine (ARTINIBSA 4% 1:100,000) in the mucobuccal fold adjacent to the mandibular first Molar, the second injection is 0.3 ml in the lingual side for lingual soft and hard tissues .

Operator will record the LA as Successful if the scheduled restorative treatment was completed with standard treatment management strategies after administration of the trial anaesthetic. If treatment could not be continued after 10 minutes from when the LA was first administered, and the full 1.8 ml cartridge of the trial anaesthetic had been used, then the LA was considered unsuccessful

Doaa Moustafa: he patient's behavior will be evaluated for pain perception during treatment using the SEM scale (Appendix 3: SEM scale ). The SEM scale is an objective pain [10:04 pm, 31/3/2024] Doaa Moustafa: assessment scale with scores ranging from 1 to 4, illustrating comfort to severe discomfort based on sounds, eye, motor parameters