Effect of Cryotherapy on Postoperative Pain for Pulpotomy

The goal of this clinical trial is to investigate the effect of cryotherapy on post-operative pain for pulpotomny in permanent mature carious posterior teeth with symptomatic irreversible pulpitis. The main question is: Do cryotherapy reduce post-operative pain and improve QoL in interested samples? \[primary hypothesis or outcome measure 1\] Post-operative pain by Numerical rating scale scores. \[primary hypothesis or outcome measure 2\] QoL of patients by OHIP-14 If there is a comparison group: Researchers will compare pulpotomy incorperated with cryotherapy and without. Participants will scoring VAS scores and OHIP-14 before and after treatment at designated time points.