The aim of this randomised control trial is to compare the effect of wound lavage using 2.5% Ca(OCl)₂ and 2.5% NaOCl on the outcome of partial pulpotomy in mature permanent mandibular molars with symptomatic irreversible pulpitis (SIP).Primary objective is to evaluate and compare clinical and radiographic outcome of partial pulpotomy following use of 2.5% Ca(OCl)₂ and 2.5% NaOCl in mature permanent mandibular molars with symptomatic irreversible pulpitis.secondary objective is to evaluate OHRQoL and pain experience after use of 2.5% Ca(OCl)₂ and 2.5% NaOCl during partial pulpotomy in permanent mandibular molars with clinical signs indicative of symptomatic irreversible pulpitis.