Riham Karam Mohammed Ahmed, Nihal Ezzat Sabet And Shaimaa Ismail Gawdat,

ABSTRACT
Objective: The Objective Of The Study Was To Evaluate The Effect Of Occlusal Reduction On Postoperative Pain After Both Root Canal Instrumentation And Obturation. Subject And Methods: Forty-four Participants Having Posterior Mandibular Teeth With Symptomatic Irreversible Pulpitis And Symptomatic Apical Periodontitis Were Included In This Study. After Confirming The Diagnosis, Patients Were Randomly Assigned Into Two Equal Groups. For The Intervention Group, All The Occlusal Contacts Of The Functional And Non-functional Cusps As Well As On The Marginal Ridges Of The Tooth Were Relieved From Occlusion While No Modification Was Done For The Occlusal Surface For Control Group. The Root Canal Treatment Was Done In Two Visits. Root Canals Were Prepared Using Revo-S Rotary System And Obturation Was Done Using Modified Single Cone Technique With Resin Sealer. In This Study, Modified Visual Analogue Scale (VAS) Was Used To Assess Pain Pre-operatively And At 6, 12, 24 And 48 Hours After Root Canal Instrumentation And At 6 And 12 Hours After Root Canal Obturation. Patients Were Given A Placebo To Be Administrated In Case Of Emergency And An Analgesic Was Prescribed In Case Of Persistent Pain. All Demographic Data, Modified VAS Scores, Placebo And Analgesic Intake Were Tabulated And Statistically Analyzed.

Results: Results Showed That, The Incidence Of Pain At All Follow Up Periods Showed No Statistical Significant Difference Between The Two Groups (P>0.05). The Difference In The Mean Scores Of Pain Intensity Showed Statistically Significant Decrease At 12 Hours Post-instrumentation In Occlusal Reduction Group. On The Other Hand, There Was No Statistically Significant Difference Between The Two Groups At All Other Observational Periods. The Incidence Of Post-instrumentation Analgesic Intake Showed A Statistically Significant Increase In Non-occlusal Reduction Group. Conclusion: Within The Limitations Of This Study, It Could Be Concluded That: The Occlusal Reduction Was Associated With Significant Reduction Of Pain Intensity After 12 Hours From The Root Canal Instrumentation Which Proved That The Occlusal Reduction Initiated Faster Healing Than Non-occlusal Reduction.