depends on wether the caries in 47 is invoving d pulp?if it is then rc first and then disimpaction.disimpaction toh kar hi.rc kab karna hai ye depend karta hai uska pain ka reason pe.bt if caries is nt involving pulp d tenderness cud be because of d 3rd molar tryng to erupt which might be pushing onto 47.so then first u will hv to do disimpaction.aisa mujhe lagta hai.