Flight Instructor reported during taxi the student added excess power and insufficient braking resulting in loss of control and impact of a wing with poles.

Narrative

On Day 0; I was flying with my student pilot in the morning. It was a clear day and I was excited to fly. We completed the preflight and everything looked good. I let my student taxi us to the Run up Area on the ramp. This was his second time doing it (This was only our 4th flight). The Run up was getting closer and I told my student to add 18MP and step hard on the right brake to turn us into a West heading. However; my student added too much power and did not step on the right brake hard enough. The turn was aggressive/abrupt. It happened so fast and a big thud sound happened. At that point I took flight controls and stopped the aircraft. My first thought was that we damaged the nose wheel or popped the tire. I also thought we might have hit the yellow poles that are located on the edge of the pavement. My thought process was first check the nose wheel. So; I added power and advanced forward to see if it seemed stable. It was. Then; I kept replying the event in my head to see if we could have been too close to hit the left wingtip on the yellow poles. My student asked me if we should go look at it. However; I told myself that there was no way we hit the wingtip because I gave my student enough distance. My thought process was; I've been to the Run up area before and I know the distance to turn. This turned into a hazardous attitude of Invulnerability. I talked myself out of believing that we could have hit our wingtip. I thought it was the nose wheel and since I checked it and it was good I proceeded with the flight. I decided not to shut down the engine and look at the wingtip. After our flight; we parked on the ramp in our designated parking spot. My student was putting on the tie down for the left wing when he told me that there was damage and we did hit the yellow poles during our set up for ground check at the Run up. Looking back at this event; it could have been prevented by shutting down the engine and checking the wingtip before we flew. This would have been the safest choice. Telling myself it couldn't have been the wingtip and not looking at the big picture and checking was a contributing factor. I also think being a new flight instructor had an effect on my actions to this. My inexperience to make my own decision and not stopping and thinking that looking at the problem was a pressure. Learning from this event; I know going forward that when you talk yourself out of a reality and takeaway the thoughts of 'I have down this before and the distance to turn was enough' that is not an answer and checking the aircraft and shutting down the engine is the best action.