Removing previous composite restoration

[DancingKoala]

Hi guys.
I had couple of cases that I had to remove previous fillings and replace them with composites.
If the previous filling was amalgam, it was easy for me to visualize and take it out completely.
However, it was hard for me to distinguish previous composite from natural tooth structure and I don't want to leave it because there might be cavity underneath the filling. I also don't want to overprep thinking that the previous composite is still there.

Is there an easy way to distinguish between composite and natural tooth structure when there is not much color difference?

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[Flipper405]

I would suggest three things
1. Use the explorer and try to feel the texture... the composite will feel "scratchy" whereas the tooth will feel smooth
2. Also make sure to use your air syringe to dry everything out and the composite will become more visible.
3. Use a headlight/loupes so you can see more clearly

 

[GrillSkillz]

Around enamel, go by feel. The drill will cut through composite like butter, where enamel is much harder. Below the DEJ, go by color - the yellow color of dentin should be easy to distinguish from the restorative material.

If you're really scared, you can use a white finishing stone/bur when u get close to tooth structure. It will slowly remove the composite without removing enamel.

 

[lemoncurry]

If you use a slow speed round bur, you have much less chance of removing excess tooth structure but it will remove restorative materials. Use the biggest round bur you can fit.