what does the 'O' in MOD stand for?

[bioshawn]

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Can you please thell me what the 'O' in MOD stands for?
wanted to join the DentalTown, and need your help.
Thanks

 

[ISU_Steve]

Occlusal

 

[bioshawn]

Thanks !!! 🙂

 

[ISU_Steve]

Not a problem.