It's all too common to see people using momentum or half reps when bicep curling.
Partial reps can have a place in a workout.
However, if you're doing it all the time..
That's not partials, that's ego lifting.
The deadstop variation can be an ego killer if you're not used to it as a lighter than normal weight will be required.
However, I've seen people improve their arms by lifting that little bit lighter and going for a greater range of motion.
This is my, mostly, Personal Trainer musings and information which I hope you'll find helpful!