Does the surgery of the jawbone cure the sleep apnea ?

Depends: Many reasons for sleep apnea. If the jawbone causes the apnea then yes. If there is morbid obesity or thickening of soft palate etc that would need to be addressed too. Ask your head and neck surgeon about your specific situation.

Possibly: A lower jaw advancement will advance the base of the tongue, opening the airway behind it. Depending on the circumstance and the amount of advancement, there could be enough improvement to no longer need the CPAP machine. The problem: requires upper jaw advancement as well to keep teeth in correct position and may not overcome other airway issues related to obesity. Best to reduce weight 1st.

Sleep apnea: Not necessarily. You may overweight or have large tonsils which can cause sleep apnea.

It can: It can if the area of the obstruction is opened with the corrective surgery. Jaw advancement surgery has the highest success rate of any OSA surgery.