A dentist prepares Class II restorations on two adjacent posterior teeth simultaneously. The most likely complication is:

Correct answer: D. Open contact

• A. Hyperocclusion (a high restoration) is an occlusal error not specific to restoring adjacent contacts at once.
• B. Hypoocclusion (under-contoured occlusal surface) is not the characteristic adjacent-restoration problem.
• C. Tight contact is the opposite of the usual error; matrices tend to leave too little, not too much, contact.
• D. Correct. Restoring two adjoining proximal surfaces together makes it hard to establish a proper contact, frequently producing an open (deficient) contact and food impaction.