This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'You have a patient who has a large number of cervical restorations made of resin-modified glass ionomer. The patient’s restorations and teeth were recently cleaned with an ultrasonic scaler. What should you be concerned about? \nSelect and explain. \nA. Tooth cement adhesion issue, B. Biofilm formation, C. Exposure of dentinal tubules, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The creation of a rough restoration surface by abrasion, erosion, air polishing, or ultrasonic instrumentation has been associated with increased biofilm formation. The restorations could be repolished or coated with a surface sealant (liquid polish) to rectify the roughening of the surfaces. The restorations should be monitored periodically because clinical studies have not clearly demonstrated that fluoride- releasing dental biomaterials significantly reduce the incidence of secondary caries, and because secondary caries most commonly occur at the gingival margin of restorations.', 'role': 'assistant'}]