Surgery Over filling may force materials directly in to the maxillary sinus most frequently in the case of: A Maxillary second premolar B Maxillary first premolar C Maxillary first molar D Facial root maxillary first premolar 💡 Explanation Over filling may force materials directly in to the maxillary sinus most frequently in the case of: ✓ Correct Answer: C. Maxillary first molar