The average life expectancy has been increased, so the proportion of elderly patients that visit to the dental clinic for prosthetic restoration has increased. Elderly patients have various chronic diseases. Recent trends show an increase of osteoporosis in elderly patients, and thus, the number of osteoporosis patients is expected to escalate. Currently, the most widely used drug for osteoporosis is bisphosphonate. However, osteonecrosis of the jaw has been reported as a side effect derived from longterm oral administration or injection treatment of the drug. Surgical dental treatment was the main cause of medication related osteonecrosis of the jaw (MRONJ). As MRONJ is very difficult to cure, it is important to take preventive measures. Surgical operation may be needed for the mouth preparation before prosthetic restoration. For successful treatment, the dentist should have a full understanding of osteoporosis and show a continued interest toward this disease for careful management.

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Prosthetic restorations through implants were popularized, and they became routine treatments. Small accessories used in the implant prosthodontic procedure are more likely to slip or fall off the dentist's hands. If the dental appliance or material passes into the upper gastrointestinal tract, there is a high possibility of excretion to the outside of the body without complications, but serious complications may occur depending on the type of foreign body. If the foreign body is passed to the airway, it is an emergency situation, and if it is not done properly, it can be fatal. The purpose of this review report is to investigate the process of foreign body ingestion or aspiration during dental treatment, and the method of prevention and treatment. (J Dent Rehabil Appl Sci 2018;34(2): 63-71)

Purpose: This study was to investigate the dentists' experience and awareness of foreign body ingestion and aspiration during dental prosthetic treatment. Materials and Methods: A survey of 157 dentists working at 108 dental institutions in Daejeon and Chungcheong provinces was carried out and frequency analysis was conducted. Chi-square test was conducted to find out the difference between the sociodemographic data and experience of foreign body ingestion and aspiration of patients and independent sample t-test was conducted to find out the difference in awareness depending on whether receiving related education. Results: The percentage of dentists experiencing dropping foreign body into patients' oral cavity was 99.4% and the percentage of dentists experiencing foreign body ingestion and aspiration of patients was 53.5%. There were more dentists who experienced foreign body ingestion and aspiration of patients in male than female, longer working career, and general practitioners than specialists (P < .05). 50.3% of the respondents received related education. When they receive related education, they had low degree of concern, high confidence in coping with situations, and low willingness to receive education in the future (P < .05). Conclusion: The percentage of foreign body dropping was 16% higher in prosthetic treatment than general treatment. The percentage of dentists with experience of foreign body ingestion and aspiration of patients was 53.5%. Among them, 92.9% experienced foreign body ingestion of patients and 7.1% of them experienced foreign body aspiration of patients.