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Background: We performed maxillary sinus floor augmentation using the crestal approach and beta-tricalcium phosphate (β-TCP) and a long-term evaluation using cone-beam computed tomography (CBCT). Methods: Twenty-three patients (30 implants) underwent sinus floor augmentation using the osteotome technique. Subjects underwent CBCT imaging before surgery, immediately after surgery, and at follow-up (≥ 3 years after surgery). We measured the changes in height of the augmented sinus floor (SL), the augmented bone above apex of the implant (BH), and the implant length that projected into the sinus (IL). Results: The mean SL decreased from 6.54 ± 1.51 (immediately after surgery) to 3.11 ± 1.35 mm (follow-up). The mean BH decreased from 3.17 ± 0.97 to − 0.25 ± 1.19 mm; the maxillary sinus floor in many implants was near the apex at follow-up. The SL at follow-up showed a strong correlation with the IL (p = 0.0057). Conclusions: Osteotome sinus floor elevation with beta-tricalcium phosphate was clinically effective. Cone-beam computed tomography analysis revealed that ≥ 3 years after surgery, the maxillary sinus floor was near the apex of the implant.

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, 158 accident reports were submitted from 35 staffers of the nutrient Department in Showa Hospital. We analysed the causes of accidents with the aim of preventing future accidents. It was found 90 cases were attributable to errors in paperwork (57%), 56 cases dul to waiting errors (35%), eight cases to foreign body contamination (5%), and four cases to other resons (3%).Most accidents occurred by lack of confirmation, and it seemed that thoroughness of affirmation such as repetitive affirmation by a plural number of staffers prevent accidents. We should feed back both contents and causes of these accidents to all the employees, and should make a new guideline for accident prevention.