2017 Volume 30 Issue 2 Pages 102-110
The aim of this clinical study was to evaluate the technical complications of implant-supported single crowns at Tsurumi University Hospital. The patients who received implant-supported single crowns from January 2004 to April 2014 received follow-up examinations and evaluations of technical complications. The patients attended at least once a year, and all crowns functioned for more than 1 year. A total of 536 implant-supported single crowns were examined with regard to the location, type of implant, type of connection, and time of failure event. The results were as follows : 1. Technical complications were observed in 15% of crowns after placement ; 2. Screw loosening was the most frequent complication, followed by fracture or chipping of facing material ; 3. 75% of screw loosening occurred within 1 year after placement ; 4. Most fractures or chippings of facing materials were observed in screw-retained crowns placed in the molar region.
