[Analysis of the unsuccessful cases of the porcelain-fused-to-metal-crowns and bridges].
OBJECTIVE
To discuss the unsuccessful reasons and the preventive methods of the unsuccessful clinic cases.


METHODS
The retrospective analysis was carried on the 80 prosthesis in 70 patients from 1994 to 2001 which were suffered with unsuccessful results after the restoration of the metal crowns and bridges.


RESULTS
There were 68 teeth which had collapsed or broken. 20 teeth had the post loosing or shedding. Root breaking, food impaction, unharmony colors of porcelain and the changing color of gingival were 3, 3, 6 and 2 teeth.


CONCLUSIONS
It is necessary to select suitable repairing materials and operate correctly for preventing the occurring of the unsuccessful results in the porcelain-fused-to-metal-crowns and bridges.
Zhai
Li-Yun
LY
Dept. of Prosthodontics, Tianjin Oral Hospital, Tianjin 30041, China.
Zhao
Yu-Zhen
YZ
Wang
Shao-Ping
SP
Yang
Yue-Hua
YH
D003442:Crowns; D003776:Dental Porcelain; D006801:Humans; D008670:Metals; D008963:Molar; D012189:Retrospective Studies; D014092:Tooth Root
D008670:Metals; D003776:Dental Porcelain