A Study on the Accuracy of Bridge made by Various Soldering Technics

각종(各種) 랍착법(鑞着法)에 의(依)한 가공의치(架工義齒) 정밀도(精密度)에 관(關)한 실험적(實驗的) 연구(硏究)

To compare on the accuracy of bridge made by various soldering technics, four unit bridges were made on a blass original model. They were soldered to each other in the following three ways : In Group I, one central gap between two pieces of pre-soldered abutments and adjacent pontics were soldered at the final step. In Group II, the two gaps between one piece of pre-soldered pontics and two abutments were soldered at the final step. In Group III. the three gaps between two abutments and two ponitcs were soldered at the same time. Misfitting of those bridges were compared by measuring the spaces created between the retainer margins and the shoulders of preparated original model with a micrometer microscope. The author obtained following results : In the final step, the more number of the soldered gap increased, the more accuracy of the bridge decreased.