A study on the relationship between ceramo-metal bondstrength and ceramic firing temperature - research publication. Dr A Shibu*, Reader, Prof. Dr. Naidu E. Munirathnam**, Principal and Head, Dr. Annapoorni H.**, Professor, Dr. Nair K. Chandrasekharan***, Professor * Sri Hasanamba Dental College and Hospital, Karnataka. ** Department Prosthodontics, Meenakshi Ammal Dental College, Chennai. *** AECS Maaruti Dental College, Bangalore. Abstract To find out the relationship between the ceramic firing temperature and the ceramo metal bond strength using different temperatures other than the one specified by the manufacturer. 54 specimens of dimension 10 x 10 x 2mm were prepared in nickel-chromium alloy and opaque ceramic was fired on to it. Three different ceramics viz Vita VMK-95, d-SIGN and Noritake super porcelain EX-3 were used. The specimens were grouped into three. In group- I specimens the opaque was fired according to manufacture.s instruction. In group-II specimens the firing temperature was increased by 10°C and in group-III the firing temperature was decreased by 10°C. To find out the role of firing temperature on the ceramo-metal bond strength, the specimens were subjected to three point loading using an Instron universal testing machine. Concluded that the firing temperature specified by the manufactures. of three ceramics namely Vita VMK-95, d-SIGN and Noritake super porcelain EX-3, provide optimum ceramo-metal bond strength. Any change made in the firing temperature by way of increasing or decreasing by 10°C will generally decrease the bond strength. However the effect of temperature variation was negligible with Vita VMK-95. The highest bond strength value of 73.055 MPa obtained from group-I specimens of Vita VMK-95 and the lowest value 30.7233 MPa obtained group-III specimens of d-SIGN are well above the ISO specified value of 25 MPa. This clearly indicates that if the temperature variation is effected with in a range of 10°C the bond strength values will not be altered to clinically unacceptable levels. Top Keywords Ceramo-metal bond, PFM bond failure, Ceramic firing temperature. Top |