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Discrepancies in marginal and internal fits for different metal and alumina infrastructures cemented on implant abutments
Author(s) -
Faot Fernanda,
Suzuki Dalton,
Senna Plinio M.,
Silva Wander J.,
Mattias Sartori Ivete A.
Publication year - 2015
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12181
Subject(s) - materials science , abutment , chromium , titanium , molybdenum , implant , dentistry , nichrome , metallurgy , medicine , surgery , civil engineering , engineering
Cemented crowns are increasingly being used on dental implants instead of on screw‐retained prostheses because of the reliability of internal Morse taper implant–abutment connections. However, there is a lack of information on the fit of metal ceramic and premachined alumina infrastructures. Therefore, the aim of this study was to evaluate the marginal and internal fits of different metal and alumina infrastructures cemented on universal post abutments. A total of 45 abutments (6 mm in height and 3.3 mm in diameter) were divided into five groups on the basis of their infrastructure material: cobalt–chromium (CoCr), nickel–chromium (NiCr), nickel–chromium–molybdenum–titanium (NiCrMoTi), gold (Au), and premachined alumina. The alumina group showed marginal overextension, and the Au group showed the highest discrepancy in marginal fit among the metal alloys. The CoCr and alumina groups showed the lowest discrepancies in internal fit. In conclusion, the alumina cylinders exhibited the best internal fit, despite their horizontal overextension. Among the metal alloys, CoCr exhibited the best fit at critical regions, such as the cervical and occlusal areas.