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A Comparison of Two Soldering Techniques on the Misfit of Bar‐Retained Implant‐Supported Overdentures
Author(s) -
Alvarez Angel,
Lafita Pedro,
Llanos Hector,
Gago Angel,
Brizuela Aritza,
Ellacuria Joseba J.
Publication year - 2014
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12083
Subject(s) - soldering , materials science , torch , bar (unit) , ceramic , wave soldering , metallurgy , dip soldering , abutment , composite material , engineering , structural engineering , physics , welding , meteorology
Purpose This study was conducted to measure and compare the effect of the soldering method (torch soldering or ceramic furnace soldering) used for soldering bars to bar‐retained, implant‐supported overdentures on the fit between the bar gold cylinder and implant transgingival abutment. Materials and Methods Thirty‐two overdenture implant bars were manufactured and screw retained into two Bränemark implants, which were attached to a cow rib. The bars were randomly distributed in two groups: a torch‐soldering group and a porcelain‐furnace soldering group. Then all bars were cut and soldered using a torch and a ceramic furnace. The fit between the bar gold cylinders and implant transgingival abutments was measured with a light microscope on the opposite side to the screw tightening side before and after the bar soldering procedure. The data obtained were statistically processed for paired and independent data. Results The average misfit for all bars before soldering was 33.83 to 54.04 μm. After cutting and soldering the bars, the misfit increased up to a range of 71.74 to 78.79 μm. Both before and after the soldering procedure, the bars soldered using a torch showed a higher misfit when compared to the bars soldered using a porcelain furnace. After the soldering procedure, the misfit was slightly lower on the left side of the bars, which had been soldered using a ceramic furnace. Conclusions According to our data, the soldering of bars using the torch or furnace oven soldering techniques does not improve the misfit of one‐piece cast bars on two implants. The lower misfit was obtained using the porcelain furnace soldering technique.