Alvarez Angel, Lafita Pedro, de Llanos Hector, Gago Angel, Brizuela Aritza, Ellacuria Joseba J
Department of Prosthodontics and Occlusion, School of Dentistry, University of Oviedo, Oviedo, Spain.
J Prosthodont. 2014 Feb;23(2):163-70. doi: 10.1111/jopr.12083. Epub 2013 Jul 26.
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.
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.
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.
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.
本研究旨在测量并比较用于将杆焊接到杆固位、种植体支持的覆盖义齿上的焊接方法（火焰焊接或烤瓷炉焊接）对杆金圆柱体与种植体龈上基台之间适配性的影响。
制作32个覆盖义齿种植杆，并用螺丝固定到两根连接在牛肋骨上的Bränemark种植体上。这些杆被随机分为两组：火焰焊接组和烤瓷炉焊接组。然后使用火焰和烤瓷炉对所有杆进行切割和焊接。在杆焊接前后，用光学显微镜在与螺丝拧紧侧相对的一侧测量杆金圆柱体与种植体龈上基台之间的适配性。对获得的数据进行配对和独立数据的统计处理。
所有杆在焊接前的平均不匹配度为33.83至54.04μm。在对杆进行切割和焊接后，不匹配度增加到71.74至78.79μm的范围。在焊接过程前后，与使用烤瓷炉焊接的杆相比，使用火焰焊接的杆显示出更高的不匹配度。在焊接过程后，使用烤瓷炉焊接的杆的左侧不匹配度略低。
根据我们的数据，使用火焰或烤瓷炉焊接技术焊接杆并不能改善一体式铸造杆在两个种植体上的不匹配度。使用烤瓷炉焊接技术获得的不匹配度较低。
