Showing 4 results for Gerami Panah
F. Gerami Panah , Haghpanahi, Zargarani,
Volume 9, Issue 1 (8 1996)
Abstract
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EN-US
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AR-SA In this research, by using limited elements,
distribution of tensions in mesial and distal rests on root surfaces of
abutment teeth of removable partial dentures was studied. First mandibular
premolar was divided into 48 triangular elements. mastication force and thickness of covering tissue were
considered 30 pounds and 2.5 mm respectively. During the movements toward the
tissue, the tension on abutment teeth with mesial rests was lower and more
uniform in comparison to distal rests.
A. Fazel , F. Gerami Panah , S. Zaratti ,
Volume 13, Issue 1 (6 2000)
Abstract
Preservation of bone-implant interface is vital for maintaining of implant treatment. There are some cases in which crown to fixture ratio is increased due to loss of residual ridge. In this condition knowledge of stresses acting over alveolar bone is important in regard to prognosis of treatment. In this study three different crown to fixture ratios evaluated under lateral forces considering stresses generated in the alveolar bone around the implant.Three different models of crown to implant ratios were designed in a single-tooth implant at anterior maxilla.Model No. 1 with ratio of 1:1, model No. 2 (1.5:1) and model No. 3 (2:1) were designed. Then, the differences between stresses under two horizontal loads (70 and 100 Newton) were analyzed by three-dimensional finite element analysis. Principal normal stresses and Vonmises stress were measured in this study.Results indicated that stress concentration were mainly at the crestal bone.Highest stresses were obtained in third model (2:1 ratio), which was approximately twice as first model (1:1) ratio.
F. Gerami Panah , M. Haghpanahi,
Volume 13, Issue 2 (7 2000)
Abstract
F. Gerami Panah ,
Volume 14, Issue 1 (9 2001)
Abstract
The formation of oxides on the surface of the metal are proven to contribute to the formation of strong bonding. However, The base metal alloys are expected to exhibit more oxidation than high gold alloys, increase in oxide layer thickness due to repeated firing in them can reduce the bond strength. The aim of this study was to compare the effect of repeated porcelain firing on the bond strength of two base metal alloys (Minalux and Verabond II). Sixteen metal plates (20x5x0.5) from each alloy were cast and prepared according to the manufacturers' instruction. Porcelain with uniform thickness (Imm) was applied on the middle one third of metal plates. After this stage, each alloy group divided to three subgroups. Group I was fired for the second time to form the final glaze, group II and III were fired two and four more times respectively. Specimens were subjected to 3-point flexural test in a digital tritest machine. Results showed no significant differences between bond strength of two alloys. Also results showed repeated firing had no significant effect on bond strength. Due to these findings, this study support similarity of two alloys (Minalux and Verabond II) in their bond strength with porcelain.
