Generation of retentive force by electroformed telescope crowns

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This study was performed to clarify the mechanism of generating retentive force in the electroformed telescope crown. The inner crowns were made of gold alloy with 0゜, 2゜, 4゜ and 6゜ taper and five outer crowns were made by electroforming on the inner crown. We measured the retentive force and the negative pressure generated between the inner and outer crowns with glycerin solution of different viscosity instead of saliva during removal of the outer crown of the electroformed telescope in order to evaluate the relation between retentive force, negative pressure and the viscosity of saliva. The peak retentive force was significantly greater at glycerin concentration of 20% or greater, when compared with no solution. The increase in maximum negative pressure was greater at 0゜ and 2゜ than at 4゜ and 6゜, and greater increases were observed with glycerin concentrations of 60% and 80% compared with lower concentrations. At 2゜, the retentive force did not increase significantly as the concentration increased when holes were present in the outer crowns. However, when there were no holes, significant increases in the peak retentive force were observed at 60% and 80% glycerin concentration compared with no solution. The above findings suggest that the viscosity of saliva and the negative pressure generated between the inner and outer crowns increases the retentive force effectively in a 2゜ tapered electroformed telescope.
大阪歯科学会の論文

Generation of retentive force by electroformed telescope crowns

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