A Comparison of Retention Between Acetal Resin and Stainless Steel Wrought Wire Retentive Clasp Arms
The objective of this study was to compare the retention of three different groups of acetal resin retentive clasp arm and a group of stainless steel wrought wire retentive clasp arm. The differences in design of acetal resin retentive clasp arms were as follow: group A, 1/3 terminal clasp arm was below a survey line and engaged retentive undercut 0.02” ; group B, 1/3 terminal clasp arm was below a survey line and engaged retentive undercut 0.03” ; group C, 2/3 terminal clasp arm was below a survey line and engaged retentive undercut 0.03” where as group D, stainless steel wrought wire clasp arm engaged retentive undercut 0.02” Tensile load of each clasp arm was performed by a Universal testing machine and the retentive force for group A, B, C, and D were 1.21, 1.67, 1.51, and 6.32 N respectively. One way ANOVA and Dunnett T3 multiple comparison reveal no significant difference in retentive force between group B and C but there were significant differences between these two groups and group A and D at p <0.05.
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