Acrylic resins used in the fabrication of dentures should not absorb much water, since water sorption reduces strength. The article "Reinforcement of Acıylic Resin for Provisional Fixed Restorations. Part III: Effects of Addition of Titania and Zirconia Mixtures on Some Mechanical and Physical Properties" (W. Panyayong, Y. Oshida, et al., Bio-Medical Materials and Engineering, 2002:353-366) describes a study of the effect on water sorption of adding titanium dioxide (TiO,) and zirconium dioxide (ZiO,) to a standard acıylic resin. Twelve specimens from each of several formulations, containing various amounts of TiO, and Zro, were immersed in water for one week, and the water sorption (in ug/mm?) was measured in each. The results are presented in the following table. Volume % Formulation TIO, Zro, Mean A (control) Standard Deviation 24.03 2.50 14.88 1.55 2 12.81 1.08 0.5 11.21 2.98 2 16.05 1.66 12.87 0.96 15.23 0.97 Н 3 15.37 0.64 Use the Bonferoni method to determine which of the noncontrol formulations (B through H) differ, at the 5% level, in their mean water sorption from the control formulation A. a. b. Repeat part (a) using the Tukey-Kramer method. Which method is more powerful for these comparisons? Why? C.

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