TY  - JOUR
  - McKenna J, Ray N, McKenna G, Burke FM
  - 2011
  - November
  - International Journal of Dentistry
  - The effect of variability in the powder/liquid ratio on the strength of zinc phosphate cement
  - Published
  - ()
  - 2011
  - 679315
  - 1
  - 4
  - Aim:  To investigate (a) variability in powder/liquid proportioning (b) effect of the extremes of any such variability on diametral tensile strength (DTS), in a commercial zinc phosphate cement. Statistical analyses (a = 0.05) were by Student¿s t-test in the case of powder/liquid ratio and one-way ANOVA and Tukey HSD for for pair-wise comparisons of mean DTS. The Null hypotheses were that (a) the powder-liquid mixing ratios observed would not differ from the manufacturer¿s recommended ratio (b) DTS of the set cement samples using the extreme powder/liquid ratios observed would not differ from those made using the manufacturer¿s recommended ratio.Methodology:  Thirty-four undergraduate dental students dispensed the components according to the manufacturer¿s instructions. The maximum and minimum powder/liquid ratios (m/m), together with the manufacturer¿s recommended ratio (m/m), were used to prepare cylindrical samples (n = 3 x 34) for DTS testing. Results:  Powder/liquid ratios ranged from 2.386 to 1.018.The mean ratio (1.644 (341) m/m) was not significantly different from the manufacturer¿s recommended value of 1.718 (p=0.189). DTS values for the maximum and minimum ratios (m/m), respectively, were both significantly different from each other (p<0.001) and from the mean value obtained from the manufacturer¿s recommended ratio (m/m) (p<0.001).Conclusions:  Variability exists in powder/liquid ratio (m/m) for hand dispensed zinc phosphate cement. This variability can affect the DTS of the set material.
DA  - 2011/11
ER  - 

@article{V110097449,
   = {McKenna J,  Ray N and  McKenna G,  Burke FM },
   = {2011},
   = {November},
   = {International Journal of Dentistry},
   = {The effect of variability in the powder/liquid ratio on the strength of zinc phosphate cement},
   = {Published},
   = {()},
   = {2011},
   = {679315},
  pages = {1--4},
   = {{Aim:  To investigate (a) variability in powder/liquid proportioning (b) effect of the extremes of any such variability on diametral tensile strength (DTS), in a commercial zinc phosphate cement. Statistical analyses (a = 0.05) were by Student¿s t-test in the case of powder/liquid ratio and one-way ANOVA and Tukey HSD for for pair-wise comparisons of mean DTS. The Null hypotheses were that (a) the powder-liquid mixing ratios observed would not differ from the manufacturer¿s recommended ratio (b) DTS of the set cement samples using the extreme powder/liquid ratios observed would not differ from those made using the manufacturer¿s recommended ratio.Methodology:  Thirty-four undergraduate dental students dispensed the components according to the manufacturer¿s instructions. The maximum and minimum powder/liquid ratios (m/m), together with the manufacturer¿s recommended ratio (m/m), were used to prepare cylindrical samples (n = 3 x 34) for DTS testing. Results:  Powder/liquid ratios ranged from 2.386 to 1.018.The mean ratio (1.644 (341) m/m) was not significantly different from the manufacturer¿s recommended value of 1.718 (p=0.189). DTS values for the maximum and minimum ratios (m/m), respectively, were both significantly different from each other (p<0.001) and from the mean value obtained from the manufacturer¿s recommended ratio (m/m) (p<0.001).Conclusions:  Variability exists in powder/liquid ratio (m/m) for hand dispensed zinc phosphate cement. This variability can affect the DTS of the set material.}},
  source = {IRIS}
}