Objectives

To evaluate the dimensional (DC) and mass change (MC) of resin cements of varying composition in different test solutions. The general use of various storage media, particularly distilled water only, suggests that solution osmotic pressure is insignificant in cement behavior.

 

Methods

The role of solution type; distilled water (DW), saline (SA) and saturated salt (SS), silanation; no silanation (NS) and 5% A.174 (5%S), and filler-type; spherical (S1-4µ, S2-9.6µ) and whisker (W1-0.1mm, W2-0.4mm), was evaluated. Each resin cement had 30% filler. Percent DC and percent MC were measured at 7 day intervals over 28 days. A balanced design for three solutions x four materials x two silanation treatments (n = 72 each test) was analyzed ANOVA with p < 0.05. Results: For the silanated materials in SA after 28 days, DC was:

 

 

 

 

 

 

 

 

 

 

 

 

 

For the materials in SA, DC was: S2 = W1 = S1 < W2. For all materials, SS < DW < SA, except S1 in DW vs. SA. Data from other unsilanated materials and solutions, and MC for these conditions, summarized below.

 

Conclusions

Each silanated material showed a statistically different DC as well as MC in each solution, except for S1 in DW compared to SA. Thus, SS < DW < SA. The same pattern was shown for unsilanated materials with unsilanated materials having greater DC and MC values than silanated. Each material showed the lowest DC and MC in SS. S1 generally had the lowest DC or MC, while W2 generally had the highest DC or MC. SA is not only the physiological solution for testing, but also is the most revealing for resin cement behaviors.

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