ABSTRACT
Statement of Problem: Two potential problems commonly identified with a denture base incorporating a resilient liner are failure of the bond between acrylic resin and soft liner material, and loss of resiliency of the soft liner over time. Since patients may drink different beverages, it is important to evaluate their effects on physical properties of soft lining materials
Purpose: The objective of this in vitro study was to evaluate the effect of different beverages on the hardness of two temporary acrylic-based soft lining materials and their bond strength to the denture base resin
Materials and Method: For the hardness test; a total of 80 rectangular specimens [40mm×10mm×3mm] were fabricated from a heat-polymerized polymethylmethacrylate
Two commercially auto-polymerized acrylic resin-based resilient liners; Coe-Soft and Visco-gel were prepared according to the manufacturers' instructions and applied on the specimens. For the tensile test, 160 cylindrical specimens [30mm×10mm] were prepared
The liners were added between specimens with a thickness of 3 mm. The specimens of both soft liners were divided into 4 groups [n=10] and immersed in distilled water as the control group, Coca-Cola, 8% and 50% ethanol. All groups were stored in separate containers at 37oC for 12 days. All beverages were changed daily. The hardness was determined using a Shore A durometer and tensile bond strength was determined in a ZwickRoell testing machine at a cross-head speed of 5mm/min. The results were analyzed using two-way ANOVA
Results: There was no significant interaction between the soft liners and the drinks for both hardness [p= 0.748] and bond strength [p= 0.902]. There were statistically significant differences between all drinks for both hardness [p< 0.001] and bond strength [p< 0.05]
Conclusion: Within the limitations of this study, it seems that drinking Coca-Cola and alcoholic beverages would not be potentially causing any problems for the temporary acrylic soft liners
ABSTRACT
To assess the effectiveness of acupressure [acupuncture without needle] and synergism of acupoints in reducing and maintaining patient's anxiety before abdominal surgeries. Participants in this randomized controlled trial were 70 patients who were scheduled to undergo abdominal surgery. Patients were randomized to an acupressure group or a placebo group, received acupressure either at the right points or at sham points for 10 mins. Anxiety [recorded on a Visual Analog Scale [0-10]] measured before, following pressure application and 30 minutes after intervention in both groups. The anxiety decreased in both group following pressure application for 10 min [P<0.001], but these effect sustained 30 mins after intervention only in acupressure group [P<0.001] not in placebo group. Comparison anxiety in following pressure application and 30 mins after intervention between groups was significant. Acupressure at the Yintang and Shen men points can decrease the anxiety level in patients before abdominal surgeries and sustained lower for 30 mins