[Shiau-ROC TAIWAN-P-1] Evaluation of pressure generated by different tray design using digital occlusion analyzer device: An in vitro study
[Abstract]
[Objective]
This in vitro study aimed to evaluate the pressure generated by various tray designs during impression making. The null hypothesis was that no differences would be found in the pressure depending on the variations in tray relief and vent hole design.
[Method]
A specialized testing device was fabricated to measure a pressure. A digital occlusion analyzer device (T-scan, Tekscan Incorporation) was used to quantify and visualize the applied pressure. Three trays were designed to fit the sensor size of the device. Each tray was divided in half to feature different amounts of relief on each side; the contol group with 0.5mm relief, and the experimental groups with reliefs of 1 mm, 2 mm, and 3 mm. Additionally, three other trays were designed with varying vent hole designs on the experimental side; the control group has no vent hole, while the experimental groups varied in vent hole size and number. The relative pressure of each side was measured. Two types of polyvinyl siloxane impression materials (A, B) were used. Kruskal-Wallis test was used to evaluate the effect of relief amount and vent hole design.
[Results and Discussion]
A significant difference in relative pressure was found between the relief amounts of 2 mm and 3 mm when using impression material A. With impression material B, there were significant difference in relative pressure across all combinations of relief amounts. In terms of the relative pressure based on the size and the number of vent holes, a statistically significant differences were found among the three groups. The pressure generated during impression making was affected by by the type of impression material and tray design. The efficacy of different techniques for selective pressure application can vary depending on the impression material used. Using multiple small-sized holes has a significantly greater relieving effect than using a few large holes.
[References]
1) Boucher CO. Impressions for complete dentures. J Am Dent Assoc, 1943, 30.1: 14-25.
[Objective]
This in vitro study aimed to evaluate the pressure generated by various tray designs during impression making. The null hypothesis was that no differences would be found in the pressure depending on the variations in tray relief and vent hole design.
[Method]
A specialized testing device was fabricated to measure a pressure. A digital occlusion analyzer device (T-scan, Tekscan Incorporation) was used to quantify and visualize the applied pressure. Three trays were designed to fit the sensor size of the device. Each tray was divided in half to feature different amounts of relief on each side; the contol group with 0.5mm relief, and the experimental groups with reliefs of 1 mm, 2 mm, and 3 mm. Additionally, three other trays were designed with varying vent hole designs on the experimental side; the control group has no vent hole, while the experimental groups varied in vent hole size and number. The relative pressure of each side was measured. Two types of polyvinyl siloxane impression materials (A, B) were used. Kruskal-Wallis test was used to evaluate the effect of relief amount and vent hole design.
[Results and Discussion]
A significant difference in relative pressure was found between the relief amounts of 2 mm and 3 mm when using impression material A. With impression material B, there were significant difference in relative pressure across all combinations of relief amounts. In terms of the relative pressure based on the size and the number of vent holes, a statistically significant differences were found among the three groups. The pressure generated during impression making was affected by by the type of impression material and tray design. The efficacy of different techniques for selective pressure application can vary depending on the impression material used. Using multiple small-sized holes has a significantly greater relieving effect than using a few large holes.
[References]
1) Boucher CO. Impressions for complete dentures. J Am Dent Assoc, 1943, 30.1: 14-25.