The Study of Surface Roughness and Flowability of Distilled Water on a Zirconia Plate After Treated with Various Types of Coupling Agent Solution
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Abstract
Objective: The aim of this study is to examine the occlusal parameters in the general population in different age groups, which there is still a few studies.
Materials and Methods: Fifty-six Thai subjects were divided into three different groups of age; group 1; young adulthood 20-39 years (10 males, 15 females), group 2; middle adulthood 40-60 years (10 males, 15 females) and group 3; elder more than 60 years (2 males, 4 females). The T-Scan III computerized occlusal analysis system was used to record a multi-bite closure and the occlusal parameters for each subject in all age groups. The percentage of occlusal force distribution, the occlusal contact area, the occlusion time and the disclusion time were calculated for all groups. Paired-sample t-test or Wilcoxon match-pair signed-rank test (p<0.05) was used to compare the within group differences, while a One-way ANOVA or Kruskal-Wallis H test (p<0.05) was used to analyze the differences between the three groups.
Results: The occlusal force distribution, the occlusal contact areas, the occlusion time and the disclusion time during maximum intercuspation position were similar in all groups. There was no statistically significant difference (p>0.05) in all groups. When the occlusal force distribution was compared within group, the bilateral right to left side occlusal force distribution was not statistically different for all groups. Statistically significant differences (p = 0.001) of occlusal distribution were recorded between the anterior and posterior quadrants in all groups which the more values were found in posterior when compared to the anterior areas. Moreover, a statistically significant difference (p=0.023, and p=0.021) was found in disclusion time during left and right lateral excursion, respectively.
Conclusion: This present study found no differences in the occlusal force distribution, occlusal contact areas, occlusion time and disclusion time between three different age groups. Only the differences of the disclusion time during left and right lateral excursion were found.
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