Effects of Saliva Secretion on the Assessment of Masticatory Performance

Abstract

This study confirms that the saliva secreted during gummy jelly chewing has an influence on the masticatory performance which was obtained by measuring glucose extraction. AbstractPurpose: The purpose of this experiment was to clarify whether the amount of saliva secreted during the chewing gummy jelly affected the assessment of masticatory performance. Methods:Twenty healthy subjects were asked to chew 2 g of gummy jelly for 10, 15, and 20 seconds and the amounts of glucose extraction and saliva secretion were measured. The changes in both glucose extraction and saliva from 10 to 20 seconds were investigated. Next, the amount of glucose extraction excluding the effect of saliva (extraction B) was divided by the amount of glucose extraction measured (extraction A), and the results for the two chewing times were compared. Results:The amount of glucose extraction increased proportionally as the chewing time progressed and the change was significant. Although the amount of saliva secretion increased as the chewing time progressed, the change differed from the proportional change in glucose extraction. The amount of saliva secretion was extensive for the first 10 seconds and increased about 0.1 ml every 5 seconds. The ratio of the extraction B to extraction A was between 1.03 and 1.05, and there was a significant difference between each pair of chewing times. Conclusion:From these results it was concluded that the amount of saliva secretion increased during chewing of gummy jelly and affected the assessment of masticatory performance, and this effect was less than 5 % for chewing of up to 20 seconds.

Usefulness of newly devised food intake score in removable denture wearers

“…[23][24][25][26][27] Recently, themethodofcalculatingandevaluatingthefoodintakescore(FIS) from the results of questionnaires has been widely used. 12,[28][29][30][31][32][33][34][35][36][37][38][39][40][41] Thus, both objective and subjective methods are used to evaluate masticatory performance, with some studies combining both methods, 2,12,15,24,33,34,37,39,40,42,43 some using only objective methods 1,[3][4][5][6][7][8][9][10]11,14,[16][17][18][19][20][21][22]26,…”

“…Among them, the amount of glucose extracted (AGE) during chewing of gummy jelly is widely used in children, the elderly and denture wearers 2,6–8,10,12,14,16,17,19 . It has been reported that AGE increases proportionally with the amount of work 20 ; thus, a positive correlation is observed between the masticatory performance by the amount of glucose extracted and the masticatory performance by the sieving method 21 . AGE decreases with tooth loss 1,7 but increases after dental treatment 4,8,11,17 .…”

“…Thus, both objective and subjective methods are used to evaluate masticatory performance, with some studies combining both methods, 2,12,15,24,33,34,37,39,40,42,43 some using only objective methods 1,3–10,11,14,16–22,26,30–32,35,44 and others using only subjective methods 23,25,27,28,29,36,38,41,45–47 . However, there is no doubt that objective methods are more appropriate than subjective methods for evaluating masticatory performance.…”