EVALUATION OF ACIDOGENICITY OF COMMERCIAL ISOMALTOOLIGOSACCHARIDES MIXTURE AND ITS HYDROGENATED DERIVATIVE BY MEASUREMENT OF PH RESPONSE UNDER HUMAN DENTAL PLAQUE

The acidogenicity of commercially available isomaltooligosaccharides m ixture (IMO) and its hydrogenated derivative (IMO-H) were evaluated by the in vivo pH response under dental plaque of six subjects (aged 25- 28) using intraoral apparatus. The apparatus, an indwelling PH sensor of a hydrogen ion-sensitive field effect transducer (ISFET), was place d on the buccal site of the mandibular first molar, and the plaque was accumulated for four days. The test sugars were applied with three me thods-dropping the solution directly on the plaque, rinsing the oral c avity with the solution, and sucking a candy made of the test sugar (w eight 3-4 g). IMO could not be evaluated as a type of sugar with low a cidogenicity, especially by the candy method, but IMO-H could be evalu ated as a type of sugar with very low acidogenicity in a similar manne r as maltitol or sorbitol in all type of applications. The acidogenic response of dental plaque should be assumed to be closely related to s alivary parameters such as the secretion rate or to mutans streptococc i level of subjects and types of application.