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[A clinical investigation of the dental plaque formation and its propagative process].

With 42 3rd and 84 5th graders of an elementary school in Tokyo as study subjects, the authors were concerned with toothbrushing of the surface of their anterior teeth, both maxillary and mandibular, and photographs were taken of them 3 days later in an effort to examine the manner of the dental plaque formation and its propagative process on the maxillary central and lateral incisors.Of them, 80% central and 83% lateral incisors were found to be deposited by the dental plaque in the 3rd graders, while 86% central and 97% lateral incisors were found to be deposited by the dental plaque in the 5th graders.Of these cases, those in which the plaque formation took place on the cervical region alone were 56% central and 48% lateral incisors in the former, and 53% central and 53% lateral incisors in the latter group, the incidence of this type being most prominent than any other types.The types which corresponded to the second or third degrees of the Greene's classification included 1 case of lingual rotation of central, 4 cases of lingual rotation of lateral incisors and 3 cases of torquing in the 3rd graders with a percentage of 5.4. All of these were found to be in places difficult of adequate toothbrushing.With regard to the 5th graders, on the other hand, the total included 2 cases of central incisor torquings, 4 cases of imperfect toothbrushing, 8 cases of lingual retation of lateral incisors and torquing each, and 4 cases of imperfect toothbrushing with a percentage of 8.7.Those corresponding to the second or third degree in the Greene's 4-degree classification were rarely found. They were confined to those cases of imperfect toothbrushing or those where the routine toothbrushing was difficult because of abnormal positions.