Study on the Effectiveness of Newly Erupted Permanent Tooth Plaque Removal : Part-II On toothbrush cleaning method of mandibular first permanent molar

Toothbrushing to physically remove plaque is one of the most commonly recommended and reliable means to achieve good oral hygiene. However, good brushing skills are needed particularly for the newly erupted first permanent molars because the anatomical structures and eruption processes of the first permanent molars are very complicated. In the study, thirty children aged 5-9 years participated, and OHI (oral hygiene index) for each child was assessed before and after by using two types of powered toothbrushes (arcuate and vibratory motions) and a regular manual toothbrush in removing supragingival plaque from the first permanent molars. Results were as follows: 1) In all surfaces of the maxillary and mandibular first permanent molars, the effects of the powered toothbrushes in removing supragingival plaque were found to be better than the manual toothbrush. 2) On right side of first permanent molars, a significant difference was found among arcuate powered toothbrush, vibratory powered toothbrush and the manual toothbrush. On the contrary, on the left side of first permanent molars, a significant difference was only found between the arcuate and the manual toothbrush. 3) In all different eruption stages of the first permanent molar, the effects of powered toothbrushes in removing supragingival plaque were found to be better than the manual toothbrush

Study on the Effectiveness of Plaque Removal on Newly Erupted Permanent Teeth : Part-I The distribution of dental plaque accumulation on mandibular first permanent molar

The immature teeth, especially the first permanent molars show a high caries rate with plaque accumulation. Plaque accumulates easily on newly erupted first permanent molars because of its anatiomical structures, complicated eruption processes and shortage of self-cleaning action. In this study, according to the eruption status of the mandibular first permanent molar, 42 children with the newly erupted molars were divided into 3 stages. Plaque distribution was investigated by using a special camera which was designed by the author et al. According to the photos, plaque distribution on the molars was evaluated and analyzed statistically by computer. Results were as follows: 1. On the different eruption stages: Plaque accumulation was highest in the early eruption stage and decreased as the molars erupted. Significant difference was found between eruption stage 1 and stage 2. 2. On the occlusal surfaces (mesio-part, central-part and distal part): Plaque accumulation decreased on the each part of the occlusal surfaces as the molars erupted. 3. Plaque accumulation on buccal surfaces of the molars was found to decrease as the molars erupted. Significant difference was found among each of the eruption stages. 4. As the molars attained occlusal position, plaque accumulation had a tendency to decline. 5. There was no relationship between the subjects with TBI experience and without it, however, plaque accumulation decreased as the molars erupted