Showing papers by "G.A. van der Weijden published in 1995"

Oral microbiota in subjects with a weak or strong response in experimental gingivitis

Abstract: The purpose of the present study was to examine the composition of the oral microbiota in subjects who had previously demonstrated to develop either a weak or strong response to experimental gingivitis. For this study, subjects were selected from a pool of 25 individuals who had participated twice in an experimental gingivitis trial. Out of these 25 panellists, 6 subjects were selected who had developed 2X a weak gingival inflammatory response and 7 subjects who had developed 2X a strong gingival inflammatory response. Approximately 9 months after the 2nd experimental gingivitis trial, we evaluated the clinical condition and the prevalence of a panel of selected oral micro-organisms in these subjects. The subjects were clinically examined for the presence of plaque, bleeding, pocket depth and loss of attachment. For the microbiological evaluation, samples were taken from the mucous membranes, subgingival sites and saliva. Samples were analyzed for the presence of Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia, Peptostreptococcus micros, Actinomyces spp., Fusobacterium nucleatum, Campylobacter rectus, spirochaetes and motile rods. Clinical evaluation showed that most subjects had a relatively healthy periodontal condition. No clinically significant differences could be detected between the weak and strong responding groups. The microbial evaluation showed absence of A. actinomycetemcomitans, P. gingivalis and P. micros in all subjects in either group. Analysis of the microbial data for the weak and strong responding group showed no differences between the groups.(ABSTRACT TRUNCATED AT 250 WORDS)

Comparison of 2 electric toothbrushes in plaque‐removing ability Professional and supervised brushing

Abstract: . The purpose of the present study was to compare the Braun Plak Control® (D7) and Philips HP 500® (MM) in their plaque removing efficacy. Furthermore the brushing force applied by the panellist on the brush-head with both these brushes was evaluated. For this study, 35 university students (non-dental) were selected. The study consisted of 3 experiments. Prior to each experiment, all subjects were asked to abstain from all oral hygiene procedures for at least 48 h. In Exp. I, the efficacy of toothbrushing was studied when one of the investigators brushed the teeth of the panellists. In Exp. II, the efficacy of the brushing was studied after the students had received a professional instruction. In Exp. III, the brushing force used during a single brushing exercise was evaluated. The available time for the brushing amounted to a total of 2 min per mouth. Dental plaque was evaluated by means of the Silness and Loe and Quigley and Hein plaque indices assessed at 6 sites per tooth. Results showed that both in Exp. I and Exp. II, the D7 removed significantly more plaque than the MM electric toothbrush. The plaque reduction assessed according to Silness and Loe in Exp. I was for the D7, 1.07 and for the MM, 0.78. In Exp. II, the reduction was 1.08 and 0.88, respectively. The results of Exp. III show that the mean brushing force was comparable for both brushes (D7=I73 g, MM=I75 g). All 35 subjects were allowed to choose one electric toothbrush as compensation for their participation. The majority (n=26) of subjects preferred the D7 to the MM. In conclusion, the results of the present study show that given a choice, there was a preference of the panellists for the D7. No difference in brushing force was observed between the 2 brushes. Evaluation of plaque removing efficacy showed that the Braun Plak Control® is more effective than the Philips HP 500®.