This clinical report describes the procedure to fabricate a continuous anterior-posterior fixed partial denture incorporated with an existing adjacent pontic on a cantilever fixed partial denture using a resin-bonded connector. The partial denture was made of silver-palladium-copper-gold alloy. The cast bolt was made of the same alloy and inserted to gain additional mechanical retention. Consequently, a continuous five-unit fixed partial denture was created. The continuous five-unit fixed partial denture has functioned sufficiently for more than seven years.

Purpose: To confirm the incipient caries so called white spot can be reversible process of demineralization and remineralization.

Materials and Methods: A total of 128 pupils were selected for the analysis. Dentists conducted oral examinations under light using dental mirrors. Images of the labial surface of the maxillary right and left central incisors of all the subjects captured using the quantitative light-induced fluorescence (QLF) systems. Saliva samples were obtained by having subjects chew a gum base for at least 3 minutes that contained no taste or flavor additives. Salivary pH value was evaluated using pH testing paper.

Results: In this study, we revealed the 3 months variation of the incipient caries in Japanese school children. Even DMF/DMFT was a low level, over one third of all pupils (37.5%) had incipient caries detected by the quantitative light-induced fluorescence (QLF). After 3 months, 11 pupils (8.6%) had disappeared the incipient caries in central incisors. However, newly incipient caries were appeared in residuary pupils. Finally, a half of all pupils had incipient caries detected.

Conclusion: In this study, we revealed the three months variation of the incipient caries in Japanese school children using the quantitative light-induced fluorescence (QLF). We found that 8.6% of the subjects had disappeared the incipient caries. This data shows that the incipient caries is a reversible process of tooth demineralization and remineralization.

Purpose: The aim of this study is to evaluate the clinical efficacy and safety of a new dental drug delivery system (3DS) for the selective reduction of mutans streptococci, a potent risk factor for dental caries.

Materials and Methods: Twelve patients were assigned to two groups, professional mechanical tooth cleaning (PMTC) with or without 3DS. The efficiency of 3DS with 0.2% chlorhexidine (CHX) in reducing the salivary levels of total Streptococci, mutans streptococci, and Lactobacilli, was investigated. The subjects in the 3DS combination group were treated with PMTC and subsequently individual trays with CHX for five minutes. Salivary bacterial samples were taken at baseline and in weeks 1, 2, 3, 4, and 8.

Results: Non-significant changes in the total Streptococci, mutans streptococci, and Lactobacilli counts were found during the effects of two groups in the study period (p>0.05). However, the proportion of mutans streptococci in total Streptococci at 3DS group was still low after 8 weeks compared with baseline, but not significant.

Conclusion: The results indicate that 3DS in combination with PMTC is an effective intraoral drug delivery system that specifically reduces mutans streptococci, especially in proportion of the total streptococci without any adverse effects.