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The increase in global life expectancy has led to an aging population. Consequently, the number of people using dentures, predominantly elderly individuals, is continuously increasing 1) . As a result, cases of severe ridge resorption due to denture use are also increasing.Denture adhesives are dental materials used mainly to improve dysfunctional dentures 2) and can be classified as either powder, cream, or sheet types, or as a home reliner (cushion type). They can improve the denture retention and masticatory ability, thereby ensuring patient satisfaction 3) . Coates reported that at least 30% of people using dentures use denture adhesives 4) . While dentists generally believe that denture adhesives are not required when properly manufactured dentures are used 5) , patients with intractable cases (e.g., remarkable ridge resorption, thin mucous membrane, or xerostomia) struggle to use their dentures comfortably. Several researchers have attempted to address this issue while simultaneously combating oral microorganisms by developing denture adhesives with antimicrobial properties [6][7][8] . The effects of different forms of commercially available denture adhesives such as powder, cream, and sheet type, on the growth of oral microorganisms and the oral environment have been reported 9) .When surface pre-reacted glass-ionomer (S-PRG) fillers are added to dental materials, they release six ions: fluoride, strontium, sodium, aluminum, boric acid, and silicic acid, which impart various properties to the materials, such as antimicrobial effects, tooth re-mineralization ability, and acid buffering capacity [10][11][12][13][14][15] . More recently, S-PRG fillers have been introduced clinically in temporary cements, orthodontic resin, and tissue conditioners 14,16) . Thus, in this study, we attempted to add S-PRG fillers to the denture adhesives with the assumption that it may achieve a sufficient antimicrobial effect and acid buffering ability, and improve the oral environment of people using dentures. Specifically, denture adhesives with S-PRG fillers are expected to improve denture stomatitis and exhibit an antimicrobial effect against oral microorganisms such as Candida albicans and Streptococcus mutans [17][18][19] .This study aimed to assess the effect of various particle sizes and contents of S-PRG fillers on the acid buffering capacity, ion release, and antimicrobial effect of denture adhesives. The hypothesis was that different sizes and amounts of S-PRG fillers would affect these properties. MATERIALS AND METHODS S-PRG filler-containing denture adhesivesSix grades of adhesives containing S-PRG (Shofu, Kyoto, Japan) were prepared, and the detailed compositions are listed in Table 1. The study design is graphically explained in Fig. 1. Two particle sizes (1 and 3 µm) and three amounts of S-PRG (5, 7.5, and 10 wt%) were used, and the samples were labeled as follows: 1µm-5wt%, 1µm-7.5wt%, 1µm-10wt%, 3µm-5wt%, 3µm-7.5wt%, and 3µm-10wt%. Further, a denture adhesive without S-PRG was used as the control. When
The increase in global life expectancy has led to an aging population. Consequently, the number of people using dentures, predominantly elderly individuals, is continuously increasing 1) . As a result, cases of severe ridge resorption due to denture use are also increasing.Denture adhesives are dental materials used mainly to improve dysfunctional dentures 2) and can be classified as either powder, cream, or sheet types, or as a home reliner (cushion type). They can improve the denture retention and masticatory ability, thereby ensuring patient satisfaction 3) . Coates reported that at least 30% of people using dentures use denture adhesives 4) . While dentists generally believe that denture adhesives are not required when properly manufactured dentures are used 5) , patients with intractable cases (e.g., remarkable ridge resorption, thin mucous membrane, or xerostomia) struggle to use their dentures comfortably. Several researchers have attempted to address this issue while simultaneously combating oral microorganisms by developing denture adhesives with antimicrobial properties [6][7][8] . The effects of different forms of commercially available denture adhesives such as powder, cream, and sheet type, on the growth of oral microorganisms and the oral environment have been reported 9) .When surface pre-reacted glass-ionomer (S-PRG) fillers are added to dental materials, they release six ions: fluoride, strontium, sodium, aluminum, boric acid, and silicic acid, which impart various properties to the materials, such as antimicrobial effects, tooth re-mineralization ability, and acid buffering capacity [10][11][12][13][14][15] . More recently, S-PRG fillers have been introduced clinically in temporary cements, orthodontic resin, and tissue conditioners 14,16) . Thus, in this study, we attempted to add S-PRG fillers to the denture adhesives with the assumption that it may achieve a sufficient antimicrobial effect and acid buffering ability, and improve the oral environment of people using dentures. Specifically, denture adhesives with S-PRG fillers are expected to improve denture stomatitis and exhibit an antimicrobial effect against oral microorganisms such as Candida albicans and Streptococcus mutans [17][18][19] .This study aimed to assess the effect of various particle sizes and contents of S-PRG fillers on the acid buffering capacity, ion release, and antimicrobial effect of denture adhesives. The hypothesis was that different sizes and amounts of S-PRG fillers would affect these properties. MATERIALS AND METHODS S-PRG filler-containing denture adhesivesSix grades of adhesives containing S-PRG (Shofu, Kyoto, Japan) were prepared, and the detailed compositions are listed in Table 1. The study design is graphically explained in Fig. 1. Two particle sizes (1 and 3 µm) and three amounts of S-PRG (5, 7.5, and 10 wt%) were used, and the samples were labeled as follows: 1µm-5wt%, 1µm-7.5wt%, 1µm-10wt%, 3µm-5wt%, 3µm-7.5wt%, and 3µm-10wt%. Further, a denture adhesive without S-PRG was used as the control. When
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