Caries-Preventive Effect of Fissure Sealant Containing Surface Reaction-Type Pre-reacted Glass Ionomer Filler and Bonded by Self-etching Primer

Abstract

Objective: We aimed to evaluate the caries-preventive effect of a fissure sealant containing surface reactiontype pre-reacted glass ionomer (S-PRG) filler and bonded by self-etching primer versus those of 2 conventional resin-based sealants bonded by acid etching in terms of its impact on enamel demineralization and remineralization, enamel bond strength, and integrity of debonded enamel surfaces. Materials and method: Demineralization, remineralization, and bond strength on untreated enamel and enamel subsurface lesions of bovine incisors were assessed among the sealants by polarizing microscopy and microradiography; debonded enamel surfaces were examined by scanning electron microscopy. Results: The conventional resin-based sealants bonded by acid etching caused surface defects on the enamel subsurface lesions and significantly increased the lesion depth (p = 0.014), indicative of enamel demineralization. However, the SPRG filler-containing sealant bonded by self-etching primer maintained the enamel surface integrity and inhibited enamel demineralization. No difference in bond strength on both untreated enamel and enamel subsurface lesions was noted among the sealants. Conclusions: An S-PRG filler-containing fissure sealant bonded by self-etching primer can prevent enamel demineralization, microleakage, and gaps without the tags created by acid etching regardless of the enamel condition. Such sealants are suitable for protecting the pits and fissures of immature permanent teeth.

Effects of immersion in solution of an experimental toothpaste containing S-PRG filler on like-remineralizing ability of etched enamel

“…Since the direct bonding of orthodontic brackets to enamel was introduced by Newman 2) in the mid 1960s, acid-etching of enamel surfaces for bracket bonding procedures has been accepted in clinical orthodontics 3) . Also, pit-and-fissure sealant using resinbased materials that require an acid-etching process has been accepted to prevent occlusal caries in pediatric dentistry 4) . A previous in vitro study 5) showed that the mechanical properties of the enamel surface region were decreased by etching-based bracket bonding, and irreversible alteration of the enamel might increase the risk of enamel micro cracks during debonding procedures.…”

Effects of CO₂ laser irradiation combined with fluoride application on the demineralization, mechanical properties, structure, and composition of enamel

“…The crystal structure of the enamel surface may change from hydroxyapatite to fluorapatite with laser irradiation and fluoride application. 4. The values of MD, hardness, and elastic modulus of the enamel surface after immersion in demineralization solution were correlated.…”

“…The acids produced by bacteria in the oral environment cause the demineralization of the enamel. The enamel of an immature tooth and around an orthodontic bracket is at extremely high risk of demineralization 3,4) . Because fluoride plays an important role in preventing demineralization, fluoride-containing products, such as toothpastes, mouth rinses, pit-and-fissure sealants, and fluoride-releasing adhesives, have been used widely clinically [4][5][6] .…”

“…The enamel of an immature tooth and around an orthodontic bracket is at extremely high risk of demineralization 3,4) . Because fluoride plays an important role in preventing demineralization, fluoride-containing products, such as toothpastes, mouth rinses, pit-and-fissure sealants, and fluoride-releasing adhesives, have been used widely clinically [4][5][6] . Previous studies have demonstrated the inhibitory potential of CO 2 laser irradiation on enamel demineralization [7][8][9][10][11][12] and irradiation conditions, such as wavelength, pulse width and pulse energy 9,12) , the temperature change of the enamel 10) , and changes in the composition and structure of the enamel have been investigated 10,11) .…”

Antimicrobial activity of ethylene-vinyl acetate containing bioactive filler against oral bacteria

“…These multiple ions eluted from some S-PRG filler-containing dental materials have various bioactive effects, such as strengthening of the tooth structure [16][17][18] , anti-plaque effect 19,20) , dentin remineralization [21][22][23] , acid-buffering capacity 15,24) , and inhibition of enzymatic activity of periodontopathic bacteria 25,26) . However, no studies have addressed the bioactive effect of mouthguards containing the S-PRG filler.…”