The Ultrastructure and Hardness of the Transparent of Human Carious Dentin

Ogawa, Kazuyuki; Yamashita, Yasuo; Ichijo, Takashi; Fusayama, Takao

doi:10.1177/00220345830620011701

Cited by 174 publications

(164 citation statements)

References 8 publications

Supporting

Mentioning

130

Contrasting

Unclassified

Order By: Relevance

“…The physical and chemical characteristics of caries-affected dentin are very different from those of normal dentin. Caries-affected dentin is softer than normal dentin because it is partially demineralized 11,[14][15][16] . Compared with normal dentin, crystals of intertubular caries-affected dentin are scattered and randomly distributed with larger apatite crystallites and wider inter-crystalline spaces 17) .…”

Section: Introductionmentioning

confidence: 99%

“…Compared with normal dentin, crystals of intertubular caries-affected dentin are scattered and randomly distributed with larger apatite crystallites and wider inter-crystalline spaces 17) . Moreover, most tubules of caries-affected dentin are occluded with mineral deposits 15,16) . Electron probe microanalysis also showed that elemental contents are different between normal and caries-affected dentin surfaces 13) .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Rise under Normal and Caries-Affected Primary Tooth Dentin Disks during Polymerization of Adhesives and Resin-containing Dental Materials

et al. 2008

View full text Add to dashboard Cite

The purpose of this study was to compare the temperature rise under normal and caries-affected primary tooth dentin during photopolymerization of two adhesives and resin-containing restorative materials. Caries-affected and normal dentin disks were prepared from extracted primary molars with only mesial or distal approximal caries (4 mm in diameter, 1 mm in height). Temperature rise during photopolymerization of adhesive materials was measured with a J-type thermocouple wire that was connected to a data logger. Data were analyzed with two-way ANOVA and independent samples t-test. Temperature rise under caries-affected primary tooth dentin disks was higher than that of normal primary tooth dentin disks during polymerization of both adhesive systems and resin-containing dental materials (p<0.05). It was found that adhesive systems induced a higher temperature rise during polymerization as compared to the resin-containing restorative materials (p<0.05). In particular, temperature rise during polymerization of adhesive materials exceeded 5.5℃ under caries-affected primary tooth dentin.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature Rise under Normal and Caries-Affected Primary Tooth Dentin Disks during Polymerization of Adhesives and Resin-containing Dental Materials

et al. 2008

View full text Add to dashboard Cite

show abstract

“…1 Caries-affected dentin contains intrinsic properties that are different from normal dentin, such as reduced permeability because of formation of whitlockites within the dentinal tubules and a partially demineralized intertubular dentin. [2][3] Ideally, in order to maximally preserve the tooth substrate, the clinical bonding substrate should be caries-affected dentin. However, during restorative preparations, it may be very difficult to avoid cutting into normal dentin due to the irregular shape of the caries lesion.…”

Section: Introductionmentioning

confidence: 99%

Bond Strengths of a 1-Step Self-etching System to Caries-affected and Normal Dentin

Pereira¹,

Nunes²,

Miguez³

et al. 2006

Operative Dentistry

View full text Add to dashboard Cite

©Operative Dentistry, 2006, 31-6, 677-681 PNR Pereira • MF Nunes PA Miguez • EJ Swift Jr Clinical RelevanceThe 1-step self-etching adhesive had significantly higher mean bond strength to normal dentin than to caries-affected dentin. Although Single Bond had a similar tendency, bonds to normal dentin and caries-affected dentin were not significantly different. SUMMARYThis study was designed to evaluate the bond strengths of a 1-step self-etching system and a 2-step "etch and rinse" adhesive system to cariesaffected dentin and normal dentin. In addition, the micromorphology of the adhesive interfaces was analyzed using scanning electron microscopy (SEM). Extracted human molars with occlusal caries that had been stored frozen were ground in order to expose the caries-affected dentin and surrounding normal dentin. The teeth were then bonded using either Adper Prompt LPop or Single Bond (3M ESPE) and restored with Filtek Z250 (3M ESPE). After storage in water for 24 hours at 37°C, the teeth were sectioned, prepared for microtensile bond strength test and tested in tension at a crosshead speed of 1-mm/minute. After debonding of the interfaces, microhardness of the dentin underlying the interface of all specimens was measured. The thickness of the hybrid layers was observed under SEM. The results of this study indicate that the bond strength of Adper Prompt L-Pop adhesive was significantly higher to normal dentin than to caries-affected dentin (p<0.05) and that the bond strength of Single Bond to both normal and caries-affected dentin was not significantly different (p>0.05). Additionally, the thickness of the hybrid layers produced by both adhesive systems was thicker for caries-affected dentin.

show abstract

“…However, clinical guidelines for removal of this substrate are problematic and controversial. According to previous studies, the inner affected layer of carious dentin which is un-infected and remineralizable can be softer than normal dentin [1,2] or have similar properties to normal dentin. [3] These findings suggest that traditional tactile based characteristics of carious dentin often sacrifice more structure than necessary.…”

Section: Introductionmentioning

confidence: 95%

“…Carious dentin has a Knoop hardness that is less than that of normal dentin [1,15], indicating that it has a certain level of demineralization, even though the lumina of many of the dentin tubules are occluded with mineral crystals [18] to form the transparent layer. Dentin that is partially demineralized by caries may exhibit further mineral loss when it is treated with acidic bonding conditioners, resulting in a deeper penetration of adhesive resin and a thicker resin infiltrated layer formation during bonding.…”

Section: Introductionmentioning

confidence: 99%

SEM evaluation of resin-carious dentin interfaces formed by two dentin adhesive systems

et al. 2008

View full text Add to dashboard Cite

Objectives-We investigated the influence of dentin tubule direction and identifiable zone of carious dentin on the microstructure and the thickness of the hybrid-like layer (HL) formed by selfetch and etch-rinse adhesive systems.Methods-An etch-rinse and a self-etching adhesive were bonded to dentin carious zones divided into groups with parallel or perpendicular orientation relative to the dentin tubules at the resin-carious dentin interface (N = 5/variable). Bonds were prepared to each of the four zones of carious dentin apparent after staining with Caries Detector: pink, light pink, transparent and apparently normal Six non-carious third molars were controls. The microstructure and thickness of the HL were determined by SEM.and compared using three-way ANOVA and Tukey's multiple comparisons (p<0.05).Results-Etch-rinse controls gave thicker HLs than self-etching systems; ; orientation did not affect thickness for the self-etch system. Perpendicular orientations gave thicker HLs than parallel for the pink zone bonded with the etch-rinse system. For both adhesives, HL thickness in the pink zone were significantly greater than in light pink for the perpendicular group, but no significant differences were found among other variables. HL microstructure was more granular and rougher for the etch rinse than for the self etching system. Pores and cracks were obvious in the more demineralized zones, Resin tags were shorter and irregular in the transparent zone and often were completely absent in the outer demineralized zones (pink, light pink).Significance-Microstructure of bonded interfaces varies markedly depending on adhesive system, tubule orientation and carious zone.

show abstract

The Ultrastructure and Hardness of the Transparent of Human Carious Dentin

Cited by 174 publications

References 8 publications

Temperature Rise under Normal and Caries-Affected Primary Tooth Dentin Disks during Polymerization of Adhesives and Resin-containing Dental Materials

Temperature Rise under Normal and Caries-Affected Primary Tooth Dentin Disks during Polymerization of Adhesives and Resin-containing Dental Materials

Bond Strengths of a 1-Step Self-etching System to Caries-affected and Normal Dentin

SEM evaluation of resin-carious dentin interfaces formed by two dentin adhesive systems

Contact Info

Product

Resources

About