Major Topics in Quantitative Microradiography of Enamel and Dentin: R Parameter, Mineral Distribution Visualization, and Hyper-Remineralization

Arends, J; Ruben, Jurjen M.; Inaba, Daisuke

doi:10.1177/08959374970110040501

Cited by 69 publications

(50 citation statements)

References 24 publications

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“…This occurs because the dentin has greater organic content [1,27,28] and water (12% weight and 25% volume) [29][30][31], resulting in faster and higher mass removal.…”

Section: Discussionmentioning

confidence: 99%

Comparative ultrastructural analysis of Er:YAG laser scanner and conventional method for tooth cavity preparation

et al. 2017

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Purpose This study has compared morphological characteristics of dentin and enamel surfaces after cavity preparation by conventional methods and Er:YAG laser irradiation in different settings by using an Er:YAG laser scanner. Methods Thirty-five human teeth were randomly divided into seven groups that received cavity preparations as follows: G1 and G2 with high-speed drill with diamond and carbide burs, respectively, and G3 to G7 with Er:YAG laser scanner (λ = 2940 nm) operating at pulse energies (energy densities) of 420 mJ (840 J/cm 2 ), 490 mJ (980 J/cm 2 ), 560 mJ (1120 J/ cm 2 ), 630 mJ (1260 J/cm2) and 700 mJ (1400 J/cm2), respectively. The lased groups were treated with Er:YAG laser scanner in non-contact mode, keeping both frequency (20 Hz) and pulse duration (300 μs) fixed. Samples were sectioned and scanning electron micrographs of the lateral wall of the cavities were taken at different magnifications. Results The results showed that both groups of conventional cavity preparations exhibited enamel and dentin surfaces covered by smear layer, with no dentin-enamel boundary being identifiable. All lased groups showed clear enamel-dentin boundaries and clean surfaces of enamel and dentin with different micro-morphologies. The morphology of lased dental surfaces presented homogeneous alterations. Conclusions The Er:YAG scanner-assisted cavity preparation produced topographies in the entire dental surfaces and whose morphological characteristics were more favourable to further adhesion of resin restorations than the conventional ones.

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“…This occurs because the dentin has greater organic content [1,27,28] and water (12% weight and 25% volume) [29][30][31], resulting in faster and higher mass removal.…”

Section: Discussionmentioning

confidence: 99%

Comparative ultrastructural analysis of Er:YAG laser scanner and conventional method for tooth cavity preparation

et al. 2017

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“…The specimens were demineralized for 0 (sound control), 1, 3, 5, or 7 weeks in 0.1 M lactic acid gel containing 6 wt% of carboxymethyl cellulose adjusted to pH 5.0 with KOH and maintained at 37°C [14][15][16][17] . The artificial enamel erosion model was thus established by placing the specimens in the middle of a plastic container, which contained 100 ml of the lactic acid gel.…”

Section: Sample Preparationmentioning

confidence: 99%

Relationship between fluorescence loss of QLF and depth of demineralization in an enamel erosion model

et al. 2009

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The purpose of this study was to assess the relationship between quantitative light-induced fluorescence (QLF) values and demineralization depths in an enamel erosion model in vitro.Flat labial enamel surfaces of bovine incisors were ground with 800-grit SiC and coated with nail varnish, but also leaving rectangular windows of enamel uncoated. Subsequently, they were immersed in a lactic acid gel (pH 5.0) for 0 to 7 weeks to make an enamel erosion model. Carious lesions thus induced were analyzed by QLF and the demineralization depths measured using SEM/ EDS method at the end of each period. A wide range of erosive lesions were produced with a steady increase in both demineralizing depth and fluorescence loss (ΔF) over time. With this model, a good correlation was exhibited between each ΔF value and the demineralization depth. Results of this study indicated that QLF could detect and quantify mineral loss under the eroded surface of the enamel erosion model.

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“…These differences can be quite large, e.g., a carboxymethyl cellulose gel (6%) at pH = 5 causes approximately 33 volume % mineral loss in enamel per day, while an unstirred demineralization solution at pH = 5 causes 13 and 26% volume % mineral loss in enamel per hour, with and without fluorides added respectively. The demineralization rate increase by 1.6 when the solution was used on dentin surfaces [33].…”

Section: Dental Cariesmentioning

confidence: 98%

Secondary caries and microleakage

Jokstad

2016

Dental Materials

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Objectives: To critically appraise experimental ex vivo research that has focussed on secondary caries, and to offer possible explanations for the seemingly poor correlation to clinical observations. Methods: The literature relating to the etiopathogenesis or prevention of secondary caries gained from experimental ex vivo research was reviewed, with particular emphasis on microleakage and artificial caries-like lesions.Results: It is doubtful whether a caries wall lesion can exist independently of an outer enamel caries lesion. Microleakage experiments apparently continue to emerge regardless of multiple reviews questioning the reliability and validity of the method. Several of the approaches used to generate artificial caries-like lesions are very aggressive. Remarkably little discussion has evolved about how these aggressive approaches create microenvironments that do not occur in reality. Corrosion-and biodegradation products may influence the biofilm qualitatively and quantitatively and it is difficult to replicate these variables in any ex vivo environment. Clinical data sampling method, patient demography as well as study methodology influences the incidence and prevalence estimates of secondary caries. Clinical results based on clinical work in settings where cost per unit time is of nominal concern do not provide any indications on how the restorative material will perform when placed by the average dentists in the mouths of their spectrum of patients during a busy workday.Recommendations: The term "wall lesion" including its variants is ill defined, has been, and is still being used indiscriminately. Stakeholders should avoid using this ambiguous label due to its connotation to an entity that does not exist per se.

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Major Topics in Quantitative Microradiography of Enamel and Dentin: R Parameter, Mineral Distribution Visualization, and Hyper-Remineralization

Cited by 69 publications

References 24 publications

Comparative ultrastructural analysis of Er:YAG laser scanner and conventional method for tooth cavity preparation

Comparative ultrastructural analysis of Er:YAG laser scanner and conventional method for tooth cavity preparation

Relationship between fluorescence loss of QLF and depth of demineralization in an enamel erosion model

Secondary caries and microleakage

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