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  1. Article ; Online: Analysis of Calcium and Phosphate Ion Extraction From Dental Enamel by Bleaching Gels Using Ion Chromatography, Micro-CT, and SEM.

    de Mendonça, L C / Rodrigues, MdeLA / Bicalho, A A / da Silva, G R / Quagliatto, P S / Santos, D Q / Soares, C J

    Operative dentistry

    2024  Volume 49, Issue 2, Page(s) 157–165

    Abstract: Objectives: To evaluate the volume and depth of enamel loss promoted by 37.5% and 7.5% hydrogen peroxide (HP) gels, and quantify the loss of calcium (Ca) and phosphate (P) ions by using ion chromatography (IC) analysis after bleaching.: Methods: ... ...

    Abstract Objectives: To evaluate the volume and depth of enamel loss promoted by 37.5% and 7.5% hydrogen peroxide (HP) gels, and quantify the loss of calcium (Ca) and phosphate (P) ions by using ion chromatography (IC) analysis after bleaching.
    Methods: Sixty bovine enamel specimens were randomly divided into three groups: Control - no bleaching gel; HP37.5%, application of HP 37.5% for 45 minutes for 14 days; and HP7.5%, application of HP 7.5% for 3 applications of 8 minutes. The surface analysis (n=5) was performed using a scanning electron microscope (SEM) and dispersive energy system (EDS) to calcium and phosphorus dosage. The micro-CT was used for the enamel loss analysis (n=5). IC was used to analyze extracted Ca and P (n=10). Data were analyzed by one-way ANOVA and two-way repeated measures ANOVA, followed by Tukey and Dunnett's tests (α=0.05).
    Results: Significantly higher volume and depth of enamel loss were found for bleached groups compared with the control group. HP7.5% had significantly higher enamel change than HP37.5%. SEM showed higher enamel porosity for HP37.5% and HP7.5% compared to control. The IC demonstrated a significant increase of Ca incorporated into the gel, however, only HP7.5% had a higher P presence than the control group. The HP7.5% showed higher Ca and P ion exchange than HP37.5% (p<0.001).
    Conclusion: HP37.5% and HP7.5%, caused enamel mineral changes compared with the control group. The IC method was demonstrated to be an effective methodology for detecting enamel mineral loss by the bleaching gel.
    MeSH term(s) Animals ; Cattle ; Calcium ; Tooth Bleaching/methods ; Dental Enamel ; X-Ray Microtomography ; Hydrogen Peroxide/chemistry ; Minerals ; Phosphates ; Gels ; Tooth Bleaching Agents
    Chemical Substances Calcium (SY7Q814VUP) ; Hydrogen Peroxide (BBX060AN9V) ; Minerals ; Phosphates ; Gels ; Tooth Bleaching Agents
    Language English
    Publishing date 2024-02-13
    Publishing country United States
    Document type Journal Article
    ZDB-ID 752995-8
    ISSN 1559-2863 ; 0361-7734
    ISSN (online) 1559-2863
    ISSN 0361-7734
    DOI 10.2341/23-026-L
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  2. Article ; Online: Use of Computerized Microtomography, Energy Dispersive Spectroscopy, Scanning Electron Microscopy, and Atomic Force Microscopy to Monitor Effects of Adding Calcium to Bleaching Gels.

    Mendonça, L C / Rodrigues, Mla / Bicalho, A A / daSilva, G R / Quagliatto, P S / Soares, C J

    Operative dentistry

    2022  Volume 47, Issue 3, Page(s) E162–E173

    Abstract: Objectives: The aim of this study was to evaluate the mineral content, expressed by calcium (Ca) and phosphate (P), in dental enamel exposed to bleaching agents using micro-computed tomography (micro-CT), scanning electron microscopy (SEM), energy ... ...

    Abstract Objectives: The aim of this study was to evaluate the mineral content, expressed by calcium (Ca) and phosphate (P), in dental enamel exposed to bleaching agents using micro-computed tomography (micro-CT), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and atomic force microscopy (AFM).
    Methods: Sixty bovine dental enamel specimens were randomly divided into three groups (n=20): HP35ca (bleached using 35% hydrogen peroxide with Ca); HP35wca (bleached using 35% hydrogen peroxide without Ca); and control (without bleaching). Five specimens from each group were used for SEM and EDS analyses, 10 specimens were used for AFM analysis, and the remaining five specimens were used for micro-CT analysis. The pH of the gels was measured using a pH meter. The EDS and micro-CT data were analyzed using one-way ANOVA and Pearson's correlation test. The AFM data were analyzed using one-way ANOVA (α=0.05).
    Results: The weight percentages of Ca and P obtained using EDS were similar between the bleached and control groups. Small, superficial changes were observed by SEM in the HP35wca group. The HP35ca group showed similar patterns to the control group. AFM results showed no significant changes in the enamel roughness in any of the tested groups. No significant difference in the volume or depth of structural enamel loss was found between gels with and without Ca. No mineral loss was observed in the dentin substrate. The EDS and micro-CT analysis data exhibited a high correlation (p<0.001).
    Conclusion: The addition of Ca to the bleaching gel had no beneficial effect on the bleached tooth enamel in terms of composition, mineral loss, and surface roughness. Micro-CT results exhibited a high correlation with the EDS results.
    MeSH term(s) Animals ; Calcium/analysis ; Calcium/chemistry ; Cattle ; Dental Enamel/chemistry ; Dental Enamel/drug effects ; Gels/chemistry ; Hydrogen Peroxide/chemistry ; Hydrogen Peroxide/pharmacology ; Microscopy/methods ; Microscopy, Atomic Force ; Microscopy, Electron, Scanning ; Phosphates/analysis ; Random Allocation ; Spectrometry, X-Ray Emission ; Tooth Bleaching/methods ; Tooth Bleaching Agents/chemistry ; Tooth Bleaching Agents/pharmacology ; X-Ray Microtomography
    Chemical Substances Gels ; Phosphates ; Tooth Bleaching Agents ; Hydrogen Peroxide (BBX060AN9V) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2022-05-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 752995-8
    ISSN 1559-2863 ; 0361-7734
    ISSN (online) 1559-2863
    ISSN 0361-7734
    DOI 10.2341/20-217-L
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  3. Article: Influence of matrix metalloproteinase synthetic inhibitors on dentin microtensile bond strength of resin cements.

    Stape, T H S / Menezes, M S / Barreto, B C F / Aguiar, F H B / Martins, L R / Quagliatto, P S

    Operative dentistry

    2012  Volume 37, Issue 4, Page(s) 386–396

    Abstract: This study evaluated the effect of dentin pretreatment with 2% chlorhexidine (CHX) or 24% ethylenediamine tetra-acetic acid gel (EDTA) on the dentin microtensile bond strength (μTBS) of resin cements. Composite blocks were luted to superficial noncarious ...

    Abstract This study evaluated the effect of dentin pretreatment with 2% chlorhexidine (CHX) or 24% ethylenediamine tetra-acetic acid gel (EDTA) on the dentin microtensile bond strength (μTBS) of resin cements. Composite blocks were luted to superficial noncarious human dentin (n=10) using two resin cements (RelyX ARC [ARC] and RelyX U100 [U100]) and three dentin pretreatments (without pretreatment-control, CHX, and EDTA). CHX was applied for 60 seconds on the acid-etched dentin in the ARC/CHX group, and for the same time on smear layer-covered dentin in the U100/CHX group. EDTA was applied for 45 seconds on smear-covered dentin in the U100/EDTA group, and it replaced phosphoric acid conditioning in the ARC/EDTA group for 60 seconds. After storage in water for 24 hours, specimens were prepared for microtensile bond strength testing. The results were submitted to two-way analysis of variance (ANOVA) followed by Tukey test. ARC produced significantly higher μTBS (p<0.05) compared to the U100, except when EDTA was used. For ARC, no pretreatment and CHX produced higher μTBS than EDTA. For U100, EDTA produced higher μTBS; no statistical difference occurred between CHX pretreatment and when no pretreatment was performed. While CHX did not affect immediate dentin bond strength of both cements, EDTA improved bond strength of U100, but it reduced dentin bond strength of ARC.
    MeSH term(s) Acid Etching, Dental/methods ; Bisphenol A-Glycidyl Methacrylate/chemistry ; Chlorhexidine/chemistry ; Composite Resins/chemistry ; Dental Bonding ; Dental Stress Analysis/instrumentation ; Dentin/ultrastructure ; Edetic Acid/chemistry ; Humans ; Materials Testing ; Matrix Metalloproteinase Inhibitors ; Methacrylates/chemistry ; Microscopy, Electron, Scanning ; Polyethylene Glycols/chemistry ; Polymethacrylic Acids/chemistry ; Resin Cements/chemistry ; Smear Layer ; Stress, Mechanical ; Surface Properties ; Tensile Strength ; Time Factors ; Water/chemistry
    Chemical Substances Composite Resins ; Matrix Metalloproteinase Inhibitors ; Methacrylates ; Polymethacrylic Acids ; RelyX ARC ; Resin Cements ; filtek Z350 ; Water (059QF0KO0R) ; Polyethylene Glycols (30IQX730WE) ; Bisphenol A-Glycidyl Methacrylate (454I75YXY0) ; Edetic Acid (9G34HU7RV0) ; Chlorhexidine (R4KO0DY52L)
    Language English
    Publishing date 2012-07
    Publishing country United States
    Document type Comparative Study ; Journal Article ; Randomized Controlled Trial
    ZDB-ID 752995-8
    ISSN 1559-2863 ; 0361-7734
    ISSN (online) 1559-2863
    ISSN 0361-7734
    DOI 10.2341/11-256-L
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Effect of gamma irradiation and restorative material on the biomechanical behaviour of root filled premolars.

    Soares, C J / Roscoe, M G / Castro, C G / Santana, F R / Raposo, L H A / Quagliatto, P S / Novais, V R

    International endodontic journal

    2011  Volume 44, Issue 11, Page(s) 1047–1054

    Abstract: Aim: To investigate ex vivo the influence of gamma irradiation therapy and restorative material on fracture resistance, fracture mode and strain of root filled human premolars.: Methodology: Sixty extracted human maxillary premolar teeth were ... ...

    Abstract Aim: To investigate ex vivo the influence of gamma irradiation therapy and restorative material on fracture resistance, fracture mode and strain of root filled human premolars.
    Methodology: Sixty extracted human maxillary premolar teeth were randomly divided into six groups (n = 10) determined by two study factors: (i) restorative materials: sound teeth, root filled teeth restored with composite resin, root filled teeth restored with amalgam; (ii) gamma irradiation: irradiated (subjected to 60 Gy of gamma irradiation in daily increments of 2 Gy) and nonirradiated. For the strain gauge test, two strain gauges per sample were attached on the buccal and palatal cusp surfaces (n = 5). Strain values were recorded during loading of 0-150 N. Fracture resistance (N) was assessed in a mechanical testing machine (n = 10). Strain gauge for each cusp and fracture resistance data were analysed by two-way anova (3 × 2) followed by the Tukey's honestly significant difference test (α = 0.05). The failure mode was evaluated using an optical stereomicroscope and classified according to the location of the failure.
    Results: Gamma radiation therapy significantly reduced the fracture resistance of intact teeth. The strain was higher for teeth restored with amalgam than for those restored with composite resin. The teeth restored with composite resin had similar strain values to sound teeth. Nonirradiated teeth had more restorable failures than irradiated teeth.
    Conclusions: Gamma irradiation significantly reduced fracture resistance and increased cusp strain. The use of composite resin resulted in better biomechanical behaviour than amalgam for restoring root filled teeth whether or not they were submitted to radiotherapy.
    MeSH term(s) Analysis of Variance ; Bicuspid/pathology ; Bicuspid/radiation effects ; Biomechanical Phenomena ; Case-Control Studies ; Composite Resins/radiation effects ; Dental Amalgam/radiation effects ; Dental Materials/radiation effects ; Dental Restoration Failure ; Dental Restoration, Permanent ; Dental Stress Analysis ; Gamma Rays/adverse effects ; Humans ; Maxilla ; Radiotherapy/adverse effects ; Radiotherapy Dosage ; Reference Values ; Root Canal Therapy ; Statistics, Nonparametric ; Tooth Fractures/etiology ; Tooth Fractures/pathology ; Tooth, Nonvital/complications
    Chemical Substances Composite Resins ; Dental Materials ; Dental Amalgam (8049-85-2)
    Language English
    Publishing date 2011-11
    Publishing country England
    Document type Journal Article ; Randomized Controlled Trial ; Research Support, Non-U.S. Gov't
    ZDB-ID 603734-3
    ISSN 1365-2591 ; 0143-2885
    ISSN (online) 1365-2591
    ISSN 0143-2885
    DOI 10.1111/j.1365-2591.2011.01920.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Influence of post system and remaining coronal tooth tissue on biomechanical behaviour of root filled molar teeth.

    Santana, F R / Castro, C G / Simamoto-Júnior, P C / Soares, P V / Quagliatto, P S / Estrela, C / Soares, C J

    International endodontic journal

    2011  Volume 44, Issue 5, Page(s) 386–394

    Abstract: Aim: To investigate ex vivo the influence of post system and amount of remaining coronal tooth tissue on the fracture resistance, fracture mode and strain of root filled molar teeth.: Methodology: Seventy mandibular human molar teeth were divided ... ...

    Abstract Aim: To investigate ex vivo the influence of post system and amount of remaining coronal tooth tissue on the fracture resistance, fracture mode and strain of root filled molar teeth.
    Methodology: Seventy mandibular human molar teeth were divided into seven groups (n = 10), one control (sound teeth) and six experimental groups resulting from the interaction between the two study factors: post system (Pa, post absence; Gfp, glass fibre post; Cmp, cast Ni-Cr alloy post and core) and amount of remaining coronal tooth tissue (Fe, 2 mm of ferrule; NFe, no ferrule). Teeth in the experimental groups were restored with metal crowns. For the strain gauge test, two strain gauges per sample were attached on the buccal and proximal root surfaces, and the samples of each group (n = 5) were submitted to a load of 0-100N. Fracture resistance (N) was assessed in a mechanical testing device (n = 10). Strain gauge and fracture resistance data were analysed by two-way anova (3 × 2) followed by the Tukey's HSD and Duncan's test (α = 0.05). The failure mode was evaluated using an optical stereomicroscope and classified according to the location of the failure.
    Results: The absence of ferrule was associated with lower fracture resistance regardless of the post system. Groups restored with glass fibre post and cast Ni-Cr alloy post and core had similar fracture resistance and higher values than groups without posts, regardless of the remaining coronal tooth tissue. Teeth with no ferrule and cast Ni-Cr alloy post and core resulted in catastrophic fractures and those with no ferrule and glass fibre post or no ferrule and post absence resulted in restorable failures. Buccal strain was higher in sound teeth and lower in teeth without posts. Glass fibre post insertion decreased the buccal strain compared to the teeth with ferrule and absence of post.
    Conclusions: Two millimetre of ferrule had a significant influence on cusp strain, fracture resistance and failure mode. The glass fibre post was as effective as the cast Ni-Cr alloy post and core in the restoration of root filled molars regardless of the remaining tooth tissue. Absence of a post decreased the fracture resistance and increased the cusp strain.
    MeSH term(s) Biomechanical Phenomena ; Dental Alloys ; Dental Prosthesis Design ; Dental Restoration Failure ; Dental Stress Analysis ; Glass ; Humans ; Mandible ; Molar ; Post and Core Technique/instrumentation ; Root Canal Therapy/instrumentation ; Root Canal Therapy/methods ; Stress, Mechanical ; Tooth Crown/pathology ; Tooth Fractures/prevention & control
    Chemical Substances Dental Alloys ; fiberglass
    Language English
    Publishing date 2011-05
    Publishing country England
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 603734-3
    ISSN 1365-2591 ; 0143-2885
    ISSN (online) 1365-2591
    ISSN 0143-2885
    DOI 10.1111/j.1365-2591.2010.01807.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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