Effect of Acid Neutralization and Mechanical Cycling on the Microtensile Bond Strength of Glass-ceramic Inlays

Saavedra, Guilherme de Siqueira Ferreira Anzaloni; Ariki, Eurípedes Kaizo; Federico, C. D.; Galhano, Graziela Ávila Prãdo; Zamboni, Sandra Costa; Baldissara, Paolo; Bottino, Marco Antônio; Valandro, Luiz Felipe

doi:10.2341/08-68

Cited by 32 publications

(50 citation statements)

References 12 publications

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“…A similar observation was made by Magne and Cascione, who also demonstrated that these deposits could be partly removed with phosphoric acid . The purple deposits (Fig C) may result from the reaction between HF and the sodium bicarbonate contained in the neutralizing agent (NaHCO 3 + HF ⇔ NaF + <H 2 CO 3 >), or could be remnants of neutralizing medium (EtchArrest), considering the color of the medium used in this study is purple. The HF deposit neutralization has been shown to reduce the bond strength between dentin and glass‐ceramic .…”

Section: Discussionsupporting

confidence: 86%

Effects of Surface Treatments and Cement Types on the Bond Strength of Porcelain‐to‐Porcelain Repair

Mohamed

Finkelman

Zandparsa

et al. 2014

Journal of Prosthodontics

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Section: Discussionsupporting

confidence: 86%

Effects of Surface Treatments and Cement Types on the Bond Strength of Porcelain‐to‐Porcelain Repair

Mohamed

Finkelman

Zandparsa

et al. 2014

Journal of Prosthodontics

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“…The HF acid gel (either 9.5% or 5%) was applied for 20 seconds and rinsed with water for 60 seconds. They were then neutralized with the diluted solution of neutralizing powder (CaCO 3 and Na 2 CO 3 ) 29 and washed thoroughly for 20 seconds 27 with water and then airdried. Subsequently, the adhesive resin (ExciTE) was applied with a microbrush and photo-polymerized from a distance of 2 mm for 10 seconds using an LED photo-polymerization unit (Elipar Freelight 2, 3M ESPE, Seefeld, Germany) with a light intensity of 1000 mW/cm 2 .…”

Section: Surface Conditioning Methodsmentioning

confidence: 99%

Adhesion of Resin Composite to Hydrofluoric Acid-exposed Enamel and Dentin in Repair Protocols

Saracoglu¹,

Özcan

Kümbüloğlu³

et al. 2011

Operative Dentistry

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SUMMARY Intraoral repairs of ceramic fixed-dental-prostheses (FDP) often include cervical recessions that require pretreatment of the exposed tooth surfaces either before or after the ceramic is conditioned with hydrofluoric (HF) acid gel. The sequence of repair protocol may cross-contaminate the exposed etched enamel or dentin surfaces during the application or rinsing process and thereby affect the adhesion. This study evaluated the influence of HF acid gel with two concentrations on bond strengths of composite to enamel and dentin. Human third molars (N=100, n=10 per group) with similar sizes were selected and randomly divided into 10 groups. Flat surfaces of enamel and dentin were created by wet ground finishing. Before or after the enamel (E) or dentin (D) was conditioned with phosphoric acid (P), substrate surfaces were conditioned with either 9.5% HF (HF9.5) or 5% HF (HF5). Subsequently, a bonding agent (B) was applied. The experimental groups by conditioning sequence were as follows where the first letter of the group abbreviation represents the substrate (E or D) followed by the acid type and concentration: group 1 (EPHF9.5), group 2 (EPHF5), group 3 (EHF9.5P), group 4 (EHF5P), group 5 (DPHF9.5), group 6 (DPHF5), group 7 (DHF9.5P), and group 8 (DHF5P). Group 9 (EPB) and group 10 (DPB) acted as the control groups. Repair resin was adhered incrementally onto the conditioned enamel and dentin in polyethylene molds. Each layer was photo-polymerized for 40 seconds. All specimens were thermocycled (×1000, 5°-55°C) and subjected to shear test (universal testing machine, 1 mm/min). Specimens that debonded during thermocycling were considered as 0 MPa. The bond strength data were analyzed using Kruskal-Wallis test and failure types using the chi-square test (α=0.05). Overall, the bond results (MPa) were lower on dentin than on enamel (p<0.01). EPB (25.6 ± 6.6) and DPB (20.2 ± 4.9) control groups showed significantly higher results than those of other groups (p<0.05). While higher mean bond strengths were obtained in group 1 (EPHF9.5) (11.5 ± 2.1) and group 2 (EPHF5) (7.3 ± 0.6), lower results were obtained when HF acid gels were applied prior to phosphoric acid (EHF9.5P: 5.0 ± 1.1, EHF5P: 3.6 ± 0.1) (p<0.05). On dentin, the results were the lowest in group 8 (DHF5P: 1.5 ± 1.6), being significantly lower than those of group 5 (DPHF9.5) (p<0.05). Scanning electron microscope (SEM) images revealed predominantly mixed failures with less than half of the composite left on both enamel and dentin surfaces (64 out of 80) (p<0.05), indicating that in general, adhesion was not ideal. Contamination of the enamel or dentin surfaces with HF acid gel impairs the bond strength of composites. Considering both the bond strength results and failure types, when dental tissues are to be repaired next to ceramic, application of phosphoric acid before HF acid gel application can be recommended. HF acid gel concentration did not influence the results except on enamel.

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“…The pulpal and gingival walls were perpendicular to the long axis of the tooth and the buccal, axial, lingual and proximal boxes walls had an angulation of 12°. 25,26 …”

Section: Mod Cavity Preparationmentioning

confidence: 99%

Effects of Toothbrushing with Fluoride Abrasive and Whitening Dentifrices on Both Unbleached and Bleached Human Enamel Surface in Terms of Roughness and Hardness: An in vitro Study

Zamboni

Nogueira

Bottino

et al. 2012

The Journal of Contemporary Dental Practice

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Aim: This study assessed the effect of fatigue load cycling on human premolars restored with MOD restorations (direct and indirect approaches) on cuspal deflection, compared to intact teeth (unprepared) and unrestored teeth with an inlay preparation. Materials and methods:MOD inlay preparations were performed on sixty premolars with their roots embedded in acrylic resin. These teeth were divided into six groups (n = 10): (1) intact teeth; (2) unrestored and prepared teeth; (3) teeth restored with direct composite resin; (4) teeth restored with an indirect composite resin; (5) teeth restored with injected ceramic inlays (IPS Empress 2 (Ivoclar); (6) teeth restored with CAD/CAM inlays made of feldspathic ceramic (Vita Mark II). All of the indirect restorations were adhesively cemented. Strain-gauges were bonded to the buccal and lingual surfaces of the specimens. Compressive axial loading of 100N was applied on the occlusal face of the specimens to measure the cuspal deflection (microstrain) under compressive loading. These measurements were obtained before and after mechanical cycling (1 Hz, 37°C, 100,000x). Results:Comparing the results obtained before and after fatiguing, the cuspal deflection increased only in the CAD/CAM approach. The prepared tooth group had the highest cuspal deflection, before and after mechanical cycling. Conclusion:The evaluated restoring approaches decrease the cuspal deflection, consequently appear to improve the cuspal reinforcement.

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Effect of Acid Neutralization and Mechanical Cycling on the Microtensile Bond Strength of Glass-ceramic Inlays

Cited by 32 publications

References 12 publications

Effects of Surface Treatments and Cement Types on the Bond Strength of Porcelain‐to‐Porcelain Repair

Effects of Surface Treatments and Cement Types on the Bond Strength of Porcelain‐to‐Porcelain Repair

Adhesion of Resin Composite to Hydrofluoric Acid-exposed Enamel and Dentin in Repair Protocols

Effects of Toothbrushing with Fluoride Abrasive and Whitening Dentifrices on Both Unbleached and Bleached Human Enamel Surface in Terms of Roughness and Hardness: An in vitro Study

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