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Effect of different surface treatment on the repair bond strength of feldspathic porcelain.

Dent Med Probl 2021 Jan-Mar;58(1):107-113

Department of Restorative Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Background: Considering the use of silane-containing universal adhesives to enhance the repair bond strength of porcelain restorations, a question arises whether the application of these adhesives eliminates the need for a separate application of silane or not.

Objectives: This study aimed to assess the effect of various kinds of surface treatment, including hydrofluoric acid (HF) etching, the application of bis-silane and the use of universal adhesives, on the repair bond strength of feldspathic porcelain.

Material And Methods: In this experimental in vitro study, 70 porcelain disks were fabricated and divided into 7 groups (n = 10) for the following types of surface treatment: C (control group) - HF etching + silane + Porcelain Bond; HSB - HF etching + Single Bond; HSSB - HF etching + silane + Single Bond; HAB - HF etching + All Bond; HSAB - HF etching + silane + All Bond; HFB - HF etching + FuturaBond®; and HSFB - HF etching + silane + FuturaBond. Read More

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Biomechanical and biochemical evaluation of the effect of systemic application of omeprazole on the osseointegration of titanium implants.

Int J Implant Dent 2021 Apr 12;7(1):27. Epub 2021 Apr 12.

Department of Plastic-Reconstructive & Esthetic Surgery, Faculty of Medicine, Firat University, Elazig, Turkey.

Background: This study aimed to investigate the effects of systemic omeprazole treatment on the osseointegration of titanium implants.

Material And Methods: After surgical insertion of titanium implants into the metaphyseal part of rats' both right and left tibial bones, the animals were randomly divided into three equal groups: control (n = 8), omeprazole dosage-1 (n = 8) (OME-1), and omeprazole dosage-2 (n = 8) (OME-2) and totally 48 implants were surgically integrated. The rats in the control group received no treatment during the four-week postoperative experimental period. Read More

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Minimal intervention in dentistry: which is the best approach for silorane composite restoration repairs?

J Clin Exp Dent 2021 Apr 1;13(4):e357-e362. Epub 2021 Apr 1.

DDS, Ms, PhD. Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University-UNESP, São Paulo, Brazil.

Background: This study aimed to evaluate surface treatments, adhesives and composites for repairing silorane based restorations.

Material And Methods: One hundred and twenty truncated cones (2 mm smaller diameter and 4 mm larger diameter) made of silorane composite were divided in 12 groups according with the surface treatment (diamond bur and oxide aluminum abrasion), the adhesive (Adper Scothbond Multipurpose (3M ESPE), Ecusit (Voco) and Filtek P90 Adhesive (3M ESPE)). Each group was subdivided in two according with the composite used for repair (methacrylate and silorane). Read More

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Evaluation of dietary behaviors of preschool children in Seoul and Gyeonggi-do associated with the level of parents' health consciousness: using nutrition quotient for preschoolers (NQ-P).

Nutr Res Pract 2021 Apr 23;15(2):248-265. Epub 2020 Nov 23.

Department of Foodservice Industry, Hanyang Women's University, Seoul 04763, Korea.

Background/objectives: This study aimed to assess the dietary behaviors of preschool children using the nutrition quotient for preschoolers (NQ-P) and analyzed the difference in the scores of the children's dietary behaviors in regards to the parents' health consciousness.

Subjects/methods: The subjects were 257 children aged 3-5 years and their parents residing in Seoul and Gyeonggi-do, South Korea. The questionnaire is composed of demographic characteristics, the NQ-P questions, and health consciousness. Read More

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Long-term color stability of light-polymerized resin luting agents in different beverages.

J Prosthodont Res 2021 Apr 9. Epub 2021 Apr 9.

Department of Crown and Bridge, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo.

Purpose: The purpose of this study was to evaluate the long-term color stability of light-polymerized resin luting agents stored in different beverages.

Methods: Eleven shades of two light-polymerized resin luting agents, Choice2 (A1, A2, B1, TRANSLUCENT, MILKY OPAQUE, and MILKY BRIGHT) and BeautiCem Veneer (H-Value, M-Value, L-Value, Ivory-D, Ivory-L) were selected in this study. Disk-shaped specimens were fabricated with 1. Read More

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Prevention of non-cavitated lesions with fluoride and xylitol varnishes during orthodontic treatment: a randomized clinical trial.

Clin Oral Investig 2021 Apr 9. Epub 2021 Apr 9.

Bauru Dental School and Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, SP, 17012-901, Brazil.

Objective: Fixed orthodontic appliances impair oral hygiene increasing the risk of non-cavitated lesions (NCLs) and tooth decay. The aim of this study was to compare the outcomes of fluoride and xylitol varnishes in preventing NCLs during comprehensive orthodontic treatment.

Materials And Methods: The sample comprised 55 volunteers from 15 to 20 years of age under orthodontic treatment that were randomly divided into three groups: Fluoride Group (FG; n=17), Xylitol Group (XG; n=19), and Placebo Group (PG; n=19). Read More

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Comparative evaluation of frictional resistance of extracoronal attachments of different designs and lengths in fixed partial denture: A finite element analysis.

J Indian Prosthodont Soc 2021 Jan-Mar;21(1):99-105

Department of Prosthodontics and Crown and Bridge, School of Dental Sciences, KIMS-DU, Karad, Maharashtra, India.

Aim: The purpose of the study was to evaluate the frictional resistance and the vertical force required to achieve the frictional resistance for different length and designs of extracoronal attachments used in fixed partial denture (FPD).

Setting And Design: Finite element analysis.

Materials And Methods: Four different designs and five different lengths (3 mm, 3. Read More

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Evaluation of microhardness and water sorption/solubility of dual-cure resin cement through monolithic zirconia in different shades.

J Indian Prosthodont Soc 2021 Jan-Mar;21(1):50-56

Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Aim: The objective is to evaluate the effect of shades of monolithic zirconia on the microhardness and sorption/solubility of the underlying two dual-cured resin types of cement.

Materials And Methods: Eighty samples of two dual-cured resin cement discs were polymerized under 60 monolithic zirconia discs in three shades and directly activated resin discs of cement were used as the control group (n = 10). After 24 h storage at 37°C in an incubator, Vickers microhardness and the sorption and solubility were measured. Read More

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Clinical and Antimicrobial Evaluation of Desf. Dental Varnish in Children: A Clinical Study.

Evid Based Complement Alternat Med 2021 25;2021:6647849. Epub 2021 Mar 25.

Federal University of Ceara, Fortaleza, Ceará, Brazil.

Background: The objective of this study was to evaluate the clinical and microbiological efficacies of () dental varnish in children at high risk of dental caries..

Methods: This is a longitudinal, randomized, controlled clinical trial. Read More

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Toughening and polymerization stress control in composites using thiourethane-treated fillers.

Sci Rep 2021 Apr 7;11(1):7638. Epub 2021 Apr 7.

Division of Biomaterials and Biomechanics, Department of Restorative Dentistry, Oregon Health & Science University, Portland, OR, USA.

Filler particle functionalization with thiourethane oligomers has been shown to increase fracture toughness and decrease polymerization stress in dental composites, though the mechanism is poorly understood. The aim of this study was to systematically characterize the effect of the type of filler surface functionalization on the physicochemical properties of experimental resin composites containing fillers of different size and volume fraction. Barium glass fillers (1, 3 and 10 µm) were functionalized with 2 wt% thiourethane-silane (TU-Sil) synthesized de novo and characterized by thermogravimetric analysis. Read More

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Nurses' attitudes towards families in neonatal units.

Rev Esc Enferm USP 2021 5;55:e03684. Epub 2021 Apr 5.

Universidade Federal de São Paulo, Escola Paulista de Enfermagem, Departamento de Enfermagem Pediátrica, São Paulo, SP, Brazil.

Objective: To analyze nurses' attitudes towards families of newborns hospitalized in neonatal units.

Method: This is a survey carried out in ten municipal hospitals in São Paulo. Two questionnaires were applied, one from the sociodemographic profile and the other from the characterization of neonatal units, and the Importância das Famílias nos Cuidados de Enfermagem - Atitudes dos Enfermeiros scale. Read More

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Association of Nd:YAG laser and calcium-phosphate desensitizing pastes on dentin permeability and tubule occlusion.

J Appl Oral Sci 2021 31;29:e20200736. Epub 2021 Mar 31.

Universidade de São Paulo, Instituto de Pesquisas Energéticas e Nucleares (IPEN/CNEM), São Paulo, SP, Brasil.

Objective: To evaluate the efficacy of Nd:YAG laser associated with calcium-phosphate desensitizing pastes on dentin permeability and tubule occlusion after erosive/abrasive challenges.

Methodology: Dentin specimens were exposed to 17% ethylene diamine tetra-acetic acid (EDTA) solution for 5 min and randomly allocated into five groups: G1, control (no treatment); G2, Nd:YAG laser (1 W, 10 Hz, 100 mJ, 85 J/cm2); G3, Laser + TeethmateTM Desensitizer; G4, Laser + Desensibilize Nano P; and G5, Laser+Nupro®. Specimens underwent a 5-day erosion-abrasion cycling. Read More

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Effect of Addition of Dimethyl Sulfoxide to Simplified Adhesives on Dentin Bond Durability after Three Years of Water Storage.

J Adhes Dent 2021 Apr;23(2):159-165

Purpose: To evaluate the effect of inclusion of two dimethyl sulfoxide (DMSO) concentrations in simplified etch-and-rinse adhesives on dentin bonding durability after three years of water storage.

Materials And Methods: Forty-two caries-free third molars were divided into six experimental groups (n = 7) according to the following factors: 1) adhesive (Adper Single Bond 2 [SB], 3M Oral Care; Prime&Bond 2.1 [PB], Dentsply Sirona); 2) concentration of DMSO (control group: 0. Read More

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Effect of Light-curing Unit Design and Mouth Opening on the Polymerization of Bulk-fill Resin-based Composite Restorations in Molars.

J Adhes Dent 2021 Apr;23(2):121-131

Purpose: This study evaluated the effect of the design of the light-curing unit (LCU) and mouth opening on the properties of bulk-fill resin-based composites (RBCs).

Materials And Methods: Eighty molars received a mesio-occlusal-distal preparation and were restored using two different bulk-fill RBCs, Opus Bulk Fill APS (FGM) and Filtek Bulk Fill One (3M Oral Care), using two different designs of LCU, straight (Valo Cordless [Ultradent]) and angled (Radii-Cal [SDI]). Two mouth openings of 25 and 45 mm at the incisors were used. Read More

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Surface roughness, plaque accumulation, and cytotoxicity of provisional restorative materials fabricated by different methods.

PLoS One 2021 5;16(4):e0249551. Epub 2021 Apr 5.

Department of Prosthodontics, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Fars, Iran.

Fabricating method may affect the surface properties and biological characteristics of provisional restorations. This study aimed to evaluate the surface roughness, plaque accumulation, and cytotoxicity of provisional restorative materials fabricated by the conventional, digital subtractive and additive methods. Sixty-six bar-shaped specimens (2×4×10 mm) were fabricated by using provisional restorative materials through the conventional, digital subtractive and additive methods (n = 22 per group). Read More

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Neuroanatomic Volume Differences in Tinnitus and Hearing Loss.

Laryngoscope 2021 Apr 3. Epub 2021 Apr 3.

Department of Otolaryngology-Head and Neck Surgery, University of California, San Francisco, California, U.S.A.

Objectives: To investigate neuroanatomic volume differences in tinnitus and hearing loss.

Study Design: Cross-sectional.

Methods: Sixteen regions of interest (ROIs) in adults (43 male, 29 female) were examined using 3Tesla structural magnetic resonance imaging in four cohorts: 1) tinnitus with moderate hearing loss (N = 31), 2) moderate hearing loss only (N = 15), 3) tinnitus with normal hearing (N = 17), and 4) normal hearing only (N = 13). Read More

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Stereolithography vs. Direct Light Processing for Rapid Manufacturing of Complete Denture Bases: An In Vitro Accuracy Analysis.

J Clin Med 2021 Mar 4;10(5). Epub 2021 Mar 4.

Department of Prosthodontics at the Centre of Dentistry, Oral Medicine and Maxillofacial Surgery with Dental School, Tuebingen University Hospital, Osianderstr. 2-8, 72076 Tübingen, Germany.

The topical literature lacks any comparison between stereolithography (SLA) and direct light processing (DLP) printing methods with regard to the accuracy of complete denture base fabrication, thereby utilizing materials certified for this purpose. In order to investigate this aspect, 15 denture bases were printed with SLA and DLP methods using three build angles: 0°, 45° and 90°. The dentures were digitalized using a laboratory scanner (D2000, 3Shape) and analyzed in analyzing software (Geomagic Control X, 3D systems). Read More

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Influence of Sequential CAD/CAM Milling on the Fitting Accuracy of Titanium Three-Unit Fixed Dental Prostheses.

Materials (Basel) 2021 Mar 13;14(6). Epub 2021 Mar 13.

Department of Biomaterials Science, College of Dentistry, Dankook University, 119 Dandaero, Cheonan 31116, Korea.

This study investigated the fitting accuracy of titanium alloy fixed dental prostheses (FDP) after sequential CAD/CAM (Computer Aided Design/Computer Aided Manufacturing) fabrication. A three-unit FDP model connecting mandibular second premolars and molars was prepared and scanned to fabricate titanium FDPs by CAD/CAM milling. A total of six FDPs were sequentially milled in one titanium alloy disk using a new set of burs every time (n = 4). Read More

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Characterization of Methacrylate-Based Resins Containing Methacryl-Polyhedral Oligomeric Silsesquioxanes (MA-POSS-8).

Materials (Basel) 2021 Mar 29;14(7). Epub 2021 Mar 29.

Department of Preventive Dentistry, Periodontology and Cariology, University Medical Center Göttingen, 37075 Göttingen, Germany.

The use of functionalized dental adhesives that might prevent degradation of the dentin hybrid layer has been proposed. The aim of the study was to characterize the physicochemical properties and the potential to induce mineral precipitation of methacrylate-based resins containing methacryl-functionalized polyhedral oligomeric silsesquioxane (MA-POSS-8). In total, six different compositions of resins based on bisphenol A glycerolate dimethacrylate (BisGMA, 40 to 60 wt. Read More

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Spectral analysis of severely overlapping spectra based on newly developed mathematical filtration techniques and ratio spectra manipulations: An application to the concurrent determination of dapoxetine and sildenafil in combined dosage form.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Mar 19;255:119715. Epub 2021 Mar 19.

Pharmaceutical Chemistry Department, Faculty of Pharmacy, Egyptian Russian University, Badr City, Cairo 11829, Egypt. Electronic address:

Background: Dapoxetine hydrochloride (DAP) and sildenafil citrate (SIL) have proven clinically effective in the treatment of comorbid conditions like erectile dysfunction and premature ejaculation. The analysis of DAP and SIL combinations represents a challenge because of the severe overlap of these compounds' spectra. Six newly developed methods were proven effective for resolving such a challenging overlap. Read More

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Aqueous Tuber Extracts of (Kotschy ex Schweinf.) Torre and Hillc. (Fabaceae). Possess Significant Antidiarrheal Activity and Spasmolytic Effect Possibly Mediated by Modulation of Nitrous Oxide System, Voltage-Gated Calcium Channels, and Muscarinic Receptors.

Front Pharmacol 2021 16;12:636879. Epub 2021 Mar 16.

Department of Medical Physiology, School of Medicine, University of Nairobi, Nairobi, Kenya.

(TFG) is used as an antidiarrheal traditional medicine in Western Kenya. This study aimed to investigate the antidiarrheal activity of its aqueous extracts and the putative mechanism (s) of action using Sprague-Dawley rats and New Zealand white rabbits respectively. The antidiarrheal effects of the extract were evaluated in castor oil-induced diarrhea, the castor oil-induced enteropooling, and phenol red gastric motility tests. Read More

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Upper airways after mandibular advancement orthognathic surgery: A 4-year follow-up.

Am J Orthod Dentofacial Orthop 2021 Mar 29. Epub 2021 Mar 29.

Araras Dental School, Fundação Hermínio Ometto, Araras, São Paulo, Brazil. Electronic address:

Introduction: The purpose of this study was to assess the stability of changes in the upper airways 4 years after orthognathic surgery in patients with skeletal Class II malocclusion.

Methods: A retrospective clinical study was conducted including 33 cone-beam computed tomography images from 11 patients (average age of 35.91 years) followed up longitudinally for 4 years. Read More

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Improved cephalic index following early cranial vault remodeling in patients with isolated nonsyndromic sagittal synostosis.

Neurosurg Focus 2021 Apr;50(4):E7

1Department of Neurosurgery, Karolinska University Hospital, Stockholm.

Objective: Isolated nonsyndromic sagittal synostosis (SS) is the most common form of craniosynostosis in children, accounting for approximately 60% of all craniosynostoses. The typical cranial measurement used to define and follow SS is the cephalic index (CI). Several surgical techniques have been suggested, but agreement on type and timing of surgery is lacking. Read More

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Comparative evaluation of the shear bond strength of ceramic brackets of three different base designs bonded to amalgam and composite restorations with different surface treatment.

Dent Med Probl 2021 Mar 31. Epub 2021 Mar 31.

Faculty of Dentistry, Tehran University of Medical Sciences, Iran.

Background: Nowadays, due to the increasing number of adult orthodontic applicants, who also have multiple dental restorations, it is important to have the ability to bond an orthodontic appliance to restoration surfaces.

Objectives: The aim of this paper was to determine the shear bond strength of ceramic brackets of 3 different base designs bonded to amalgam and composite restorations after using different surface treatment methods in vitro.

Material And Methods: In an in vitro study, the surfaces of 180 amalgam and composite specimens were prepared by using sandblasting and the erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser irradiation. Read More

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Effect of cetrimide 2% with and without photodynamic therapy to reduce Streptococcus mutans burden in dentinal carious lesions.

Lasers Med Sci 2021 Mar 31. Epub 2021 Mar 31.

Center for Life Sciences, Postgraduate Program in Health Sciences, PUC Campinas, Av. John Boyd Dunlop, s/n, Campinas, SP, 13034-685, Brazil.

To evaluate the use of cetrimide alone and combined with photodynamic therapy to reduce S. mutans burden in carious lesions. Sixty permanent third molars were sectioned and the coronal dentin exposed. Read More

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Influence of Photodynamic therapy and different gingival retraction agents on bond integrity of composite to dentin.

Authors:
Ahmed Almahdy

Photodiagnosis Photodyn Ther 2021 Mar 27:102269. Epub 2021 Mar 27.

Pediatric Dentistry and Orthodontic Department, College of Dentistry, King Saud University, Riyadh, Saudi Arabia. Electronic address:

Aim: The present study was undertaken to evaluate the influence of gingival retraction agents (Expasyl and Viscostat) and different conditioning methods (Total-etch, Self-etch, and PDT) on bond integrity of composite to dentin MATERIAL AND METHODS: One hundred and eighty, third molars were collected cleaned and disinfected in thymol solution. The specimens were rooted vertically up to cementoenamel junction within polyvinyl cylinders (PVC). Based on gingival retraction materials samples were divided into three groups (n = 60). Read More

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