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Comparison of distance of upper central incisor root and incisive canal in different sagittal and vertical skeletal patterns and sex: A retrospective CBCT study.

Int Orthod 2021 Jul 23. Epub 2021 Jul 23.

Department of Oral Radiology, Division of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba Piracicaba, SP, Brazil.

Introduction: To evaluate the influence of sagittal and vertical skeletal patterns (skeletal classes and facial profiles), and sex on the distance between upper central incisors roots and incisive canal.

Material And Methods: Cone-beam computed tomography exams of 172 patients were classified into skeletal classes I, II, and III and according to the facial profile into mesofacial, brachyfacial, and dolichofacial. In sagittal reconstructions, linear measurements were done between central incisors roots and incisive canal at three levels: incisive foramen opening, intermediate region, and the region close to the apex of upper central incisors. Read More

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Risk Factors for Complications Following Lateral Skull Base Surgery and the Utility of ICU Monitoring.

Otol Neurotol 2021 Jul 23. Epub 2021 Jul 23.

Department of Neurotology, Michigan Ear Institute, St. John Providence Hospital and Medical Centers, Farmington Hills Department of Otolaryngology-Head & Neck Surgery, Wake Forest University School of Medicine, Winston-Salem, North Carolina Department of Otolaryngology-Head and Neck Surgery, Ascension Macomb-Oakland Hospital, Madison Heights Michigan State University College of Osteopathic Medicine, East Lansing, Michigan.

Objective: To examine the role of intensive care unit (ICU) management following lateral skull base surgery for vestibular schwannoma and identify risk factors for complications warranting admission to the ICU.

Study Design: Retrospective review.

Setting: Tertiary referral center. Read More

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A cross-cultural exploratory analysis of pandemic growth: The case of COVID-19.

J Int Bus Stud 2021 Jul 21:1-22. Epub 2021 Jul 21.

Department of Management Programs, College of Business, Florida Atlantic University, Boca Raton, FL 33431 USA.

Although the novel coronavirus that has resulted in more than 3 million deaths and 140 million cases of infection worldwide has wreaked havoc globally, some nations were more successful than others in curbing growth in their number of cases, thereby saving lives. In this research note, we integrate insights from cross-cultural research with inquiry in social psychology and public health literatures to advance a theoretically grounded and culturally derived explanation of cross-national variance in the growth rate of COVID-19. Our multi-level analyses, based on longitudinal time series data from 107 nations, and focused on the first 91 days of this pandemic in different nations, illustrate the direct and interactive effects of culture. Read More

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Influence of two carbodiimides on the bond strength of universal adhesives to dentin.

Odontology 2021 Jul 19. Epub 2021 Jul 19.

School of Health Sciences, Graduate Program in Dentistry, Universidade Positivo, Rua Prof. Pedro Viriato Parigot de Souza, 5300, Curitiba, PR, 81280-330, Brazil.

The pretreatment of dentin with cross-linking agents during bonding procedures has been proposed to improve the mechanical properties of the collagen in the hybrid layer and reduce the biodegradation of the adhesive interface. The aim of this study was to evaluate the influence of pretreatment with two carbodiimides on the dentin bond strength of universal adhesives, after thermocycling. Three universal adhesives in the self-etching mode were used (Single Bond Universal-SBU, Clearfil Universal-CLU and Ambar Universal-ABU). Read More

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Effect of Surface Moisture on Bur-cut Dentin on Bonding of HEMA-free and HEMA-containing Universal Adhesives with or without Methacrylamide Monomer.

J Adhes Dent 2021 Jul;23(4):327-334

Purpose: The effect of surface moisture on bur-cut dentin on the microtensile bond strength (μTBS) of universal adhesives with various contents of 2-hydroxyethyl methacrylate (HEMA) and methacrylamide monomers was evaluated.

Materials And Methods: Flat mid-coronal dentin surfaces of human molars were exposed, and a standardized smear layer was prepared using a fine-grit diamond bur. The surfaces were either left wet or air dried for 10 s before bonding with Clearfil Universal Bond Quick (UBQ), experimental UBQ without an amide monomer (UBQexp), Scotchbond Universal (SBU), Prime&Bond Universal (PBU), or BeautiBond Universal (BBU). Read More

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Effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations.

Binting Xu

J Esthet Restor Dent 2021 Jul 13. Epub 2021 Jul 13.

Attending Physician, College of Stomatology, Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, China.

Objective: To investigate the effects of dentin and enamel porcelain layer thickness on the color of various ceramic restorations.

Materials And Methods: Eighty specimens (shade A2 and A3, n = 10) (20 mm in length, 4 mm in width, 1.5 mm in thickness respectively) of casting ceramic (EM); alumina ceramic (AL); zirconia ceramic (ZR); and porcelain-fused-metal (PFM) were prepared. Read More

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Characterization of Reinforced and Unreinforced Glass-Ceramic Veneers.

Oper Dent 2021 Jul 12. Epub 2021 Jul 12.

This study aimed to characterize the surface topography, effect of polishing on surface roughness, residual stresses, and hardness in two glass-ceramic veneers. Fifty-two (52) upper incisors were collected, prepared, and scanned for ceramic veneers. Half of the teeth were restored with veneers made up of feldspathic ceramic (FE), and the other half with zirconia-reinforced lithium silicate ceramic (SZ). Read More

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Effect of accelerated aging and double application on the dentin bond strength of universal adhesive system.

Dent Res J (Isfahan) 2021 6;18:25. Epub 2021 Apr 6.

Department of Restorative Dentistry, Dental Faculty, Urmia University of Medical Sciences, Urmia, Iran.

Background: Despite the many advantages of simplified adhesive systems, there are concerns about the durability of the adhesive layer over time. The aim was to investigate the effects of various aging methods and double application of an adhesive layer on the bond strength of the universal adhesive system using etch-and-rinse (ER) and self-etch (SE) strategies.

Materials And Methods: In this study, the occlusal enamel of 120 extracted, intact human third molars was removed to expose the dentin. Read More

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Colour agreement between try-in paste and resin cement: effect of background on zirconia-reinforced lithium silicate.

Aust Dent J 2021 Jul 1. Epub 2021 Jul 1.

School of Dentistry, Department of Prosthodontics, Usak University, Usak, Turkey.

Purpose: To investigate colour agreement between different shades of Panavia V5 resin cement and their try-in pastes under zirconia-reinforced lithium silicate ceramics.

Methods: Forty-four zirconia-reinforced lithium silicate ceramic specimens were prepared at 0.8 ± 0. Read More

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Module-Based Arthroscopic Knee Simulator Training Improves Technical Skills in Naive Learners: A Randomized Trial.

Arthrosc Sports Med Rehabil 2021 Jun 14;3(3):e757-e764. Epub 2021 May 14.

University of Manitoba, Pan Am Clinic Foundation, Winnipeg.

Purpose: To compare the effectiveness, in comparison to a control group (C), of module-based training (MBT) and traditional learning (TL) as a means of acquiring arthroscopic skills on an arthroscopic surgery simulator.

Methods: Thirty health sciences students with no previous arthroscopy experience were recruited and randomized into 1 of 3 groups: MBT, TL, or C (1:1:1 ratio). Participants in MBT were required to independently practice on a VirtaMed ArthroS simulator (VirtaMed AG, Zurich, Switzerland) for a minimum of 2 hours per week, whereas TL received one-on-one coaching by a senior orthopaedic resident for 15 minutes per week. Read More

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Managing cassava growth on nutrient poor soils under different water stress conditions.

Heliyon 2021 Jun 16;7(6):e07331. Epub 2021 Jun 16.

Roots and Tubers Department, Naliendele Agricultural Research Institute, Mtwara, Tanzania.

Nitrogen (N), phosphorus (P) and potassium (K) fertiliser application, was able to counteract growth reductions, in cassava cultivated on nutrient poor soils, under one water stress condition. It however remains to be seen, whether N, P and K fertiliser application, would produce similar results, across different water stress conditions. A study was therefore conducted to determine how N, P and K fertiliser application, would influence cassava growth on nutrient poor soils, under various water stress conditions. Read More

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Trait variations and expression profiling of OsPHT1 gene family at the early growth-stages under phosphorus-limited conditions.

Sci Rep 2021 Jun 30;11(1):13563. Epub 2021 Jun 30.

Rice Breeding Platform, International Rice Research Institute (IRRI), Los Baños, Laguna, 4031, Philippines.

To better understand the early response of genotypes to limited-phosphorus (P) conditions and the role of the phosphate transporter OsPHT1 gene family in the presence of PSTOL1, it is essential to characterize the level of tolerance in rice under limited-P conditions. In the present experiment, six rice genotypes were studied in three-way interactions [genotype (G) × phosphorus (P) × duration (D)] by comparing them at two instances (14 d and 28 d) under seven different concentrations of P (0.5‒10. Read More

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Spatio-temporal temperature fields generated coronally with bulk-fill resin composites: A thermography study.

Dent Mater 2021 08 16;37(8):1237-1247. Epub 2021 Jun 16.

Dentistry, School of Medical Sciences, University of Manchester, Manchester, UK; Photon Science Institute, University of Manchester, Manchester, UK. Electronic address:

Objective: This study aimed to investigate the effects of (i) a high-irradiance (3s) light-curing protocol versus (ii) two standard-irradiance (10s) protocols on 2D temperature maps during intra-dental photo-irradiation within a molar cavity restored with either Ultra-Rapid Photo-Polymerized Bulk Fill (URPBF) composites or a pre-heated thermo-viscous bulk-fill composite, compared to a standard bulk-fill resin-based-composite (RBC). The specific objectives included visual assessment of the temperature maps and quantitative assessment of several temperature/time plots at four different locations.

Methods: A caries-free lower first molar cavity served as a natural tooth mold. Read More

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Effect of Root Dentin Pretreatment on Micro-Push-Out Bond Strength of Fiber Posts to Root Canal Dentin: Cold Atmospheric Argon Plasma (CAAP) and Ethylenediaminetetraacetic Acid (EDTA).

Int J Dent 2021 28;2021:5571480. Epub 2021 May 28.

Dental Research Center, Dentistry Research Institute, Tehran University of Medical Science, Tehran, Iran.

Purpose: Debonding from the root canal dentin is the most common failure mode of fiber posts. This study aimed to assess the effects of cold atmospheric argon plasma (CAAP) and ethylenediaminetetraacetic acid (EDTA) on micro-push-out bond strength of fiber posts to root canal dentin.

Materials And Methods: Forty maxillary canine teeth were decoronated, underwent endodontic treatment, and were stored in an incubator for 7 days. Read More

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Firmicutes Levels in the Mouth Reflect the Gut Condition With Respect to Obesity and Early Childhood Caries.

Front Cell Infect Microbiol 2021 27;11:593734. Epub 2021 May 27.

Laboratory of Clinical and Molecular Microbiology, University São Francisco, Bragança Paulista, Brazil.

The present cross-sectional study investigated whether Firmicutes (F) and Bacteroidetes (B) levels in the mouth reflected the gut condition in obesity and early childhood caries (ECC). Eighty preschoolers (3-5 years) were equally assigned into four groups: 1. obese + ECC, 2. Read More

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Variance components of ratings of physician-patient communication: A generalizability theory analysis.

PLoS One 2021 10;16(6):e0252968. Epub 2021 Jun 10.

Department of Research Methods, Freiburg University of Education, Freiburg, Germany.

Background: The ratings of physician-patient communication are an important indicator of the quality of health care delivery and provide guidance for many important decisions in the health care setting and in health research. But there is no gold standard to assess physician-patient communication. Thus, depending on the specific measurement condition, multiple sources of variance may contribute to the total score variance of ratings of physician-patient communication. Read More

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Self-etch Approach of Universal Adhesives as an Alternative to Minimize Bond Degradation on Sound Dentin vs Caries-affected Dentin over Time.

J Adhes Dent 2021 Jun;23(3):243-252

Purpose: To investigate the influence of the etching strategy of universal adhesives on bond degradation to sound and artificially-induced caries-affected dentin.

Materials And Methods: The universal adhesives (Scotchbond Universal Adhesive; All-Bond Universal; Prime&Bond Elect) and adhesives used as controls (Adper Single Bond 2 and Clearfil SE Bond) were applied to sound and artificially-induced caries-affected bovine dentin. Microtensile bond strength was evaluated immediately (24 h) and after one year of water storage (1 year). Read More

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Effect of Neck Strength on Simulated Head Impacts During Falls in Female Ice Hockey Players.

Int J Exerc Sci 2021 1;14(1):446-461. Epub 2021 Apr 1.

School of Kinesiology, Lakehead University, Thunder Bay, ON, CANADA.

This study examined the effect of isometric cervical strength and impact location of the hockey helmet in mitigating the risk of concussions for two different mechanisms of injury from a fall during head impact simulation testing. Isometric cervical strength was measured on 25 female hockey players to compute and model neck strength on a mechanical neckform. A dual-rail vertical drop system with a helmet mounted on a surrogate headform simulated the mechanisms of injury causing concussions on female ice hockey players. Read More

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Push-Out Bond Strength, Characterization, and Ion Release of Premixed and Powder-Liquid Bioceramic Sealers with or without Gutta-Percha.

Scanning 2021 6;2021:6617930. Epub 2021 May 6.

Department of Restorative Sciences, University of Costa Rica, Montes de Oca, San José 11502, Costa Rica.

Objective: To evaluate the push-out bond strength of premixed and powder-liquid bioceramic sealers with or without gutta-percha (GP) cone.

Materials And Methods: Radicular dentin samples were prepared from 80 single-rooted human teeth. After root canal preparation using ProTaper® and irrigation with NaOCl and EDTA, teeth were divided according to the root canal sealer ( = 20): AH Plus®, EndoSequence® BC Sealer™, ProRoot® Endo Sealer, and BioRoot™ RCS. Read More

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Dentin Cross-linking Effect of Carbodiimide After 5 Years.

J Dent Res 2021 May 19:220345211014799. Epub 2021 May 19.

Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, Italy.

Carbodiimide (EDC)-based dentin primers preserve hybrid layer (HL) integrity. However, aging >1 y has not been investigated. The present study examined whether the cross-linking effect of EDC was reflected in dentin bond strength, endogenous enzymatic activity, and the chemical profile of the HL after 5-y aging in artificial saliva. Read More

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Biosorption of organic dye Acridine orange from aqueous solution using dry biomass of Bacillus cereus M.

Arch Microbiol 2021 May 17. Epub 2021 May 17.

Department of Biochemistry, University of Calcutta, 35 Ballygunge Circular Road, Kolkata, 700019, India.

Acridine orange (AO), a basic carcinogenic fluorochrome dye, is used in the industry for staining. In this study, Gram-positive bacteria, Bacillus cereus M (MTCC 5521) dry biomass was tested as an eco-friendly, easily available, and cheap biosorbent for the AO dye removal. We obtained optimum biosorption of AO at a biomass concentration of 0. Read More

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Evaluating the effect of repeated use of milling burs on surface roughness and adaptation of digitally fabricated ceramic veneers.

Heliyon 2021 Apr 30;7(4):e06896. Epub 2021 Apr 30.

Dental Research Center, Dental Implant Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran.

Objectives: This study aimed to evaluate how repeated use of milling diamond burs with different coarseness affects surface roughness, and marginal and internal adaptation of CAD/CAM veneers.

Methods: Forty leucite-reinforced glass-ceramic veneers were milled in 2 groups based on the milling mode (with fine or extra-fine bur sets). In each group, every 10 veneers were milled with a new bur set. Read More

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Perceptual Asymmetries and Auditory Processing of Estonian Quantities.

Front Hum Neurosci 2021 28;15:612617. Epub 2021 Apr 28.

Institute of Psychology, University of Tartu, Tartu, Estonia.

Similar to visual perception, auditory perception also has a clearly described "pop-out" effect, where an element with some extra feature is easier to detect among elements without an extra feature. This phenomenon is better known as auditory perceptual asymmetry. We investigated such asymmetry between shorter or longer duration, and level or falling of pitch of linguistic stimuli that carry a meaning in one language (Estonian), but not in another (Russian). Read More

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Effect of epigallocatechin-3-gallate and thermal cycling on the bond strength of resin cements to the root dentin.

Odontology 2021 May 8. Epub 2021 May 8.

School of Dentistry, University of Ribeirão Preto, Avenida Costábile Romano, 2201-Ribeirânia, Ribeirão Prêto, Sao Paulo, 14096-000, Brazil.

This study evaluated the effect of epigallocatechin-3-gallate (EGCG) solution and thermal cycling on the bond strength (BS) of fiber posts to the root dentin using two different resin cements (conventional or self-adhesive). One hundred and forty-four bovine roots were endodontically treated. After post space preparation, specimens were randomly divided into six groups (n = 24) according to dentin pretreatment [distilled water, 0. Read More

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The effect of different storage media on the monomer elution and hardness of CAD/CAM composite blocks.

Dent Mater 2021 07 4;37(7):1202-1213. Epub 2021 May 4.

Dentistry, School of Medical Sciences, The University of Manchester, Manchester, UK. Electronic address:

Objective: This study aimed to assess the effect of different storage media on the hardness and monomer elution of CAD/CAM composite blocks.

Methods: Five resin-composite blocks (RCB), one polymer-infiltrated ceramic network (PICN) block (Enamic (EN)), one ceramic-filled poly ether ether ketone (PEEK) block (Dentokeep (DK)), and one feldspathic ceramic block. Microhardness was measured using a Vickers indenter tester (FM-700, Future Tech Corp. Read More

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The Impact of Surgical Guide Fixation and Implant Location on Accuracy of Static Computer-Assisted Implant Surgery.

J Prosthodont 2021 Apr 27. Epub 2021 Apr 27.

Department of Biological and Material Sciences & Prosthodontics, University of Michigan School of Dentistry, Ann Arbor, MI, USA.

Purpose: To evaluate the accuracy of static computer-assisted implant surgery (sCAIS) for tooth-supported free-end dental implantation with the aid/and without the aid of fixation pins to secure the surgical template through comparison between planned, 3D printed guide position and placement implant position.

Materials And Methods: Thirty-two duplicated maxillary resin models were used in the present in vitro study. Digital planning was performed and fabrication of a surgical template that allowed implant placement on the distal extension edentulous site of the model (maxillary left side). Read More

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Effect of Arm Eccentric Exercise on Muscle Damage of the Knee Flexors After High-Intensity Eccentric Exercise.

Front Physiol 2021 8;12:661618. Epub 2021 Apr 8.

Department of Health, Exercise, and Recreation Management, University of Mississippi, University City, MO, United States.

Repeated bout effect (RBE) describes a phenomenon that an initial unaccustomed eccentric exercise (ECC) bout can confer a protective effect against muscle damage from the subsequent same exercise. This protection has been observed in the same muscle, as well as the contralateral homologous (CL-RBE) muscle. But it is unknown whether the RBE is evident for non-local unrelated heterogonous muscles. Read More

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Effect of argon plasma on repair bond strength using nanofilled and microhybrid composites.

J Esthet Restor Dent 2021 07 21;33(5):713-719. Epub 2021 Apr 21.

Dental Materials Division, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil.

Objectives: To evaluate the effect of atmospheric pressure plasma (PLA), sandblasting (SAN), silanization (SIL) and hydrophobic bonding resin (HBR) on the micro-shear bond strength (MSBS) of fresh nanofilled (NF) or microhybrid (MH) composites to water-aged nanofilled composite.

Materials And Methods: NF plates were fabricated and stored in distilled water for 4 months. The aged plates were assigned to the groups (n = 6): 1- untreated; 2- SAN + SIL + HBR; 3- HBR; 4- PLA + HBR; 5- SAN + HBR; 6- SAN + PLA + HBR; and 7- PLA. Read More

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Effects of camera viewing angles on tracking kinematic gait patterns using Azure Kinect, Kinect v2 and Orbbec Astra Pro v2.

Gait Posture 2021 Jun 5;87:19-26. Epub 2021 Apr 5.

Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong. Electronic address:

Background: Depth sensors could be a portable, affordable, marker-less alternative to three-dimension motion capture systems for gait analysis, but the effects of camera viewing angles on their joint angle tracking performance have not been fully investigated.

Research Questions: This study evaluated the accuracies of three depth sensors [Azure Kinect (AK); Kinect v2 (K2); Orbbec Astra (OA)] for tracking kinematic gait patterns during treadmill walking at five camera viewing angles (0°/22.5°/45°/67. Read More

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Does curing delay affect the bond strength of fiber post with self-adhesive cements?

Int J Prosthodont 2021 Apr 16. Epub 2021 Apr 16.

Purpose: To evaluate the effect of three different curing protocols based on different ratios between self-curing and light-curing periods on the bond strength and nanoleakage of fiber posts luted with dual-curing self-adhesive cements.

Materials And Methods: A total of 48 single-root teeth were endodontically treated and obturated, and an 8-mm post space was prepared with dedicated drills. Specimens were randomly divided into two groups according to the self-adhesive cement employed: G1 = PANAVIA SA Plus (Kuraray Noritake); and G2 = Bifix SE (VOCO). Read More

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