417 results match your criteria single bur

The complete chloroplast genome of .

Mitochondrial DNA B Resour 2021 Mar 11;6(3):745-747. Epub 2021 Mar 11.

Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China Ministry of Education, Southwest Forestry University, Kunming, China.

In this study, we reported and characterized the complete chloroplast genome sequence of . The chloroplast genome was determined to be 158,250 bp in length. It contained large single-copy (LSC) and small single-copy (SSC) regions of 84,929 bp and 12,663 bp, respectively, which were separated by a pair of 30,329 bp inverted repeat (IR) regions. Read More

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Telemedicine for head and neck cancer surveillance in the COVID-19 era: Promise and pitfalls.

Head Neck 2021 Mar 4. Epub 2021 Mar 4.

Department of Otolaryngology-Head and Neck Surgery, University of Kansas School of Medicine, Kansas City, Kansas, USA.

Background: The coronavirus disease 2019 pandemic has led to increased telemedicine visits. This study examines current preferences and barriers for telemedicine among patients with head and neck cancer.

Methods: Single institution retrospective analysis of 64 patients scheduling visits with the head and neck surgical oncology clinic at a tertiary academic medical center. Read More

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Evaluation of surface roughness after root resection: An optical profilometer study.

Microsc Res Tech 2021 Apr 25;84(4):828-836. Epub 2021 Jan 25.

Department of Endodontics, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.

The aim of this study was to evaluate the roughness of the apical surface after apical resection performed by six different methods with an optical profilometer. Sixty human single root premolar teeth were used in this in vitro study. After root canal preparation, root canals were filled with gutta-percha and AH Plus root canal sealers by lateral condensation technique. Read More

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Denoising for Improved Parametric MRI of the Kidney: Protocol for Nonlocal Means Filtering.

Methods Mol Biol 2021 ;2216:565-576

Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine (MDC) in the Helmholtz Association, Berlin, Germany.

In order to tackle the challenges caused by the variability in estimated MRI parameters (e.g., T* and T) due to low SNR a number of strategies can be followed. Read More

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A Comparative Analysis Regarding the Osseointegration of Immediate Loaded Implants Using Two Different Implant Site Preparations: Erbium:Yttrium-Aluminum-Garnet Laser Versus Surgical Conventional Way-An and Histological Animal Study.

Photobiomodul Photomed Laser Surg 2021 Jan 17;39(1):70-80. Epub 2020 Dec 17.

Department of Oral Rehabilitation and Dental Emergencies, School of Dental Medicine, "Victor Babeş" University of Medicine and Pharmacy, Timisoara, Romania.

The aim of the study is to evaluate the possibility of preparing the implant site using the erbium:yttrium-aluminum-garnet (Er:YAG) laser scanner prototype and to reduce and/or eliminate time between primary (mechanical) stability and secondary (biological) stability, looking to the immediate occlusal loading in a single implant. A prerequisite for successful osseointegration is the establishment of direct bone-to-implant contact without interposition of nonbone or connective tissue. In recent years, the use of laser radiation was presented as an alternative/adjunctive treatment for bone tissue ablation due to vaporization of the tissues in the absence of a smear layer. Read More

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January 2021

Scattering and phase-contrast X-ray methods reveal damage to glass fibers in endodontic posts following dental bur trimming.

Dent Mater 2021 02 11;37(2):201-211. Epub 2020 Dec 11.

Department of Operative and Preventive Dentistry, Charité Universitätsmedizin Berlin, Aßmannshauser Straße 4-6, 14197 Berlin, Germany. Electronic address:

Objectives: There is concern that the integrity of fiberglass dental posts may be affected by chairside trimming during treatment. We hypothesize that hard X-ray methods of phase contrast-enhanced micro-CT (PCE-CT) and synchrotron based X-ray refraction (SXRR) can reliably identify and help characterize the extent of damage.

Methods: Fiberglass posts were imaged both as manufactured and following trimming with a diamond bur. Read More

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February 2021

Restorative Alveolar Interface Management Combined With Tunnel Technique and Connective Tissue Graft: A Conservative Approach for Root Fracture Treatment.

Clin Adv Periodontics 2020 Nov 22. Epub 2020 Nov 22.

Department of Prosthodontics, Tufts University School of Dental Medicine, Boston, MA.

Introduction: The infringement of supracrestal tissue attachment by subgingival restorative margins, extensive caries, and root fractures, can compromise the periodontal health, resulting in inflammation and loss of periodontal supporting tissues. This report describes a case of a root fracture on the upper left central incisor that was successfully treated using a conservative approach, by applying the restorative alveolar interface (RAI) management combined with tunnel technique and a subepithelial connective tissue graft (SCTG).

Case Presentation: A 24-year-old male patient presented with a provisional single-unit fixed prosthesis on his upper left central incisor, in function for 4 years, with the chief complaint of prosthesis discoloration. Read More

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November 2020

The Effect of Root End Cavity Preparation Using Er,Cr:YSGG Laser, Ultrasonic Retrotip, and Bur on the Apical Microleakage of Retrograde Cavity Filled with MTA Plus.

J Pharm Bioallied Sci 2020 Aug 28;12(Suppl 1):S299-S303. Epub 2020 Aug 28.

Department of Prosthodontics, Yenepoya Dental College, Mangaluru, Karnataka, India.

Aim: The sealing ability of the retrograde material is greatly affected by the technique used for root end preparation. Advances in retrograde preparation techniques such as lasers has shown to provide an efficient outcome. The study was to evaluate and compare the effect of various techniques of retrograde cavity preparation on apical microleakage. Read More

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Soft Heteroleptic N-Heterocyclic Carbene Palladium(II) Species for Efficient Catalytic Routes to Alkynones via Carbonylative Sonogashira Coupling.

ACS Omega 2020 Sep 18;5(37):23687-23702. Epub 2020 Aug 18.

Chemistry Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.

,'-Substituted di-isopropyl (), benzyl-isopropyl (), and adamantyl-isopropyl () benzimidazolium salts react with palladium(II) bromide in pyridine to afford the corresponding -dibromidopyridinepalladium(II) complexes , , and in high yields. A distorted square planar geometry for and was confirmed by single-crystal X-ray diffraction. The palladium(II) complexes show a remarkably higher catalytic activity and selectivity, compared to the literature data, in carbonylative Sonogashira coupling reactions of aryl iodides and aryl diiodides with aryl alkynes, alkyl alkynes, and dialkynes. Read More

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September 2020

Development of a New Drill Design to Improve the Temperature Control during the Osteotomy for Dental Implants: A Comparative In Vitro Analysis.

Biology (Basel) 2020 Aug 6;9(8). Epub 2020 Aug 6.

Department of Medicine and Surgery, Faculty of Health Sciences, Rey Juan Carlos University, 28933 Madrid, Spain.

The present in vitro study evaluated a new drill design to improve the temperature control during the osteotomies for dental implant installation, comparing with two drill designs that use conventional external irrigation. Three blocks of synthetic cortical bone were used for osteotomy procedures. Three groups were created: control group 1 (Con1), where a conical multiple drill system with a conventional external irrigation system was used; control group 2 (Con2), where a single bur with a conventional external irrigation system was used; and, test group (Test), where the new single bur (turbo drill) with a new irrigation system was used. Read More

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A succinct technique for the extraction of the proximal femoral nail anti-rotation (PFNA) after unlocking failure: a case report.

J Orthop Surg Res 2020 Aug 6;15(1):300. Epub 2020 Aug 6.

Department of Orthopedics, The Fifth Affiliated Hospital of Sun Yat-Sen University, Zhuhai, 519000, Guangdong, China.

Introduction: Proximal femoral nail anti-rotation (PFNA) is a routine method to deal with intertrochanteric fractures in the elder population. It is challenging to remove PFNA in some cases as a result of stripping of blade heads. In this case presentation, we describe a novel technique using commonly available instruments that can be used to remove stripped, even broken anti-rotation blade where conventional methods have failed. Read More

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Evaluation of the repair capacities and color stabilities of a resin nanoceramic and hybrid CAD/CAM blocks.

J Adv Prosthodont 2020 Jun 18;12(3):140-149. Epub 2020 Jun 18.

Department of Restorative Dentistry, Faculty of Dentistry, Kırıkkale University, Kırıkkale, Turkey.

Purpose: This study evaluated the color stabilities of two computer-aided design and computer-aided manufacturing (CAD/CAM) blocks and a nanofill composite resin and the microtensile bond strength (µTBS) between the materials.

Materials And Methods: Twelve specimens of 4 mm height were prepared for both Lava Ultimate (L) and Vita Enamic (E) CAD/CAM blocks. Half of the specimens were thermocycled (10,000 cycle, 5° to 55℃) for each material. Read More

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Simultaneous single-trajectory endoscopic biopsy and third ventriculostomy in pediatric pineal region tumors.

Acta Neurol Belg 2020 Jun 6. Epub 2020 Jun 6.

Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100050, China.

Pineal region tumors have different pathological tumors and their optimal management remains controversial. Advancements in neuroendoscopy have led to the ability to simultaneously treat the hydrocephalus and obtain a tissue diagnosis. A retrospective review of 34 patients with pineal region tumors in Beijing Tiantan hospital from the year 2016 to 2018 was undertaken. Read More

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Subjective versus objective, polymer bur-based selective carious tissue removal: 1-year interim analysis of a randomized clinical trial.

Sci Rep 2020 06 4;10(1):9130. Epub 2020 Jun 4.

Department of Oral Diagnostics, Digital Health, Health Services Research, Charité- Universitätsmedizin, Berlin, Germany.

We aimed to compare subjective (S) vs. objective (O) selective carious tissue removal using hand-excavation versus a self-limiting polymer bur, respectively. A community-based single-blind cluster-randomized controlled superiority trial was performed. Read More

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Mental health among otolaryngology resident and attending physicians during the COVID-19 pandemic: National study.

Head Neck 2020 Jul 4;42(7):1597-1609. Epub 2020 Jun 4.

Department of Otorhinolaryngology-Head and Neck Surgery, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Background: Otolaryngologists are among the highest risk for COVID-19 exposure.

Methods: This is a cross-sectional, survey-based, national study evaluating academic otolaryngologists. Burnout, anxiety, distress, and depression were assessed by the single-item Mini-Z Burnout Assessment, 7-item Generalized Anxiety Disorder Scale, 15-item Impact of Event Scale, and 2-item Patient Health Questionnaire, respectively. Read More

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Developmental and sequenced one-to-one educational intervention (DS1-EI) for autism spectrum disorder and intellectual disability: a two-year interim report of a randomized single-blind multicenter controlled trial.

BMC Pediatr 2020 05 29;20(1):263. Epub 2020 May 29.

Institut des Systèmes Intelligents et de Robotiques, Sorbonne Université, 75005, Paris, France.

Background: Children with autism spectrum disorder (ASD) and moderate to severe intellectual disability (ID) face many challenges. There is little evidence-based research into educational settings for children with ID and ASD and in France. Little is known about how this unserved population could benefit from intervention and education. Read More

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Effects of Double Application of a Resin Cement Primer and Different Diamond Burs on Cement-Dentin Bond Strength.

J Adhes Dent 2020 ;22(3):311-320

Purpose: To evaluate the effects of double application of resin cement primers to dentin prepared with different diamond burs on the cement-dentin bond strengths.

Materials And Methods: Sixty flat dentin surfaces were prepared and divided into 12 groups (n = 5) according to three experimental factors: 1. resin cements: RelyX Ultimate (RU), Multilink Automix (ML), and Panavia V5 (PV); 2. Read More

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Effect of Different Surface Treatments of Resin Relined Fiber Posts Cemented With Self-adhesive Resin Cement on Push-out and Microtensile Bond Strength Tests.

Oper Dent 2020 Jul;45(4):E185-E195

Clinical Relevance: When luting relined fiber posts with self-adhesive cement, the surface treatment of the posts influences the adhesion of the fiber posts to root dentin.

Summary: This study evaluated the effect of surface treatment and silanization of resin composite on the bond strength of relined fiber posts cemented with self-adhesive resin cement. Push-out and microtensile bond strength (MTBS) tests were performed in this study. Read More

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A new milling unit for an efficient workflow.

Int J Comput Dent 2020 ;23(1):83-91

Aim: This article introduces a new milling unit (Cerec Primemill, Dentsply Sirona). Clinical cases show how this new milling unit functions to improve the overall workflow of single-visit chairside dentistry.

Materials And Methods: The unit has a touchscreen that guides the user through the process of setting up the manufacturing job. Read More

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Management of Instrument Sterilization Workflow in Endodontics: A Systematic Review and Meta-Analysis.

Int J Dent 2020 8;2020:5824369. Epub 2020 Feb 8.

Department of Clinical and Experimental Medicine, University of Foggia, Via Rovelli 50, 71122 Foggia, Italy.

Endodontic treatment consists of different working procedures, such as the isolation of the operating field, pulp chamber access, and cleaning and shaping phases with at last the need of a three-dimensional filling of the canals. Each step requires a series of single-use or sterilizable instruments. We have performed a systematic review of different sterilization and disinfection procedures aiming at drawing up a disinfection and sterilization procedure to be used on endodontic instruments. Read More

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February 2020

Spectral differentiation of oak wilt from foliar fungal disease and drought is correlated with physiological changes.

Tree Physiol 2020 03;40(3):377-390

Department of Ecology, Evolution and Behavior, University of Minnesota, 1479 Gortner Avenue Saint Paul, MN 55108, USA.

Hyperspectral reflectance tools have been used to detect multiple pathogens in agricultural settings and single sources of infection or broad declines in forest stands. However, differentiation of any one disease from other sources of tree stress is integral for stand and landscape-level applications in mixed species systems. We tested the ability of spectral models to differentiate oak wilt, a fatal disease in oaks caused by Bretziella fagacearum ``Bretz'', from among other mechanisms of decline. Read More

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Spectrophotometric analysis evaluating apical microleakage in retrograde filling using GIC, MTA and biodentine: an in-vitro study.

BMC Oral Health 2020 02 3;20(1):37. Epub 2020 Feb 3.

Department of Biochemistry, Universal College of Medical Sciences, Bhairahawa, Nepal.

Background: The present study compares the apical microleakage of three different root-end filling materials in which the retrograde cavity is prepared by two different burs.

Methods: Eighty extracted single rooted maxillary and mandibular premolars were taken. Root canal treatment was completed. Read More

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February 2020

Influence of Computer-aided Design/Computer-aided Manufacturing Diamond Bur Wear on Marginal Misfit of Two Lithium Disilicate Ceramic Systems.

Oper Dent 2020 Jul;45(4):416-425

Clinical Relevance: Marginal misfit of monolithic lithium disilicate ceramic crowns obtained from a chairside computer-aided design/computer-aided manufacturing system is affected after successive millings using a single diamond bur set. This fact can be critical for the longevity of indirect restorations.

Summary: Read More

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Evaluation of surface integrity of root end cavities prepared using conventional and piezoelectric devices: A scanning electron microscopy study.

Indian J Dent Res 2019 Sep-Oct;30(5):772-776

Department of Conservative Dentistry and Endodontics, A B Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India.

Introduction: An array of factors control the success of endodontic surgery. One of them is the technique used to prepare the root end cavities which is conventionally being done with burs. In past decades, ultrasonic instruments have been introduced for the same. Read More

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December 2019

Effect of Er:YAG laser cavity preparation on the bond strength of 2-hydroxyethyl methacrylate-free and 2-hydroxyethyl methacrylate-rich self-etch adhesive systems: An study.

Dent Res J (Isfahan) 2019 Nov-Dec;16(6):389-397. Epub 2019 Nov 12.

Department of Oral Pathology, Maharaja Ganga Singh Dental College and Research Centre, Sri Ganganagar, Rajasthan, India.

Background: Despite many advantages of lasers and reduction of the risk of surface bonding errors with newer self-etch systems, they have not been thoroughly researched. This study was done to evaluate the effect of Er:YAG laser cavity preparation on the microtensile bond strength of 2-hydroxyethyl methacrylate (HEMA)-rich and HEMA-free one-step self-etch adhesive systems.

Materials And Methods: In this study, eighty freshly extracted human premolars were collected. Read More

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November 2019

Effect of 17% ethylenediaminetetraacetic acid and 0.2% chitosan on pushout bond strength of biodentine and ProRoot mineral trioxide aggregate: An study.

J Conserv Dent 2019 Jul-Aug;22(4):387-390

Department of Conservative Dentistry and Endodontics, Sibar Institute of Dental Sciences, Guntur, Andhra Pradesh, India.

Aim: The purpose of this study was to evaluate the effect of 17% ethylenediaminetetraacetic acid (EDTA) and 0.2% chitosan on pushout bond strength of biodentine and ProRoot mineral trioxide aggregate (MTA).

Materials And Methods: Midroot dentin of single-rooted human canine teeth were sectioned into 2-mm-thick slices horizontally ( = 60). Read More

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December 2019

Optimized sampling for high resolution multi-pinhole brain SPECT with stationary detectors.

Phys Med Biol 2020 01 10;65(1):015002. Epub 2020 Jan 10.

Section Biomedical Imaging, Delft University of Technology, Delft, The Netherlands. Author to whom correspondence should be addressed.

Brain perfusion SPECT can be used in the diagnosis of various neurologic or psychiatric disorders, e.g. stroke, epilepsy, dementia and posttraumatic stress disorder. Read More

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January 2020

Cavity Preparation by Laser in Primary Teeth: Effect of 2 Levels of Energy Output on the Shear Bond Strength of Composite Restoration to Dentin.

J Lasers Med Sci 2019 6;10(3):235-240. Epub 2018 Jul 6.

Department of Restorative Dentistry, International Campus, Tehran University of Medical Sciences, Tehran, Iran.

One of the main applications of laser in dentistry is the removal of dental caries and preparation of restorative cavities. The morphology and wettability of laser prepared surfaces are different from that of those prepared with conventional method which may affect the quality of the adhesive potential of bonding agents in these surfaces. This study aimed to assess the shear bond strength of a total-etch and self-etch adhesive system to primary tooth dentin prepared by two different energy densities of Er:YAG laser in comparison with surfaces prepared by bur. Read More

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Intentional Replantation with a 2-segment Restoration Method to Treat Severe Palatogingival Grooves in the Maxillary Lateral Incisor: A Report of 3 Cases.

J Endod 2019 Dec 30;45(12):1543-1549. Epub 2019 Oct 30.

State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Key Laboratory of Oral Diseases, Department of Operative Dentistry and Endodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China. Electronic address:

The palatogingival groove is a developmental anomaly that typically starts near the cingulum of the maxillary incisors and extends along the roots at varying lengths and depths. Severe grooves that extend to the root apex often lead to complex combined periodontal-endodontic lesions. There are various therapeutic options available for these cases; however, the prognosis is unfavorable. Read More

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December 2019

Variable Smear Layer and Adhesive Application: The Pursuit of Clinical Relevance in Bond Strength Testing.

Int J Mol Sci 2019 Oct 29;20(21). Epub 2019 Oct 29.

Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.

The removal or modification of smear layers that cover the dentin is critical to allow the penetration of adhesive molecules and to ensure a strong bond between resin and dentin. Aiming to establish a model for clinically-relevant dentin-bond testing, we evaluated the effects of smear layers created by abrasives having similar coarseness (180-grit SiC paper; fine-grit diamond bur) and application modes (single application; double application) on the microtensile bond strengths (µTBS) of two currently available universal adhesives (G-Premio Bond; Scotchbond Universal Adhesive) and a two-step self-etch adhesive (Clearfil Megabond 2). Sixty extracted human third molars were used for the μTBS test. Read More

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October 2019