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https://www.readbyqxmd.com/read/29905504/er-yag-laser-for-metal-and-ceramic-bracket-debonding-an-in-vitro-study-on-intrapulpal-temperature-sem-and-eds-analysis
#1
Kinga Grzech-Leśniak, Jacek Matys, Dorota Żmuda-Stawowiak, Krzysztof Mroczka, Marzena Dominiak, Aldo Brugnera Junior, Reinhard Gruber, Georgios E Romanos, Anton Sculean
OBJECTIVE: To evaluate the effects of bracket removal using an erbium laser on the pulp temperature and enamel surface. BACKGROUND: Removal of orthodontic brackets with conventional debonding pliers may result in enamel cracks. To avoid damage to the enamel surface and effectively remove metal or ceramic brackets, different types of lasers, such as Nd:YAG, CO2 , TM:YAP, diode laser, or Er:YAG, have been introduced for debonding. MATERIALS AND METHODS: A total of 55 brackets (n = 55; 20 metal and 35 ceramic ones) were bonded to 55 caries-free premolars extracted for orthodontic indications...
June 15, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29903563/ultrasound-in-dentistry-toward-a-future-of-radiation-free-imaging
#2
REVIEW
Husniye Demirturk Kocasarac, Christos Angelopoulos
Ultrasonography (US) is a noninvasive, nonionizing, inexpensive, and painless imaging tool proven to be a valuable diagnostic tool in soft tissue assessment that also shows promise for hard tissue evaluation in dentistry. US has been investigated for its capability to identify carious lesions, tooth fractures or cracks, periodontal bony defects, maxillofacial fractures, and more. It has been used as a diagnostic aid in temporomandibular disorders, implant dentistry, and to measure muscle and soft tissue thickness...
July 2018: Dental Clinics of North America
https://www.readbyqxmd.com/read/29903559/optical-coherence-tomography
#3
REVIEW
Rujuta A Katkar, Satyashankara Aditya Tadinada, Bennett T Amaechi, Daniel Fried
Optical coherence tomography (OCT) is a noninvasive diagnostic technique providing cross-sectional images of biologic structures based on the differences in tissue optical properties. OCT has been widely used in numerous clinical applications and is becoming popular as a promising technology in dentistry. Today, dental hard (tooth) and soft (hard palate mucosa and gingiva mucosa) tissues are visualized with OCT. With new developments in technology, the applications of OCT are being investigated in various fields in dentistry, such as to detect microleakage around restoration, tooth cracks/fractures, examination of periodontal tissues/pockets, early detection of oral cancerous tissues, and in endodontics for location of pulp canal...
July 2018: Dental Clinics of North America
https://www.readbyqxmd.com/read/29848855/cross-sectional-imaging-of-tooth-bonding-interface-after-thermal-stresses-and-mechanical-fracture
#4
Minh Nguyet Luong, Yasushi Shimada, Alireza Sadr, Masahiro Yoshiyama, Yasunori Sumi, Junji Tagami
This study determined the influence of thermocycling (TC) and flowable composite on microtensile bond strength (MTBS), crack formation and mechanical properties of the bonding interface using swept-source optical coherence tomography (SS-OCT) and nanoindentation. MTBS test beams prepared from human dentin bonded with self-etch adhesive and hybrid composite with or without flowable lining were aged for either 0 or 10,000 thermocycles, resulting in 4 groups of specimens according to the placement technique and TC (n=10)...
May 31, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/29807959/comparative-evaluation-of-fracture-strength-of-different-types-of-composite-core-build-up-materials-an-in-vitro-study
#5
Srinivasa Gowda, Dilip D Quadras, Shetty R Sesappa, G R Ramakrishna Maiya, Lalit Kumar, Dinraj Kulkarni, Nitu Mishra
AIM: The aim of the study was to evaluate the fracture strength of three types of composite core build-up materials. The objectives were to study and evaluate the fracture strength and type of fracture in composite core build-up in restoration of endodonti-cally treated teeth with or without a prefabricated metallic post. MATERIALS AND METHODS: A total of 60 freshly extracted mandibular premolars free of caries, cracks, or fractures were end-odontically treated and restored with composite core build-up with prefabricated metallic posts cemented with resin luting cement (group I) and without a post (group II)...
May 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29782890/novel-dental-adhesive-resin-with-crack-self-healing-antimicrobial-and-remineralization-properties
#6
Shichao Yue, Junling Wu, Qiang Zhang, Ke Zhang, Michael D Weir, Satoshi Imazato, Yuxing Bai, Hockin H K Xu
OBJECTIVES: Secondary caries at the tooth-restoration margins is a primary reason for restoration failure. Cracks at the margins lead to leakage which can trap bacteria, producing acids to cause caries. To date, there has been no report on developing an adhesive resin that has self-healing, antibacterial and remineralizing capabilities. The objectives of this study were to: (1) develop the first self-healing adhesive with antimicrobial and remineralizing capabilities, and (2) investigate the effects of incorporating microcapsules, dimethylaminohexadecyl methacrylate (DMAHDM) and nanoparticles of amorphous calcium phosphate (NACP) for the first time...
May 18, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29769755/automatic-quantification-framework-to-detect-cracks-in-teeth
#7
Hina Shah, Pablo Hernandez, Francois Budin, Deepak Chittajallu, Jean-Baptiste Vimort, Rick Walters, André Mol, Asma Khan, Beatriz Paniagua
Studies show that cracked teeth are the third most common cause for tooth loss in industrialized countries. If detected early and accurately, patients can retain their teeth for a longer time. Most cracks are not detected early because of the discontinuous symptoms and lack of good diagnostic tools. Currently used imaging modalities like Cone Beam Computed Tomography (CBCT) and intraoral radiography often have low sensitivity and do not show cracks clearly. This paper introduces a novel method that can detect, quantify, and localize cracks automatically in high resolution CBCT (hr-CBCT) scans of teeth using steerable wavelets and learning methods...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29691570/-outcome-of-one-visit-and-multiple-visit-root-canal-treatment-for-cracked-tooth-with-pulpitis-a-meta-analysis
#8
Wen Wang, Peng-Lai Wang, Ni-Na Xie, Cui Wu, Zong-Xiang Liu
PURPOSE: To compare the treatment effect between one-visit and multiple-visit endodontic treatment for cracked tooth with pulpitis. METHODS: The literatures published before 2016-06-01 regarding to one-visit and multiple-visit root canal treatment for cracked tooth with pulpitis were searched through MEDLINE, CNKI, VIP, Wanfang Database et al. Then the included studies were chosen according to the inclusion criteria. Collection of features, quality evaluation and analysis of treatment effect, follow-up results (half year/1 year) and postoperative pain of the included studies were analyzed using Stata/SE12...
December 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29689293/molar-cusp-deformation-evaluated-by-micro-ct-and-enamel-crack-formation-to-compare-incremental-and-bulk-filling-techniques
#9
Laís Rani Sales Oliveira, Stella Sueli Lourenço Braga, Aline Arêdes Bicalho, Maria Tereza Hordones Ribeiro, Richard Bengt Price, Carlos José Soares
OBJECTIVES: To describe a method of measuring the molar cusp deformation using micro-computed tomography (micro-CT), the propagation of enamel cracks using transillumination, and the effects of hygroscopic expansion after incremental and bulk-filling resin composite restorations. METHODS: Twenty human molars received standardized Class II mesio-occlusal-distal cavity preparations. They were restored with either a bulk-fill resin composite, X-tra fil (XTRA), or a conventional resin composite, Filtek Z100 (Z100)...
July 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29662047/mechanisms-and-fem-simulation-of-chip-formation-in-orthogonal-cutting-in-situ-tib%C3%A2-7050al-mmc
#10
Yifeng Xiong, Wenhu Wang, Ruisong Jiang, Kunyang Lin, Mingwei Shao
The in-situ TiB₂/7050Al composite is a new kind of Al-based metal matrix composite (MMC) with super properties, such as low density, improved strength, and wear resistance. This paper, for a deep insight into its cutting performance, involves a study of the chip formation process and finite element simulation during orthogonal cutting in-situ TiB₂/7050Al MMC. With chips, material properties, cutting forces, and tool geometry parameters, the Johnson-Cook (J-C) constitutive equation of in-situ TiB₂/7050Al composite was established...
April 15, 2018: Materials
https://www.readbyqxmd.com/read/29552361/diagnosis-and-managment-of-maxillary-incisor-with-vertical-root-fracture-a-clinical-report-with-three-year-follow-up
#11
Ines Kallel, Eya Moussaoui, Fadwa Chtioui, Nabiha Douki
According to the American Association of Endodontists, "a 'true' vertical root fracture is defined as a complete or incomplete fracture initiated from the root at any level, usually directed buccolingually." Vertical root fracture (VRF) usually starts from an internal dentinal crack and develops over time, due to masticatory forces and occlusal loads. When they occur in teeth, those types of fractures can present difficulties in diagnosis, and there are however many clinic and radiographical signs which can guide clinicians to the existence of the fracture...
2018: Case Reports in Dentistry
https://www.readbyqxmd.com/read/29532597/effects-of-ultrasonic-instrumentation-on-enamel-surfaces-with-various-defects
#12
S-Y Kim, M-K Kang, S-M Kang, H-E Kim
OBJECTIVE: The aim of this study was to analyse the enamel damage caused by ultrasonic scaling of teeth with various enamel conditions that are difficult to identify by visual inspection, such as enamel cracks, early caries and resin restorations. METHODS: In total, 120 tooth surfaces were divided into 4 experimental groups using a quantitative light-induced fluorescence-digital system: sound enamel group, enamel cracks group, early caries group and resin restoration group...
May 2018: International Journal of Dental Hygiene
https://www.readbyqxmd.com/read/29518806/clinical-evaluation-of-monolithic-zirconia-crowns-a-short-term-pilot-report
#13
Aki Kitaoka, Ryo Akatsuka, Hiroaki Kato, Nobuhiro Yoda, Keiichi Sasaki
PURPOSE: This study aimed to prospectively evaluate the clinical performance of monolithic zirconia crowns made of yttria-stabilized tetragonal zirconia polycrystal. MATERIALS AND METHODS: A total of 26 crowns placed on premolar or molar teeth in 18 patients were evaluated at the time of crown placement and at 2 weeks, 6 months, 1 year, and 2 years after placement. RESULTS: Twenty-five crowns rated as satisfactory according to the California Dental Association quality evaluation system...
March 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29517915/polylactic-acid-nanopillar-array-driven-osteogenic-differentiation-of-human-adipose-derived-stem-cells-determined-by-pillar-diameter
#14
Shan Zhang, Baojin Ma, Feng Liu, Jiazhi Duan, Shicai Wang, Jichuan Qiu, Dong Li, Yuanhua Sang, Chao Liu, Duo Liu, Hong Liu
Numerous studies have determined that physical cues, especially the nanotopography of materials, play key roles in directing stem cell differentiation. However, most research on nanoarrays for stem cell fate regulation is based on nonbiodegradable materials, such as silicon wafers, TiO2 , and poly(methyl methacrylate), which are rarely used as tissue engineering biomaterials. In this study, we prepared biodegradable polylactic acid (PLA) nanopillar arrays with different diameters but the same center-to-center distance using a series of anodic aluminum oxide nanowell arrays as templates...
April 11, 2018: Nano Letters
https://www.readbyqxmd.com/read/29432650/effects-of-ultrasonic-removal-of-fractured-files-from-the-middle-third-of-root-canals-on-dentinal-cracks-a-micro-computed-tomography-study
#15
M Fu, X Huang, W He, B Hou
AIM: To evaluate the frequency of dentinal microcracks after ultrasonic removal of fractured files from the middle third of root canals using micro-computed tomography (micro-CT). METHODOLOGY: Eighteen bilaterally matched pairs of human mandibular incisors extracted for periodontal reasons were included. The matched pairs of teeth were then divided into a control group and an experimental group, with one member of each pair assigned to each group. In the control group, the canals were instrumented using the ProTaper Next (PTN) system...
February 12, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29429822/12-month-success-of-cracked-teeth-treated-with-orthograde-root-canal-treatment
#16
Keith V Krell, Daniel J Caplan
INTRODUCTION: Long-term studies examining the treatment outcomes of "cracked teeth" that received orthograde root canal treatment in the United States do not exist. The purpose of the present study was to examine the distribution and 1-year treatment outcomes of cracked teeth receiving orthograde root canal treatment in 1 private endodontic practice over a 25-year period. METHODS: A total of 3038 cracked teeth were initially examined, and data from 2086 unique patients were analyzed...
April 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29380610/in-vitro-performance-of-ultrasound-enamel-preparation-compared-with-classical-bur-preparation-on-pit-and-fissure-sealing
#17
G F Ferrazzano, A Ingenito, B Alcidi, G Sangianantoni, M G Schiavone, T Cantile
AIM: Fissure sealants are effective in preventing caries. The aim of this in vitro study was to evaluate the effects of two different enamel surface preparation techniques for pit and fissure sealing. MATERIALS AND METHODS: Sixty extracted sound third molars were used. For each tooth, the mesial half of the occlusal fissures was treated with ultrasound diamond tip T1 mounted on an ultrasonic handpiece, while the distal half with conventional diamond bur. The teeth were randomly divided into 2 groups (n = 30/each)...
December 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29289728/associations-of-types-of-pain-with-crack-level-tooth-level-and-patient-level-characteristics-in-posterior-teeth-with-visible-cracks-findings-from-the-national-dental-practice-based-research-network
#18
Thomas J Hilton, Ellen Funkhouser, Jack L Ferracane, Valeria V Gordan, Kevin D Huff, Julie Barna, Rahma Mungia, Timothy Marker, Gregg H Gilbert
OBJECTIVES: The objective of this study was to determine which patient traits, behaviors, external tooth and/or crack characteristics correlate with the types of symptoms that teeth with visible cracks exhibit, namely pain on biting, pain due to cold stimuli, or spontaneous pain. METHODS: Dentists in the National Dental Practice-Based Research Network enrolled a convenience sample of subjects each of whom had a single, vital posterior tooth with at least one observable external crack (cracked teeth); 2858 cracked teeth from 209 practitioners were enrolled...
March 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29285154/impact-of-cusp-inclinations-on-dental-fractures-in-cracked-tooth-syndrome-model-and-relevant-risk-evaluation
#19
Nina Xie, Penglai Wang, Cui Wu, Wenting Song, Wen Wang, Zongxiang Liu
We explored the impact of cusp inclinations on dental fractures in cracked tooth syndrome model and formulated corresponding risk scale. Forty maxillary premolars were randomized into four groups for cusp inclination measurements by digital radiovisiography (RVG). For cracked tooth models, buccal and palatal cusp inclinations were achieved by grinding in groups I (59°-50°), II (64°-55°) and III (69°-60°), with group IV as blank control. All groups underwent compression loading test, with fracture levels recorded for statistical analysis...
December 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29275853/fractographic-analysis-of-a-split-tooth-presenting-radiographically-as-a-horizontal-root-fracture-in-an-unrestored-mandibular-second-molar
#20
Unni Krishnan, Alex Moule, Shaji Michael, Michael Swain
INTRODUCTION: Spontaneously catastrophic fracture of intact unrestored molar teeth is not common. Nevertheless, cracks do occur that progress apically, resulting in the complete splitting of the tooth and root. This report describes a catastrophic fracture that occurred in an unrestored mandibular second molar resulting in a previously unreported combination of a longitudinal and horizontal root fracture, appearing radiographically as a single horizontal root fracture. METHODS: Tooth fragments were examined clinically, stereoscopically, and by scanning electron microscopy...
February 2018: Journal of Endodontics
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