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tooth cavities

Oscar Villa, Per Ramberg, Hidekazu Fukui, Claes-Göran Emilson, Georgios Papanikolaou, Lars Heijl, Dowen Birkhed
OBJECTIVE: The aim of the present investigation was to study if there is a reduced clinical effect and fluoride retention of a mouthrinse solution containing both chlorhexidine (CHX) and sodium fluoride (NaF). MATERIAL AND METHODS: Two clinical trials were designed as double-blind, randomized, cross-over studies. In study I, 16 healthy subjects were asked to rinse twice daily for 1 min during 4 days of no tooth brushing with four solutions: (1) 0.12% CHX + 0...
October 14, 2017: Clinical Oral Investigations
Aishah Alhodhodi, Hanaa Alkharobi, Matthew Humphries, Hasanain Alkhafaji, Reem El-Gendy, Georg Feichtinger, Valerie Speirs, James Beattie
Estradiol (E2) has many important actions in the tissues of the oral cavity. Disruption of E2 metabolism or alterations in systemic E2 concentrations have been associated with compromised periodontal health. In many instances such changes occur secondarily to the well characterised effects of E2 on bone physiology -especially maintenance of bone mineral density (BMD). Despite these important epidemiological findings, little is known about the mechanism of action of E2 in oral tissues or the expression and function of oestrogen receptor (ER) isoforms in these tissues...
October 11, 2017: Journal of Steroid Biochemistry and Molecular Biology
Nicholas Bell-Allen, Harriet O'Rourke, Lisa Hong, Nicholas O'Rourke
BACKGROUND: The technique of laparoscopic ventral hernia repair has been evolving since it was first described over 20 years ago. We report a new technique where polyester mesh was back loaded through a 5-mm port site, coming into contact with the skin. This avoids the need for any 10-12-mm ports. METHODS: A prospective database of laparoscopic ventral hernia repairs was examined. A single surgeon performed 344 laparoscopic ventral hernia repairs using this technique over 60 months...
October 12, 2017: ANZ Journal of Surgery
Tomoko Sagai, Takanori Amano, Akiteru Maeno, Hiroshi Kiyonari, Hyejin Seo, Sung-Won Cho, Toshihiko Shiroishi
Interaction between the epithelium and mesenchyme coordinates patterning and differentiation of oral cavity structures including teeth, palatal rugae and tongue papillae. SHH is one of the key signaling molecules for this interaction. Epithelial expression of Shh in the tooth buds and tongue papillae is regulated by at least two enhancers, MRCS1 and MFCS4. However, it is unclear how the two enhancers cooperate to regulate Shh. Here, we found that simultaneous deletion of MRCS1 and MFCS4 results in the formation of a supernumerary tooth in front of the first molar...
October 11, 2017: Scientific Reports
Dalia Kaisarly, Moataz El Gezawi, Xiaohui Xu, Peter Rösch, Karl-Heinz Kunzelmann
Polymerization shrinkage of dental resin composites leads to stress build-up at the tooth-restoration interface that predisposes the restoration to debonding. In contrast to the heterogeneity of enamel and dentin, this study investigated the effect of boundary conditions in artificial cavity models such as ceramic and Teflon. Ceramic serves as a homogenous substrate that provides optimal bonding conditions, which we presented in the form of etched and silanized ceramic in addition to an etched, silanized and bonded ceramic cavity...
October 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Sarah Batschkus, Goekhan Cingoez, Henning Urlaub, Nicolai Miosge, Christian Kirschneck, Philipp Meyer-Marcotty, Christof Lenz
OBJECTIVES: Gingival crevicular fluid (GCF), the inflammatory infiltrate within the crevicular sulcus, is of great importance for diverse processes in the oral cavity and has a high impact in oral sciences. It is assumed to serve as a source of biomarkers for systemic or periodontal diseases and mediators of orthodontic tooth movement. In order to characterize the protein content of the GCF in an unbiased and complete approach, we employed mass spectrometry (MS), which allows not only the identification, but also the quantification of these proteins...
October 9, 2017: Clinical Oral Investigations
Neslihan Celik, Seda Askın, Mehmet Ali Gul, Nilgun Seven
OBJECTIVE: Composition of the restorative materials may cause inflammatory responses by monocyte activation and changes in the levels of cytokine released from different cells. Interleukin-6 (IL-6), interleukin-8 (IL-8) and Tumor necrosis factor alpha (TNF-α) are important cytokine for evaluating of the inflammatory process. The aim of this study was to evaluate the different restorative materials used in class V cavities effect on gingival crevicular fluid inflammatory cytokine levels...
September 27, 2017: Archives of Oral Biology
Ayse Gulsahi, Cemal Kivanc Kulah, Bahadir Bakirarar, Orhan Gulen, Kivanc Kamburoglu
OBJECTIVES: After tooth eruption, the size of the pulp cavity decreases with age due to deposition of secondary dentine. The aim of this study was to invastigate the relation between the Chronological age(CA) and the ratio of pulp volume (PV) to tooth volume (TV) measurements using cone-beam computed tomography (CBCT) images of single rooted teeth. METHODS: Maxillary anterior, canine and mandibular canine/premolar CBCT scans of patients older than 15 years of age were collected from the archives between 2013-2015 years...
October 9, 2017: Dento Maxillo Facial Radiology
Bojana D Ramic, Milan R Drobac, Igor L Stojanac, Milica T Premovic, Ljubomir M Petrovic
The aim of this study was to analyse the interfacial micromorphology of total-etch adhesives and dentin structures different locations by using SEM. Standardized cylindrical cavities (3mm in diameter, 2mm deep) with all margins in dentin were prepared on occlusal and buccal surfaces of twenty extracted human third molars. A total-etch dentin adhesive system and a light-cure flowable composite (Filtek Ultimate Flowable, 3M ESPE, St. Paul, MN, USA) were used in this study. Micro-morphological SEM analysis of the marginal seal of the original tooth specimens was performed using high magnification of up to 1000×...
October 7, 2017: Microscopy Research and Technique
Nyssa Cullin, Sylvio Redanz, Kirsten J Lampi, Justin Merritt, Jens Kreth
The overall health of the oral cavity is dependent upon a proper homeostasis between health-associated bacterial colonizers and bacteria known to promote dental caries. Streptococcus sanguinis is a health-associated commensal, a known early colonizer of the acquired tooth pellicle, and is naturally competent. We have shown that LytF, a competence-controlled murein hydrolase, is capable of inducing the release of extracellular DNA (eDNA) from oral bacteria. Precipitated and purified LytF were used as treatments against planktonic cultures and biofilms...
October 6, 2017: Applied and Environmental Microbiology
Federico Ferraris
Posterior indirect adhesive restorations (PIAR) are very common nowadays in clinical practice. The indirect approach is often indicated by a need for cuspal coverage (one or more cusps). With the adhesthetics protocol, the first step is to perform a cavity analysis evaluating the resistance of the tooth after restoration. The structures to be evaluated are, in sequence, the interaxial dentin, ridges, roof of the pulp chamber, and cusps. To improve the strength, the cusps should be covered, when required. The build-up for PIAR is performed with an adhesive technique, and, if possible, with low-shrinkage materials...
2017: International Journal of Esthetic Dentistry
C J Soares, Cmp Rosatto, V F Carvalho, A A Bicalho, Jcg Henriques, A L Faria-E-Silva
OBJECTIVES: To compare radiopacity and porosity as expressed by the presence of voids in restorations carried out using bulk-fill and incremental filling techniques to restore large mesio-occlusal-distal (MOD) cavities. METHODS: Fifty-five molars with MOD preparations were incrementally filled with Filtek Z-350XT (Z350XT) or bulk-fill composite: Filtek Bulk Fill/Z-350XT (FBF/Z350XT), Venus Bulk Fill/Charisma Diamond (VBF/CHA), SDR/Esthet-X HD (SDR/EST-X), Tetric EvoCeram Bulk Fill (TEC)...
October 4, 2017: Operative Dentistry
Ssl Braga, Lrs Oliveira, R B Rodrigues, A A Bicalho, V R Novais, S Armstrong, C J Soares
OBJECTIVES: To evaluate the effect of flowable bulk-fill or conventional composite resin on bond strength and stress distribution in flat or mesio-occlusal-distal (MOD) cavity preparations using the microtensile bond strength (μTBS) test. METHODS: Forty human molars were divided into two groups and received either standardized MOD or flat cavity preparations. Restorations were made using the conventional composite resin Z350 (Filtek Z350XT, 3M-ESPE, St Paul, MN, USA) or flowable bulk-fill (FBF) composite resin (Filtek Bulk Fill Flowable, 3M-ESPE)...
October 4, 2017: Operative Dentistry
Jerome Michetti, Adrian Basarab, Franck Diemer, Denis Kouame
The root canal segmentation on cone-beam (CBCT) images is a difficult task because of noise level, resolution limitations, beam hardening and dental morphological variations. An image-processing framework, based on an adaptive local threshold method, was evaluated on CBCT images acquired on extracted teeth. A comparison with high quality segmented endodontic images on micro computed tomography (µCT) images acquired from the same teeth, was carried out using a dedicated registration process. Each segmented tooth was evaluated according to volume and root canal sections by calculating the area and the Feret's diameter...
October 4, 2017: Physics in Medicine and Biology
Elisa M Chávez, Amruta Hendre
Pathologic changes in the oral cavity can portend the presence of systemic diseases and result in poor oral health and tooth loss, which are commonly symbolic of aging. Systemic diseases can have direct and indirect effects on oral health, and, likewise, poor oral health can impact general health and wellbeing. Negligence in oral care results in the accumulation of dental plaque and calculus, which eventually contributes to the onset of dental caries, periodontal disease, halitosis, tooth loss, and, ultimately, diminished oral function...
October 2017: Compendium of Continuing Education in Dentistry
Gildo C Santos, Len Boksman, M Jacinta Santos
Advances in technology and adhesive dentistry have allowed practitioners to achieve long-term restorative results with minimal damage to tooth structures. The use of bonded restorations in restorative dentistry, including placement of resin composite restorations, has largely replaced the use of amalgam. The clinical case presented describes a technique utilizing minimal cavity preparation aimed at improving the quality and longevity of a Class I resin composite restoration. The procedure includes the use of an occlusal index to restore the tooth back to its original contour and anatomy...
October 2017: Compendium of Continuing Education in Dentistry
George A Mandelaris, E Todd Scheyer, Marianna Evans, David Kim, Bradley McAllister, Marc L Nevins, Hector F Rios, David Sarment
BACKGROUND: The American Academy of Periodontology (AAP) recently embarked on a Best Evidence Consensus (BEC) model of scientific inquiry to address questions of clinical importance in periodontology for which there is insufficient evidence to arrive at a definitive conclusion. This review addresses oral indications for use of cone-beam computed tomography (CBCT). METHODS: To develop the BEC, the AAP convened a panel of experts with knowledge of CBCT and substantial experience in applying CBCT to a broad range of clinical scenarios that involve critical structures in the oral cavity...
October 2017: Journal of Periodontology
Hilal Siriner Gumus, Nilufer Tulin Polat, Guler Yildirim
STATEMENT OF PROBLEM: Data are lacking on the fracture resistance of monolithic zirconia inlay-retained fixed partial dentures as a conservative treatment for a single missing tooth. PURPOSE: The purpose of this in vitro study was to evaluate the fracture resistance of inlay-retained fixed partial dentures produced from 3 different monolithic zirconia materials and based on 2 preparation types and applications with and without thermocycling. MATERIAL AND METHODS: A model with missing right and left mandibular first molars was used for different cavity preparations...
September 29, 2017: Journal of Prosthetic Dentistry
V Moshkelgosha, Sh Mehrvarz, M Saki, A Golkari
STATEMENT OF PROBLEM: Fixed orthodontic appliances in the oral cavity make tooth cleaning procedures more complicated. OBJECTIVES: This study aimed to compare the efficacy of computerized oral hygiene instruction with verbal technique among fixed orthodontic patients referred to the evening clinic of Orthodontics of Shiraz Dental School. MATERIALS AND METHODS: A single-blind study was performed in Orthodontic Department of Shiraz, Islamic Republic of Iran, from January to May 2015 following the demonstrated exclusion and inclusion criteria...
March 2017: J Dent Biomater
Ki Bum Ahn, A Reum Kim, Kee-Yeon Kum, Cheol-Heui Yun, Seung Hyun Han
Streptococcus mutans is a major etiologic agent of human dental caries that forms biofilms on hard tissues in the human oral cavity, such as tooth and dentinal surfaces. Human β-defensin-3 (HBD3) is a 45-amino-acid natural antimicrobial peptide that has broad spectrum antimicrobial activity against bacteria and fungi. A synthetic peptide consisting of the C-terminal 15 amino acids of HBD3 (HBD3-C15) was recently shown to be sufficient for its antimicrobial activity. Thus, clinical applications of this peptide have garnered attention...
October 2017: Journal of Microbiology / the Microbiological Society of Korea
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