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tooth cavities

A B Segarra, I Prieto, M Martinez-Canamero, F Vargas, M De Gasparo, P Vanderheyden, S Zorad, M Ramirez-Sanchez
Stem cells constitute a non-specialised cell pool able for proliferation, self-renewal and differentiation into progeny constantly replacing used up tissue and/or organ fragments. They have been observed to be present in many tissue reservoirs, including stomatognathic system. Oral cavity seems to be a particularly attractive stem cells' source as these cells are richly present and easily accessible in dental and periodontal tissues and they can be used for therapeutic purposes. Their application is also morally and ethically non-controversial...
April 2018: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
Qianzhou Jiang, Yuting Huang, XinRan Tu, Zhengmao Li, Ying He, Xuechao Yang
INTRODUCTION: The aim of this study was to compare the biomechanical properties of first maxillary molars with different endodontic cavities using the finite element method. METHODS: Three finite element analysis models of a maxillary first molar were designed and constructed with 3 different types of endodontic cavities: a traditional endodontic cavity, a conservative endodontic cavity, and an extended endodontic cavity. An intact tooth model was used for comparison...
June 14, 2018: Journal of Endodontics
Ladan Madani, Edwin Sarkisians, Nazanin Kiomarsi, Mohammad Javad Kharazi Fard, Nasim Chiniforush
OBJECTIVES: Disinfection of enamel and dentin following cavity preparation is a necessity. Considering the possible effect of antimicrobial agents on tooth structure and dental adhesives, this study aimed to assess the microleakage of composite restorations following disinfection of cavity walls with antimicrobial photodynamic therapy (aPDT). MATERIALS AND METHODS: Standard class V cavities were prepared in the buccal surfaces of 68 extracted human premolars. The teeth were then randomly divided into four groups (n = 17) for use of different adhesive systems (Adper Single Bond 2 or One-Step Plus) and disinfection with aPDT...
June 12, 2018: Photodiagnosis and Photodynamic Therapy
Husniye Demirturk Kocasarac, Hassem Geha, Laurence R Gaalaas, Donald R Nixdorf
Imaging of hard and soft tissue of the oral cavity is important for dentistry. However, medical computed tomography, cone beam computed tomography (CBCT), nor MRI enables soft and hard tissue imaging simultaneously. Some MRI sequences were shown to provide fast soft and hard tissue imaging of hydrogen, which increased the interest in dental MRI. Recently, MRI allowed direct visualization of cancellous bone, intraoral mucosa, and dental pulp despite that cortical bone and dental roots are indirectly visualized...
July 2018: Dental Clinics of North America
Rakesh Singla, Sanjay Tewari, Jigyasa Duhan, Sudhir Kumar, Gurdeep Singh Gill, Namita Jain
Objectives: To evaluate the effect of 2% lignocaine containing 1:80,000 adrenaline on the microleakage and ultrastructure of resin tooth interface using an acetone based total etch adhesive (Prime and Bond NT) and an ethanol water based self etch adhesive system (Xeno III). Materials and method: Class V cavities were prepared on buccal surfaces of 72 maxillary first premolars scheduled for orthodontic extraction. In 36 premolars procedure was performed under local anaesthesia (LA) and in other 36 teeth without LA...
May 2018: Journal of Conservative Dentistry: JCD
Tomoko Kawano, Hideo Shigeishi, Eri Fukada, Takamichi Yanagisawa, Nobukazu Kuroda, Toshinobu Takemoto, Masaru Sugiyama
OBJECTIVE: The objective of this study was to clarify differences in bacterial accumulation between gastrointestinal cancer patients who underwent severely invasive surgery and those who underwent minimally invasive surgery. MATERIAL AND METHODS: We performed a preliminary investigation of gastrointestinal cancer patients who were treated at the Department of Surgery, Takarazuka Municipal Hospital, from 2015 to 2017 (n=71; 42 laparoscopic surgery, 29 open surgery) to determine changes in bacterial numbers at different sites of the oral cavity (tongue dorsum, gingiva of upper anterior teeth, palatoglossal arch), as well as mouth dryness and tongue coating indices...
June 11, 2018: Journal of Applied Oral Science: Revista FOB
Raiane S Lemes, Cassia C F Alves, Elisângela B B Estevam, Mariana B Santiago, Carlos H G Martins, Tainá C L Dos Santos, Antônio E M Crotti, Mayker L D Miranda
Tooth decay is a major public health problem which affects a large number of people in several countries. Even though more than 700 bacterial species have been detected in the oral cavity, Streptococcus and Lactobacillus stand out as the genera that cause tooth decay and other periodontal diseases. In this study, essential oils from Citrus aurantifolia leaves (CL-EO) and fruit peel (CP-EO) were obtained by hydrodistillation by a Clevenger-type apparatus whereas their chemical composition was analyzed by gas chromatography-flame ionization detector (GC-FID) and gas chromatography-mass spectrometry (GC-MS)...
April 2018: Anais da Academia Brasileira de Ciências
Mohit K Gunwal, Pratima R Shenoi, Tanvee Paranjape, Sonal Dhote, Ravish Tongya, Magesh Kumar, Sanjay Rastogi
Objectives: To evaluate the fracture resistance and mode of failure of maxillary premolars restorations restored with nanohybrid Composite, ORMOCER and Ceramic Inlays. Materials and method: 100 extracted first maxillary premolar were collected. Samples were divided into five groups. Group I - Intact premolars, Group II -MOD cavities without restorations, Group III - MOD cavities restored with composite restoration, GROUP IV - MOD cavities restored with ORMOCER restoration and GROUP V - MOD cavities restored with ceramic inlays...
May 2018: Journal of Oral Biology and Craniofacial Research
T Aslan, B Sagsen, Ö Er, Y Ustun, F Cinar
Objective: This study aimed to evaluate the effects of different coronal restoration techniques on fracture resistance of root canal-treated mandibular premolars with mesio-occluso-distal (MOD) cavities. Materials and Methods: A total of 105 mandibular premolars were selected and randomly distributed into seven groups (n = 15). MOD cavities were prepared except the control group. Root canal treatments were performed. Each tooth was embedded in acrylic resin. Groups were classified as follows; G1: intact teeth (control), G2: unfilled MOD cavity, G3: MOD + composite resin, G4: 10-mm-long fiber post + composite resin, G5: 5-mm-long fiber post + composite resin, G6: Ribbond in the occlusal surface + composite resin, and G7: horizontal fiber post + composite resin...
June 2018: Nigerian Journal of Clinical Practice
P Oyar, R Durkan
Objective: The purpose of this study was to evaluate the fracture resistance and failure modes of onlay restorations prepared with different preparation designs. Materials and Methods: A total of 42 extracted, mandibular first molars (36, 46) were used and divided into six groups according to preparation design, as follows 1A: Anatomic preparation of cusps/rounded shoulder margin/occlusal groove; 1B: Flat preparation of cusps/rounded shoulder margin/occlusal groove; 2A: Anatomical preparation of cusps/occlusal groove; 2B: Flat preparation of cusps/occlusal groove; 3A: Complete anatomical reduction of cusps/rounded shoulder margin; 3B: Complete flat reduction of cusps/rounded shoulder margin groups; intact tooth: No preparation...
June 2018: Nigerian Journal of Clinical Practice
Юрий В Смеянов, Юрий В Лахтин
OBJECTIVE: Introduction: Of the factors affecting the marginal permeability of restorations in the teeth, the state of stress-strain processes in the enamel with different design of the edge of the carious cavity has been poorly studied. The aim of this research was to study the influence of stress-strain processes in tooth enamel on the marginal permeability of class I restorations with a different design of the edge of the carious cavity. PATIENTS AND METHODS: Materials and methods: We have examined 45 pulled out intact third molars, which were divided into three groups of 15 each, depending on class 1 carious cavities formed in them...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
Cassiane Wigner Brochier, Fernando Neves Hugo, Rafaela Soares Rech, Alexandre Baumgarten, Juliana Balbinot Hilgert
OBJECTIVE: The study evaluated the association of the sociodemographic, behavioural variables and the oral conditions with the presence of oropharyngeal dysphagia in long-term care older persons. BACKGROUND: Due to the influence of ageing, swallowing may be altered both in people with natural teeth and in those who have dentures or tooth loss. MATERIALS AND METHODS: This cross-sectional study evaluated 115 individuals older than 60 years, living in long-term care institutions of the State of Rio Grande do Sul in 2016...
June 7, 2018: Gerodontology
Julia Luz, Dominique Greutmann, Daniel Wiedemeier, Claudio Rostetter, Martin Rücker, Bernd Stadlinger
BACKGROUND: There are few studies measuring the dimensions of the maxillary sinus, being mostly based on computed tomography imaging and rarely being based on cone-beam computed tomography (CBCT). The aim of this study was to measure the 3D osseous and soft tissue defined volume and surface area of the maxillary sinus. Further, possible associations with patient-specific and sinus-related variables were evaluated. METHODS: A total of 128 maxillary sinuses in 64 patients were analyzed using cone-beam computed tomography data...
June 5, 2018: International Journal of Implant Dentistry
Samah M Al-Amery, Phrabhakaran Nambiar, Jacob John, Kathiravan Purmal, Wei Cheong Ngeow, Nor Himazian Mohamed, Subramaniam Vellayan
This case report illustrates the teeth morphology of a chimpanzee and its anatomical variations. A well-preserved skull of a male Pan troglodytes troglodyte chimpanzee was scanned using a cone-beam computed tomography machine. Measurements included tooth and crown height, root length, root canal length and width (posterior teeth), and pulp cavity length (anterior teeth). Nonmetrical parameters included number of canals and foramina per root of every root. Interestingly, the mandibular central incisor was longer than the lateral incisor, and all the mandibular anterior teeth presented with a solitary flame-shaped or conical-calcified structure in their pulp cavity...
June 2018: Journal of Veterinary Dentistry
Ning Zhang, Ke Zhang, Xianju Xie, Zixiang Dai, Zeqing Zhao, Satoshi Imazato, Yousif A Al-Dulaijan, Faisal D Al-Qarni, Michael D Weir, Mark A Reynolds, Yuxing Bai, Lin Wang, Hockin H K Xu
Dental caries is prevalent worldwide. Tooth cavity restorations cost more than $46 billion annually in the United States alone. The current generation of esthetic polymeric restorations have unsatisfactory failure rates. Replacing the failed restorations accounts for 50⁻70% of all the restorations. This article reviewed developments in producing a new generation of bioactive and therapeutic restorations. This includes: Protein-repellent and anti-caries polymeric dental composites, especially the use of 2-methacryloyloxyethyl phosphorylcholine (MPC) and dimethylaminododecyl methacrylate (DMAHDM); protein-repellent adhesives to greatly reduce biofilm acids; bioactive cements to inhibit tooth lesions; combining protein-repellency with antibacterial nanoparticles of silver; tooth surface coatings containing calcium phosphate nanoparticles for remineralization; therapeutic restorations to suppress periodontal pathogens; and long-term durability of bioactive and therapeutic dental polymers...
June 1, 2018: Nanomaterials
Falk Schwendicke, Joachim Krois, Christian H Splieth, Nicola Innes, Mark Robertson, Julian Schmoeckel, Ruth M Santamaria
OBJECTIVES: The Hall Technique (HT), Non-Restorative Cavity Control (NRCC) and conventional carious tissue removal and restoration (CR) are strategies for managing cavitated caries lesions in primary molars. A randomized controlled three-arm parallel group trial in a university clinic in Germany was used to measure the cost-effectiveness of these strategies. METHODS: 142 children (HT: 40; NRCC: 44; CR: 58) were followed over a mean 2.5 years. A German healthcare perspective was chosen...
May 30, 2018: Journal of Dentistry
Jelena Krunić, Nikola Stojanović, Ljiljana Đukić, Jelena Roganović, Branka Popović, Ivana Simić, Dragica Stojić
OBJECTIVES: To evaluate local effect of gaseous ozone on bacteria in deep carious lesions after incomplete caries removal, using chlorhexidine as control, and to investigate its effect on pulp vascular endothelial growth factor (VEGF), neuronal nitric oxide synthase (nNOS), and superoxide dismutase (SOD). MATERIALS AND METHODS: Antibacterial effect was evaluated in 48 teeth with diagnosed deep carious lesion. After incomplete caries removal, teeth were randomly allocated into two groups regarding the cavity disinfectant used: ozone (open system) or 2% chlorhexidine...
June 1, 2018: Clinical Oral Investigations
I Politi, L E J McHugh, R S Al-Fodeh, G J P Fleming
OBJECTIVE: To modify the resin-based composite (RBC) restoration protocol for standardised Class II cavities in third molar teeth restored using conventional RBCs or their bulk fill restorative counterparts. Employing cuspal deflection using a twin channel deflection measuring gauge (during) and microleakage to determine marginal integrity (following) RBC restoration, the modified restoration protocol results were compared with traditional (oblique) restoration of Class II cavities. METHODS: Thirty-two sound third molar teeth, standardised by size and morphology, were subjected to standardised Class II cavity preparations and randomly allocated to four groups...
May 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Violaine Smaïl-Faugeron, Anne-Marie Glenny, Frédéric Courson, Pierre Durieux, Michele Muller-Bolla, Helene Fron Chabouis
BACKGROUND: In children, dental caries (tooth decay) is among the most prevalent chronic diseases worldwide. Pulp interventions are indicated for extensive tooth decay. Depending on the severity of the disease, three pulp treatment techniques are available: direct pulp capping, pulpotomy and pulpectomy. After treatment, the cavity is filled with a medicament. Materials commonly used include mineral trioxide aggregate (MTA), calcium hydroxide, formocresol or ferric sulphate.This is an update of a Cochrane Review published in 2014 when insufficient evidence was found to clearly identify one superior pulpotomy medicament and technique...
May 31, 2018: Cochrane Database of Systematic Reviews
Benjamin G Barrena, Billy J Phillips, Kenneth J Moran, Sasha J Betz
Ameloblastomas are benign but aggressive odontogenic tumors that most commonly affect the posterior mandible. Approximately 15% occur in the maxilla, with a subset thought to originate from the epithelial lining of the sinonasal cavities. Histologically, sinonasal ameloblastomas are identical to those of the oral cavity, with classical features of palisaded columnar basilar cells surrounding a central proliferation that resembles the stellate reticulum of a developing tooth. Unlike the gnathic variant, sinonasal ameloblastomas tend to affect males more than females, and the incidence of diagnosis peaks at a later age, approximately 60 years old...
May 30, 2018: Head and Neck Pathology
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