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tooth cavities

F Femiano, R Femiano, L Femiano, A Jamilian, R Rullo, L Perillo
AIM: This review aims to summarise our understanding of the destructive role of acid environment and metalloproteinases in dentin caries progression using a review process. METHOD: The acids resulting from consumption of sugars by acidogenic and aciduric bacteria can cause demineralisation of the tooth surface, but are not able to cause caries-like lesions. The appearance of such lesions requires the activation of enzymatic proteolysis in an acidic environment for degradation of the dentin organic matrix, leading to cavity formation...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
Zana Agani, Vjosa Hamiti-Krasniqi, Jehona Recica, Mergime Prekazi Loxha, Fisnik Kurshumliu, Aida Rexhepi
BACKGROUND: Ameloblastoma is a benign epithelial odontogenic tumor. It is often aggressive and destructive, with the capacity to attain great size, erode bone and invade adjacent structures. Unicystic ameloblastoma is a rare odontogenic lesion, with clinical, radiographic and gross features of jaw cysts. The lesion histologically shows typical ameloblastomatous epithelium lining part of the cyst cavity with or without and/or mural tumor growth. Unicystic ameloblastoma usually presents in posterior mandibular ramus region, while it is rare and atypical in posterior maxillary region...
October 18, 2016: BMC Research Notes
Hang Yang, Yongli Bi, Xiaoran Shang, Mengyue Wang, Sara B Linden, Yunpeng Li, Yuhong Li, Daniel C Nelson, Hongping Wei
Streptococcus mutans often survives as a biofilm on the tooth surface and contributes to the development of dental caries. We investigated the efficacy of ClyR, an engineered chimeolysin, against S. mutans biofilms in physiological and cariogenic conditions. Susceptibility tests showed that ClyR was active against all clinical S. mutans isolates tested as well as S. mutans biofilms that displayed resistance to penicillin. S. mutans biofilms formed on hydroxyapatite discs in physiological sugar conditions and cariogenic conditions were reduced ∼2 logs and 3 logs after treatment with 100 μg/ml ClyR, respectively...
October 10, 2016: Antimicrobial Agents and Chemotherapy
Moreangels M Mbizah, Gerhard Steenkamp, Rosemary J Groom
African wild dogs (Lycaon pictus) are endangered and their population continues to decline throughout their range. Given their conservation status, more research focused on their population dynamics, population growth and age specific mortality is needed and this requires reliable estimates of age and age of mortality. Various age determination methods from teeth and skull measurements have been applied in numerous studies and it is fundamental to test the validity of these methods and their applicability to different species...
2016: PloS One
Keyong Yuan, Chenguang Niu, Qian Xie, Wenxin Jiang, Li Gao, Zhengwei Huang, Rui Ma
Minimally invasive endodontics emphasizes preservation of a maximal amount of healthy tooth tissue. However, whether the tooth structure preserved by minimally invasive endodontics can maintain higher fracture resistance is unclear. This study aimed to compare the biomechanics on teeth after minimally invasive (MI) preparation and straight-line (SL) preparation using finite element analysis. Six finite element analysis models of a mandibular first molar were constructed and divided into two groups (MI and SL)...
October 5, 2016: European Journal of Oral Sciences
C S Sampaio, K-J Chiu, E Farrokhmanesh, M Janal, R M Puppin-Rontani, M Giannini, E A Bonfante, P G Coelho, R Hirata
The present study aimed to characterize the pattern and volume of polymerization shrinkage of flowable resin composites, including one conventional, two bulk fill, and one self-adhesive. Standardized class I preparations (2.5 mm depth × 4 mm length × 4 mm wide) were performed in 24 caries-free human third molars that were randomly divided in four groups, according to the resin composite and adhesive system used: group 1 = Permaflo + Peak Universal Bond (PP); group 2 = Filtek Bulk Fill + Scotchbond Universal (FS); group 3 = Surefil SDR + XP Bond (SX); and group 4 = Vertise flow self-adhering (VE) (n=6)...
September 30, 2016: Operative Dentistry
Fu Xiong, Zhisong Ji, Yanhui Liu, Yu Zhang, Lingling Hu, Qi Yang, Qinwei Qiu, Lingfeng Zhao, Dong Chen, Zhihui Tian, Xuan Shang, Leitao Zhang, Xiaofeng Wei, Cuixian Liu, Qiuxia Yu, Meichao Zhang, Jing Cheng, Jun Xiong, Dongri Li, Xiuhua Wu, Huijun Yuan, Wenqing Zhang, Xiangmin Xu
Dentin dysplasia type I (DDI) is an autosomal-dominant genetic disorder resulting from dentin defects. The molecular basis of DDI remains unclear. DDI exhibits unique characteristics with phenotypes featuring obliteration of pulp chambers and diminutive root, thus providing a useful model for understanding the genetics of tooth formation. Using a large Chinese family with 14 DDI patients, we mapped the gene locus responsible for DDI to 3p26.1-3p24.3 and further identified a missense mutation, c.353C>A (p...
September 29, 2016: Human Mutation
Ana L Costa, Branca M A Silva, Rui Soares, Diana Mota, Vera Alves, Alice Mirante, João C Ramos, João Maló de Abreu, Manuel Santos-Rosa, Francisco Caramelo, Teresa Gonçalves
Type 1 diabetes mellitus (T1D) is considered a risk factor associated with oral yeast infections. The aim of this study was to evaluate the yeast oral carriage (in saliva and mucosal surface) of children with T1D and potential relation with host factors, particularly the subset of CD4+ T cells. Yeasts were quantified and identified in stimulated saliva and in cheek mucosal swabs of 133 diabetic T1D and 72 healthy control subjects. Salivary lymphocytes were quantified using flow cytometry. The presence of yeasts in the oral cavity (60% of total patients) was not affected by diabetes, metabolic control, duration of the disease, salivary flow rate or saliva buffer capacity, by age, sex, place of residence, number of daily meals, consumption of sweets or frequency of tooth brushing...
September 24, 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
René Daher, Albert J Feilzer, Ivo Krejci
OBJECTIVES: To evaluate the biomechanical influence of reconnecting the buccal and lingual walls of endodontically treated lower molar with a large MOD cavity. METHODS: 3D models were created from a micro-CT scan of an extracted intact lower human molar. Finite element analysis was then used to compare the stress distribution and displacement of the structures between different models: Unrestored MOD on ETT (Unrest), MOD on ETT restored with composite resin (Norm), MOD on ETT reinforced with a non-invasive ring (Ring) and intact tooth as the control (Int)...
November 2016: Journal of Dentistry
Maria Carlos Real Dias, Jorge N R Martins, André Chen, Sérgio André Quaresma, Henrique Luís, João Caramês
PURPOSE: This prospective clinical study evaluated the success rate of indirect composite resin cuspal coverage on endodontically treated molars and premolars and the survival rate of the restored teeth. MATERIALS AND METHODS: One hundred fifty endodontically treated teeth were restored with total resin cuspal coverage and randomly selected for the study. Patients were recalled after 2 to 5 years for clinical evaluation. Data were subjected to standard tests of statistical correlations using Spearman test...
September 23, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Saaid Ayesh Alshehadat, Mohamad Syahrizal Halim, Koh Carmen, Chew Shi Fung
BACKGROUND: "Stamp" technique is a new method for placing large composite restorations with accurate occlusal topography. It was introduced mainly to restore Class I cavities and erosively damaged teeth. This technique is indicated when the preoperative anatomy of the tooth is intact and not lost due to the carious lesion. A precise tooth-like filling an accurate functional occlusion is obtained when the stamp technique is applied. However, using this technique to restore Class II cavities is not established yet...
September 2016: Journal of Conservative Dentistry: JCD
Vinny Sara Varghese, John V George, Sylvia Mathew, Shruthi Nagaraja, H N Indiresha, K S Madhu
BACKGROUND AND OBJECTIVES: The aim of the study was to determine the effect of two access cavity designs on the peri-cervical dentin thickness before and after instrumentation using cone beam computed tomography (CBCT). MATERIALS AND METHODS: Sixty mandibular anterior teeth were divided into two groups of thirty teeth each: Group I: conventional access cavity preparation, where access was prepared just above the cingulum and Group II: incisal access cavity preparation, where access was prepared in proximity to the incisal edge...
September 2016: Journal of Conservative Dentistry: JCD
(no author information available yet)
Tests on a compound extracted from milk show it reduces the incidence of dental cavities and helps repair tooth decay.
July 31, 1991: Nursing Standard
Hiroto Ichishima
A cribriform plate, a perpendicular plate, and two lateral masses are major components of the ethmoid bone of mammals. Notwithstanding the noticeable bone, virtually sitting in the center of the skull, extensive modifications of the skull of modern cetaceans, especially odontocetes (toothed whales), and the lack of clarity as to what characteristics delimit each element of the ethmoid has made the problem of the nature of the cetacean ethmoid more complicated and elusive than in other, less modified mammals...
September 19, 2016: Journal of Morphology
Anastasia Agrafioti, Ioannis N Tsatsoulis, Styliani I Papanakou-Tzanetaki, Evangelos G Kontakiotis
Tooth fractures are common complications due to trauma in the oral cavity. Tooth fragments and foreign bodies may be embedded in soft tissues as a result of dentofacial trauma and go unnoticed in emergency situations. The inadequate management of such cases may lead to complications, such as foreign-body reaction and scarring. This report describes two cases with dental fragments embedded in the lower lip, which went unnoticed until the patients presented later for completely different treatments and emphasizes the importance of clinical and radiographic examination of soft tissues, even in cases that present late for dental trauma management...
July 2016: Journal of Clinical and Diagnostic Research: JCDR
Iqbal Musani, A R Prabhakar
Normal mastication with its varying magnitude and direction generates considerable reactionary stresses in teeth and their supporting tissues. The structure of the human tooth and its supporting tissues is a complex assemblage of materials of varied mechanical properties. The finite element method (FEM), a modern technique of numerical stress analysis, has the great advantage of being applicable to solids of irregular geometry and heterogeneous material properties and therefore ideally suited to the examination of structural behavior of teeth...
January 2010: International Journal of Clinical Pediatric Dentistry
Mehmet Ali Altay, Beste Ozgur, Zafer C Cehreli
Odontomas are the most common benign odontogenic tumors of the oral cavity; however, their occurrence in the primary dentition is an extremely rare condition. When associated with primary teeth, odontomas may lead to disturbances in tooth eruption, which often requires a multidisciplinary treatment approach. The purpose of this paper is to review the literature on odontomas of the primary dentition and discuss the management of a compound odontoma in a pediatric patient.
2016: Journal of Dentistry for Children
Nahid M Akhlaghi, Fatemeh Mashadi Abbas, Mostafa Mohammadi, Mohammad Reza Karami Shamloo, Orkideh Radmehr, Ramin Kaviani, Vahid Rakhshan
BACKGROUND: Root morphology is of utmost importance to endodontic sciences. Since there are a few studies on the morphology of mandibular second molars' roots, and some anatomical variables are not evaluated before, the aim of this study was to investigate thoroughly radicular anatomy of this tooth. MATERIALS AND METHODS: This ex vivo study was performed on 150 intact mandibular second molars. After access cavity preparation and ensuring canal patency, Indian ink was injected into root canals from the orifices...
July 2016: Dental Research Journal
Ava Vali Sichani, Shahrzad Javadinejad, Roshanak Ghafari
BACKGROUND: Direct observation cannot detect caries under restorations; therefore, the aim of this study was to compare the accuracy of radiographs and DIAGNOdent in detecting caries under restorations in primary teeth using histologic evaluation. MATERIALS AND METHODS: A total of 74 previously extracted primary molars (37 with occlusal caries and 37 without caries) were used. Class 1 cavity preparations were made on each tooth by a single clinician and then the preparations were filled with composite resin...
July 2016: Dental Research Journal
Eduardo Rodrigues Fregnani, Cláudia Joffily Parahyba, Karina Morais-Faria, Felipe Paiva Fonseca, Pedro Augusto Mendes Ramos, Fábio Yone de Moraes, Karina Gondim Moutinho da Conceição Vasconcelos, Gisela Menegussi, Alan Roger Santos-Silva, Thais B Brandão
BACKGROUND: Radiotherapy (RT) is frequently used in the treatment of head and neck cancer, but different side-effects are frequently reported, including a higher frequency of radiation-related caries, what may be consequence of direct radiation to dental tissue. The intensity-modulated radiotherapy (IMRT) was developed to improve tumor control and decrease patient's morbidity by delivering radiation beams only to tumor shapes and sparing normal tissue. However, teeth are usually not included in IMRT plannings and the real efficacy of IMRT in the dental context has not been addressed...
2016: Radiation Oncology
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