Search results for "Dentin"
showing 10 items of 266 documents
Estudio in vitro de la resistencia a la fractura mediante carga estática de materiales de restauración CAD-CAM para el sector posterior: influencia d…
2021
RESUMEN DE TESIS DOCTORAL Doctoranda: Georgina García Engra Título de la Tesis: “Estudio in vitro de la resistencia a la fractura mediante carga estática de materiales de restauración CAD-CAM para el sector posterior: influencia del tipo de material y de la técnica de adhesión”. Introducción: El uso de restauraciones de recubrimiento parcial es una opción terapéutica que nos permite restablecer la función y estética del diente afecto mediante procedimientos de mínima invasión. En la actualidad, han surgido nuevos materiales de restauración para el sector posterior: cerámicas libres de metal y materiales híbridos. El tratamiento de estos materiales nos permite llevar a cabo técnicas de cemen…
Conservation of optical purity of amino acids: a principal problem in biochemical and proto-biochemical systems.
1981
Dor L-amino acids, regardless of their state (peptide-bound or free, in the solid state or in aqueous solution), tend to racemize. In a living cell this racemization is usually compensated by specific degradation and replacement of the unwanted polypeptides that contain the wrong enantiomers. But a few long-lived proteins that are synthesized at or near birth are never replaced. Well investigated is the racemization of L-aspartic acid at a rate of 0.1 to 1.14 per cent per year in proteins from lenses and dentine. Increased racemization of eye lens proteins has been related to a form of human eye disease known as brunescent cataracts. Also quite well investigated is the racemization of amino…
INTERNATIONAL JOURNAL OF CLINICAL DENTISTRY
2018
Diagnosis and Management of Oral Langerhans Cell Histiocytosis Emanoele Paixão da Silva Silva, Carina Myung Rodenbeck, Monira Samáan Kallas, Cássia Maria Fischer Rubira, and Paulo Sérgio da Silva Santos Mandibular-Infected Buccal Cyst: Unique Radiographic Appearance Gustavo Zanna Ferreira, Cássia Maria Fischer Rubira, Letícia Rodrigues Nery, Alberto Consolaro, Izabel Regina Fischer Rubira-Bullen, and Paulo Sérgio da Silva Santos PRF - The Magical Resort in Surgical Dentistry Archana Mootha, Julie Toby Thomas, Sankari Malaiappan, Sheeja S. Varghese, and N. D. Jayakumar Endodontic Management of a Macrodont: A Rare Tooth Anomaly Rahul Rathi and Priti Saroha Maxillary Canine Root Resorption Con…
Relationship between pulp-tooth volume ratios and chronological age in different anterior teeth on CBCT
2017
Background The CBCT imaging technique exhibits proper accuracy to determine the internal anatomy of teeth. Therefore, this technique can use to estimate age by measuring the amount of decrease in the volume of the pulpal cavity of teeth. The aim of the present study was to evaluate the correlation between chronological age and pulp-to-tooth volume ratios in anterior teeth with the use of the CBCT technique and to determine a regression model to estimate human age. Material and methods In this present descriptive-analytical study, 122 subjects (46 males and 76 females), with an age range of 13-70 years, were evaluated. The MIMICS software program was used to determine the pulp-to-tooth volum…
Dentin-pulp complex reactions in conventional and radiation-related caries: A comparative study
2019
Background Radiation-related caries (RRC) is one of the most significant oral toxicities of head and neck radiotherapy (HNRT); however, the potential of radiation to directly cause harmful dentin and pulpal effects and impair response to caries progression is controversial. Material and Methods Therefore, the aim of this study was to characterize the reactions of the dentin-pulp complex in teeth affected by RRC. Patients and methods: Twenty-two carious teeth extracted from 22 head and neck cancer (HNC) patients were divided into control (conventional caries; n=11) and irradiated (RRC; n=11) groups and paired matched by dental homology, clinical patterns of caries progression following the P…
Correlation between alteration of enamel roughness and tooth color
2018
Background To establish the correlation between enamel roughness and color change of tooth. Material and Methods Enamel/dentin blocks (5 x 5 x 3.2 mm) were serially ground with the following abrasive paper: 1200-grit, 800-grit, and 600-grit SiC papers. In the paired model, the analyses of color (L*, a*, b*, ΔE) and roughness (Ra) were performed among the sandpaper exposure. The data were subjected to ANOVA using models for repeated measures followed by the Tukey test. The Pearson correlation test was used to determine whether there was a relationship between Ra values and color results (α = 0.05). Results The L* values decreased in accordance with the increase of Ra, with statistical differ…
Methodology in specimen fabrication for in vitro dental studies: Standardization of extracted tooth preparation
2017
Background Specimen preparation for in vitro study suffers a general lack of methodological homogeneity, as well as a lack of uniformity in the materials selected for fabricating them. This situation prevents comparisons between studies. When a specimen is not of dental origin it is not possible to study adhesion or bonding techniques realistically. The objective is to design and implement a method of specimen preparation that permits universal standardization for use in in vitro studies. Material and Methods A metal stump of specified dimensions was designed and fabricated by hand. It was scanned, the data digitalized, perfecting and standardizing the dimensions. Ten human molars were adap…
The efficacy of 8% Arginine-CaCO3 applications on dentine hypersensitivity following periodontal therapy: a clinical and scanning electron microscopi…
2013
Objectives: Periodontal therapy is one of the etiological factors of dentine hypersensitivity (DH). This study aimed to evaluate the efficacy of %8Arginine-CaCO3 on DH that affects patients after periodontal treatment. Study design: Seventy-one teeth from the volunteers (n=36) with history of DH caused by periodontal therapy were included in this study, and randomly divided into two groups: group-1, who received 8%Arginine-CaCO3 and group-2, who received 1.23%NaF-gel. The clinical indices were recorded at first visit.DH was evaluated by using tactile, air-blast, and thermal stimuli. The subject’s response was recorded at baseline, immediately (Day-0) and one month after the application. Res…
¿Son los adhesivos dentinarios una opción válida para el tratamiento de la sensibilidad cervical dentinaria?
2006
espanolEl objetivo de este trabajo es evaluar la capacidad in vitro de sellar tubulos dentinarios y reducir la permeabilidad dentinaria que tienen catorce productos propuestos para el tratamiento de la sensibilidad cervical dentinaria (SCD) y evaluar el efecto que la humedad y el cepillado tienen sobre ellos. Material y metodo: 140 discos de dentina (obtenidos de 3o molares humanos recien extraidos) se dividen en catorce grupos de 10 discos que se montan en un sistema de perfusion basado en la maquina de Pashley que mantiene una presion positiva sobre las discos. Cada disco se graba con acido ortofosforico al 35% y su permeabilidad se mide en una hora, este valor se considera el de referenc…
Bifunctional dentifrice: Amorphous polyphosphate a regeneratively active sealant with potent anti- Streptococcus mutans activity
2017
Abstract Objective In this study we demonstrate that inorganic polyphosphate (polyP) exhibits a dual protective effect on teeth: it elicits a strong antibacterial effect against the cariogenic bacterium Streptococcus mutans and, in form of amorphous calcium polyP microparticles (size of 100–400 nm), it efficiently reseals cracks/fissures in the tooth enamel and dentin. Methods Three different formulations of amorphous polyP microparticles (Ca-polyP, Zn-polyP and Sr-polyP) were prepared. Results Among the different polyP microparticles tested, the Ca-polyP microparticles, as a component of a newly developed formulation of a dentifrice, turned out to be most effective in inhibiting growth of …