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1.
Dent. press endod ; 4(2): 45-51, maio-ago. 2014. tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-724349

ABSTRACT

Objetivo: avaliar a dissolução de tecido pulpar bovino nas soluções de hipoclorito de sódio comercializadas na região de Pelotas/RS. Métodos: foram testados o líquido de Dakin, a solução de Milton, licor de Labarraque e soda clorada duplamente concentrada, aviadas em farmácias de manipulação e adquiridas em lojas de materiais odontológicos. Avaliaram-se, também, as águas sanitárias das marcas Qboa, Clorofina e Brilhante, adquiridas em estabelecimentos comerciais, e uma solução aviada em farmácia de manipulação. Para a realização dos testes de dissolução tecidual, utilizou-se uma bomba peristáltica contendo 15ml de solução de hipoclorito de sódio, na qual foram inseridos fragmentos de polpa bovina, previamente seccionados, em frações de 10mm de sua porção central. Os dados de dissolução pulpar, segundo diferentes delineamentos, foram submetidos ao teste de normalidade de Anderson-Darling, que direcionou para os testes paramétricos ou não-paramétricos. Resultados: os hipocloritos a 5% exibiram a maior capacidade de solver o tecido pulpar bovino, enquanto o líquido de Dakin exibiu a menor, e os produtos a 2,5% e de 2,0 a 2,5% exibiram capacidade intermediária de dissolução pulpar bovina. A capacidade de solver o tecido pulpar bovino não foi observada na totalidade das amostras testadas


Subject(s)
Animals , Cattle , Dental Pulp , Dissolution , Sanitizing Products , Sodium Hypochlorite
2.
J Endod ; 39(5): 664-8, 2013 May.
Article in English | MEDLINE | ID: mdl-23611387

ABSTRACT

INTRODUCTION: Chlorhexidine (CHX) is likely to decompose into reactive by-products. This study evaluated the generation of 4-chloroaniline (pCA), reactive oxygen species (ROS), and 1-chloro-4-nitrobenzene in high concentrations of CHX and in a mixture of CHX and calcium hydroxide at different time points. METHODS: A gas chromatography method was developed to detect pCA and CHX by-products. Mass spectroscopy was used to elucidate the structure of compounds. The samples, which were kept at 36.5°C and 95% relative humidity during the study, were analyzed immediately and 7 days after preparation. RESULTS: pCA was detected in the 2% CHX solution and in the mixture of CHX and calcium hydroxide at all time points. pCA concentrations increased after storing under those conditions. The 2% CHX solution alone and the mixture of CHX and calcium hydroxide released ROS at all time points, but 1-chloro-4-nitrobenzene was not found. CONCLUSIONS: pCA and ROS were identified as by-products of the 2% CHX aqueous solution alone and as ointment base of calcium hydroxide paste.


Subject(s)
Aniline Compounds/analysis , Anti-Infective Agents, Local/chemistry , Calcium Hydroxide/chemistry , Chlorhexidine/analogs & derivatives , Nitrobenzenes/analysis , Reactive Oxygen Species/analysis , Tryptophan Hydroxylase/antagonists & inhibitors , Anti-Infective Agents, Local/analysis , Calcium Hydroxide/analysis , Chlorhexidine/analysis , Chlorhexidine/chemistry , Gas Chromatography-Mass Spectrometry , Humans , Humidity , Materials Testing , Temperature , Time Factors
3.
J Endod ; 35(5): 727-30, 2009 May.
Article in English | MEDLINE | ID: mdl-19410093

ABSTRACT

AIM: The aim of this study was to evaluate the concentration of calcium ions and smear layer removal by using root canal chelators according to flame atomic absorption spectrophotometry and scanning electron microscopy. Forty-two human maxillary central incisors were irrigated with 15% ethylenediaminetetraacetic acid (EDTA), 10% citric acid, 10% sodium citrate, apple vinegar, 5% acetic acid, 5% malic acid, and sodium hypochlorite. The concentration of calcium ions was measured by using flame atomic absorption spectrometry, and smear layer removal was determined by scanning electron microscopy. Mean +/- standard deviation, one-way analysis of variance, Tukey-Kramer, Kruskal-Wallis, Dunn, and kappa tests were used for statistical analysis. The use of 15% EDTA resulted in the greatest concentration of calcium ions followed by 10% citric acid; 15% EDTA and 10% citric acid were the most efficient solutions for removal of smear layer.


Subject(s)
Calcium/analysis , Chelating Agents/pharmacology , Dental Pulp Cavity/drug effects , Root Canal Irrigants/pharmacology , Smear Layer , Acetic Acid/pharmacology , Citrates/pharmacology , Citric Acid/pharmacology , Dental Alloys , Dental Pulp Cavity/ultrastructure , Dentin/drug effects , Dentin/ultrastructure , Edetic Acid/pharmacology , Humans , Incisor/drug effects , Malates/pharmacology , Materials Testing , Microscopy, Electron, Scanning , Nickel , Root Canal Preparation/instrumentation , Root Canal Preparation/methods , Sodium Citrate , Sodium Hypochlorite/pharmacology , Spectrophotometry, Atomic , Titanium
4.
Braz Dent J ; 19(3): 245-51, 2008.
Article in English | MEDLINE | ID: mdl-18949299

ABSTRACT

This study investigated the influence of cervical preflaring with different rotary instruments on determination of the initial apical file (IAF) in mesiobuccal roots of mandibular molars. Fifty human mandibular molars whose mesial roots presented two clearly separated apical foramens (mesiobuccal and mesiolingual) were used. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm short of the root apex. Five groups (n=10) were formed at random, according to the type of instrument used for cervical preflaring. In group 1, the size of the IAF was determined without preflaring of the cervical and middle root canal thirds. In groups 2 to 5, preflaring was performed with Gates-Glidden drills, ProTaper instruments, EndoFlare instruments and LA Axxes burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The instrument corresponding to the IAF was fixed into the canal at the WL with methylcyanoacrylate. The teeth were then sectioned transversally 1 mm short of the apex, with the IAF in position. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between canal diameter and the diameter of IAF were calculated using the tool "rule" (FEG) of the microscope's proprietary software. The measurements (microm) were analyzed statistically by Kruskal-Wallis and Dunn's tests at 5% significance level. There were statistically significant differences among the groups (p<0.05). The non-flared group had the greatest discrepancy (125.30 +/- 51.54) and differed significantly from all flared groups (p<0.05). Cervical preflaring with LA Axxess burs produced the least discrepancies (55.10 +/- 48.31), followed by EndoFlare instruments (68.20 +/- 42.44), Gattes Glidden drills (68.90 +/- 42.46) and ProTaper files (77.40 +/- 73.19). However, no significant differences (p>0.05) were found among the rotary instruments. In conclusion, cervical preflaring improved IAF fitting to the canals at the WL in mesiobuccal roots of maxillary first molars. The rotary instruments evaluated in this study did not differ from each other regarding the discrepancies produced between the IAF size and canal diameter at the WL.


Subject(s)
Dental Pulp Cavity/pathology , Molar/pathology , Root Canal Preparation/methods , Coated Materials, Biocompatible , Dental Alloys , Dental Pulp Cavity/ultrastructure , Dentin/ultrastructure , Equipment Design , Humans , Microscopy, Electron, Scanning , Molar/ultrastructure , Odontometry , Pulpectomy/instrumentation , Root Canal Irrigants/therapeutic use , Root Canal Preparation/instrumentation , Sodium Hypochlorite/therapeutic use , Stainless Steel , Surface Properties , Titanium , Tooth Apex/pathology , Tooth Apex/ultrastructure
5.
Braz. dent. j ; 19(3): 245-251, 2008. ilus, tab
Article in English | LILACS | ID: lil-495981

ABSTRACT

This study investigated the influence of cervical preflaring with different rotary instruments on determination of the initial apical file (IAF) in mesiobuccal roots of mandibular molars. Fifty human mandibular molars whose mesial roots presented two clearly separated apical foramens (mesiobuccal and mesiolingual) were used. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm short of the root apex. Five groups (n=10) were formed at random, according to the type of instrument used for cervical preflaring. In group 1, the size of the IAF was determined without preflaring of the cervical and middle root canal thirds. In groups 2 to 5, preflaring was performed with Gates-Glidden drills, ProTaper instruments, EndoFlare instruments and LA Axxes burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The instrument corresponding to the IAF was fixed into the canal at the WL with methylcyanoacrylate. The teeth were then sectioned transversally 1 mm short of the apex, with the IAF in position. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between canal diameter and the diameter of IAF were calculated using the tool "rule" (FEG) of the microscope's proprietary software. The measurements (µm) were analyzed statistically by Kruskal-Wallis and Dunn's tests at 5 percent significance level. There were statistically significant differences among the groups (p<0.05). The non-flared group had the greatest discrepancy (125.30 ± 51.54) and differed significantly from all flared groups (p<0.05). Cervical preflaring with LA Axxess burs produced the least discrepancies (55.10 ± 48.31), followed by EndoFlare instruments (68.20 ± 42.44), Gattes Glidden drills (68.90 ± 42.46)...


Este estudo investigou a influência do alargamento cervical feito com diferentes instrumentos rotatórios na determinação do instrumento apical inicial (IAI) das raizes mésio-vestibulares de molares inferiores. Foram utilizados 50 molares inferiores cujas raízes mesiais apresentavam dois forames apicais nitidamente separados (mésio-vestibular e mésio-lingual). Após o acesso à câmara pulpar de forma convencional e remoção do tecido pulpar, o comprimento de trabalho foi definido a 1 mm do ápice radicular. Os dentes foram divididos aleatoriamente em cinco grupos (n= 10) de acordo com o tipo de instrumento utilizado no alargamento cervical. No grupo 1, o IAI foi definido sem o prévio alargamento dos terços médio e cervical das raízes. Nos grupos 2 a 5, o terço cervical e médio do canal radicular foi alargado com as brocas de Gates-Glidden, instrumentos Pro Taper, Endo Flare e brocas LA Axxes, respectivamente. A determinação do IAI foi realizada manualmente com limas tipo K em ordem crescente de diâmetro a partir da lima 08 até se chegar ao instrumento que permitisse ao operador ter a sensação tátil do mesmo estar firmemente ajustado ao CRT. O instrumento que correspondeu ao IAI foi fixado no interior do canal radicular com cianocrilato de metila. Com o IAI posicionado, os dentes foram seccionados transversalmente até 1 mm do ápice. As seções transversais do CRT foram observadas através da microscopia eletrônica de varredura e os desajustes entre o diâmetro do canal e o diâmetro do IAI foram calculados com a função "régua" (FEG) do software do próprio microscópio. Os resultados foram avaliados estatisticamente pelo testes de Kruskal-Wallis e Dunn ao nível de significância de 5 por cento. Houve diferenças estatisticamente significantes entre os grupos (p<0,05). O grupo sem alargamento apresentou o maior desajuste (125,30 ±51,54) e diferiu significativamente dos demais grupos (p<0,05). O alargamento cervical com as brocas LA Axxess apresentou...


Subject(s)
Humans , Dental Pulp Cavity/pathology , Molar/pathology , Root Canal Preparation/methods , Coated Materials, Biocompatible , Dental Alloys , Dental Pulp Cavity/ultrastructure , Dentin/ultrastructure , Equipment Design , Microscopy, Electron, Scanning , Molar/ultrastructure , Odontometry , Pulpectomy/instrumentation , Root Canal Irrigants/therapeutic use , Root Canal Preparation/instrumentation , Stainless Steel , Surface Properties , Sodium Hypochlorite/therapeutic use , Titanium , Tooth Apex/pathology , Tooth Apex/ultrastructure
6.
Braz Dent J ; 18(2): 102-6, 2007.
Article in English | MEDLINE | ID: mdl-17982547

ABSTRACT

The purpose of this study was to investigate the influence of cervical preflaring on determination of the initial apical file in maxillary lateral incisors. Forty human lateral incisors with complete root formation were used. After standard access cavities, a size 06 K-file was inserted into each canal until the apical foramen was reached. The WL (WL) was set 1 mm short of the apical foramen. Four groups (n=10) were formed at random, according to the type of cervical preflaring performed. Group 1 received the initial apical instrument without previous preflaring of the cervical and middle root canal thirds. Group 2 had the cervical and middle root canal thirds enlarged with nickel-titanium Orifice Opener instruments. Group 3 had the cervical and middle root canal thirds enlarged with Gates-Glidden drills. Titanium-nitrite treated, stainless steel LA Axxess burs were used for preflaring the cervical and middle root canal thirds of group 4. Each canal was sized using manual K-files, starting with size 08 files with passive movements until the WL was reached. File sizes were increased until a binding sensation was felt at the WL, and the instrument size was recorded for each tooth. The apical region was then observed under a stereoscopic magnifier, images were recorded digitally and the differences between root canal and maximum file diameters were recorded (in mm) for each sample. Significant differences were found between the groups regarding the anatomical diameter at the WL and the first file to bind the canal (p = 0.01). The major discrepancy was found when no preflaring was performed (0.1882 mm average). Canals preflared with Orifice Opener instruments (0.0485 mm average) and Gates-Glidden drills (0.1074 mm average) also showed great discrepancy. The LA Axxess burs produced the smallest differences between anatomical diameter and first file to bind (0.0119 mm average). Instrument binding technique for determining anatomical diameter at WL was not accurate. Preflaring of the cervical and middle thirds of the root canal improved anatomical diameter determination; the instrument used for preflaring played a major role on determination of the anatomical diameter at the WL. Canals preflared with LA Axxess burs created a more accurate relationship between file size and anatomical diameter.


Subject(s)
Dental Pulp Cavity/pathology , Incisor/pathology , Root Canal Preparation/instrumentation , Tooth Apex/pathology , Dental Alloys , Equipment Design , Humans , Image Processing, Computer-Assisted , Maxilla , Nickel , Root Canal Preparation/methods , Stainless Steel , Surface Properties , Titanium , Tooth Cervix
7.
Braz. dent. j ; 18(2): 102-106, 2007. ilus, tab
Article in English | LILACS | ID: lil-466500

ABSTRACT

The purpose of this study was to investigate the influence of cervical preflaring on determination of the initial apical file in maxillary lateral incisors. Forty human lateral incisors with complete root formation were used. After standard access cavities, a size 06 K-file was inserted into each canal until the apical foramen was reached. The WL (WL) was set 1 mm short of the apical foramen. Four groups (n=10) were formed at random, according to the type of cervical preflaring performed. Group 1 received the initial apical instrument without previous preflaring of the cervical and middle root canal thirds. Group 2 had the cervical and middle root canal thirds enlarged with nickel-titanium Orifice Opener instruments. Group 3 had the cervical and middle root canal thirds enlarged with Gates-Glidden drills. Titanium-nitrite treated, stainless steel LA Axxess burs were used for preflaring the cervical and middle root canal thirds of group 4. Each canal was sized using manual K-files, starting with size 08 files with passive movements until the WL was reached. File sizes were increased until a binding sensation was felt at the WL, and the instrument size was recorded for each tooth. The apical region was then observed under a stereoscopic magnifier, images were recorded digitally and the differences between root canal and maximum file diameters were recorded (in mm) for each sample. Significant differences were found between the groups regarding the anatomical diameter at the WL and the first file to bind the canal (p = 0.01). The major discrepancy was found when no preflaring was performed (0.1882 mm average). Canals preflared with Orifice Opener instruments (0.0485 mm average) and Gates-Glidden drills (0.1074 mm average) also showed great discrepancy. The LA Axxess burs produced the smallest differences between anatomical diameter and first file to bind (0.0119 mm average). Instrument binding technique for determining anatomical diameter...


Avaliou-se a influência do pré-alargamento cervical na determinação do instrumento apical inicial em incisivos laterais superiores. Foram selecionados quarenta incisivos laterais superiores com completa formação radicular. Concluída cirurgia de acesso, uma lima tipo K #06 foi inserida em cada canal até atingir o forame apical. A partir desse comprimento foi reduzido 1 mm e determinou-se o comprimento de trabalho. Os dentes foram divididos em cinco grupos (n=10), de acordo com o tipo de alargamento cervical realizado: Grupo 1: sem alargamento; Grupo 2: instrumentos Orifice Opener; Grupo 3: brocas Gates-Glidden; Grupo 4: LA Axxess. Os canais foram explorados com lima do tipo K inserindo-se passivamente a lima 08 no comprimento de trabalho. A seguir, limas de maiores diâmetros foram sucessivamente introduzidas no canal radicular, até se obter a sensação de travamento no comprimento de trabalho. O diâmetro desse instrumento foi registrado, e este foi fixado em posição no canal com cianoacrilato de metila. Secções transversais realizadas no comprimento de trabalho foram observadas em lupa estereoscópica com auxílio de máquina fotográfica acoplada e as imagens foram digitalizadas. A diferença entre o menor diâmetro do canal e o diâmetro do instrumento apical inicial foi calculada para cada amostra (em mm). A análise estatística indicou diferença estatisticamente significante entre os grupos experimentais (p=0.01). A maior discrepância foi representada pelo grupo que não recebeu o pré-alargamento (média: 0,1882 mm). O grupo no qual o pré-alargamento foi realizado com instrumentos Orifice Opener também apresentou elevada discrepância entre o diâmetro anatômico e o instrumento apical inicial (média: 0,0485 mm), seguido pelo grupo que se utilizou Gates-Glidden (média: 0,1074 mm). As brocas LA Axxess promoveram a menor diferença entre o diâmetro anatômico no comprimento de trabalho e o instrumento apical inicial (média: 0,0119 mm). Pode-se concluir...


Subject(s)
Humans , Dental Pulp Cavity/pathology , Incisor/pathology , Root Canal Preparation/instrumentation , Tooth Apex/pathology , Dental Alloys , Equipment Design , Image Processing, Computer-Assisted , Maxilla , Nickel , Root Canal Preparation/methods , Stainless Steel , Surface Properties , Titanium , Tooth Cervix
8.
Rev. ABENO ; 6(1): 66-69, jan.-jun. 2006.
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-437115

ABSTRACT

A sala de aula não se limita a um espaço físico dentro da universidade. O aluno precisa ser inserido no contexto profissional, saindo de práticas realizadas exclusivamente dentro do espaço físico formal para atividades extra muros. As atividades extra muros têm sido utilizadas com sucesso entre os graduandos dos cursos da saúde (Odontologia, Nutrição, Enfermagem, Farmácia e Fisioterapia) da Universidade Paulista, Campus Vargas de Ribeirão Preto, através do exercício de práticas educativas e preventivas na comunidade, em parcerias públicas e privadas. É uma variação do ambiente ensino/aprendizagem valiosa tanto pelo contato do aluno com a comunidade, quanto pela grande interação entre professor e aluno. Os cursos de saúde devem proporcionar a aquisição de conhecimentos, habilidades e atitudes na vivência de um mundo real, conhecida através da integração da universidade com a comunidade. O aluno em contato com comunidades carentes, além do aprendizado, exerce cidadania, tornando-se um profissional mais humano. As instituições envolvidas neste estudo, considerando esses aspectos, incentivaram e apoiaram as atividades extra muros de ensino/aprendizagem, motivando professores e alunos e proporcionando troca de informações e de experiências através da integração dos graduandos dos diferentes cursos oferecidos. Nessas atividades externas, foram observados entusiasmo...


Subject(s)
Curriculum , Education, Dental , Health Education , Learning , Teaching
9.
Braz Dent J ; 15(2): 115-8, 2004.
Article in English | MEDLINE | ID: mdl-15776193

ABSTRACT

The present study evaluated, in vitro, the temperature alterations on the external root surface during instrumentation with four different rotary systems. A total of 20 extracted human maxillary lateral incisors were instrumented using either the ProFile, MicroMega, Quantec or K3 systems and the thermal alterations on the root surface were recorded by means of three thermocouples attached to the coronal, middle and apical portions of the root. Mean temperature increases no higher than 0.4 degrees C +/- 1.0 degrees C (ProFile system) were recorded, which indicates that these instruments are safe for the surrounding periodontal tissues.


Subject(s)
Body Temperature , Dental Instruments , Root Canal Preparation/instrumentation , Dental Alloys , Equipment Safety , Hot Temperature , Humans , Incisor , Nickel , Random Allocation , Titanium , Tooth Root
10.
Braz. dent. j ; 15(2): 115-118, 2004. graf
Article in English | LILACS | ID: lil-394817

ABSTRACT

O presente estudo avaliou, in vitro, as alterações térmicas na superfície externa radicular de dentes submetidos à instrumentação rotatória com quatro sistemas diferentes. Um total de 20 incisivos laterais superiores humanos foram divididos em 4 grupos e instrumentados com os sistemas ProFile, MicroMega, Quantec ou K3, sendo as variações térmicas da superfície radicular registradas por meio de 3 pares termoelétricos acoplados aos terços cervical, médio e apical das raízes dos dentes. Variações médias de temperatura não superiores a 0.4ºC ± 1.0ºC foram registradas (sistema ProFile), o que indica que estes instrumentos são seguros do ponto de vista biológico aos tecidos periodontais circunjacentes.


Subject(s)
Humans , Dental Instruments , In Vitro Techniques , Tooth Preparation , Differential Thermal Analysis , Nickel , Titanium
11.
ROBRAC ; 11(31): 27-29, jun. 2002. ilus, tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-391807

ABSTRACT

Analisou-se quantitativamente a presença ou ausência de resíduos de mercúrio em cápsulas pré-dosadas de amálgama de marcas Degussa, Permite SDI, SSWHITE (Velvalloy Plus) e Vigodent (Pratic NG2) já utilizadas. Utilizou-se para tanto, testes provenientes da química analítica denominado análise por via úmida. Concluiu-se que a cápsula da marca Degussa apresentou resultados negativos e as demais cápsulas testadas apresentaram resultados positivos para a presença de resíduos de mercúrio


Subject(s)
Capsules , Dental Amalgam , Mercury
12.
Rev. bras. odontol ; 59(2): 133-135, mar.-abr. 2002. tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-312618

ABSTRACT

Estudou-se a capacidade de remoçäo da pasta de hidróxido de cálcio PA misturada com água destilada e deionizada; pasta Calen (SS White) por meio da irrigaçäo pré-obturaçäo realizada com soluçäo de sacarose a 15 por cento ou com água destilada e deionizada. A quantidade remanescente das pastas foi aferida com o auxílio de métodos computadorizados. Os resultados evidenciaram que a irrigaçäo pré-obturaçäo com soluçäo de sacarose a 15 por cento mostrou-se mais eficiente na remoçäo do hidróxido de cálcio, embora nenhuma das soluçöes testadas tenha sido totalmente efetiva no volume estudado e que a pasta Calen PMCC foi a de mais fácil remoçäo do interior dos canais radiculares


Subject(s)
Calcium Hydroxide , Dental Waste , Root Canal Irrigants , Sucrose , Cuspid
13.
Braz. dent. j ; 12(3): 154-157, set.-dez. 2001. tab, CD-ROM
Article in English | LILACS, BBO - Dentistry | ID: biblio-872580

ABSTRACT

Estudou-se, in vitro, a ação solvente de quatro concentrações da solução de hipoclorito de sódio (0,5, 1,0, 2,5 e 5,0 por cento) sobre o tecido pulpar bovino, o teor de cloro residual, pH e a tensão superficial antes e após a dissolução. Um fragmento do tecido pulpar bovino era submerso na solução de hipoclorito de sódio que circulava em um aparato composto de uma bomba peristáltica e uma seringa Luer Lok e anotava-se o tempo até a total dissolução deste fragmento. De acordo com a metodologia empregada e com os resultados obtidos concluiu-se que: quanto maior a concentração da solução de hipoclorito de sódio maior a velocidade de dissolução do tecido pulpar, todas as soluções de hipoclorito de sódio apresentaram redução do pH e da tensão superficial após os testes de dissolução e as soluções de maior concentração apresentam menor consumo de cloro para a realização da dissolução tecidual


Subject(s)
Animals , Cattle , Dental Pulp , Sodium Hypochlorite , Chlorine , Hydrogen-Ion Concentration , Dose-Response Relationship, Drug , In Vitro Techniques , Solvents , Surface Tension
14.
Internet resource in Portuguese | LIS -Health Information Locator | ID: lis-737

ABSTRACT

Descreve sobre o estudo "in vitro" o tempo de amolecimento de cones de guta-percha através da ação de cinco solventes químicos: xilol, clorofórmio, turpentina, eucaliptol e óleo de laranja.


Subject(s)
Solvents , Endodontics , Gutta-Percha
15.
ROBRAC ; 6(21): 14-8, mar. 1997. ilus, tab, graf
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-235775

ABSTRACT

Estudou-se a adesividade de alguns cimentos obturadores dos canais radiculares antes e após a aplicaçäo de EDTAC sobre a superfície dentinária. Os resultados evidenciaram que, antes da aplicaçäo do EDTAC, a ordem dos cimentos, da maior adesividade para a menor, ficou assim estabelecida: Fillcanal, N-Rickert, Endométhasone e Endométhasone Ivory. Após aplicado o EDTAC sobre a superfície dentinária, a ordem, da maior adesividade para a menor, ficou assim: Fillcanal, N-Rickert, Endométhasone Ivory, sendo que estes dois últimos compuseram um grupo à parte, sem diferenças estatisticamente significante entre eles. A aplicaçäo de EDTC sobre a superfície dentinária surtiu efeitos estatisticamente significante apenas para o cimento Endométhasone Ivory, ao nível de 5 por cento


Subject(s)
Humans , Adhesiveness , Dental Cements/analysis , Dentin/chemistry , Root Canal Filling Materials/analysis , Root Canal Obturation , Edetic Acid/analysis , Eugenol/analysis
16.
Braz. endod. j ; 2(1): 56-9, 1997. ilus
Article in English | BBO - Dentistry | ID: biblio-850508

ABSTRACT

Gas released from the chemical reactions between sodium hypochlorite (0.5, 1.0, 1.5, 2.0, and 2.5 per cent) and 3 per cent hydrogen peroxide was investigated. The number of moles of released gas was measured to determine the pressure generated by the gas released in a closed system connected to a mercury manometer. The pressure data were submitted to the Clapeyron equation (P.V=n.R.T) and the number of released gas moles was determined. The differences among the multiple comparisons were statistically significant and the linear correlation between the concentration of sodium hypochlorite and the amount of released gas was directly proportional


Subject(s)
Gas Poisoning/diagnosis , Mercury , Hydrogen Peroxide/administration & dosage , Hydrogen Peroxide/analysis , Hydrogen Peroxide/pharmacokinetics , Hydrogen Peroxide/therapeutic use , Sodium Hypochlorite/administration & dosage , Sodium Hypochlorite/analysis , Sodium Hypochlorite/pharmacokinetics , Sodium Hypochlorite/therapeutic use , In Vitro Techniques
17.
ROBRAC ; 5(16): 15-7, dez. 1995. tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-168294

ABSTRACT

Estudou-se, utilizando-se a Especificaçäo N§ 57 da American Dental Association, o tempo de endurecimento dos seguintes cimentos endodônticos que contém hidróxido de cálcio em suas fórmulas: Apexit, Sealapex, CRCS e Sealer 26. O cimento CRCS evidenciou um tempo de endurecimento de 23 minutos; o Apexit, 1 hora e 30 minutos; o Sealer 16,41 horas e 22 minutos e o Sealapex, 45 horas e 34 minutos


Subject(s)
Humans , Male , Female , Zinc Oxide-Eugenol Cement/therapeutic use , Dental Cements/chemistry , Calcium Hydroxide/analysis , Time Factors
18.
Rev. bras. odontol ; 52(5): 14-6, set.-out. 1995. ilus, tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-160045

ABSTRACT

Estudaram-se as alteraçöes dimensionais de alguns cimentos obturadores de canais radiculares que continham hidróxido de cálcio em suas fórmulas: Sealer 26, CRCS, PR-Sealer (cimento confeccionado no laboratório de pesquisa em endodontia da FORP-USP), Apexit e Sealapex. Constatou-se que o cimento Sealpex näo resistiu ao experimento, desintegrando-se; todos os cimentos sofreram ligeira expansäo, com os maiores índices sendo encontrados com o PR-Sealer e os mesmos com o Sealer 26. Os testes seguiram a especificaçäo 57 da American Dental Association


Subject(s)
Calcium Hydroxide/analysis , Calcium Hydroxide/therapeutic use , In Vitro Techniques , Root Canal Filling Materials/analysis , Dental Cements/analysis , Root Canal Obturation/methods
19.
Rev. odontol. Univ. Säo Paulo ; 9(3): 189-92, jul.-set. 1995. ilus, tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-168192

ABSTRACT

Quantificou-se a variaçäo térmica durante a reaçäo química entre o hipoclorito de sódio nas concentraçöes de 0,5 por cento, 1,0 por cento, 1,5 por cento, 2,0 por cento, 2,5 por cento e 5,0 por cento com o peróxido de hidrogênio a 3 por cento. Observou-se a correlaçäo linear, diretamente proporcional, entre a concentraçäo das soluçöes de hipoclorito de sódio e a variaçäo térmica


Subject(s)
Root Canal Irrigants/analysis , Sodium Hypochlorite/analysis , Sodium Hypochlorite/chemistry , Hydrogen Peroxide/analysis , Hydrogen Peroxide/chemistry , Root Canal Therapy , Hot Temperature/therapeutic use
20.
ROBRAC ; 5(14): 25-8, mar. 1995. ilus, tab
Article in Portuguese | LILACS, BBO - Dentistry | ID: lil-160006

ABSTRACT

Estudou-se a capacidade solvente dos óleos essenciais Eucaliptol, Turpentina, óleo de laranja e suas respectivas associaçöes sobre guta-percha, utilizando-se o clorofórmio como controle, objetivando substituir os solventes tóxicos por óleos essenciais na desobturaçäo dos canais radiculares. Para tanto utilizou-se de uma aparelho denominado Panetrômetro PVBS. Póde-se ordenar os solventes de guta-percha, dos mais eficiente para o menos eficiente: 1§ Clorofórmio e a associaçäo óleo de laranja+Turpentina, 2§ óleo de laranja e a associaçäo óleo de laranja+Turpentina, 3§ óleo de laranja+Eucaliptol, 4§ Turpentina e a associaçäo Turpentina+Eucaliptol e 5§ Eucaliptol


Subject(s)
Humans , Dental Pulp Cavity , Gutta-Percha/therapeutic use , Oils, Volatile/therapeutic use , Solvents/therapeutic use , Chloroform , Eucalyptus , Root Canal Therapy
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