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Efeito das varia??es do pH na resist?ncia de uni?o e na nanoinfiltra??o de sistemas adesivos ? dentinaManfroi, Fernanda Borguetti 16 January 2018 (has links)
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Previous issue date: 2018-01-16 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / (Artigo 1 - Efeito dos ciclos de pH na resist?ncia de uni?o de diferentes sistemas
adesivos ? dentina)
Purpose: To verify the influence of the pH cycles on the microtensile bond
strength (?TBS) to dentin of three adhesive systems compared to the
immediate ?TBS and after storage in artificial saliva for 6 months. Materials
and methods: The occlusal surface of 32 sound third molar teeth was removed
to obtain a flat dentin surface. The teeth were randomly divided into four groups
(n=8/group): G1 - Single Bond Universal in the total-etch mode; G2 ? Single
Bond Universal in the self-etch mode; G3 ? Scotchbond Multi Purpose (totaletch
mode control); G4 ? Clearfil SE Bond (self-etch mode control). A block of
composite with 6 mm height was built on the adhesive area. After 24 h of
storage in distilled water at 37?C, the tooth/resin sets were cut parallel to the
long axis of the tooth, in the x and y directions, with a section of approximately
0.8 mm2
. Fifty-two specimens were obtained for each group, of which 26 were
submitted to pH cycles and the other 26 were stored in artificial saliva for 6
months. Subsequently, the specimens were submitted to a ?TBS test in a
universal testing machine at a crosshead speed of 0.5 mm/min. For the
immediate evaluation (24 h), results previously obtained were used for this
study. Results: According to the two-way ANOVA test, the interaction between
the factors (p=0.0001) was significant. There was no significant difference in the
immediate ?TBS between the adhesive systems. After 4 cycles of pH and 6
months of storage in artificial saliva, there was a significant decrease in ?TBS
for all adhesive systems. The failures were predominantly mixed. Conclusion:
The pH cycles and the storage in artificial saliva for 6 months were detrimental
to the stability of the bonding interface.
(Artigo 2 - Efeito dos ciclos de pH na nanoinfiltra??o de diferentes sistemas
adesivos ? dentina)
Purpose: To verify the influence of the pH cycles on the nanoleakage in the
dentin-adhesive interface of three adhesive systems compared to the
immediate nanoleakage and after storage in artificial saliva for 6 months.
Materials and methods: The occlusal surface of 24 sound third molar teeth
was removed to obtain a flat dentin surface. The teeth were randomly divided
into four groups (n=6/group): G1 ? Single Bond Universal in the total-etch
mode; G2 ? Single Bond Universal in the self-etch mode; G3 ? Scotchbond
Multi Purpose (total-etch mode control); G4 ? Clearfil SE Bond (self-etch mode
control). A block of composite with 6 mm height was built on the adhesive area.
After 24 h of storage in distilled water at 37?C, the tooth/resin sets were cut
parallel to the long axis of the tooth to obtain slices with a thickness of
approximately 1.0 mm. Three slices of the central region of each tooth were
obtained. One slice was submitted to pH cycles, and one slice was stored in
artificial saliva for 6 months. The nanoleakage methodology was applied.
Images of the dentin-adhesive interfaces were obtained by scanning electron
microscopy (2000x), and the images were analyzed in the ImageJ program to
evaluate the percentage of nanoleakage area (%N). Results: According to the
two-way ANOVA test, the interaction between the factors (adhesive system x
storage) (p=0.0001) was significant. There was no significant difference in the
%N between the adhesive systems at 24 h. After the pH cycles, the adhesive
systems applied in the self-etch mode obtained lower %N, differing significantly
from total-etch adhesives. After 6 months in artificial saliva, there was lower %N
compared to pH cycles, and the lowest %N occurred in self-etch adhesives.
Conclusion: The pH cycles caused higher nanoleakage than storage in
artificial saliva for 6 months. The self-etch adhesive systems had lower
nanoleakage after pH cycles and storage in artificial saliva for 6 months in
relation to total-etch adhesive systems. / (Artigo 1 - Efeito dos ciclos de pH na resist?ncia de uni?o de diferentes sistemas
adesivos ? dentina)
Objetivo: Verificar a influ?ncia dos ciclos de pH nos valores de resist?ncia de
uni?o ? microtra??o (R?T) ? dentina de tr?s sistemas adesivos em compara??o
com a R?T imediata e ap?s armazenamento em saliva artificial pelo per?odo de
6 meses. Materiais e m?todos: A superf?cie oclusal de 32 dentes terceiros
molares h?gidos foi removida para obter superf?cie plana em dentina, sendo
divididos aleatoriamente em quatro grupos (n=8/grupo): G1 ? Single Bond
Universal na vers?o total-etch; G2 ? Single Bond Universal na vers?o self-etch;
G3 ? Scotchbond Multi Purpose (controle da vers?o total-etch); G4 ? Clearfil SE
Bond (controle da vers?o self-etch). Sobre o sistema adesivo foi confeccionado
um bloco de 6 mm de altura em resina composta. Ap?s 24 h de armazenagem
em ?gua destilada a 37?C, os conjuntos dente/resina foram cortados
paralelamente no longo eixo do dente, nos sentidos x e y, com sec??o de
aproximadamente 0,8 mm2
. Cinquenta e dois corpos de prova foram obtidos,
em m?dia, para cada grupo, sendo 26 submetidos aos ciclos de pH, e os outros
26 ao armazenamento em saliva artificial por 6 meses. Na sequ?ncia, os
corpos de prova foram submetidos ao teste de microtra??o em m?quina de
ensaio universal EMIC DL-2000, com uma velocidade de 0,5 mm/min. Os tipos
de falha foram observados em microscopia eletr?nica de varredura. Para a
avalia??o imediata (24 h) foram utilizados resultados obtidos previamente a
este estudo. Resultados: De acordo com o teste ANOVA de duas vias a
intera??o entre os fatores (p=0,0001) foi significativa. N?o houve diferen?a
estat?stica na R?T imediata entre os sistemas adesivos. Ap?s os 4 ciclos de pH
e 6 meses de armazenamento em saliva artificial houve redu??o significativa
das m?dias de R?T para todos os sistemas adesivos. As falhas foram
predominantemente mistas. Conclus?o: Os ciclos de pH e o armazenamento
em saliva artificial durante 6 meses prejudicaram a estabilidade da interface de
uni?o.
(Artigo 2 - Efeito dos ciclos de pH na nanoinfiltra??o de diferentes sistemas
adesivos ? dentina)
Objetivo: Verificar a influ?ncia dos ciclos de pH na nanoinfiltra??o da interface
dentina-adesivo de tr?s sistemas adesivos em compara??o com a
nanoinfiltra??o imediata e ap?s armazenamento em saliva artificial por 6
meses. Materiais e m?todos: A superf?cie oclusal de 24 dentes terceiros
molares h?gidos foi removida para obter superf?cie plana em dentina, sendo
divididos aleatoriamente em quatro grupos (n=6/grupo): G1 ?Single Bond
Universal na vers?o total-etch; G2 ? Single Bond Universal na vers?o self-etch;
G3 ? Scotchbond Multi Purpose (controle da vers?o total-etch); G4 ? Clearfil SE
Bond (controle da vers?o self-etch). Sobre o sistema adesivo foi confeccionado
um bloco de 6 mm de altura em resina composta. Ap?s 24 h de armazenagem
em ?gua destilada a 37?C, os conjuntos dente/resina foram cortados
paralelamente no longo eixo do dente, resultando em fatias, com espessura de
aproximadamente 1,0 mm. Tr?s fatias da regi?o central de cada dente foram
obtidas, sendo uma fatia submetida aos ciclos de pH, e uma fatia armazenada
em saliva artificial por 6 meses. Na sequ?ncia foi aplicada a metodologia de
nanoinfiltra??o. Imagens das interfaces dentina-adesivo foram obtidas por meio
de microscopia eletr?nica de varredura (2000x), sendo as imagens analisadas
no programa ImageJ para avaliar a porcentagem de ?rea de nanoinfiltra??o
(%N). Resultados: De acordo com o teste ANOVA de duas vias, a intera??o
dos fatores (sistema adesivo x armazenamento) foi significativa (p=0,0001).
N?o houve diferen?a estat?stica na %N entre os sistemas adesivos na
avalia??o em 24 h. Ap?s os ciclos de pH os sistemas adesivos aplicados de
maneira self-etch obtiveram menor %N, diferindo estatisticamente dos adesivos
total-etch. Ap?s 6 meses em saliva artificial, houve menor %N comparado aos
ciclos de pH, e as menores %N ocorreram nos adesivos self-etch. Conclus?o:
Os ciclos de pH causaram maior nanoinfiltra??o do que o armazenamento em
saliva artificial por 6 meses. Os sistemas adesivos aplicados de maneira selfetch
tiveram menor nanoinfiltra??o ap?s os ciclos de pH e armazenamento em
saliva artificial por 6 meses em rela??o aos sistemas adesivos total-etch.
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Efici?ncia dos adesivos universais e primers na ades?o ? zirc?niaLopes, Raquel de Oliveira 17 January 2018 (has links)
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Previous issue date: 2018-01-17 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / (Artigo Os adesivos universais s?o t?o eficientes quanto um primer para a
ades?o ? zirc?nia?)
O objetivo do trabalho foi comparar a resist?ncia de uni?o ? cer?mica de zirc?nia de
quatro adesivos universais e um primer para zirc?nia. Setenta e cinco amostras de
zirc?nia foram confeccionadas e inclu?das em resina acr?lica. A superf?cie das amostras
foi polida com lixas de carbeto de sil?cio nas granula??es 600, 800 e 1.200 e jateadas
com ?xido de alum?nio 50 ?m por 5 s. As amostras foram divididas aleatoriamente em
cinco grupos (n=15): G1 ? Single Bond Universal (SBU); G2 ? All Bond Universal
(ABU); G3 ? Peak Universal Bond (PUB); G4 ? Ambar Universal (AU) e G5 ? Z-Prime
Plus (ZP). Um cone de resina composta foi constru?do, atrav?s de uma matriz, sobre o
material adesivo aplicado na superf?cie das amostras. Os corpos de prova foram
armazenados em ?gua destilada a 37?C por 24 h, sendo submetidos ao teste de
resist?ncia de uni?o ? tra??o em m?quina de ensaio universal EMIC com velocidade de
0,5 mm/min. Os tipos de falhas foram classificados em adesiva, coesiva ou mista. Os
valores de resist?ncia de uni?o foram submetidos ? an?lise de vari?ncia (ANOVA),
seguido do teste de Tukey (?=0,05). M?dias de resist?ncia de uni?o (MPa) seguidas de
letras distintas diferem estatisticamente entre si: G5=21,12a, G1=20,55a, G4=19,12ab,
G2=14,22b, G3=8,45c. As falhas foram predominantemente mistas no G1, G4 e G5, e
predominantemente adesivas no G2 e G3. Os adesivos SBU e AU obtiveram resist?ncia
de uni?o compar?vel ao ZP. / (Artigo Bond to zirconia ceramic: evaluation of different primers and a universal adhesive)
The aim of the study was to evaluate the effect of a universal adhesive and different
primers on the bond strength to zirconia ceramic. Seventy-five zirconia ceramic samples
were obtained and divided into five groups (n=15): G1 ? Scothbond Universal (SBU);
G2 ? silane + SBU; G3 - Signum Zirconia Bond; G4 - Z-Prime Plus; G5 - MZ Primer.
A cone of composite resin was built. The specimens were stored in 100% relative
humidity with distilled water at 37?C for 48 h, and then submitted to a tensile bond
strength test in a universal testing machine at a crosshead speed of 0.5 mm/min. The
type of failure that occurred during the debonding procedure was analyzed. The mean
results of the bond strength test (MPa) followed by the same letter represent no
statistical difference by ANOVA and Tukey?s post-hoc test (p<0.05): G2=27.55a
(?6.99), G4=23.71a (?5.65), G1=22.64a (?5.67), G5=13.64b (?5.49), G3=7.54c (?4.75).
G2 and G4 exhibited predominantly cohesive failure in the resin composite cone. G1
and G5 had predominantly mixed failures, and G3 exhibited only adhesive failures. The
SBU and Z-Prime Plus provided higher bond strength to zirconia ceramic. / (Artigo Os adesivos universais s?o t?o eficientes quanto um primer para a
ades?o ? zirc?nia?)
The aim of the study was to compare four universal adhesives and a primer on the bond
strength to zirconia ceramic. Seventy-five zirconia ceramic samples were obtained and
embedded in acrylic resin. The surface of the samples was polished with 600-, 800- and
1200-grit silicon carbide abrasive papers, and sandblasted with 50 ?m aluminum oxide
particles for 5 s. The samples were divided into five groups (n=15): Single Bond
Universal (SBU); G2 ? All Bond Universal (ABU); G3 ? Peak Universal Bond (PUB);
G4 ? Ambar Universal (AU) e G5 ? Z-Prime Plus (ZP). A cone of composite resin was
built on the adhesives and primer applied. The specimens were stored in distilled water
at 37oC for 24 h, and then submitted to a tensile bond strength test in a universal testing
machine at a crosshead speed of 0.5 mm/min. The type of failure that occurred during
the debonding procedure was classified as adhesive, cohesive or mixed. The values of
bond strength were analyzed by analysis of variance (ANOVA) followed by Tukey?s
test (?=0.05). Means of bond strength (MPa) followed by the distinct letters represent
statistical difference: G5=21,12a, G1=20,55a, G4=19,12ab, G2=14,22b, G3=8,45c. The
failures were predominantly mixed in G1, G4 and G5, and predominantly adhesive in
G2 and G3. SBU and AU adhesives obtained bond strength comparable to ZP.
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Avalia??o da Influ?ncia dos Inibidores de Proteases na Resist?ncia de Uni?o do Sistema Adesivo autocondicionante / Evaluation of the Influence of Protease Inhibitors on the Adhesion Resistance of the Self-Etching Adhesive SystemGrandizoli, Diana R. P. 19 December 2016 (has links)
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Previous issue date: 2016-12-19 / The present study sought to evaluate the influence of protease inhibitors on the bond strength of a self-etch adhesive system during hybrid layer formation in caries-affected dentin. The occlusal thirds of 80 permanent third molars were ground down to flat dentin surfaces. Dentinal caries were induced artificially by the microbial method. Groups were divided as follows: G1 (n=20), application of Clearfil SE Bond adhesive system (CL) alone; G2 (n=20), pretreatment with 2% chlorhexidine (CLX)+CL; G3 (n=20), pretreatment with sodium bicarbonate (BIC)+CL; G4 (n = 20), BI +CLX+CL. Bond strength was assessed immediately and at 6 months. Composite resin (Z350) build-ups were made on the dentin surfaces, and beam-shaped specimens with a cross-sectional area of 1 mm? were obtained. Microtensile bond strength testing was performed. Only adhesive or mixed-mode fractures were taken into account for calculation of bond strength. The results were submitted to the Kruskal-Wallis test (Student-Newman-Keuls). There was no significant difference on bond strength between the control, bicarbonate and chlorhexidine groups in the immediate test (p> 0.05). After 6 months, adhesive resistance fell for all groups. The control group had higher bond strength (p <0.05). The predominant fracture was of the adhesive type independent of the period evaluated. It can be concluded that after six months, there was decrease on bond strength for all groups. This reduction was greater in the groups in which the inhibitors were used / O objetivo desse trabalho foi avaliar a influ?ncia do bicarbonato de s?dio na resist?ncia adesiva durante a hibridiza??o da dentina cariada utilizando o sistema adesivo autocondicionante. Foram selecionados 80 terceiros molares permanentes, feita a remo??o do ter?o oclusal e superf?cies dentin?rias planas foram obtidas. A les?o de c?rie dentin?ria foi confeccionada atrav?s do m?todo microbiol?gico. Os grupos foram: G1 (n=20): aplica??o do sistema adesivo Clearfil (CL), G2 (n=20): aplica??o de clorexidina 2% (CLX) + CL, G3 (n=20): aplica??o de bicarbonato de s?dio (BI) + CL, G4 (n=20): BI + CLX + CL. A resist?ncia adesiva foi avaliada imediatamente e ap?s seis meses. Um bloco de resina composta Z350 foi constru?do em dentina. Cada bloco dente/adesivo/resina foi seccionado com disco diamantado acoplado ? m?quina de corte em planos paralelos obtendo-se corpos de prova em forma de palito, com ?rea de sec??o transversal de 1 mm?. Foi realizado teste de resist?ncia de uni?o por meio do teste de microtra??o. Foi considerada apenas fratura adesiva/mista para c?lculo da resist?ncia de uni?o. Os resultados foram submetidos aos teste de Kruskal-Wallis (Student-Newman-Keuls). N?o houve diferen?a significante na resist?ncia de uni?o entre os grupos controle, bicarbonato e clorexidina no teste imediato (p>0.05). Ap?s 6 meses, houve queda da resist?ncia adesiva para todos os grupos. O grupo controle apresentou maior resist?ncia de uni?o (p<0.05). A fratura predominante foi do tipo adesiva independente do per?odo avaliado.
Pode-se concluir que ap?s seis meses, houve diminui??o na for?a de uni?o para todos os grupos. Essa redu??o apresentou-se maior nos grupos em que os inibidores foram utilizados.
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