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1.
Article de Coréen | WPRIM | ID: wpr-787358

RÉSUMÉ

The aim of this study was to compare the shear bond strengths of orthodontic bracket with Conventional primer (CP), Moisture insensitive primer (MIP), and Self-etching primer (SEP). In addition, the effect and the timing of saliva contamination on shear bond strength was evaluated.A total of 135 bovine mandibular incisors were used in the study and divided into 3 groups. Group I, II and III were used CP, MIP, SEP, respectively. Each group was then divided into three subgroups: the group without saliva contamination, the group with primer application after saliva contamination, and the group with saliva contamination after primer application. After the primer application, the metal bracket for the lower incisor was attached and the shear bond strength was measured.The mean shear bond strengths was highest with CP and lowest with SEP in dry condition. However, CP showed a significant decrease in shear bond strength in the presence of saliva contamination. MIP and SEP showed no significant decrease in shear bond strength with saliva contamination.


Sujet(s)
Incisive , Brackets orthodontiques , Salive
2.
Acta odontol. latinoam ; 30(3): 141-148, 2017. tab, graf
Article de Anglais | LILACS | ID: biblio-905158

RÉSUMÉ

The aim of this study was to evaluate the impact of 10 wt% benzalkonium chloride (TBBAC) or 10 wt% cetylpyridinium chloride (TBCPC) on the antimicrobial properties of the orthodontic adhesive primer, Transbond XT™ (TB). Antimicrobial activity was assessed using a zone of inhibition diffusion test and the release of the antimicrobial compounds was monitored by high performance liquid chromatography (HPLC). Shear bond strength (SBS) was tested using bovine enamel. Control, TB, specimens failed to demonstrate intrinsic antibacterial activity at 1, 7 and 14 days; whereas, TBBAC and TBCPC showed antibacterial effects at all times. HPLC analysis indicated no significant differences in the release behaviour of TBBAC and TBCPC (ttest, p > 0.05), except for the 7day release which was higher for TBBAC (p < 0.05). By 14 days the extents of release were 27 ± 2% and 25 ± 5% of the total initial loading for TBBAC and TBCPC, respectively. The incorporation of 10 wt% BAC or CPC in Transbond XT™ adhesive primer also resulted in superior shear bond strength at 7 and 14 days (Fisher's LSD, p < 0.05) with no significant change in the mode of bracket failure under shear stress (Pearson's chisquared, p > 0.05) (AU)


El objetivo de este estudio fue evaluar el impacto del cloruro de benzalconio al 10% en peso del peso (TBBAC) o de cloruro de cetilpiridinio al 10% del peso (TBCPC) con propiedades antimicrobianas presentes en el adhesivo acondicionador ortodóncico, Transbond XT ™ (TB). La actividad antimi crobiana se evaluó usando una zona de prueba de difusión de inhibición y la liberación de los compuestos antimicrobianos se controló mediante cromatografía líquida de alta resolución (HPLC). La resistencia de adhesión al corte (SBS) se probó usando esmalte bovino. Las muestras control, TB no lograron demostrar actividad antibacteriana intrínseca a 1, 7 y 14 días; mientras que TBBAC y TBCPC mostraron efectos antibac terianos en todo momento. El análisis por HPLC no indicó diferencias significativas en el comportamiento de liberación de TBBAC y TBCPC (prueba t, p> 0,05), excepto en la liberación a los 7 días que fue más alta para TBBAC (p <0,05). A los 14 días, los grados de liberación fueron de 27 ± 2% y de 25 ± 5% de la carga inicial total para TBBAC y TBCPC, respectivamente. La incorpora ción de 10% en peso de BAC o CPC en el imprimador adhesivo Transbond XT ™ también dio como resultado una resistencia superior corte a los 7 y 14 días (Fisher's LSD, p <0.05) sin cambios significativos en el modo de falla del bracket bajo tensión de corte (Pearson's chicuadrado, p> 0.05) (AU)


Sujet(s)
Antibactériens , Composés de benzalkonium , Cétylpyridinium , Collage dentaire , Appareils orthodontiques , Composés d'ammonium quaternaire , Chromatographie en phase liquide à haute performance , Test de matériaux , Interprétation statistique de données
3.
Article de Anglais | IMSEAR | ID: sea-179952

RÉSUMÉ

Objectives: The purpose of this study was to compare the effect of pre-etching with 37% orthophosphoric acid on the shear bond strength (SBS) of orthodontic brackets bonded using self-etching primer (SEP). Materials and Methods: Two hundred freshly extracted human premolars were divided randomly into two groups based on pre-etching with 37% orthophosphoric acid: Group 1 (control, n = 50) without pre-etching and Group 2 (experimental, n = 150) with pre-etching. Group 2 was further divided into three sub groups 2a, 2b, and 2c with 50 teeth each and was first pre-etched with 37% orthophosphoric acid for 10, 30, and 60 s, respectively. Brackets were bonded on the teeth in both the groups using SEP and light cure adhesive. The SBS were determined using universal testing machine. The comparison of SBS was done using one-way analysis of variance and Tukey's honest significant difference test. Results: The SBS of experimental Group 2 was significantly higher than the control Group 1 (p < 0.0001). Further, the SBS of Group 2a was highest, followed by Group 2b and 2c (p < 0.0001). Conclusion: It was found that pre-etching for 10 s prior to application of SEP-adhesive system increases the SBS of orthodontic brackets.

4.
Article de Anglais | IMSEAR | ID: sea-169562

RÉSUMÉ

Context: Despite the advances in orthodontic material and treatment mechanics, the placement of fixed appliances increases the risk of enamel demineralization. The development of fluoride release adhesives has attracted considerable interests because the combined use of antimicrobials and fluoride enhances the cariostatic effect. Aim: To compare the shear bond strength (SBS) of fluoride release adhesives with established orthodontic adhesives and assess failure mode using adhesive remnant index (ARI). Settings and Design: The present study included 80 maxillary premolars which were randomly divided into four groups (n = 20) and were further subdivided into two subgroups A ‑ Pumice prophylaxis (PP) and subgroup B ‑ No PP (n = 10). Materials and Methods: Stainless steel brackets were bonded with Transbond XT, Transbond plus (TP) color change adhesive, Light Bond, and Clearfil protect bond. After debonding, the ARI was used to assess the mode of bracket failure. Statistical Analysis: The data were analyzed using two‑way analysis of variance, Post‑hoc Tukey Honest significant differences test, and Chi‑square test. Results: The mean SBS of Group 4 was comparably higher regardless of PP. Brackets bonded with TP showed a comparable SBS to conventional Transbond XT. The ARI scores were predominately 2. Conclusions: Fluoride releasing adhesives combined with antibacterial monomer can play a vital role in reducing white spot lesions by enhancing the cariostatic effect especially in noncompliant\medically compromised patients.

5.
Article de Chinois | WPRIM | ID: wpr-460760

RÉSUMÉ

Objective:To observe the effect of storage period of three experimental dentin self-etching primers on the shear bond strength.Methods:Three experimental primers with 2-hydroxyethyl methacrylate (HEMA)or N-methacryloyl glycine (NMGly)as a hydrophilic monomer and 1 0-methacryloxydecyl dihydrogen phosphate(MDP)or N-methacryloyl-2-aminoethylphosphonic acid (NMEP) as an acid monomer,were designed.Immediately after preparation of the samples of MDP-HEMA,MDP-NMGly and NMEP-NMGly, the primers were stored at 40 ℃for 0,6 and 1 4 weeks.At the end of each storage period,the shear bond strength of resin to dentin(n=1 4)and the pH value of the primers were measured.Results:After storage at 40 ℃ for 1 4 weeks,the shear bond strength of MDP-HEMA decreased from (1 7.61 ±1 .56)MPa to (7.53 ±1 .76)MPa;however the bond strenth of MDP-NMGly and NMEP-NMGly did not decrease;most of the specimens of MDP-HEMA and MDP-NMGly exhibited an interfacial failure of the resin from the dentin sur-face;however NMEP-NMGly exhibited a cohesional failure of the dentin and/or resin.The SEMimages showed a separation of resin and dentin of MDP-HEMA and MDP-NMGly had storaged at 40 ℃for 1 4 weeks;while the interface of NMEP-NMGly did not change.Con-clusion:The NMEP-NMGly primer has noticeably higher hydrolytic stability than the MDP-HEMA and MDP-NMGly primers.

6.
Article de Anglais | WPRIM | ID: wpr-213101

RÉSUMÉ

OBJECTIVE: The purpose of this study was to evaluate the effect of casein phosphopeptide amorphous calcium phosphate (CPP-ACP) on the shear bond strength (SBS) of brackets bonded to non-demineralized teeth with either phosphoric acid etching or self-etching primer. METHODS: Sixty human premolars were randomly assigned to 1 of 4 treatment groups (n = 15 each): phosphoric acid etching (group 1); self-etching primer (group 2); CPP-ACP for 2 weeks + phosphoric acid etching (group 3), and CPP-ACP for 2 weeks + self-etching primer (group 4). After bonding of the maxillary premolar metal brackets, specimens were subjected to shear forces in a testing machine. Scanning electron microscopy was used to observe etching patterns on the enamel surfaces of all teeth. A 2-way analysis of variance was used to test for effects of CPP-ACP and etching system on SBS. RESULTS: Significantly higher mean SBSs were observed in groups subjected to phosphoric acid etching (i.e., groups 1 and 3; p 0.05). We observed a uniform and clear etched pattern on the enamel surface of the phosphoric acid etching groups. CONCLUSIONS: CPP-ACP does not significantly affect the SBS of orthodontic brackets bonded to non-demineralized teeth, regardless of which adhesive method is used to bond the brackets.


Sujet(s)
Humains , Adhésifs , Prémolaire , Calcium , Phosphates de calcium , Caséines , Émail dentaire , Main , Microscopie électronique à balayage , Brackets orthodontiques , Acides phosphoriques , Dent
7.
Article de Coréen | WPRIM | ID: wpr-122165

RÉSUMÉ

OBJECTIVES: The purpose of this study was to compare the microshear bond strength (uSBS) to enamel prepared with different burs and to determine what type of bur were chosen when a self-etching primer adhesive was used. MATERIALS AND METHODS: Enamel of forty-two human molars were used. They were divided into one of six groups (n = 7), Group 1, coarse (125 - 150 microm) diamond bur; Group 2, standard (106 - 125 microm) diamond bur; Group 3, fine (53 - 63 microm) diamond bur; Group 4, extrafine (20 - 30 microm) diamond bur; Group 5, plain-cut carbide bur (no. 245); Group 6, cross-cut carbide bur (no. 557). Clearfil SE Bond and Clearfil AP-X (Kuraray Medical Inc.) was bonded to enamel surface. The bonded specimens were subjected to uSBS testing. RESULTS: The uSBS of Group 4 was the highest among groups and it was significantly higher than that of Groups 1, 2, 3, and 6 (p < 0.05), but it was not significantly different from that of Group 5. CONCLUSIONS: Different burs used on enamel surface affected the microshear bond strengths of a self-etching primer adhesive to the enamel surface. In the case of Clearfil SE Bond, extrafine diamond and plain-cut carbide bur are recommended for bonding to enamel.


Sujet(s)
Humains , Adhésifs , Émail dentaire , Diamant , Méthacrylates , Molaire , Céments résine
8.
Article de Coréen | WPRIM | ID: wpr-652185

RÉSUMÉ

OBJECTIVE: The purpose of this study was to determine (1) the shear bond strength (SBS) of an antimicrobial monomer-containing self-etching primer according to ceramic bracket types and (2) the bracket-adhesive failure mode using an adhesive remnant index (ARI). METHODS: A total of 90 extracted human teeth were randomly divided into 6 groups. Each group consisted of one of two ceramic brackets (monocrystalline, polycrystalline) and one of three primers (Transbond XT primer, Transbond Plus SEP, Clearfil Protect Bond) with each group containing 15 specimens. The SBS was measured, and adhesive residues left on the tooth surface were assessed. RESULTS: The SBS of polycrystalline ceramic bracket groups was significantly higher than that of the monocrystalline ceramic bracket groups (p < 0.001). The SBS of Transbond XT primer groups was significantly higher than those of Transbond Plus SEP groups and Clearfil Protect Bond groups (p < 0.001). All the groups showed bonding failures between the bracket base and adhesive. CONCLUSIONS: The combination of a self-etching primer with a monocrystalline bracket is recommended for clinical use, considering its acceptable SBS and mode of failure.


Sujet(s)
Humains , Adhésifs , Méthacrylate bisphénol A-glycidyl , Céramiques , Agents de collage dentinaire , Céments résine , Dent
9.
Article de Coréen | WPRIM | ID: wpr-105058

RÉSUMÉ

The purpose of this study was to compare the apical microleakage in root canal filled with Resilon by several self-etching primers and methacrylate-based root canal sealer. Seventy single-rooted human teeth were used in this study. The canals were instrumented by a crown-down manner with Gate-Glidden drills and .04 Taper Profile to ISO #40. The teeth were randomly divided into four experimental groups of 15 teeth each according to root canal filling material and self-etching primers and two control groups (positive and negative) of 5 teeth each as follows: group 1 - gutta percha and AH26(R) sealer; group 2 - Resilon, RealSeal(TM) primer and RealSeal(TM) sealer; group 3 - Resilon, Clearfil SE Bond(R) primer and RealSeal(TM) sealer group 4 - Resilon, AdheSe(R) primer and RealSeal(TM) sealer. Apical leakage was measured by a maximum length of linear dye penetration of roots sectioned longitudinally by diamond disk. Statistical analysis was performed using the One-way ANOVA followed by Scheffe's test. There were no statistical differences in the mean apical dye penetration among the groups 2, 3 and 4 of self-etching primers. And group 1, 2 and 3 had also no statistical difference in apical dye penetration. But, there was statistical difference between group 1 and 4 (p < 0.05). The group 1 showed the least dye penetration. According to the results of this study, Resilon with self-etching primer was not sealed root canal better than gutta precha with AH26(R) at sealing root canals. And there was no significant difference in apical leakage among the three self-etching primers.


Sujet(s)
Humains , Cavité pulpaire de la dent , Diamant , Gutta-percha , Mandrillus , Dent
10.
Article de Coréen | WPRIM | ID: wpr-105063

RÉSUMÉ

The purpose of this study was to evaluate the effect of passive or active application of primer and coat times of bond on the shear bond strength when a self-etching primer adhesive (Clearfil SE Bond) was applied to enamel surface. Crowns of sixteen human molars were selected. Buccal and lingual enamels of crowns were partially exposed and slabs of 1.2 mm thick were made. They were divided into one of four equal groups (n = 8). Group 1: passive application of Primer and 1 coat of Bond, Group 2: active application of Primer and 1 coat of Bond, Group 3: passive application of Primer and 2 coats of Bond, Group 4: active application of Primer and 2 coats of Bond. Clearfil AP-X was bonded to enamel suface of each group using Tygon tubes. The bonded specimens were subjected to microshear bond strength (uSBS) testing with a crosshead speed of 1 mm/min. The results of this study were as follows; 1. The uSBS of Group 1 was the lowest among groups and the uSBS of Group 4 was the highest. 2. There was not statistically significant interaction between enamel uSBS by application method of Primer and coat time of Bond (p > 0.05). 3. There was not statistically significant difference between enamel uSBS by passive and active application of Primer (p > 0.05). 4. There was statistically significant difference between enamel uSBS by one- and two-coat of Bond (p < 0.05).


Sujet(s)
Humains , Adhésifs , Couronnes , Émail dentaire , Méthacrylates , Molaire
11.
Rev. Fac. Odontol. Porto Alegre ; 49(3): 5-8, 2008. tab, graf
Article de Anglais | LILACS, BBO | ID: lil-563464

RÉSUMÉ

This study tested the null hypothesis that the number of applications of a self-etching primer would not influence the microtensile bond strength at the interface resin/enamel. Bovine teeth were flatted to expose the prismatic enamel with wet 600 grit silicon carbide papers. The teeth were divided into two groups: FB 1 coat, Futura Bond (Voco) applied according to the manufacturer's instruction for 30s; and, FB 4 coats, applied four times, 30s each. Then, they were restored with Polofil (Voco) resin composite. After 24h, samples were cut with a diamond low speed saw under water cooling to obtain stick-shaped specimens of approximately 0,5 mm² cross-sectional area. The sticks under went microtensile testing at a speed of 1 mm/min. The bond strength, in MPa, was: FB 1 coat, 33.57 ±8.77 (18); FB 4 coats: 33.57 ±8.77 (18). This values, at t student test, had not showed significant difference (p=0.58). In this study, the number of coats did not interfere at the values of bond strength at the interface resin/enamel.


Este estudo testou a hipótese nula de que o número de camadas de aplicação de um primer autocondicionante pode não influenciar na resistência da interface adesiva resina/esmalte à microtração. Dentes bovinos foram nivelados, para expor os prismas de esmalte, utilizando-se lixa d'água #600. Os dentes foram divididos em dois grupos: FB 1 camada, FuturaBond (Voco) aplicado de acordo com as recomendações do fabricante por 30s; e FB 4 camadas, aplicadas quatro vezes, 30s cada. Foram então restaurados com a resina composta fotopolimerizável Polofil (Voco). Após 24 horas, as amostras foram cortadas com um disco diamantado em baixa rotação sob abundante irrigação, para obter palitos de aproximadamente 0,5 mm² de área. Os palitos foram submetidos à microtração a uma velocidade de 1 mm/min. A resistência adesiva, em MPa, foi: FB 1 camada, 33.57 ±8.77 (18); FB 4 camadas: 33.57 ±8.77 (18). Esses valores, no teste t de student, não apresentaram diferença significativa (p=0.58). Nesse estudo, o número de camadas não interferiu nos valores de resistência de união da interface resina/esmalte.


Sujet(s)
Animaux , Bovins , Ciments dentaires , Émail dentaire , Matériaux dentaires , Résistance à la traction
12.
Article de Coréen | WPRIM | ID: wpr-175707

RÉSUMÉ

The purpose of this study was to evaluate the effect of burs on microleakage of Class V resin restorations when a self-etching primer adhesive was used. Forty Class V cavities were prepared with four different cutting burs on extracted third molars, and divided into one of four equal groups (n = 10); Group 1-plain cut carbide bur (no. 245), Group 2-cross cut carbide bur (no. 557), Group 3-fine diamond bur (TF-21F), Group 4-standard diamond bur (EX-41). The occlusal and gingival margin of cavities was located in enamel and dentin, respectively. Cavities were treated with Clearfil SE Bond and restored with Clearfil AP-X. Specimens were thermocycled, immersed in a 2% methylene blue solution for 24 hours, and bisected longitudinally. They were observed leakages at enamel and dentinal margins. Data were analyzed using Mann-Whitney and Wilcoxon signed ranked test. The results of this study were as follows; 1. At enamel margin, microleakage of group 4 was statistically higher than those of group 1, 2 and 3 (p < 0.01). 2. At dentinal margin, microleakage of group 4 was statistically higher than group 3 (p < 0.01), but group 1 and 2 were not statistically different with group 3 and 4. 3. Enamel microleakage was statistically higher than dentinal microleakage in group 1, 2 and 3 (p < 0.05), but statistical difference between the microleakage of enamel and dentinal margin was not in group 4. In conclusion, the use of coarse diamond bur showed high microleakage at both enamel and dentinal margin when Clearfil SE Bond was used in class V cavity.


Sujet(s)
Adhésifs , Émail dentaire , Instruments dentaires , Dentine , Bleu de méthylène , Dent de sagesse , Boue dentinaire
13.
Article de Coréen | WPRIM | ID: wpr-645456

RÉSUMÉ

OBJECTIVE: The purpose of this study was to evaluate the clinical usefulness of 4 self etching primers by measuring the shear bond strength of orthodontic brackets and examining the failure pattern of bracket-tooth interfaces. METHODS: Seventy-five, defect-free, premolars were randomly assigned into five groups: control group (37% phosphoric acid + Transbond XT primer) and self etching primer treated groups (Transbond Plus self etching primer, Unifil bond, Clearfil SE bond, and Adhese). The shear bond strength was measured with a universal testing machine and the amount of residual adhesive remaining on the brackets after debonding was assessed by the adhesive remnant index (ARI). RESULTS: The results showed that the groups conditioned with self etching primer had significantly lower shear bond strength than the control group (p 0.05). Evaluation of the ARI scores indicated there was less resin remnant on the teeth in the groups conditioned with self etching primers, although not statistically significant. CONCLUSION: The results of this study suggest that all four of the self etching primers have shown acceptable bond strength for clinical use.


Sujet(s)
Adhésifs , Prémolaire , Brackets orthodontiques , Dent
14.
Braz. dent. j ; Braz. dent. j;18(2): 113-118, 2007. ilus
Article de Anglais | LILACS | ID: lil-466502

RÉSUMÉ

The aim of this study was to compare two self-etching and a total-etch adhesive systems by assessing their shear bond strength to bovine enamel and the microleakage on class V composite restorations prepared on bovine enamel. Bovine teeth selected and allocated in three groups: Group 1: Scothbond Multi-Purpose; Group 2: Clearfil Liner Bond 2V; Group 3: Etch & Prime 3.0. For the microleakage test, each group was composed of ten class V restorations on the buccal surface. Two examiners attributed scores ranging from 0 (without leakage) to 3 (maximum leakage) to determine silver nitrate penetration at enamel-composite interface. Microleakage data were analyzed statistically by Kruskal-Wallis and Mann-Whitney tests at 5 percent significance level. For the bond strength test, ten teeth of each group were included, had their buccal surfaces flattened in order to obtain a 3-mm-diameter area to which a resin cylinder was bonded. After one week, the specimens were tested in shear strength at a crosshead speed of 0.5 mm/min. Bond strength data were treated by ANOVA and LSD tests at 5 percent significance level. The debonded interfaces were examined under scanning electron microscopy. No leakage was observed along enamel margins. Means (± SD) in MPa were: 18.75 (±5.83), 22.17 (±4.95) and 14.93 (±6.7) for Groups 1, 2, and 3, respectively. According to the results of this study, the self-etching primer systems presented statistically similar behavior (p>0.05) to that of the total-etch adhesive system (used as a control), not only regarding marginal leakage at bovine enamel-composite resin interface, but also regarding the shear bond strength of the bovine enamel. However, the self-etching primer systems differed significantly (p>0.05) to each other, with better results for Clearfil Liner Bond 2V. In conclusion, the self-etching primer systems had a performance comparable to that of the total-etch adhesive system.


O objetivo deste estudo foi comparar um sistema adesivo que utiliza condicionamento ácido total com outros contendo primers autocondicionantes em sua composição, quando aplicados ao esmalte bovino. Para isto, foram realizados testes de microinfiltração com corante e testes de resistência de união ao cisalhamento. Os dentes bovinos foram divididos em três grupos, de acordo com o sistema adesivo empregado: Grupo 1 (controle) - Scotchbond Multi-Uso Plus (3M); Grupo 2- Clearfil Liner Bond 2V (Kuraray); e Grupo 3- Etch & Prime 3.0 (Degussa). Para microinfiltração, cada grupo foi composto de dez restaurações classe V na superfície vestibular dos dentes e restauradas com o compósito TPH (Dentisply). A avaliação foi realizada por dois avaliadores previamente calibrados, usando um sistema de escore crescente de 0 (sem infiltração) até 3 (infiltração além da parede axial), dependendo do grau de penetração de um corante a base de nitrato de prata. Para o teste de resistência ao cisalhamento, 10 dentes de cada grupo foram incluídos em um tubo de metal, usando uma resina autopolimerizável. Suas superfícies vestibulares foram desgastadas até a obtenção de uma área de adesão com diâmetro de 3 mm. Sobre estas superfícies foram construídos cilindros de resina composta TPH. Após uma semana, foram submetidos ao ensaio de cisalhamento, a uma velocidade de 0,5 mm/min. Após a ruptura, as superfícies dos cilindros de resina composta foram recolhidas para observação em microscópio eletrônico de varredura. Para os testes de microinfiltração, os resultados foram tratados estatisticamente por Kruskal-Wallis e Mann-Whitney (p>0,05). O teste de microinfiltração não revelou diferença entre os grupos. Os resultados do teste de cisalhamento foram tratados por ANOVA e teste LSD (p<0,05). As médias e desvios padrão em MPa foram: G1: 18,75 ± 5,83; G2: 22,17 ± 4,95; G3: 14,93 ± 6,7. Não houve diferença estatisticamente significante entre o grupo controle e os autocondicionantes...


Sujet(s)
Animaux , Bovins , Mordançage à l'acide/méthodes , Collage dentaire , Émail dentaire/ultrastructure , Céments résine/composition chimique , Résines composites/composition chimique , Percolation dentaire/classification , Matériaux dentaires/composition chimique , Restaurations dentaires permanentes/classification , Éthanol/composition chimique , Test de matériaux , Microscopie électronique à balayage , Méthacrylates/composition chimique , Phosphates/composition chimique , Répartition aléatoire , Résistance au cisaillement , Coloration à l'argent , Contrainte mécanique , Propriétés de surface , Température , Facteurs temps , Eau/composition chimique
15.
Article de Coréen | WPRIM | ID: wpr-648647

RÉSUMÉ

OBJECTIVE: Several ions and components are released from self-etching primers in the oral cavity. This may cause injury to the periodontal tissues throughout orthodontic treatment. The purpose of this study was to assess the cytotoxicity of self-etching primers to HGF-1, HaCaT, and RHEK cells. METHOD: Transbond XT Primer (3M Unitek, Monrovia, CA, USA), and self-etching primers, Clearfil SE Bond (Kuraray, Osaka, Japan), Transbond Plus SEP (3M Unitek, Monrovia, CA, USA), and Adper Prompt L-Pop (3M Unitek, Monrovia, CA, USA), were evaluated by MTT assay, and cellular changes were also observed. RESULTS: In all cells after 72 hours with all primers, severe morphological changes such as atrophy and necrosis were observed. In the MTT assay using HGF-1, Clearfil SE Bond, Transbond XT Primer, Transbond Plus SEP, and Adper Prompt L-Pop were lined up in order of ascending cytotoxicity.When using HaCaT, Clearfil SE Bond, Adper Prompt L-Pop, Transbond Plus SEP, and Transbond XT Primer were lined up in order of ascending cytotoxicity. When using RHEK, Clearfil SE Bond, Transbond XT Primer, Adper Prompt L-Pop, and Transbond Plus SEP were lined up in order of ascending cytotoxicity. CONCLUSION: The result of this study shows that care is needed because self-etching primers show cytotoxic properties similar to conventional primers.


Sujet(s)
Atrophie , Ions , Bouche , Nécrose
16.
Article de Coréen | WPRIM | ID: wpr-653862

RÉSUMÉ

The purpose of this study was to evaluate and compare the shear bond strength of orthodontic brackets depending on the variety of adhesives and whether saliva exists, by using self-etching primer (SEP). Groups were divided according to the type of adhesive into resin adhesive (Transbond XT) and resin-modified glass ionomer cement (Fuji Ortho LC). One group of resin adhesive used XT primer after etching with 37% phosphoric acid, and the other group used self-etching primer. One group of resin-modified glass ionomer cement only used etching for bonding, and the other group used SEP. Each of the groups were also classified by whether saliva was contaminated or not, and then the shear bond strength was measured. The results showed that when using resin adhesive, the shear bond strength of SEP was lower than the XT primer. In the resin-modified glass ionomer cement groups, the shear bond strength which depends on the priming method, did not have a meaningful difference statistically. When saliva was contaminated, the group which used SEP, regardless of the adhesive variety, had a greater shear bond strength than the normal priming group. From these results, SEP showed a shear bond strength that is possible to be used clinically, regardless of the adhesive variety. It can especially be clinically useful to use SEP to bond brackets even on tooth surfaces contaminated with saliva, because it offers the appropriate bonding strength as well as shorter treatment time and easy application.


Sujet(s)
Adhésifs , Ciment ionomère au verre , Brackets orthodontiques , Salive , Dent
19.
Article de Coréen | WPRIM | ID: wpr-114827

RÉSUMÉ

This study evaluated the influence of application time of self-etching primers on microtensile bond strength (microTBS) to dentin using three self-etching primer adhesive systems. Dentin surfaces were exposed from forty-eight human molars. They were conditioned with three self-etching primers (Clearfil SE Bond [SE], Unifil Bond [UF], Tyrian SPE + One Step Plus [TY]) and different primining times (10s, 20s, 30s and 40s). Composite resins were bonded to dentin surfaces and specimens were made. microTBS was tested and statistically compared using by one-way ANOVA and Tukey's Test The results of this study presented that priming time for 10s in SE and UF groups and for 30s and 40s in TY group was highly decreased microTBS to dentin.


Sujet(s)
Humains , Adhésifs , Résines composites , Dentine , Molaire
20.
Article de Coréen | WPRIM | ID: wpr-645770

RÉSUMÉ

The purpose of this study was to investigate the influence of water, saliva, and blood contamination on the bonding strenght of metal brackets with a self-etching primer/adhesive to enamel. Ninety-six extracted human teeth were divided into four groups. The brackets were bonded to enamel with a self- etching primer (3M/Unitek Dental Products, Monorovia, California) according to one of four protocols. The teeth were bonded in a dry condition (group D) or in contamination with distilled water (group W), artificial saliva (group S), or fresh human blood (group B). Shear bond strengths were tested using an Instron Universal testing machine. After debonding, bracket and tooth surfaces were examined with a stereomicroscope. In each group, four samples were selected and examined with a Scanning electron microscope of the prepared enamel surface and resin-enamel interface. The results obtained were summarized as follows: Shear bond strength in group D (15.22 +/- 2.86 MPa) and W (16.20 +/- 3.85 MPa) were higher than in group B (12.56 +/- 2.94 MPa) (p 0.05). There was a tendency to have less residual adhesive remaining on the enamel surfaces of group B than group D. The SEM morphology of group D and W showed a more roughened etching pattern than group S and B. Water or saliva contamination on bonding of orthodontic brackets with Transbond plus self etching primer had almost no influence on bond strength. In this study, the blood contaminated group showed the lowest bond strength, but it was above the clinically acceptable bond strength (5.9-7.8 MPa, Reynold, 1975). The results of this study suggest that acceptable clinical bond strengths can be obtained in wet conditions when self-etching adhesives are used.


Sujet(s)
Humains , Adhésifs , Émail dentaire , Brackets orthodontiques , Salive , Salive artificielle , Dent , Eau
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