Reacción del tejido celular subcutáneo de la rata a implantes de conos de Resilon y conos de gutapercha / Reaction of the subcutaneous connective tissue of the rat to Resilon and gutta-percha cones implants

Evaluar la respuesta del tejido celular subcutáneo de la rata a implantes de conos de Resilon (CRE) y conos de gutapercha (CGP). Materiales y métodos: se implantaron en el tejido celular subcutáneo de ratas, conos de CRE y CGP de medidas similares y conicidad .04. La respuesta de los tejidos circundantes se analizó a los 14 y a los 84 días. La reacción a los materiales implantados fue clasificada en cuatro categorías, en función del grado creciente de inflamación y los resultados fueron sometidos a un análisis estadístico. Resultados: a los 14 días, se observó en contacto con CRE y con CGP una cápsula de tejido fibroso joven de poco espesor, vasos de neoformación y áreas ocupadas por escasas células inflamatorias, especialmente linfocitos y plasmocitos. Sólo tres casos de CRE y dos de CGP presentaron un grado de inflamación mayor en los tejidos circundantes. LUego de 84 días, la reacción fue similar para ambos materiales en todos los especímenes. Los conos estaban rodeados por un tejido conectivo fibroso maduro y denso, de mayor espesor, y escasos linfocitos y plasmocitos remanentes en los tejidos circundantes, con la singularidad de que en áreas aisladas y adyacentes a los CGP se observó presencia de partículas aparentemente liberadas por los conos, fagocitadas por macrófagos. Las diferencias entre CRE y CGP, tanto en un mismo período como entre ambos períodos de observación, no fueron significativas (p>0.05). Conclusión: luego de 84 días, los conos de CRE y CGP no se comportaron como materiales totalmente inertes en el tejido celualr subcutáneo de la rata. La persistencia de algunas células inflamatorias en los tejidos circundantes a los CRE y los CGP y la actividad macrofágica estimulada por la presencia de partículas liberadas por los CGP, sugieren evitar en lo posible la sobreobturación con los conos y mantenerlos dentro de los límites del conducto radicular...

Ferro‑concrete reinforcement of endodontically treated teeth with wide open apex.

Aim: The aim of the study was to compare the fracture resistance of roots obturated with mineral trioxide aggregate (MTA) obturation with post, MTA apical plug with Resilon obturation, MTA apical plug with gutta percha (GP) obturation, complete MTA obturation in teeth with wide open apex. Materials and Methods: Fifty freshly extracted human maxillary central incisors were selected. Teeth were divided into four experimental groups (n = 10) and one control group (n = 10). Fifty teeth were separated, and roots of each tooth were standardized to a length of 12 mm. Access opening was done and instrumented with ProTaper F2 passed beyond the apex. The canals were then irrigated with 17% ethylenediaminetetraacetic acid and 3% sodium hypochlorite. Calcium hydroxide was placed in the canals for 7 days. The specimens were then divided into five groups. Group I: Apical plug MTA with metal post, Group II: Apical plug MTA with Resilon, Group III Apical plug MTA with GP, Group IV: Complete MTA obturation, and Group V: Control group. Fracture strength was measured using Instron testing machine at a speed of 5 mm/min, and the data were statistically analyzed using ANOVA and t‑test. Results: The roots reinforced with metallic post and MTA (Group 1) has the higher fracture strength when compared with other groups (P < 0.05). Conclusion: This Ferro‑concrete reinforcement technique of MTA with the metallic post can be used in cases with wide open apex to increase the fracture resistance of tooth.

X-ray observation of root canal filling with Resilon/Epiphany Self-Etch / 实用口腔医学杂志

Objective:To evaluate the quality of root filling with Resilon/Epiphany Self-Etch(RESE).Methods:30 recently extrac-ted mandibular premolars were randomly divided into 2 groups.After root canal preparation,the roots in experimental group(n =1 4) were filled with RESE,those in control group(n =1 6)were filled with Gutta-percha/AH plus.The quality of the optical obturation was evaluated by X-ray photography.Results:The buccolingual X-ray scores of the two filling materials were higher than the mesiodistal sores(P 0.05).The mesiodistal X-ray score of RESE group was higher than that of Gutta-percha/AH plus group(P <0.05).Conclusion:The X-ray resistance of the RESE filling system is more favorable than Gutta-percha/AH plus for the evaluation of root filling quality by X-ray examination.

An in vitro comparison between the apical sealing abilities of resilon with Epiphany® sealer and gutta-percha with AH plus sealer.

Context: The study assesses the apical sealing ability of two obturating materials (resilon and gutta-percha) with their sealants by means of the dye penetration method using India ink. Aims: To compare the resistance to apical dye penetration between resilon (with Epiphany sealer; Epiphany®, Pentron clinical technologies, USA) and gutta-percha (with AH Plus sealer; Dentsply, Maillefer, Germany). It was hypothesized that there would be no difference between the two groups with regard to apical dye penetration. Settings and design: Hundred mandibular first premolars from individuals aged between 20 to 25 years were selected after their lengths were standardized. Materials and Methods: Instrumentation was performed with NiTi hand protaper files (Dentsply, Maillefer) using EDTA paste and copious irrigation with 2.5% sodium hypochlorite. Experimental group 1 consisted of roots that were treated with Epiphany primer and obturated with resilon (with Epiphany sealer). Experimental group 2 consisted of those obturated with gutta-percha using AH Plus sealer. The samples were immersed in blue India Ink and cleared using 5% nitric acid. Dye penetration was assessed under a stereomicroscope. Statistical analysis: Mann-Whitney U test. Results: Roots obturated with resilon core material and Epiphany sealer exhibited lesser mean apical dye penetration (1.281 mm; SD: 0.742) in comparison to those obturated with gutta-percha and AH plus sealer (2.154 mm; SD: 0.814). The difference was found to be highly significant (P<0.0025). Conclusion: Resilon (with Epiphany sealer) provided better radicular apical sealing in comparison to gutta percha (with AH Plus sealer).

Interfacial adaptation of an epoxy-resin sealer and a self-etch sealer to root canal dentin using the System B or the single cone technique

The aim of this laboratory study was to compare the interfacial adaptation of an epoxy-resin and a self-etch sealer in mesial root canals of mandibular molars filled using the System-B/Elements Obturation Unit. Sixty mesial root canals of mandibular molars were prepared using the K3 rotary system up to 35.04 instrument and then filled with the aid of the System-B/Elements Obturation Unit using either gutta-percha/ThermaSeal Plus (n=15) or Resilon/Real Seal SE (n=15). The single cone technique using both materials was used as control. The sealers were stained with Rhodamine B dye and the teeth were filled and sectioned at 2, 4 and 6 mm from the apex. The interfacial marginal adaptation of sealers was evaluated using confocal microscopy. Statistical analyses were performed by the Kruskall-Wallis test (α=0.05). In general, microscopic analysis showed a quite regular gap distribution pattern at sealer-dentin interfaces, mainly for the two groups filled with Real Seal SE. This means that both nonbonding root-filling groups (ThermaSeal Plus) showed significantly higher amount of gap-free regions regardless of the filling technique (p<0.05). Better marginal adaptation was obtained with gutta-percha and epoxy resin-based sealer using either the system B or the single cone technique.

O objetivo deste estudo laboratorial foi avaliar comparativamente a adaptação na interface obturação/dentina em canais mesiais de molares inferiores obturados com System B, tanto com guta percha/ThermaSeal Plus como com Resilon/Real Seal SE. Os canais mesiais de 60 molares inferiores foram modelados utilizando o sistema rotatório K3, realizando o batente apical com o instrumento 35,04. Em seguida os canais foram obturados com guta percha/ThermaSeal Plus (n=15) e com Resilon/Real Seal SE (n=15) por meio do System B. Obturações com a técnica do cone único utilizando os dois materiais foram empregadas como controle. Os cimentos foram corados com Rodamina B e os dentes obturados foram seccionados a 2, 4 e 6 mm do ápice. A adaptação da interface marginal foi avaliada utilizando a microscopia confocal. A análise estatística foi realizada empregando o teste Kruskall-Wallis (p<0,05). De modo geral, a análise microscópica mostrou um padrão regular na distribuição de fendas na interface cimento-dentina, principalmente para os dois grupos com cimento Real Seal SE. Sendo que os outros dois grupos (com ThermaSeal Plus), apresentaram uma quantidade significativamente menor de áreas com fendas, independentemente da técnica de obturação (p<0,05). A melhor adaptação marginal foi observada quando se utilizou guta percha e o cimento à base de resina epóxica, tanto com o System B como com cone único.

Rheological characterization of thermoplasticized injectable gutta percha and resilon / 대한치과보존학회지

OBJECTIVES: The purpose of this study was to observe the change in the viscoelastic properties of thermoplasticized injectable root canal filling materials as a function of temperature and to compare the handling characteristics of these materials. MATERIALS AND METHODS: Three commercial gutta perchas and Resilon (Pentron Clinical Technologies) in a pellet form were heated in the Obtura-II system (Obtura Spartan) at 140degrees C and 200degrees C, and the extrusion temperature of the thermoplasticized materials was measured. The viscoelastic properties of the materials as a function of temperature were evaluated using a rheometer. The elastic modulus G', viscous modulus G", loss tangent tandelta, and complex viscosity eta* were determined. The phase transition temperature was determined by both the rheometer and a differential scanning calorimeter (DSC). The consistency of the materials was compared under compacting pressure at 60degrees C and 40degrees C by a squeeze test. RESULTS: The three gutta perchas had dissimilar profiles in viscoelastic properties with varying temperature. The phase transition of softened materials into solidification occurred at 40degrees C to 50degrees C, and the onset temperatures obtained by a rheometer and a DSC were similar to each other. The onset temperature of phase transition and the consistency upon compaction pressure were different among the materials (p < 0.05). Resilon had a rheologically similar pattern to the gutta perchas, and was featured between high and low-flow gutta perchas. CONCLUSIONS: The rheological characteristics of the thermoplasticized root canal filling materials changed under a cooling process. The dissimilar viscoelastic properties among the materials require different handling characteristics during an injecting and compacting procedure.

Effectiveness of three solvents and two associations of solvents on gutta-percha and resilon

This study evaluated the effectiveness of 3 solvents (Citrol orange oil, Eucalyptol and Tetrachloroethylene) and 2 associations of solvents (Citrol orange oil+Tetrachloroethylene and Eucalyptol+Tetrachloroethylene) on 3 types of gutta-percha (conventional, thermoplastic and EndoREZ) and Resilon. Ten discs (10 mm diameter x 1 mm thick) from each material were prepared using standard metallic molds. Each specimen was weighed to determinate its initial mass. The specimens were immersed in the solvents for 10 min, followed by immersion in distilled water for 20 min, and were then reweighed to obtain the final mass. The mean weight loss determined the solvent capacity. Data were analyzed by ANOVA and Tukey's test at 5 percent significance level. Tetrachloroethylene was the most effective on conventional gutta-percha (p<0.05). Tetrachloroethylene was also the most effective on thermoplastic gutta-percha, but it was not significantly different (p>0.05) from Eucalyptol+Tetrachloroethylene, Citrol+Tetrachloroethylene, and Citrol. All solvents and associations presented little effectiveness on Resilon. The association Eucalyptol+Tetrachloroethylene was the most effective on EndoREZ, but it did not differ significantly (p>0.05) from Citrol+Tetrachloroethylene and Tetrachloroethylene. All evaluated substances presented solvent action. Tetrachloroethylene improved the effectiveness of both Citrol and Eucalyptol.

Este estudo avaliou a efetividade de 3 solventes (Citrol, Eucaliptol e Tetracloroetileno) e 2 associações (Citrol+Tetracloroetileno e Eucaliptol+Tetracloroetileno) sobre 3 tipos de guta-percha (convencional, termoplástica e EndoREZ) e Resilon. Dez discos (10 mm x 1 mm) de cada material foram preparados utilizando moldes metálicos. Cada espécime foi pesado para determinar a massa inicial. Os mesmos foram imersos nas soluções testadas por 10 min e em água destilada por 20 min. Os espécimes foram novamente pesados, agora para determinar a massa final. A perda média de peso determinou a capacidade solvente. Os dados foram analisados pelos testes ANOVA e Tukey. O tetracloroetileno foi o mais efetivo sobre a guta-percha convencional (p<0,05). Ele também foi o mais efetivo sobre a guta-percha termoplástica, mas sem diferença significativa para o Eucaliptol+Tetracloroetileno, Citrol+Tetracloroetileno e o Citrol (p>0,05). Todos os solventes e associações apresentaram pequena ação sobre o Resilon. A associação Eucaliptol+Tetracloroetileno obteve o melhor resultado sobre o EndoREZ, mas sem diferença significativa para o Citrol+Tetracloroetileno e o Tetracloroetileno (p>0,05). Todas as soluções apresentam ação solvente. O Tetracloroetileno melhorou a efetividade do Citrol e do Eucaliptol.

Revisão sistemática sobre a capacidade de selamento apical do Resilon/Epiphany® e da guta-percha/cimento / Systematic review about capacity of Resilon/Epiphany® and gutta-percha/cement to seal the apex of the root canal

Ao se obturar o sistema de canais radiculares, deseja-se que o material obturador apresente, entre suas propriedades, biocompatibilidade, selamento e que seja estável dimensionalmente. Sabe-se que, tanto da região apical como da coronária, fluidos e micro-organismos fluem, o que pode ocasionar uma contaminação do canal radicular ou então servir de nutriente para as bactérias que possam ter ficado após o preparo químico-mecânico, levando-se, assim, ao insucesso do tratamento endodôntico. Os materiais e métodos usados para execução da obturação têm sido amplamente estudados a fim de se conseguirem os melhores resultados, o que ainda representa um grande desafio na Endodontia. O objetivo desta revisão sistemática foi avaliar os estudos comparativos entre o sistema obturador de canais radiculares Resilon/Epiphany® e a guta-percha/cimento, apontando qual deles apresentou melhor capacidade seladora. Os resultados mostraram que, em se tratando de selamento apical, o Resilon/Epiphany® pode substituir a associação guta-percha/cimento. Contudo, estudos comparativos das outras propriedades desse sistema obturador são imprescindíveis.

During the obturation procedure of the root canals system is important that the filling substance presents among its qualities biocompatibility, sealing and that it can be dimensionally stable. There is a flow of fluids and microorganisms in the apical and coronary area, that can cause the contamination of the root canal or serve as nutriment to bacteria that can have remains after chemical and mechanical preparation, this situation will lead to failure to the endodontic treatment. The materials and methods used to the execution of obturation have been largely studied in order to get better results, what still representing a great challenge in Endodontics. The main purpose of this research was to evaluate the comparative studies between the obturator system of root canals Resilon/Epiphany® and the gutta-percha/cement, pointing which of them presents best sealing capacity. The results showed that, concerning to apical sealing, Resilon/Epiphany® can substitute the association of gutta/percha convention, however comparative studies of other qualities of the system filled are indispensable.

Ex vivo evaluation of coronal and apical microbial leakage of root canal - Filled with gutta-percha or Resilon/Epiphany root canal filling material.

Objective: This ex vivo study compared coronal and apical microleakage of root canals filled with Resilon/Epiphany (RE) or gutta-percha/Grossman sealer (GP), using either lateral condensation (LC) or System B (SB) technique. Materials and Methods: Specimens in eight experimental groups were obturated using the following materials and techniques: Groups 1 and 3 - GP and LC; groups 2 and 4 - GP and SB; groups 5 and 7 - RE and LC; groups 6 and 8 - RE and SB. Apical and coronal leakages were tested using bacterial methods. For coronal analysis, the number of days required for complete contamination of the root canals was recorded according to observation of the brain heart infusion broth turbidity for 15 weeks. For apical analysis, the teeth were cleaved and the leakage was measured at 30 days. Data were collected for each sample and analyzed statistically with the Chi-square and ANOVA tests. Results: Leakage was found in all groups. The difference between filling materials, obturation techniques, and median time of leakage was not statistically significant for coronal ( P=0.847) and apical ( P=0.5789) leakages. Conclusion: There were no differences between the different filling materials (gutta-percha/Grossman sealer and Resilon/Epiphany) and obturation techniques (lateral condensation and system B technique) in coronal or apical leakages.

Solvent capacity of different substances on gutta-percha and Resilon

The aim of this study was to evaluate the effectiveness of 3 solvents (eucalyptol, orange oil, and xylol) on 2 types of gutta-percha (conventional and thermoplastic) and Resilon. Specimens (10 mm diameter x 1 mm thick; n=7 per condition) were prepared and maintained at 37ºC for 48 h. Each specimen was weighed on a precision scale every 24 h until its mass was stable, at which time the initial mass was determined. Specimens (n=7) were then immersed in the solvent solutions and, after 48 h at 37ºC, they were reweighed at 24- h intervals, until stabilization (final mass). The difference between the final and the initial mass determined the solvent capacity of each solvent. Data were subjected to analysis of variance and Tukey's test at 5 percent significance level. The results demonstrated that xylol was the most effective, especially on conventional gutta-percha and Resilon (p<0.05). Eucalyptol and orange oil were more effective on thermoplastic gutta-percha than the other materials (p<0.05). It was concluded that all evaluated substances presented solvent action, but xylol was the most effective on both gutta-percha or Resilon.

O objetivo deste estudo foi avaliar a efetividade de 3 solventes em 2 tipos de guta-percha e no Resilon. Os materiais avaliados foram: guta convencional (Endo points), guta termoplastificada (Endo points TP) e cones de Resilon (RE). Amostras circulares medindo 10 mm de diâmetro e 1 mm de espessura foram preparadas, sendo mantidas a 37°C por 48 h. Cada amostra, com o anel metálico, foi pesada em uma balança de precisão a cada 24 h até estabilização da massa, quando a massa inicial era determinada. As amostras (n=7) foram imersas, então, nas soluções solventes avaliadas (eucaliptol, óleo de laranja, e xilol). Após 48 h a 37ºC, as amostras foram pesadas outra vez a cada 24 h, até a estabilização (massa final). A diferença entre a massa final e inicial determinou a capacidade solvente de cada material. Os dados foram submetidos à análise de variância em nível de significância de 5 por cento e teste de Tukey. Os resultados demonstraram que o xylol foi mais eficaz solvente, especialmente na guta convencional e no Resilon (p<0,05). O eucaliptol e o óleo de laranja foram mais eficazes sobre a guta thermoplastificada em relação aos outros materiais obturadores (p<0,05). Conclui-se que todas as substâncias testadas apresentam ação solvente, contudo, o xilol foi o mais efetivo sobre a guta-percha ou Resilon.

Análise histológica dos tecidos periapicais de dentes de cães como recurso para avaliar a influência dos auxiliares químicos da instrumentação no selamento dos canais radiculares obturados com RealSeal® e expostos ao meio bucal / Histological analysis of periapical tissue of dogs´ teeth as a means to evaluate the influence of irrigating solutions in the sealing of root canals filled with RealSeal® and exposed to oral environment

Este estudo, in vivo, visou a avaliar a influência do auxiliar químico no selamento dos canais radiculares obturados com o sistema RealSeal® e preparados para a colocação de pino protético, pela análise da resposta dos tecidos periapicais de dentes de cães. Foram testados os produtos químicos hipoclorito de sódio a 1% e a clorexidina gel a 2%. A pesquisa foi desenvolvida em 6 cães, 10 dentes em cada um deles, num total de 60 dentes e 120 canais divididos em sete grupos, sendo três grupos teste, três grupos controle negativo e um grupo controle positivo. Todos os dentes permaneceram selados por 24 horas após terem sido tratados. Decorrido este prazo, os selamentos provisórios dos dentes pertencentes aos grupos teste e controle positivo foram removidos, permanecendo sem selamento por 90 dias. Os dentes dos grupos controle negativo foram mantidos com selamento durante todo o período experimental, quando os animais foram mortos e suas mandíbulas removidas. O processamento histológico foi realizado com hematoxilina e eosina. A análise histológica, com auxílio de um microscópio óptico, baseou-se na avaliação da situação histológica dos tecidos periapicais. A análise estatística foi realizada a partir do teste não paramétrico de Kruskal-Wallis com localização de diferenças pelos procedimentos de post-hoc, de Mann-Whitney e Willcoxon. O nível de significância considerado adequado foi de 5%. Os grupos experimentais...

The aim of this study was to assess the influence of the cleaning protocol on sealing of root canal obturation with RealSeal following post space preparation, by means of periapical tissue response analysis. 1% sodium hypochlorite and 2% chlorhexidine were the tested products. For this purpose, six dogs were used, 10 teeth in each dog, comprising a total of 60 teeth and 120 root canals, were randomly divided into seven groups, being three test groups, three negative controls and a positive control. Following obturation, all teeth were kept totally sealed during 24 hours to allow sealer setting. Then the positive control and the three test groups had their seal removed, and obturation material exposed to the oral environment for 90 days. Negative controls were kept sealed during the whole experimental period. The animals were killed and their mandibles removed. Histological procedures were adopted as to HE staining. Optical histological analysis at magnifications varying from 25x to 400x considered the periapical tissue status at various sites...

Apical gaps after apicoectomy procedures performed on teeth filled with gutta-percha or ResilonTM

Aim: This ex vivo study compared, under scanning electron microscopy (SEM), the marginal adaptation ofroot canal obturation with either ResilonTM or gutta-percha cones following root-end resection. Methods:Thirty human single-rooted teeth with fully formed apices were collected and decoronated. The root canalswere instrumented up to a size 45 taper .04 and obturated with laterally condensed gutta-percha (Group 1;n=15) or ResilonTM (Group 2; n=15). AH Plus sealer was used in both groups. After 48-h storage in saline, theapical 3 mm of each root were resected with a water-cooled high-speed plain fissure #170L carbide bur.Epoxy resin replicas of the resected root ends were examined by SEM. The total area of apical gap in eachreplica was measured using UTHSCSA ImageTool software. Data were analyzed statistically by the Mann-Whitney U-test (á=5%). Results: The mean area of apical gap in groups 1 and 2 was 0.0042 mm2 and 0.0015mm2, respectively, with no statistically significant difference (P = 0.83). Conclusions: The type of materialdid not influence at the apical adaptation of root canal obturation after apicoectomy, and the misfit may berelated to anatomic factors.

Effect of irrigation methods on the adhesion of Resilon/Epiphany sealer and gutta-percha/AH 26 sealer to intracanal dentin / 대한치과보존학회지

The purpose of this study was to evaluate whether intracanal irrigation method could affect the adhesion between intracanal dentin and root canal filling materials (Gutta-percha/AH 26 sealer and Resilon/Epiphany sealer). Thirty extracted human incisor teeth were prepared. Canals were irrigated with three different irrigation methods as a final rinse and obturated with two different canal filling materials (G groups : Gutta-percha/AH 26 sealer, R groups : Resilon/Epiphany sealer) respectively. Group G1, R1 - irrigated with 5.25% NaOCl. Group G2, R2 - irrigated with 5.25% NaOCl, sterile saline. Group G3, R3 - irrigated with 5.25% NaOCl, 17% EDTA, sterile saline. Thirty obturated roots were horizontally sliced and push-out bond strength test was performed in the universal testing machine. After test, the failure patterns of the specimens were observed using Image-analyzing microscope. The results were as follows. 1. Gutta-percha/AH 26 sealer groups had significantly higher push-out bond strength compared with the Resilon/Epiphany sealer groups (p < 0.05). 2. Push-out bond strength was higher when using 17% EDTA followed by sterile saline than using NaOCl as a final irrigation solution in the Resilon/Epiphany sealer groups (p < 0.05). 3. In the failure pattern analysis, there was no cohesive failure in Group G1, G2, and R1. Gutta-percha/AH 26 sealer groups appeared to exhibit predominantly adhesive and mixed failure patterns, whereas Resilon/Epiphany sealer groups exhibited mixed failures with the cohesive failure occurred within the Resilon substrate.

Microleakage of resilon: Effects of several self-etching primer / 대한치과보존학회지

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.

Microleakage of resilon by methacrylate-based sealer and self-adhesive resin cement / 대한치과보존학회지

The purpose of this study was to compare the apical microleakage in root canal filled with Resilon by methacrylate-based root canal sealer or 2 different self-adhesive resin cements. Seventy single-rooted extracted human teeth were sectioned at the CEJ perpendicular to the long axis of the roots with diamond disk. Canal preparation was performed with crown-down technique using Profile NiTi rotary instruments and GG drill. Each canal was prepared to ISO size 40, .04 taper and 1 mm short from the apex. The prepared roots were randomly divided into 4 experimental groups of 15 roots each and 5 roots each for positive and negative control group. The root canals were filled by lateral condensation as follows. Group 1: Guttapercha with AH-26, Group 2: Resilon with RealSeal primer & sealer, Group 3: Resilon with Rely-X Unicem, Group 4: Resilon with BisCem. After stored in 37degrees C, 100% humidity chamber for 7 days, the roots were coated with 2 layers of nail varnish except apical 3 mm. The roots were then immersed in 1% methylene blue dye for 7 days. Apical microleakage was measured by a maximum length of linear dye penetration after roots were separated longitudinally. One way ANOVA and Scheffe's post-hoc test were performed for statistical analysis. Group 1 showed the least apical leakage and there was no statistical significance between Group 2, 3, 4. According to the results, the self adhesive resin cement is possible to use as sealer instead of primer & sealant when root canal filled by Resilon.

Comparative study of the cytotoxic effect of resilon against two cell lines

Resilon is a new material that is a candidate to replace gutta-percha as a root filling material. This study evaluated the antiproliferative effect of Resilon and two commercially available gutta-percha points (Roeko, Dentsply). Two established cell lines (L929 and RPC-C2A) were used for the experiment. Cell survival fraction was estimated by the sulforhodamine-B assay, in reference to controls after 48-h exposure. Non-parametric tests (Kruskal-Wallis followed by Dunn's multiple comparisons) were used to evaluate the statistical significance of the results (α=0.05). Cytotoxicity in a descending order was: Resilon > Roeko gutta-percha > Dentsply gutta-percha. At 24-h exposure, no statistically significant differences (p>0.05) were observed between tested materials in both cell lines. At 48-h exposure, statistically significant differences (p<0.05) were found between Resilon and the other materials in the L929 cell line. In the RPC-C2A cell line Resilon was significantly more cytotoxic than Dentsply gutta-percha (p<0.05), but no statistically significant differences (p>0.05) were found between Resilon and Roeko gutta-percha. The cytotoxicity of Resilon increased significantly from 24 h to 48 h in both cell lines. Resilon points were more cytotoxic than gutta-percha points. The cytotoxicity was time dependent and increased after 48 h.

Resilon é um material novo com potencial para substituir a guta-percha como material obturador radicular. Este estudo avaliou o efeito anti-proliferativo do Resilon e de duas marcas comerciais de pontas de guta-percha (Roeko e Dentsply). Para os fins deste estudo foram utilizadas duas linhagens celulares conhecidas (L929 e RPC-C2A). A fração de sobrevivência celular foi estimada pelo método colorimétrico de sulforodamina B comparado aos controles após exposição por 48 h. A significância estatística dos resultados (α=0,05) foi avaliada pelos testes não-paramétricos de Kruskal-Wallis e Dunn para comparações múltiplas. A citotoxicidade dos materiais em ordem decrescente foi: Resilon > guta-percha Roeko > guta-percha Dentsply. Após 24 h de exposição, não foram encontradas diferenças estatisticamente significantes (p>0,05) entre os materiais testados em ambas as linhagens celulares. Após 48 h, o Resilon apresentou um efeito citotóxico significantemente maior (p<0,05) em comparação aos outros dois materiais na linhagem celular L929. Na linhagem RPC-C2A, a citotoxicidade do Resilon foi significantemente maior (p<0,05) que a da guta-percha Dentsply, mas não houve diferenças significantes (p<0,05) entre Resilon e guta-percha Roeko. A citotoxicidade do Resilon aumentou significativamente de 24 para 48 h para ambas as linhagens celulares. As pontas de Resilon foram mais citotóxicas do que as pontas de guta-percha. A citotoxicidade foi tempo-dependente e aumentou após 48 h de exposição.

Evaluation of retrievability using a new soft resin based root canal filling material / 대한치과보존학회지

The aim of this study was to evaluate the retrievability of Resilon as a root canal filling material. Twenty-seven human single-rooted extracted teeth were instrumented utilizing a crown down technique with Gates-Glidden burs and ProFile system. In group1 (n = 12) canals were obturated with gutta percha and AH-26 plus sealer using a continuous wave technique and backfilled. In group 2 (n = 15) Resilon was used as a filling material. Then teeth were sealed and kept in 37degrees C and 100% humidity for 7 days. For retreatment, the samples were re-accessed and filling material was removed using Gates-Glidden burs and ProFiles. Teeth were sectioned longitudinally to compare the general cleanliness and amount of debris (x 75) using SEM. Chi-square test was used (alpha = 0.05) to analyze the data. The total time required for removal of filling materials was expressed as mean +/- SD (min) and analyzed by the Student t-test (alpha = 0.05). Required time for retreatment was 3.25 +/- 0.32 minutes for gutta percha/AH 26 plus sealer and 3.05 +/- 0.34 minutes for Resilon. There was no statistically significant difference between the two experimental groups. There was no significant difference between the groups in the cleanliness of the root canal wall. This study showed that Resilon was effectively removed by Gates-Glidden burs and ProFiles.

Measurement of thermal expansion characteristic of root canal filling materials: Gutta-percha and Resilon / 대한치과보존학회지

The purpose of this study was to evaluate the thermal expansion characteristics of injectable thermoplasticized gutta-perchas and a Resilon. The materials investigated are Obtura gutta-percha, Diadent gutta-percha, E&Q Gutta-percha Bar and Epiphany (Resilon). The temperature at the heating chamber orifice of an Obtura II syringe and the extruded gutta-percha from the tip of both 23- and 20-gauge needle was determined using a Digital thermometer. A cylindrical ceramic mold was fabricated for thermal expansion test, which was 27 mm long, with an internal bore diameter of 3 mm and an outer diameter of 10 mm. The mold was filled with each experimental material and barrel ends were closed with two ceramic plunger. The samples in ceramic molds were heated in a dilatometer over the temperature range from 25degrees C to 75degrees C. From the change of specimen length as a function of temperature, the coefficients of thermal expansion were determined. There was no statistical difference between four materials in the thermal expansion in the range from 35degrees C to 55degrees C (p > 0.05). However, Obtura Gutta-percha showed smaller thermal expansion than Diadent and Metadent ones from 35degrees C to 75degrees C (p < 0.05). The thermal expansion of Epiphany was similar to those of the other gutta-percha groups.

The effect of canal filling with gutta-percha or resilon on Enterococcus faecalis in bovine dentinal tubules / 대한치과보존학회지

The purpose of this study was to observe the effect of canal filling on the bacteria left in the dentinal tubules and to compare the sealing ability between Gutta-percha and Resilon. The bovine dentin block models were prepared. E. faecalis was inoculated to dentin blocks and incubated. The dentin blocks were divided into 5 groups. Group 1 was the negative control. Group 2 was the positive control. Group 3 was filled with ZOE based sealer and Gutta-percha, Group 4 with resin based sealer and Gutta-percha, and Group 5 with resin based sealer and Resilon. After 24 hour, the blocks were incubated at 37degrees C for 1, 2, 3 and 4 weeks on BHI agar plates. The internal dentin portion of the blocks was removed using ISO 027, 029, 031, 035 round burs and the dentin chips were incubated at 37degrees C for 24 hour. Following incubation, the optical density of the medium was measured. The data were statistically analysed using repeated measures ANOVA and one-way ANOVA. The results were as follows, 1. There was statistically significant reduction in the number of E. faecalis of the group where dentinal tubules were completely sealed with nail varnish in comparison with the groups obturated with gutta-percha or resilon (p 0.05). 3. Under the conditions of this experiment, E. faecalis survived up to 4 weeks after obturation with gutta-percha or resilon (p > 0.05).