The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform
Giuseppe Spoto - One of the best experts on this subject based on the ideXlab platform.
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Thermal analysis of laser-softened Gutta-percha.
Journal of biological regulators and homeostatic agents, 2012Co-Authors: Morena Petrini, M Ferrante, Paolo Trentini, G Perfetti, P Dottore, Giuseppe SpotoAbstract:The aim of this work is to examine the behaviour of laser treated Gutta-percha (ab) after heating, to test the validity of a new obturation technique. Samples of laser- and no laser- treated Gutta-percha have been examined by the thermal/thermogravimetric analysis and compared. All samples have been submitted to four runs of heating from the temperature of 25130 C, followed by spontaneous cooling. It was found that some samples have shown the typical behaviour of the alpha-Gutta-percha; others have shown characteristics similar to the conventional beta-Gutta-percha. The laser treated Gutta-percha has shown a significant mass loss after the first run of heating, while the mass tends to stabilize after the third run. It has been demonstrated that the 980 nm diode laser used with cited parameters does not alters thermal behaviour of Gutta-percha cones.
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Thermal analysis of commercial Gutta-percha
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: M Ferrante, Paolo Trentini, Fausto Croce, Morena Petrini, Giuseppe SpotoAbstract:The aim of this work is to examine the behaviour of Gutta-percha (α–β) after heating, because of the several techniques using the warm Gutta-percha as root canal filling material. Samples of Gutta-percha have been examined by the thermal analysis. The Gutta-percha has been submitted to four runs of heating from the temperature of 25–130 °C, followed by spontaneous cooling. It was found that some products have shown the typical behaviour of the α-Gutta-percha; some materials have shown characteristics similar to the conventional β-Gutta-percha. The samples have shown a significant mass loss after the first run of heating, while the mass tends to stabilize after the third run. Heating of Gutta-percha up to 130 °C causes physical changes; this is due to the presence of additives, which alter the behaviour of the material.
Zhang Wei - One of the best experts on this subject based on the ideXlab platform.
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Advance of warm Gutta-percha obturation techniques
Chinese Journal of Conservative Dentistry, 2003Co-Authors: Zhang WeiAbstract:Recently,warm Gutta-percha root canal obturation techniques have been researched and used widely.The categories include warm Gutta-percha compaction,thermomechanical compaction,injectable Gutta-percha obturation and solid-cone carry insertion.This study is to review the principles,improvements,advantages and drawbacks of these techniques for clinical reference.
Josette Camilleri - One of the best experts on this subject based on the ideXlab platform.
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sealers and warm Gutta percha obturation techniques
Journal of Endodontics, 2015Co-Authors: Josette CamilleriAbstract:Abstract Introduction Warm vertically compacted Gutta-percha obturation techniques use root canal sealers that are heated during the obturation. This study aims at investigating the suitability of selected sealers with warm Gutta-percha obturation techniques. Methods The composition of an experimental sealer (Septodont; Saint Maur-des-Fosses, France), MTA Fillapex (Angelus, Londrina, Brazil), Apexit Plus (Ivoclar, Schaan, Lichtenstein), and AH Plus (Dentsply International, Addlestone, UK) was assessed by scanning electron microscopic and energy-dispersive spectroscopic analysis. The effect of temperature during warm vertical compaction technique was investigated by testing the sealers' properties after 1 minute to 100°C or 37°C. The reaction products after setting were assessed by X-ray diffraction analysis and Fourier transform infrared spectroscopy. Changes in setting time, flow, and film thickness were determined using ISO 6876 (2012) specifications. Results The experimental tricalcium silicate–based sealer and Apexit Plus contained calcium hydroxide peaks after setting, which were absent in MTA Fillapex. The properties of AH Plus and the experimental sealer were modified by heat; the setting time was reduced, and film thickness increased. AH Plus had diminished N-H groups when heated to 100°C for 1 minute. MTA Fillapex, Septodont sealer, and Apexit Plus were unaffected by heat application. Conclusions The choice of sealer should be considered when selecting the obturation technique. The Septodont sealer is recommended for obturations using cold laterally condensed Gutta-percha, whereas MTA Fillapex and Apexit Plus were suitable with warm Gutta-percha obturation techniques.
James L. Gutmann - One of the best experts on this subject based on the ideXlab platform.
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Thermal behavior and viscoelastic properties of Gutta-percha used for back-filling the root canal.
Journal of dental sciences, 2019Co-Authors: Yung Hao Hsu, Yung Kang Shen, James L. Gutmann, Hsin Hui Wang, Sung Chih HsiehAbstract:Abstract Background/purpose In clinical operations, qualitative differences in the texture and operational feeling of the regular type and soft type back-filled Gutta-percha are readily discernible. This study aimed to investigate and compare the thermal behavior and physical properties of the two Gutta-percha materials. Materials and methods The chemical compositions of regular and soft type Gutta-percha Obturator® pellets were examined via energy dispersive X-ray spectroscopy. The thermal behaviors of the pellets during heating and cooling were evaluated using a differential scanning calorimeter. Finally, the viscoelastic properties of the two materials during cooling were assessed using a modular compact rheometer. Results The soft type Gutta-percha contained a greater atomic percentage of zinc than the regular type material. In addition, the soft type Gutta-percha exhibited exothermic peaks during cooling, whereas the regular type Gutta-percha did not. The two materials exhibited different viscoelastic behaviors under cooling. In particular, the rate of change of the loss factor for the soft type Gutta-percha was more than that of the regular type Gutta-percha at temperature lower than 80°C. Conclusion The soft type Gutta-percha underwent significant crystallization during cooling, and therefore exhibited pronounced volume shrinkage. Furthermore, the soft type Gutta-percha underwent a greater rate of change in viscoelasticity under cooling than the regular type Gutta-percha, and exhibited poorer physical stability. Consequently, in the back-packing procedure, soft type Gutta-percha must be compacted more often over time than regular type Gutta-percha to ensure the same quality of root canal obturation.
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a comparison of four Gutta percha filling techniques in simulated c shaped canals
International Endodontic Journal, 2015Co-Authors: W K M Soo, Y L Thong, James L. GutmannAbstract:Aim:To compare four Gutta-percha filling techniques in simulated C-shaped canals based on filling quality at three cross-sectional levels, filling time and the apical extrusion of Gutta-percha. Methodology:Forty resin simulated C-shaped canals were constructed and filled using one of four techniques: cold lateral compaction (LC), ultrasonic compaction (UC), single cone with injectable Gutta-percha (Obtura II) (IT) and core-carrier (Thermafil((R))) (CC). Cross sections were made at 1 (L1), 3 (L3) and 6 (L6) mm from the canal terminus. Areas of Gutta-percha, sealer and voids in each cross section were measured using an image analysis system. Data were analysed using a univariate general linear model and post hoc test (Dunnett's T3). Data on time taken to fill canals was evaluated using the Bonferroni post hoc test. Results: CC had more Gutta-percha and less sealer compared with IT at L1 (P<0.05). LC had marginally significantly less Gutta-percha than CC at this level (P=0.049). At level 3mm, significantly more Gutta-percha and less sealer were present in IT compared with LC (P<0.05). The techniques showed no difference in quality at L6. The time for LC (20.72min) was three times longer than for both IT (6.11min) and CC (6.67min), whereas for UC (26.92min), it was four times longer (P<0.001). Finally, the four techniques were not different in the occurrence of apical extrusion of Gutta-percha. Conclusions:The core-carrier technique was the most effective technique when assessed by Gutta-percha area in this simulated C-shaped canal.
Morena Petrini - One of the best experts on this subject based on the ideXlab platform.
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Thermal analysis of laser-softened Gutta-percha.
Journal of biological regulators and homeostatic agents, 2012Co-Authors: Morena Petrini, M Ferrante, Paolo Trentini, G Perfetti, P Dottore, Giuseppe SpotoAbstract:The aim of this work is to examine the behaviour of laser treated Gutta-percha (ab) after heating, to test the validity of a new obturation technique. Samples of laser- and no laser- treated Gutta-percha have been examined by the thermal/thermogravimetric analysis and compared. All samples have been submitted to four runs of heating from the temperature of 25130 C, followed by spontaneous cooling. It was found that some samples have shown the typical behaviour of the alpha-Gutta-percha; others have shown characteristics similar to the conventional beta-Gutta-percha. The laser treated Gutta-percha has shown a significant mass loss after the first run of heating, while the mass tends to stabilize after the third run. It has been demonstrated that the 980 nm diode laser used with cited parameters does not alters thermal behaviour of Gutta-percha cones.
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Thermal analysis of commercial Gutta-percha
Journal of Thermal Analysis and Calorimetry, 2010Co-Authors: M Ferrante, Paolo Trentini, Fausto Croce, Morena Petrini, Giuseppe SpotoAbstract:The aim of this work is to examine the behaviour of Gutta-percha (α–β) after heating, because of the several techniques using the warm Gutta-percha as root canal filling material. Samples of Gutta-percha have been examined by the thermal analysis. The Gutta-percha has been submitted to four runs of heating from the temperature of 25–130 °C, followed by spontaneous cooling. It was found that some products have shown the typical behaviour of the α-Gutta-percha; some materials have shown characteristics similar to the conventional β-Gutta-percha. The samples have shown a significant mass loss after the first run of heating, while the mass tends to stabilize after the third run. Heating of Gutta-percha up to 130 °C causes physical changes; this is due to the presence of additives, which alter the behaviour of the material.