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Basic Research
- Rheological characterization of thermoplasticized injectable gutta percha and resilon
- Juhea Chang, Seung-Ho Baek, In-Bog Lee
- J Korean Acad Conserv Dent 2011;36(5):377-384. Published online September 30, 2011
- DOI: https://doi.org/10.5395/JKACD.2011.36.5.377
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Abstract
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ePub 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 140℃ and 200℃, 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 modulusG" , loss tangenttan δ, and complex viscosity η* 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 60℃ and 40℃ 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 40℃ to 50℃, 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.
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Citations
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- The investigation of composition and thermal behavior of two types of backfilling gutta-percha
Pai-Chun Huang, Yi-Ting Wu, Yung-Hao Hsu, Szu-Chin Liao, Ya-Hsuan Wang, James L. Gutmann, Haw-Ming Huang, Sung-Chih Hsieh
Journal of Dental Sciences.2023; 18(1): 414. CrossRef - Thermal behavior and viscoelastic properties of gutta-percha used for back-filling the root canal
Yung-Hao Hsu, Hsin-Hui Wang, Yung-Kang Shen, James L. Gutmann, Sung-Chih Hsieh
Journal of Dental Sciences.2020; 15(1): 28. CrossRef - Comparison between Gutta-Percha and Resin-Coated Gutta-Percha using Different Obturation Techniques
Nashwan A. Al-Afifi, Mariam Abdullah, Samah M. Al-Amery, Mohamed Abdulmunem
Journal of Applied Biomaterials & Functional Materials.2016; 14(3): e307. CrossRef - Temperature‐dependent rheological property changes of thermoplastic gutta‐percha root filling materials
H. J. Moon, J. H. Lee, J. H. Ahn, H. J. Song, Y. J. Park
International Endodontic Journal.2015; 48(6): 556. CrossRef
- The investigation of composition and thermal behavior of two types of backfilling gutta-percha
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Original Article
- A comparison of thermoplasticized injectable gutta-percha techniques in ribbon-shaped canals : adaptation to canal walls
- Hyun-sook Hwang, Kyung-mo Cho, Jin-woo Kim
- J Korean Acad Conserv Dent 2002;27(4):411-420. Published online July 31, 2002
- DOI: https://doi.org/10.5395/JKACD.2002.27.4.411
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Abstract
PDFPubReaderePub
The aim of this study is to compare the adaptability of thermoplasticized injectable gutta-percha technique to the canal walls in ribbon-shaped canals.
Thirty resin models simulated ribbon-shape canals were instrumented to #40 using .06 taper Profile systems. Three groups of each 10 resin models were obturated by the lateral condensation technique(LC) and the two thermoplasticized injectable gutta-percha technique; Ultrafil Endoset+Obtura II(EO) and Ultrafil Firmset(UF), respectively.
After resin model were kept at room temperature for 4 days, they were resected horizontally with microtome at 1, 2, 3, 4 and 5mm levels from apex. At each levels, image of resected surface were taken using CCD camera under a stereomicroscope at ×40 magnification and stored. Ratio of the area of gutta-percha was obtained by calculating area of gutta-percha cone to the total area of canal using digitized image-analyzing program. The data were collected then analyzed statistically using One-way ANOVA.
The results were as follows.
1. At 1mm levels, there was no statistically significant difference in the mean ratio of gutta-percha among the groups.
2. At 2mm level, EO showed the highest mean ratio of gutta-percha (p<0.05) and there was no significant difference between LC and UF.
3. At 3, 4, 5mm levels, EO and UF had significantly greater mean ratio of gutta-percha than LC(p<0.05) and there was no significant difference between EO and UF.
In conclusion, the thermoplasticized injectable gutta-percha techniques demonstrated relatively favorable adaptability to canal walls than lateral condensation technique in ribbon-shaped canals except for 1mm level.
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