Surface microhardness of a thermoplasticized light-cured composite resin at different temperatures: in vitro
DOI:
https://doi.org/10.62428/rcvp2025411988Keywords:
Composite resin, thermoplasticization, microhardness, photopolymerizationAbstract
The objective was to analyze the surface microhardness of a light-cured composite resin thermoplasticized at different temperatures in a high-altitude city. This was an in vitro experimental study using the nanofilled composite Filtek Z350XT (3M-ESPE), with a total of 40 specimens divided into 4 groups of 10 each. An AR Heater heating device was used. The device operated for 30 minutes to reach the planned temperatures of 40°C, 50°C, and 70°C; the resin syringe tube was placed in the device for 20 minutes to reach the programmed temperature. The syringe was then removed and the resin was immediately applied in a single increment into a custom-made mold. The samples were light-cured for 10 seconds using the Bluephase N lamp from Ivoclar-Vivadent, with a light intensity of 1200 mW/cm². It was found that Group 4 (70°C) showed statistically significant differences compared to Group 1, which was polymerized at room temperature (13°C), and also showed a significant difference compared to Group 2 (40°C). However, no significant difference was observed when compared to Group 3, which had been thermoplasticized at 50°C. The specimens thermoplasticized at 70°C (60.77 ± 5.65) exhibited significantly higher surface microhardness than those in Group 1 (53.09 ± 5.11) and Group 2 (53.62 ± 5.05), while no statistically significant difference was observed compared to Group 3 (55.76 ± 4.51).
Downloads
References
3M Filtek. (2005). Perfil técnico del producto TM. https://multimedia.3m.com/mws/media/725177O/tpp-filtek-z350-xt.pdf.
Alvarado, G., & Huertas, G. (2020). Resina precalentada como agente cementante: una revisión de tema. CES Odontología, 33(2), 159–174. https://doi.org/10.21615/cesodon.33.2.14
Calza, T. (2017). Influencia del precalentamiento sobre la adaptación interna de restauraciones de resinas compuestas. Estudio in vitro. Revista de la Facultad de Ciencias Médicas de Córdoba, (Supl.). https://doi.org/10.31053/1853.0605.v0.n0.17896
Dias, M., Espíndola-Castro, L., Lins-Filho, P., Teixeira, H., Silva, C., & Guimarães, R. (2020). Influence of different thermopolymerization methods on composite resin microhardness. Journal of Clinical and Experimental Dentistry, 12(4), e335–e341. https://doi.org/10.4317/JCED.56772
Elkaffas, A., Eltoukhy, R., Elnegoly, S., & Mahmoud, S. (2019). The effect of preheating resin composites on surface hardness: a systematic review and meta-analysis. Restorative Dentistry & Endodontics, 44(4). https://doi.org/10.5395/rde.2019.44.e41
Elkaffass, A., Eltoukhy, R., Elnegoly, S., & Mahmoud, S. (2020). Influence of preheating on mechanical and surface properties of nanofilled resin composites. Journal of Clinical and Experimental Dentistry, 12(5), e494–e500. https://doi.org/10.4317/JCED.56469
Hervás García, A., Angel, M., Lozano, M., Cabanes Vila, J., Escribano, A., Galve, P., Adela, D., & García, H. (2006). Resinas compuestas. Revisión de los materiales e indicaciones clínicas. Med Oral Patol Oral Cir Bucal, 11, E215-20. https://scielo.isciii.es/pdf/medicorpa/v11n2/23.pdf
Mohammadi, N., Jafari-Navimipour, E., Kimyai, S., Ajami, A., Bahari, M., Ansarin, M., & Ansarin, M. (2016). Effect of pre-heating on the mechanical properties of silorane-based and methacrylate-based composites. Journal of Clinical and Experimental Dentistry, 18(4), 373–378. https://doi.org/10.4317/jced.52807
Organización Internacional de Normalización [ISO]. (2019). ISO 4049:2019(en)Dentistry — Polymer-based restorative materials. https://www.iso.org/obp/ui/es/#iso:std:iso:4049:ed-5:v1:en
Pirmoradian, M., Hooshmand, T., Jafari-Semnani, S., & Fadavi, F. (2020). Degree of conversion and microhardness of bulk-fill dental composites polymerized by LED and QTH light curing units. Journal of Oral Biosciences, 62(1), 107–113. https://doi.org/10.1016/j.job.2019.12.004
Servicio Nacional de Meteorología e Hidrología del Perú [SENAMHI]. (2020). CLIMAS DEL PERÚ - Mapa de Clasificación Climática Nacional. https://www.senamhi.gob.pe/load/file/01404SENA-4.pdf
Servicio Nacional de Meteorología e Hidrología del Perú [SENAMHI]. (2022). Boletín Agro Hidroclimático mensual DZ 11. https://www.senamhi.gob.pe/load/file/04501SENA-111.pdf
Sharafeddin, F., Motamedi, M., & Fattah, Z. (2015a). Effect of Preheating and Precooling on the Flexural Strength and Modulus of Elasticity of Nanohybrid and Silorane-based Composite. J Dent Shiraz Univ Med Sci, 16(3). https://www.scienceopen.com/document?vid=08daf9e5-c1f2-4d6b-84e4-975384602e23
Tantbirojn, D., Chongvisal, S., Augustson, D., & Versluis, A. (2011). Hardness and postgel shrinkage of preheated composites. Quintessence International, 42(3), e51-9. https://pubmed.ncbi.nlm.nih.gov/21465004/
Xue, J., & Yang, B. (2019). Effect of preheating on the properties of resin composite. West China Journal of Stomatology, 37(6), 571–576. https://doi.org/10.7518/hxkq.2019.06.001
Published
How to Cite
Issue
Section
License
Copyright (c) 2025 Gilmer Solís Condor
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Usted es libre de:
- Compartir: copiar y redistribuir el material en cualquier medio o formato.
- Adaptar: remezclar, transformar y desarrollar el material.
- El licenciante no puede revocar estas libertades siempre y cuando usted cumpla con los términos de la licencia.
Bajo los siguientes términos:
- Atribución: Debe otorgar el crédito correspondiente , proporcionar un enlace a la licencia e indicar si se realizaron cambios. Puede hacerlo de cualquier manera razonable, pero no de forma que sugiera que el licenciante lo respalda a usted o su uso.
- No comercial: No está permitido utilizar este material con fines comerciales.
- Compartir Igual: si remezcla, transforma o crea obras derivadas del material, debe distribuir sus contribuciones bajo la misma licencia que el original.
- Sin restricciones adicionales: no podrá aplicar términos legales ni medidas tecnológicas que restrinjan legalmente a otros para que no hagan nada de lo que permite la licencia.
