Temperature Changes in Composite Materials during Photopolymerization

Szalewski, Leszek; Szalewska, Magdalena; Jarosz, Paweł; Woś, Michał; Szymańska, Jolanta

doi:10.3390/app11020474

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…An acrylic resin matrix was used to apply the resin composites. When one exposure time was used (5, 10 s), they found that the continuous mode and pulse mode produced similar temperature rise values (14, 15.5℃ respectively) [40]. These results do not agree with those of our study, which may be because that study neglected the effect of dentin on temperature rise.…”

Section: Discussioncontrasting

confidence: 84%

Effect of Light Curing Modes of High-Powered LEDs on Temperature Rise under Primary Teeth Dentin (An In Vitro Study)

2022

JODH

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Background: Temperature rise in the pulp chamber is a severe stress that can cause irreversible damage to the pulp. This study aimed to evaluate the effect of three curing modes of a high-powered LED and two remining dentin thicknesses on the temperature rise under primary teeth dentin. Methods: One dentin disc of 1 mm thickness were prepared from human primary molar. The dentin disc was exposed to curing light using a high-powered LED for 10 s to simulate bonding agent polymerization (stage 1 curing). Five specimens of resin composite were cured for 20 s. The different modes tested were standard, ramp, and pulse mode (n=5). After that the dentin disc was grinded to 0.5 mm thick and the experiments were repeated. Temperature change data were subjected to analysis of variance (ANOVA) and Tukey's test. Results: The highest temperature rise was observed under the 0.5-mm-thick dentin disc with standard mode (7.6±0.234; 4.78±0.4207), whereas the lowest values were recorded with pulse mode under 1-mm-thick dentin (4.8±0.458; 3.16±0.829) during stage 1 curing and resin composite polymerization, respectively. Pulse mode produced a significantly lower values compared to standard mode in all conditions (P<0.05). An inverse proportion was found between the mean temperature rise values and the dentin thickness. Conclusions: High-powered LEDs should not be used to cure bonding agents in deep cavities. The maximum temperature rise induced by a high-powered LED during resin composite polymerization was not critical for pulpal health. Temperature rise related to dentin thickness and curing modes.

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Section: Discussioncontrasting

confidence: 84%

Effect of Light Curing Modes of High-Powered LEDs on Temperature Rise under Primary Teeth Dentin (An In Vitro Study)

2022

JODH

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“…Szalewski et al 40 measured the temperatures following polymerization of resin composites with seven curing modes (four continuous modes with exposure times of 3-5-10 and 20 s, two pulse modes with exposure times of 5 and 10 s, and soft-start mode). an acrylic resin matrix was used to apply the resin composites.…”

Section: Discussionmentioning

confidence: 99%

Effect of light curing modes of high-powered LEDs on temperature rise under primary teeth dentin (an in vitro study)

Jabbour¹,

Alfares²

2022

Preprint

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Background. Temperature rise in the pulp chamber is a severe stress that can cause irreversible damage to the pulp. This study aimed to evaluate the effect of three curing modes of a high-powered LED and two remining dentin thicknesses on the temperature rise under primary teeth dentin. Methods. One dentin disc of 1 mm thickness was prepared from human primary molar. The dentin disc was exposed to curing light using a high-powered LED for 10 s to simulate bonding agent polymerization (stage 1 curing). Five specimens of resin composite were cured for 20 s. The different modes tested were standard, ramp, and pulse mode (n = 5). After that, the dentin disc was adapted to 0.5 mm thick, and the experiments were repeated. Temperature change data were subjected to analysis of variance (ANOVA) and Tukey's test. Results. The highest temperature rise was observed under the 0.5-mm-thick dentin disc with standard mode (7.6 ± 0.2; 4.7 ± 0.4), whereas the lowest values were recorded with pulse mode under 1-mm-thick dentin (2.7 ± 0.1; 2.5 ± 0.2) during stage 1 curing and resin composite polymerization, respectively. Pulse mode produced significantly lower values than standard mode in all conditions (P < 0.05). An inverse proportion was found between the mean temperature rise values and the dentin thickness. Conclusions. High-powered LEDs should not be used to cure bonding agents in deep cavities. The maximum temperature rise induced by a high-powered LED during resin composite polymerization was not critical for pulpal health. Temperature rise related to dentin thickness and curing modes.

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“…The initiation systems and translucency properties of bulk-fill composites (BFC) promise an increased depth of cure. Extended polymerization durations are more likely to lead to the critical temperature values for pulp damage than short polymerization durations, suggesting that the use of bulk-fill composites in the restoration of deep Class II cavities is advantageous to preserve pulp health [ 9 ]. Stress-reliever technologies result in the reduction of polymerization shrinkage stresses.…”

Section: Introductionmentioning

confidence: 99%

Microleakage and Marginal Integrity of Ormocer/Methacrylate-Based Bulk-Fill Resin Restorations in MOD Cavities: SEM and Stereomicroscopic Evaluation

et al. 2023

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This in vitro study aimed to compare the microleakage and marginal integrity of methacrylate/ormocer-based bulk-fill composite (BFC) restorations used in cervical marginal relocation with two different layering thicknesses in mesio-occlusal-distal (MOD) cavities exposed to thermo-mechanical loading. Standard MOD cavities were prepared in 60 mandibular molars and assigned into three groups: x-tra fil/AF + x-tra base/XB, Tetric N-Ceram Bulk Fill/TNB + Tetric N-Flow Bulk Fill/TFB, and Admira Fusion x-tra/AFX + Admira Fusion x-base/AFB. Each group was further divided into two subgroups (2 mm and 4 mm) based on the thickness of flowable BFCs (n = 10). The specimens were subjected to thermo-mechanical loading (240,000 cycles) and immersed in 0.2% methylene blue. Following mesiodistal sectioning, the specimens were examined under stereomicroscope (×25) and scored (0–3) for microleakage. Marginal integrity was examined using a scanning electron microscope (SEM). Descriptive statistical methods and the chi-square test were used to evaluate the data (p < 0.05). While there was no statistically significant difference in gingival cement microleakage in the XB and AFB specimens with a 4 mm thickness, microleakage was significantly increased in the TFB specimen (p = 0.604, 0.481, 0.018 respectively). A significantly higher amount of score 0 coronal microleakage was detected in the AFX2 mm + AFB4 mm compared to the TNB2 mm + TFB4 mm (p = 0.039). The SEM examination demonstrated better marginal integrity in groups with 2 mm thick flowable BFCs. Ormocer and methacrylate-based materials can be used in marginal relocation with thin layers.

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Temperature Changes in Composite Materials during Photopolymerization

Cited by 10 publications

References 28 publications

Effect of Light Curing Modes of High-Powered LEDs on Temperature Rise under Primary Teeth Dentin (An In Vitro Study)

Effect of Light Curing Modes of High-Powered LEDs on Temperature Rise under Primary Teeth Dentin (An In Vitro Study)

Effect of light curing modes of high-powered LEDs on temperature rise under primary teeth dentin (an in vitro study)

Microleakage and Marginal Integrity of Ormocer/Methacrylate-Based Bulk-Fill Resin Restorations in MOD Cavities: SEM and Stereomicroscopic Evaluation

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