Impact of refrigeration on the surface hardness of hybrid and microfilled composite resins

Osternack, Fernando Henrique Ruppel; Caldas, Danilo Biazzetto de Menezes; Rached, Rodrigo Nunes; Vieira, Sérgio; Platt, Jeffrey A.; Almeida, Janaina Bertoncelo de

doi:10.1590/s0103-64402009000100007

Cited by 15 publications

(17 citation statements)

References 16 publications

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“…Thus a slowdown in the polymerization processes take place determining the final degree of conversion; therefore less unreacted residual monomer remains free so better mechanical properties. These come in agreement with Daronch et al (17), Osternack et al (12), Jin and Kim (39). But was disagreement with Didron et al (38) and Torres et al (10) stating that the preheating composite resins have no significant effect on microhardness, who demonstrated the strong influence of composite temperature on polymerization contraction behavior of dental resin composites.…”

Section: Discussionsupporting

confidence: 92%

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Effect of Preheating on Microleakage and Microhardness of Composite Resin (An in Vitro Study)

L²,

A³

2016

Alexandria Dental Journal

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INTRODUCTION: advancements in composite restorations have been suggested, including preheating of composite resins before photo polymerization by a heating device. OBJECTIVE: The aim of the study was to investigate the effect of preheating before curing on microleakage and microhardness of composite resins. MATERIALS AND METHODS: thirty extracted human molars were used for microleakage assessment. Sixty class V cavities were made in the buccal and lingual surfaces of teeth, and were randomly divided into three groups according to temperature of composite (Group I: 10 °C, Group II: 24°C, and Group III: 54-60°C). Each group is further divided into two subgroups according to the type of composite (nanohybrid composite (Grandio Voco Germany), and microhybrid composite (Z250 3M Espe), where subgroups (IA, IIC and IIIE received nanohybrid composite), and subgroups (IB, IID and IIIF received microhybrid composite). Microleakage was determined by dye penetration test with scoring criteria from (0-3).sixty composite discs were used in vickers microhardness test (VHN),with same experimental grouping as used in microleakage assessment. VHN was determined using calibrated Vickers indenter. Data were collected, tabulated and statistically analyzed by using ANOVA F-test and Chi-square test (p<0.05). RESULTS: concerning microleakage ; there was no significant difference between the groups. The cervical margins showed more microleakage than the occlusal margins. The least microleakage was obtained in subgroup IIIE with mean 0.5 ± 1.08 in 80% of specimens occlusaly and, also IIIE showed the least microleakage in 50% of cases with mean 1 ± 1.25 cervically. Concerning top microhardness; subgroups IA obtained the highest mean top VHN 113.35 ±10.1 followed by subgroup IIIE 108.43 ±1.52.While regarding bottom microhardness subgroup IIC obtained the highest mean bottom VHN 88.49± 1.29, followed by subgroup IA with mean value85.49 ± 9.69. CONCLUSION: it was concluded that preheating enhanced microhardness of composite resin materials, but have no effect on microleakage.

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Section: Discussionsupporting

confidence: 92%

“…The Vickers microhardness test (VHN) has been commonly used to evaluate the hardness of dental materials, as it is usually used for brittle materials and small film thickness materials. Hardness tests are the most frequently used method to evaluate the curing depth and the polymer cross-linking of dental composites (9)(10)(11)(12).…”

Section: Introductionmentioning

confidence: 99%

Effect of Preheating on Microleakage and Microhardness of Composite Resin (An in Vitro Study)

L²,

A³

2016

Alexandria Dental Journal

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“…Daronch, et al 7 (2006) had shown that the clinician should wait at least 11 minutes before using composite stored at 3.5±0.1º C. Osternack, et al 23 (2009) showed similar top surface hardness values for the groups tested at room temperature and 15 minutes after removal from the refrigerator. If the option is the use of the technique of pre-heating, this seems to restore the characteristics of the material, at least with respect to the values of sorption and solubility.…”

Section: Discussionmentioning

confidence: 99%

“…The refrigerated storage and immediate use of the material after removal from the refrigerator can cause the material to achieve low degrees of conversion and entanglement of small chains, which leads to increased sorption and solubility. The literature has recommended to keep the composite outside the refrigerator for a period of time before using it, so that it reaches room temperature 5,7,23 .…”

Section: Introductionmentioning

confidence: 99%

Temperature and curing time affect composite sorption and solubility

et al. 2013

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Objective:This study evaluated the effect of temperature and curing time on composite sorption and solubility. Material and Methods:Seventy five specimens (8x2 mm) were prepared using a commercial composite resin (ICE, SDI). Three temperatures (10º C, 25º C and 60º C) and five curing times (5 s, 10 s, 20 s, 40 s and 60 s) were evaluated. The specimens were weighed on an analytical balance three times: A: before storage (M1); B: 7 days after storage (M2); C: 7 days after storage plus 1 day of drying (M3). The storage solution consisted of 75% alcohol/25% water. Sorption and solubility were calculated using these three weights and specimen dimensions. The data were analyzed using the Kruskal-Wallis and Mann-Whitney U Tests (α=5%). Results:The results showed that time, temperature and their interaction influenced the sorption and solubility of the composite (p<0.05). At 60º C, the composite sorption showed an inverse relationship with the curing time (p<0.05). The composite cured for 5 s showed higher sorption for the 40 s or 60 s curing times when compared with all temperatures (p<0.05). Curing times of 20 s and 40 s showed similar sorption data for all temperatures (p>0.05). The 60º C composite temperature led to lower values of sorption for all curing times when compared with the 10º C temperature (p<0.05). The same results were found when comparing 10º C and 25º C (p<0.05), except that the 20 s and 40 s curing times behaved similarly (p>0.05). Solubility was similar at 40 s and 60 s for all temperatures (p>0.05), but was higher at 10º C than at 60º C for all curing times (p<0.05). When the composite was cured at 25º C, similar solubility values were found when comparing the 5 s and 10 s or 20 s and 40 s curing times (p>0.05). Conclusion:In conclusion, higher temperatures or longer curing times led to lower sorption and solubility values for the composite tested; however, this trend was only significant in specific combinations of temperature and curing times.

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“…Karena suhu panas akan menurunkan viskositas dan meningkatkan pergerakan monomer. 10 Untuk memperpanjang waktu simpan, produsen resin komposit menginstruksikan untuk menyimpan bahan tersebut pada suhu 23°-4°C jika tidak digunakan. Instruksi ini telah dilakukan oleh dokter gigi dengan menyimpan resin komposit di dalam lemari pendingin.…”

Section: Abstrakunclassified

Pengaruh suhu penyimpanan terhadap kedalaman pengerasan dan kekuatan resin komposit

Harahap

2019

Intisari Sains Medis

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Introduction: Temperature plays a role in polymerization process of composite resin. Depth of cure is often used as a marker of polymerization adequacy in composite resins. Adequate polymerization will increase the mechanical properties of composite resin. The aim of this study was to evaluate the effect of storage temperature on depth of cure and compressive strength of composite resin. Method: Samples were made from nanofiller composite resin (Filtek Z350 XT,3M,ESPE,USA) after the materials were stored at 4°C and 24°C for two weeks. Twenty samples of nanofiller composite resins for each test group were prepared using metal mould with 6 mm in diameter and 4 mm thick. Samples were cured under visible blue light for 20 second. The polymerized composite resin was measured for determining the depth of cure. Compressive strength of samples was tested by using Universal Testing Machine. Result: The results showed that depth of cure value of 24°C (3.90 ± 0.07 mm) was higher than 4°C (3.83 ± 0.17 mm) and compressive strength of 24°C (35.20 ± 4.63 MPa) was higher than 4°C (26.47 ± 3.13 MPa). Statistical analysis showed that depth of cure were no siginificant differences (p > 0.05) but in compressive strength were significant differences between test groups (p < 0.05). Conclusion: Storage temperature can affect the depth of cure and compressive strength of composite resin, although no significant difference on the depth of cure.

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Impact of refrigeration on the surface hardness of hybrid and microfilled composite resins

Cited by 15 publications

References 16 publications

Effect of Preheating on Microleakage and Microhardness of Composite Resin (An in Vitro Study)

Effect of Preheating on Microleakage and Microhardness of Composite Resin (An in Vitro Study)

Temperature and curing time affect composite sorption and solubility

Pengaruh suhu penyimpanan terhadap kedalaman pengerasan dan kekuatan resin komposit

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