Effect of Preheat Temperatures on Mechanical Properties and Polymerization Contraction Stress of Dental Composites

Didron, Pavinee Padipatvuthikul; Ellakwa, Ayman; Swain, Michael V.

doi:10.4236/msa.2013.46048

Cited by 11 publications
(16 citation statements)

References 37 publications

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“…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. Didron et al (38) pointed out that Preheating composites to higher temperature significantly increased the rate of polymerization and polymerization contraction stress.…”

Section: Discussionmentioning
confidence: 85%

“…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. Didron et al (38) pointed out that Preheating composites to higher temperature significantly increased the rate of polymerization and polymerization contraction stress. The increased stress at elevated temperature seems to be a consequence of the system thermal contraction rather than an increase in materials' conversion, since the composites' mechanical properties were not significantly improved at elevated temperatures (13,30).…”

Section: Discussionmentioning
confidence: 85%

“…However, increased conversion of preheated composite resulted in enhanced restoration properties such as microhardness as was suggested by Torres et al (10). On the contrary, Didron et al (38) demonstrated that the preheating composite resins have no significant effect on microhardness.…”

Section: Discussionmentioning
confidence: 99%

See 2 more Smart Citations
Effect of Preheating on Microleakage and Microhardness of Composite Resin (An in Vitro Study)
M
¹
,
L²,
A³
2016
Alexandria Dental Journal
10
0
3
0
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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: Discussionmentioning
confidence: 85%

See 1 more Smart Citation
Effect of Preheating on Microleakage and Microhardness of Composite Resin (An in Vitro Study)
M
¹
,
L²,
A³
2016
Alexandria Dental Journal
10
0
3
0
View full text Add to dashboard Cite
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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“…Consequently, the reduced depth of cure of siloranebased composites is reflected in their reduced hardness. 18 [21][22][23][24] On the contrary, a study conducted by Didron et al, concluded that preheating showed no significant effect on microhardness 25 found that preheating have. Shade and brand of the composite resin is also responsible for varied degree of conversion which explain the different findings of above-mentioned studies.…”

Section: Degree Of Conversionmentioning
confidence: 99%

Preheated composite: Innovative approach for aesthetic restoration
Asani¹,
Gade²,
Umale³
et al. 2021
ADR
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Resin-based composites are today one of the most widely used restorative materials. However, its most debilitating problem is volumetric shrinkage due to polymerization which may result in contraction stress and subsequent micro leakage and adhesion failure. Preheating composites prior to polymerisation have several advantages over conventional composites. This review article highlights the mechanical properties, advantages and significance of preheated composites.

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“…Commonly used highly filled composite resins that have high viscosity pose problems in relation to placement in the cavity and adaptation. 4 One of the techniques suggested to solve the adaptation problems and reduction of microleakage is to use a liner of flowable composite resin before placing the conventional composite resin in the cavity preparation. 5 Flowable composite resins are not as durable as high-viscosity composite resins, due to their low filler content.…”

Section: Introductionmentioning
confidence: 99%

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations
P¹,
F²,
Navimipour³
et al. 2017
J Dent Res Dent Clin Dent Prospects
14
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11
0
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Background. One of the problems with composite resin restorations is gap formation at resin‒tooth interface. The present study evaluated the effect of preheating cycles of silorane- and dimethacrylate-based composite resins on gap formation at the gingival margins of Class V restorations.Methods. In this in vitro study, standard Class V cavities were prepared on the buccal surfaces of 48 bovine incisors. For restorative procedure, the samples were randomly divided into 2 groups based on the type of composite resin (group 1: di-methacrylate composite [Filtek Z250]; group 2: silorane composite [Filtek P90]) and each group was randomly divided into 2 subgroups based on the composite temperature (A: room temperature; B: after 40 preheating cycles up to 55°C). Marginal gaps were measured using a stereomicroscope at ×40 and analyzed with two-way ANOVA. Inter- and intra-group comparisons were analyzed with post-hoc Tukey tests. Significance level was defined at P < 0.05.Results. The maximum and minimum gaps were detected in groups 1-A and 2-B, respectively. The effects of composite resin type, preheating and interactive effect of these variables on gap formation were significant (P<0.001). Post-hoc Tukey tests showed greater gap in dimethacrylate compared to silorane composite resins (P< 0.001). In each group, gap values were greater in composite resins at room temperature compared to composite resins after 40 preheating cycles (P<0.001).Conclusion. Gap formation at the gingival margins of Class V cavities decreased due to preheating of both composite re-sins. Preheating of silorane-based composites can result in the best marginal adaptation.

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Effect of Preheat Temperatures on Mechanical Properties and Polymerization Contraction Stress of Dental Composites

Abstract:
Objectives: The purpose of this study was to investigate the effect of preheat temperatures on polymerization contraction stress and mechanical properties of three resin composites. Show more

Cited by 11 publications

References 37 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)

Preheated composite: Innovative approach for aesthetic restoration

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

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Effect of Preheat Temperatures on Mechanical Properties and Polymerization Contraction Stress of Dental Composites

Abstract: Objectives: The purpose of this study was to investigate the effect of preheat temperatures on polymerization contraction stress and mechanical properties of three resin composites. Show more

Cited by 11 publications

References 37 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)

Preheated composite: Innovative approach for aesthetic restoration

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

Contact Info

Product

Resources

About

Abstract:
Objectives: The purpose of this study was to investigate the effect of preheat temperatures on polymerization contraction stress and mechanical properties of three resin composites. Show more