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Influence of storage temperature on vickers microhardness of resin composite


Objective: The purpose of this study is to evaluate the effect of three storage temperatures on microhardness of high- and low-viscosity bulk-fill materials and compare them with conventional resin-based composite materials.Material and Methods: Six composite resin-based materials were used in this study (TN, TNB, TNF, FZ250, FB, and FBF), samples were subdivided into three groups based on the pre-curing storage temperature (5°C, 23°C, 37°C). Light polymerization for each material was performed based on the manufacturer’s recommendation using a Bluephase G2 curing unit (Ivoclar Vivadent, Schaan, Liechtenstein) in a high-intensity mode with an irradiance of 1200 mW/cm2. Vickers hardness values of the top and the bottom surfaces of each sample were evaluated using a NOVA 130series, Vickers and Knoop hardness testing instrument under a 200-gram load and a dwell time of 10 seconds.Results: When the tested materials were stored at room temperature (23°C) before testing in the present study, they failed to reach the minimum 80% of the mean bottom to top hardness value ratio except for FZ250 and FBF, where they reached 97.8% and 83.2% respectively.Conclusion: Despite the promising results from this preliminary study, regarding improvement of microhardness with refrigerated composite resins, further research has to be conducted. The enhancement of hardness values associated with preheated composites could be beneficial in countries with warm climates, such as Saudi Arabia.


  1. Lazarchik DA. Hardness comparison of bulk-filled/transtooth
  2. and incremental-filled/occlusally irradiated composite
  3. resins. J Prosthet Dent 2007;98: 129-40.
  4. Burgess J, Cakir D. Comparative properties of low-shrinkage
  5. composite resins. Compend Contin Educ Dent
  6. ;2: 10-15.
  7. Ilie N, Hickel R. Investigations on a methacrylate-based
  8. flowable composite based on the SDR technology.
  9. Dent Mater 2011;27: 348-355.
  10. Ilie N, Kessler A, Durner J. Influence of various irradiation
  11. processes on the mechanical properties and polymerisation
  12. kinetics of bulk-fill resin based composites. J Dent
  13. ;41: 695-702.
  14. Leprince JG. Physico-mechanical characteristics of
  15. commercially available bulk-fill composites. J Dent
  16. ;42: 993-1000.
  17. Scougall-Vilchis RJ. Examination of composite resins
  18. with electron microscopy, microhardness tester and
  19. energy dispersive x-ray microanalyzer. Dent Mater J
  20. ;28: 102-112.
  21. Faltermeier A. Influence of filler level on the bond strength
  22. of orthodontic adhesives Angle Orthod 2007;77: 494-498.
  23. Czasch P, Ilie N. In vitro comparison of mechanical
  24. properties and degree of cure of bulk-fill composites.
  25. Clin Oral Investig 2013;17: 227-235.
  26. Bucuta S, Ilie N. Light transmittance and micromechanical
  27. properties of bulk-fill vs. conventional resin
  28. based composites. Clin Oral Investig 2014;18: 1991-2000.
  29. Uctasli MB. Effect of preheating on the mechanical properties
  30. of resin composites. Eur J Dent 2008;2: 263-268.
  31. Walter R. Effects of temperature on composite resin
  32. shrinkage. Quintessence Int 2009;40: 843-847.
  33. Daronch MFA, Rueggeberg, De Goes MF. Monomer
  34. conversion of pre-heated composite. J Dent Res
  35. ;84: 663-667.
  36. Knight JS, Fraughn R, Norrington D. Effect of
  37. temperature on the flow properties of resin composite.
  38. Gen Dent 2006;54: 14-16.
  39. Lee JH, Um CM, Lee IB. Rheological properties of resin
  40. composites according to variations in monomer and filler
  41. composition. Dent Mater 2006;22: 515-526.
  42. Mjor IA, Gordan VV. Failure, repair, refurbishing and
  43. longevity of restorations. Oper Dent 2002;27: 528-534.
  44. Daronch M. Polymerization kinetics of pre-heated
  45. composite. J Dent Res 2006;85: 38-43.
  46. Bagis YH, Rueggeberg FA. Effect of post-cure
  47. temperature and heat duration on monomer
  48. conversion of photo-activated dental resin composite.
  49. Dent Mater 1997;13: 228-232.
  50. Lucey S. Effect of pre-heating on the viscosity and
  51. microhardness of a resin composite. J Oral Rehabil
  52. ;37: 278-282.
  53. Muñoz C. Effect of pre-heating on depth of cure and
  54. surface hardness of light-polymerized resin composites.
  55. Am J Dent 2008;21: 215-222.
  56. Deb S. Pre-warming of dental composites. Dent Mater
  57. ;27: e51-59.
  58. Osternack FH. Effects of preheating and precooling on the
  59. hardness and shrinkage of a composite resin cured with
  60. QTH and LED. Oper Dent 2013;38: E1-8.
  61. Daronch M. Clinically relevant issues related to preheating
  62. composites. J Esthet Restor Dent 2006;18: 340-350.
  63. Bausch JR, de Lange C, Davidson CL. The influence of
  64. temperature on some physical properties of dental
  65. composites. J Oral Rehabil 1981;8: 309-317.
  66. Hagge SM. Effect of refrigeration on shear bond strength
  67. of three dentin bonding systems. American J Dent
  68. : 131-133.
  69. Flury S. Depth of cure of resin composites: is the ISO
  70. method suitable for bulk-fill materials?. Dent Mater
  71. ;28: 521-528.
  72. Poggio C. Evaluation of Vickers hardness and depth of
  73. cure of six composite resins photo-activated with different
  74. polymerization modes. J Cons Dent 2012;15: 237-241.
  75. Torres CRG. Influence of concentration and activation
  76. on hydrogen peroxide diffusion through dental tissues in
  77. vitro. Sci World J 2013: 5.
  78. Osternack FH. Impact of refrigeration on the surface
  79. hardness of hybrid and microfilled composite resins. Braz
  80. Dent J 2009;20: 42-47.
  81. DeWald JP, Ferracane JL. A comparison of four modes
  82. of evaluating depth of cure of light-activated composites.
  83. J Dent Res 1987;66: 727-730.
  84. Ferracane JL. Developing a more complete understanding
  85. of stresses produced in dental composites during polymerization.
  86. Dent Mater 2005;21: 36-42.
  87. Bouschlicher MR, Rueggeberg FA, Wilson BM. Correlation of
  88. bottom-to-top surface microhardness and conversion
  89. ratios for a variety of resin composite compositions. Oper
  90. Dent 2004;29: 698-704.
  91. Cenci MS. Relationship between gap size and dentine
  92. secondary caries formation assessed in a microcosm
  93. biofilm model. Caries Res 2009;43: 97-102.
  94. Fróes-Salgado NR. Composite pre-heating: effects on marginal
  95. adaptation, degree of conversion and mechanical
  96. properties. Dent Mater 2010;26: 908-914.
  97. Marovic D. Degree of conversion and microhardness
  98. of dental composite resin materials. J Mol Struct
  99. ;1044: 299-304.
  100. Watts DC, Amer O, Combe EC. Characteristics of
  101. visible-light-activated composite systems. Br Dent J
  102. ;156: 209-15.
  103. Pilo R, Cardash HS. Post-irradiation polymerization of
  104. different anterior and posterior visible light-activated resin
  105. composites. Dent Mater 1992;8: 299-304.
  106. Ayub KV. Effect of preheating on microhardness and viscosity
  107. of 4 resin composites. J Can Dent Assoc 2014;80: e12.
  108. Prasanna N. Degree of conversion and residual stress of
  109. preheated and room-temperature composites. Indian J
  110. Dent Res 2007;18: 173-176.
  111. Feng L, Carvalho R, Suh B. Insufficient cure under the
  112. condition of high irradiance and short irradiation time.
  113. Dent Mater 2009;25: 283-289.
  114. Caldas D. Influence of curing tip distance on resin
  115. composite Knoop hardness number, using three different
  116. light curing units. Oper Dent 2003;28: 315-320.
  117. Soh MS, Yap AU, Siow KS. The effectiveness of cure of LED
  118. and halogen curing lights at varying cavity depths. Oper
  119. Dent 2003;28: 707-15.
  120. Lindberg A, Peutzfeldt A, Van-Dijken JW. Effect of power
  121. density of curing unit, exposure duration, and light guide
  122. distance on composite depth of cure. Clin Oral Investig
  123. ;9: 71-76.
  124. Maghfiroh H, Nugroho R, Probosari N. The effect of
  125. carbonated beverage to the discoloration of polished and
  126. unpolished nanohybrid composite resin. J Dentomaxillofac
  127. Sci 2016;1: 16-19.
  128. Zorzin J. Bulk-fill resin composites: polymerization
  129. properties and extended light curing. Dent Mater
  130. ;31: 293-301.
  131. Cohen ME. Statistical estimation of resin composite
  132. polymerization sufficiency using microhardness. Dent
  133. Mater 2004;20: 158-166.
  134. Jim M, Kim S. effect of pre-heating on some physical
  135. properties of composite resin. J Korean Acad Conserv
  136. Dent 2009;34: 30-37.
  137. Trujillo M, Stansbury JW. Thermal effects on composite
  138. photopolymerization monitored by realtime NIR.
  139. J Dent Res 2003: 82.
  140. Dall'Magro E. Effect of different photoactivation
  141. techniques on the bond strength of a dental composite.
  142. Braz Dent J 2007;21: 220-224.
  143. Galvao MR. Evaluation of degree of conversion and
  144. hardness of dental composites photo-activated with
  145. different light guide tips. Euro J Dent 2013;7: 86-93.

How to Cite

Alomozainy, M. (2018). Influence of storage temperature on vickers microhardness of resin composite. Journal of Dentomaxillofacial Science, 3(2), 70–78.




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