Original Article

Influence of storage temperature on vickers microhardness of resin composite

Mayyadah Alomozainy

Mayyadah Alomozainy
King Saud University. Email: mmozainy@yahoo.com
Online First: August 01, 2018 | Cite this Article
Alomozainy, M. 2018. Influence of storage temperature on vickers microhardness of resin composite. Journal of Dentomaxillofacial Science 3(2): 70-78. DOI:10.15562/jdmfs.v3i2.736

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.


Lazarchik DA. Hardness comparison of bulk-filled/transtooth

and incremental-filled/occlusally irradiated composite

resins. J Prosthet Dent 2007;98: 129-40.

Burgess J, Cakir D. Comparative properties of low-shrinkage

composite resins. Compend Contin Educ Dent

;2: 10-15.

Ilie N, Hickel R. Investigations on a methacrylate-based

flowable composite based on the SDR technology.

Dent Mater 2011;27: 348-355.

Ilie N, Kessler A, Durner J. Influence of various irradiation

processes on the mechanical properties and polymerisation

kinetics of bulk-fill resin based composites. J Dent

;41: 695-702.

Leprince JG. Physico-mechanical characteristics of

commercially available bulk-fill composites. J Dent

;42: 993-1000.

Scougall-Vilchis RJ. Examination of composite resins

with electron microscopy, microhardness tester and

energy dispersive x-ray microanalyzer. Dent Mater J

;28: 102-112.

Faltermeier A. Influence of filler level on the bond strength

of orthodontic adhesives Angle Orthod 2007;77: 494-498.

Czasch P, Ilie N. In vitro comparison of mechanical

properties and degree of cure of bulk-fill composites.

Clin Oral Investig 2013;17: 227-235.

Bucuta S, Ilie N. Light transmittance and micromechanical

properties of bulk-fill vs. conventional resin

based composites. Clin Oral Investig 2014;18: 1991-2000.

Uctasli MB. Effect of preheating on the mechanical properties

of resin composites. Eur J Dent 2008;2: 263-268.

Walter R. Effects of temperature on composite resin

shrinkage. Quintessence Int 2009;40: 843-847.

Daronch MFA, Rueggeberg, De Goes MF. Monomer

conversion of pre-heated composite. J Dent Res

;84: 663-667.

Knight JS, Fraughn R, Norrington D. Effect of

temperature on the flow properties of resin composite.

Gen Dent 2006;54: 14-16.

Lee JH, Um CM, Lee IB. Rheological properties of resin

composites according to variations in monomer and filler

composition. Dent Mater 2006;22: 515-526.

Mjor IA, Gordan VV. Failure, repair, refurbishing and

longevity of restorations. Oper Dent 2002;27: 528-534.

Daronch M. Polymerization kinetics of pre-heated

composite. J Dent Res 2006;85: 38-43.

Bagis YH, Rueggeberg FA. Effect of post-cure

temperature and heat duration on monomer

conversion of photo-activated dental resin composite.

Dent Mater 1997;13: 228-232.

Lucey S. Effect of pre-heating on the viscosity and

microhardness of a resin composite. J Oral Rehabil

;37: 278-282.

Muñoz C. Effect of pre-heating on depth of cure and

surface hardness of light-polymerized resin composites.

Am J Dent 2008;21: 215-222.

Deb S. Pre-warming of dental composites. Dent Mater

;27: e51-59.

Osternack FH. Effects of preheating and precooling on the

hardness and shrinkage of a composite resin cured with

QTH and LED. Oper Dent 2013;38: E1-8.

Daronch M. Clinically relevant issues related to preheating

composites. J Esthet Restor Dent 2006;18: 340-350.

Bausch JR, de Lange C, Davidson CL. The influence of

temperature on some physical properties of dental

composites. J Oral Rehabil 1981;8: 309-317.

Hagge SM. Effect of refrigeration on shear bond strength

of three dentin bonding systems. American J Dent

: 131-133.

Flury S. Depth of cure of resin composites: is the ISO

method suitable for bulk-fill materials?. Dent Mater

;28: 521-528.

Poggio C. Evaluation of Vickers hardness and depth of

cure of six composite resins photo-activated with different

polymerization modes. J Cons Dent 2012;15: 237-241.

Torres CRG. Influence of concentration and activation

on hydrogen peroxide diffusion through dental tissues in

vitro. Sci World J 2013: 5.

Osternack FH. Impact of refrigeration on the surface

hardness of hybrid and microfilled composite resins. Braz

Dent J 2009;20: 42-47.

DeWald JP, Ferracane JL. A comparison of four modes

of evaluating depth of cure of light-activated composites.

J Dent Res 1987;66: 727-730.

Ferracane JL. Developing a more complete understanding

of stresses produced in dental composites during polymerization.

Dent Mater 2005;21: 36-42.

Bouschlicher MR, Rueggeberg FA, Wilson BM. Correlation of

bottom-to-top surface microhardness and conversion

ratios for a variety of resin composite compositions. Oper

Dent 2004;29: 698-704.

Cenci MS. Relationship between gap size and dentine

secondary caries formation assessed in a microcosm

biofilm model. Caries Res 2009;43: 97-102.

Fróes-Salgado NR. Composite pre-heating: effects on marginal

adaptation, degree of conversion and mechanical

properties. Dent Mater 2010;26: 908-914.

Marovic D. Degree of conversion and microhardness

of dental composite resin materials. J Mol Struct

;1044: 299-304.

Watts DC, Amer O, Combe EC. Characteristics of

visible-light-activated composite systems. Br Dent J

;156: 209-15.

Pilo R, Cardash HS. Post-irradiation polymerization of

different anterior and posterior visible light-activated resin

composites. Dent Mater 1992;8: 299-304.

Ayub KV. Effect of preheating on microhardness and viscosity

of 4 resin composites. J Can Dent Assoc 2014;80: e12.

Prasanna N. Degree of conversion and residual stress of

preheated and room-temperature composites. Indian J

Dent Res 2007;18: 173-176.

Feng L, Carvalho R, Suh B. Insufficient cure under the

condition of high irradiance and short irradiation time.

Dent Mater 2009;25: 283-289.

Caldas D. Influence of curing tip distance on resin

composite Knoop hardness number, using three different

light curing units. Oper Dent 2003;28: 315-320.

Soh MS, Yap AU, Siow KS. The effectiveness of cure of LED

and halogen curing lights at varying cavity depths. Oper

Dent 2003;28: 707-15.

Lindberg A, Peutzfeldt A, Van-Dijken JW. Effect of power

density of curing unit, exposure duration, and light guide

distance on composite depth of cure. Clin Oral Investig

;9: 71-76.

Maghfiroh H, Nugroho R, Probosari N. The effect of

carbonated beverage to the discoloration of polished and

unpolished nanohybrid composite resin. J Dentomaxillofac

Sci 2016;1: 16-19.

Zorzin J. Bulk-fill resin composites: polymerization

properties and extended light curing. Dent Mater

;31: 293-301.

Cohen ME. Statistical estimation of resin composite

polymerization sufficiency using microhardness. Dent

Mater 2004;20: 158-166.

Jim M, Kim S. effect of pre-heating on some physical

properties of composite resin. J Korean Acad Conserv

Dent 2009;34: 30-37.

Trujillo M, Stansbury JW. Thermal effects on composite

photopolymerization monitored by realtime NIR.

J Dent Res 2003: 82.

Dall'Magro E. Effect of different photoactivation

techniques on the bond strength of a dental composite.

Braz Dent J 2007;21: 220-224.

Galvao MR. Evaluation of degree of conversion and

hardness of dental composites photo-activated with

different light guide tips. Euro J Dent 2013;7: 86-93.

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