Journal of Conservative Dentistry
Home About us Editorial Board Instructions Submission Subscribe Advertise Contact e-Alerts Login 
Users Online: 965
Print this page  Email this page Bookmark this page Small font sizeDefault font sizeIncrease font size

Table of Contents   
Year : 2016  |  Volume : 19  |  Issue : 1  |  Page : 37-40
Effect of different polishing systems on the surface roughness of nano-hybrid composites

Department of Conservative Dentistry and Endodontics, K.M. Shah Dental College and Hospital, Sumandeep Vidyapeeth, Piparia, Vadodara, Gujarat, India

Click here for correspondence address and email

Date of Submission11-Aug-2015
Date of Decision17-Oct-2015
Date of Acceptance01-Nov-2015
Date of Web Publication5-Jan-2016


Objective: The study aimed to investigate the influence of different polishing systems on the surface roughness of nano-hybrid composite resins.
Background: Different shapes of polishing systems are available according to the site of work. To minimize variability, a new system with single shape is developed that can be utilized in both anterior as well as posterior teeth.
Materials and Methods: Seventy composite discs were fabricated using Teflon well (10 mm × 3 mm). Two main group of nano-hybrid composite Group I - Filtek Z350 and Group II - Tetric N-Ceram were used (n = 35 for each group). Both groups were further divided into four subgroups. Subgroup a - OneGloss (n = 10), Subgroup b - PoGo (n = 10), Subgroup c - Sof-Lex spiral (n = 10), Subgroup d - Mylar strip (control, n = 5). Samples were polished according to the manufacturer's recommendations. Surface roughness test was performed using contact profilometer. The obtained data were analyzed using the one-way analysis of variance test.
Result: Tetric N-Ceram produced smoother surfaces than Filtek Z350 (P < 0.05). Mylar strip and "PoGo" created equally smooth surfaces, while significantly rougher surfaces were obtained after applications of "Sof-Lex spiral" and "OneGloss" (P < 0.05).
Conclusion: Polishing ability of Tetric N-Ceram is better than Filtek Z350 XT. "PoGo" seems to be a better polishing system than "OneGloss" and "Sof-Lex Spiral."

Keywords: Composite resin; dental polishing; esthetics

How to cite this article:
Patel B, Chhabra N, Jain D. Effect of different polishing systems on the surface roughness of nano-hybrid composites. J Conserv Dent 2016;19:37-40

How to cite this URL:
Patel B, Chhabra N, Jain D. Effect of different polishing systems on the surface roughness of nano-hybrid composites. J Conserv Dent [serial online] 2016 [cited 2023 Mar 20];19:37-40. Available from:

   Introduction Top

Enormous esthetic demands have led the dentists to adopt the resin composite restorations in routine dental practice. [1] Surface roughness of the dental restorations remains a striking problem associated with the use of direct composite resins [2] which increases plaque retention resulting in gingival inflammation, superficial discoloration, and secondary caries. On the contrary, smooth, highly polished restorations are shown to be less susceptible to plaque accumulation and extrinsic discoloration; bear improved mechanical properties. [3]

The performance of a composite restorative is also dependent upon the type and size of the filler. Usually, a composite with smaller size filler particles provides better surface finish than one containing larger filler particles. Refinements in the particle size through enhanced milling and grinding techniques have resulted in composites with particles that are sub-micron (nano-hybrid), typically averaging about 0.4-1 μm and generally considered to be the universal composites as they can be used for most anterior and posterior applications owing to excellent strength and polishing ability. [4]

A variety of finishing and polishing procedures are routinely employed such as carbide burs, diamond points, abrasive disks, abrasive finishing strips, and polishing pastes. Recently, one-step polishing systems such as PoGo ® (Dentsply/Caulk, Milford, DE, USA) and OneGloss ® (Shofu INC, Japan) are introduced by which contouring, finishing, and polishing can be completed using a single instrument in minimal time. [5] PoGo ® is a one-step diamond micropolisher and OneGloss ® is an aluminum oxide finisher and polisher, which provide ideal finish for all types of composite and cemented restorations. Recently, Sof-Lex™ spiral wheels (3M ESPE, St. Paul, USA) have been developed which is the only system having a universal design that facilitates finishing and polishing in all the regions of the tooth. [6] It consists of two-step finishing and polishing elastomeric wheels impregnated with aluminum oxide powder particles.

Assessment of Surface roughness using profilometer has been the criterion to measure and predict the deterioration of restorations of different material types. [7] The most commonly used parameter to describe surface roughness is Ra, which is the arithmetic mean of vertical departure of a profile from the mean. [8],[9]

Although the surface finish of composites has been widely investigated both in laboratory as well as clinical studies, [10] information about the quality of surface finish from different polishing systems on the surface roughness of nano-hybrid composite resin is scarce and limited. Therefore, this in vitro study was aimed to investigate the influence of different polishing systems on the surface roughness of two different nano-hybrid composite resins. The null hypothesis for the present study stated that there shall not be any difference in the polishing ability of either the tested polishing systems or the experimental nano-hybrid composites.

   Materials and Methods Top

Seventy identical Teflon wells were fabricated (10 mm diameter and 3 mm height) and randomly assigned to two groups (n = 35 each) based on the type of restorative material; Group I - Tetric N-Ceram™ (Ivoclar Vivadent, Mumbai, India) and Group II - Filtek Z350™ (3M ESPE, St. Paul, USA). Each group was further subdivided into four subgroups based on the polishing regimen used as follows: Subgroup Ia and IIa - OneGloss ® (Shofu INC, Japan) (n = 10), Subgroup Ib and IIb - Pogo ® (Dentsply/Caulk, Milford, DE, USA) (n = 10), Subgroup Ic and IIc - Sof-Lex™ spiral (3M ESPE, St. Paul, USA) (n = 10) and Subgroup Id and IId - Mylar strip (control) (n = 5). Restorative materials were polymerized according to manufacturer's instructions using an LED curing light (LEDition, Ivoclar Vivadent, Liechtenstein, USA) placed perpendicular to the specimen's surface at a distance of <1.0 mm. Specimens were examined for obvious voids, labeled on the bottom, and randomly separated as per subgroup treatment protocol. Except for the Mylar strip groups, specimens in the other three subgroups were wet-grounded for 30 s with 1200-grit silicon carbide paper on a metallurgical finishing wheel to provide a baseline before applying the polishing systems. The polishing procedure was varied according to the polishing system used as follows: Subgroup Ia, IIa - OneGloss (Shofu) polishing disk was used for 30 s at 15,000 rpm with a low-speed handpiece for each sample. Subgroup Ib, IIb - The flat, broad surface of PoGo diamond micro-polisher disk was first applied using light hand pressure, followed by a gentle buffing motion for 30 s at 15,000-25,000 rpm with a low-speed handpiece. Subgroup Ic, IIc - First the finishing wheel was used followed by the polishing wheel for 30 s each with moderate pressure applied with a handpiece speed of 10,000-20,000 rpm. Subgroup Id, IId (control) - Restorative materials were polymerized with the Mylar strip on top of the specimens and no finishing or polishing system were used. To reduce the variability, the same operator performed all the procedures. All polishing materials were discarded after every use. The prepared samples were stored at 37°C for 24 h in 100% humidity. Surface roughness test was performed with a contact profilometer (Perthometer, Mitutoyo, S j-201p) having a diamond tip stylus with a tip diameter of 2 μm. Three successive measurements in different directions were recorded for all specimens in each group, and the average surface roughness (Ra) value was obtained. The cut-off value for surface roughness was 0.25 mm, and the sampling length for each measurement was 1.25 mm.

   Results Top

Independent Sample t-test and post-hoc tests were used to compare the means between two groups and one-way analysis of variance was used to evaluate the intra-group comparison (confidence interval = 95%). Tetric N-Ceram (Group I) provided smoother surface finish as compared to Filtek Z350 (Group II) (P = 0.04; confidence interval = 95%; degree of freedom = 68). PoGo Group (Ib, IIb) created similar smooth surfaces as with Mylar strip Group (Id, IId), while significantly rougher surfaces were obtained after applications of Sof-Lex Spiral Group (Ic, IIc) and OneGloss Group (Ia, IIa) (P < 0.05) in both the main groups. None of the polishing systems achieved equally smooth surfaces as that of Mylar strip group (P < 0.0001). However, PoGo (Ib, IIb) created maximum smoothness among all the polishing systems tested [Figure 1].
Figure 1: Graphical representation of the mean score of surface roughness of all the polishing systems

Click here to view

   Discussion Top

Finishing and polishing of resin composite restorations are critical steps to enhance the esthetics and longevity of restored teeth. [10] Poorly polished restorations are susceptible to surface discoloration, plaque buildup, gingival irritation, and recurrent caries. [11] The surface quality of resin composite restorations is associated with the polishing quality along with its inborn physical properties like volume, hardness, quantity of filler particles and organization of the resin matrix. [12]

The present study employed wet 1200-grit silicone carbide paper (average abrasive particle size: 30 μm) for finishing the resin composite surface to simulate the clinical scenario as similar particle size abrasives are incorporated to most dental finishing instruments. [13]

Mylar strip produced perfectly smooth restoration surface, although it is rich in the resin organic binder. Finishing and polishing in such a case results in harder, more wear resistant and esthetically pleasing surface which is attributed to the removal of the superficial resin layer. [14]

The efficiency of abrasive systems is related to the flexibility of the backing material in which the abrasive is embedded, the hardness of the abrasive, geometry of the instrument and its manner of use. The abrasive particles must be relatively harder than the filler of composite for a finishing system to be effective. If not, the polishing agent will only remove the soft resin matrix and leave the filler particles protruding from the surface. [15] In the present study, PoGo polisher produced smoother surfaces than OneGloss and Sof-Lex spiral wheel similar to previous studies. [16] PoGo is a flexible micro-polisher disk with fine diamond particles whereas, Sof-Lex spiral contains elastomeric impregnated with aluminum oxide particles, and OneGloss is polyvinylsiloxane impregnated with aluminum oxide. The excellent polishing ability of PoGo may be attributed to lower surface roughness and harder diamond (7000 KHN) particles as compared to aluminum oxide (2100 KHN). [17] Furthermore, visual inspection of the polished specimens with PoGo revealed an enamel-like glossy surface while OneGloss and Sof-Lex-Spiral Wheel system created a duller appearance.

Comparatively better surface finish in the case of Tetric N-Ceram (Group I) could be linked to the relatively less hard filler constituents as Tetric N-Ceram has barium glass (1.25 moh's), ytterbium fluoride (206 KHN) filler whereas Filtek Z350 consists of zirconia (1600 KHN) and silica (820 KHN) as fillers.

The Sof-Lex spiral wheel is a two-step technique whereas OneGloss being a single step polishing system. In the present study, Sof-Lex spiral wheel resulted in better surface finish than the OneGloss in agreement with the earlier studies where multistep polishing systems resulted in better surface finish than the single step. [18]

In the composition of resin composites, an interdependent relationship exists between the amount of inorganic filler particles and that of the organic matrix. In the present study, Group I showed better results than Group II. It may be attributed to higher filler loading of Tetric ® N-Ceram (82.5% W−1 ) as compared to Filtek Z350 XT (78.5% W−1 ) and so the resin matrix content of Filtek Z350 (20-25% W) is higher than the Tetric ® N-Ceram (10-15% W), which makes the polishing of Filtek Z350 more difficult. [19]

This study utilized two-dimensional (2D) profilometry for quantitative assessment of the surface characteristics of the polished composites as used in previous research; [20] however, three-dimensional profilometry could have provided a complete description of the surface topography. In addition, the atomic force microscopy equipped with a 0.01 μm tip would have offered a much better spatial resolution of the traced surface.

According to Chung, [21] the Ra value determined by 2D profilometry was <1 μm when the composite surfaces were visibly smooth. On the other hand, if 2D surface roughness (Ra) were above 0.2 μm, it exceeded the clinically acceptable threshold for composite resin restorations. According to Bollen et al., [22] higher Ra values were accompanied by increased plaque accumulation and a higher risk for dental caries and periodontal diseases. However, other studies reported that there is no difference in plaque accumulation throughout the roughness (Ra) range of 0.7-1.4 μm. [23] In the present study, all the polishing systems were in the range of 0.3-1.8 μm.

   Conclusion Top

The null hypothesis was rejected in the present research. Therefore within the limitation of the present study it can be concluded that polishing action of PoGo is better then the OneGloss and Sof-Lex Spiral Wheel. In addition, Tetric N-Ceram seems to be better in context to polishing ability, than Filtek Z350. However, the in vitro nature of this study makes its clinical implication arduous.

Financial support and sponsorship


Conflicts of interest

There are no conflicts of interest.

   References Top

Brackett WW, Gilpatrick RO, Gunnin TD. Effect of finishing method on the microleakage of Class V resin composite restorations. Am J Dent 1997;10:189-91.  Back to cited text no. 1
Senawongse P, Pongprueksa P. Surface roughness of nanofill and nanohybrid resin composites after polishing and brushing. J Esthet Restor Dent 2007;19:265-73.  Back to cited text no. 2
Gordan VV, Patel SB, Barrett AA, Shen C. Effect of surface finishing and storage media on bi-axial flexure strength and microhardness of resin-based composite. Oper Dent 2003;28:560-7.  Back to cited text no. 3
Endo T, Finger WJ, Kanehira M, Utterodt A, Komatsu M. Surface texture and roughness of polished nanofill and nanohybrid resin composites. Dent Mater J 2010;29:213-23.  Back to cited text no. 4
Ferracane JL. Resin composite - State of the art. Dent Mater 2011;27:29-38.  Back to cited text no. 5
Attar N. The effect of finishing and polishing procedures on the surface roughness of composite resin materials. J Contemp Dent Pract 2007;8:27-35.  Back to cited text no. 6
Lutz F, Setcos JC, Phillips RW. New finishing instruments for composite resins. J Am Dent Assoc 1983;107:575-80.  Back to cited text no. 7
Smales RJ, Webster DA, Leppard PI. Predictions of restoration deterioration. J Dent 1992;20:215-20.  Back to cited text no. 8
Setcos JC, Tarim B, Suzuki S. Surface finish produced on resin composites by new polishing systems. Quintessence Int 1999;30:169-73.  Back to cited text no. 9
Quirynen M, Marechal M, Busscher HJ, Weerkamp AH, Darius PL, van Steenberghe D. The influence of surface free energy and surface roughness on early plaque formation. An in vivo study in man. J Clin Periodontol 1990;17:138-44.  Back to cited text no. 10
Strassler HE, Bauman G Current concepts in polishing composite resins. Pract Periodontics Aesthet Dent 1993;5 (3 Suppl 1):12-7.  Back to cited text no. 11
Van Noort R, Davis LG. The surface finish of composite resin restorative materials. Br Dent J 1984;157:360-4.  Back to cited text no. 12
Takanashi E, Kishikawa R, Ikeda M, Inai N, Otsuki M, Foxton RM, et al. Influence of abrasive particle size on surface properties of flowable composites. Dent Mater J 2008;27:780-6.  Back to cited text no. 13
Stoddard JW, Johnson GH. An evaluation of polishing agents for composite resins. J Prosthet Dent 1991;65:491-5.  Back to cited text no. 14
Chandler HH, Bowen RL, Paffenbarger GC. Method for finishing composite restorative materials. J Am Dent Assoc 1971;83:344-8.  Back to cited text no. 15
Ergücü Z, Türkün LS. Surface roughness of novel resin composites polished with one-step systems. Oper Dent 2007;32:185-92.  Back to cited text no. 16
Ozel E, Korkmaz Y, Attar N, Karabulut E. Effect of one-step polishing systems on surface roughness of different flowable restorative materials. Dent Mater J 2008;27:755-64.  Back to cited text no. 17
Antonson SA, Yazici AR, Kilinc E, Antonson DE, Hardigan PC. Comparison of different finishing/polishing systems on surface roughness and gloss of resin composites. J Dent 2011;39 (Suppl 1):e9-17.  Back to cited text no. 18
De Carvalho RA, de Lima CS, da Silva SM, Resende MM. Evaluation of surface roughness of a nanofill resin composite after simulated brushing and immersion in mouth rinses, alcohol and water. Mat Res 2010;13:77-80.  Back to cited text no. 19
Abu-Bakr N, Han L, Okamoto A, Iwaku M. Evaluation of the surface roughness of compomer by laser scanning microscopy. Dent Mater J 2001;20:172-80.  Back to cited text no. 20
Chung KH. Effects of finishing and polishing procedures on the surface texture of resin composites. Dent Mater 1994;10:325-30.  Back to cited text no. 21
Bollen CM, Lambrechts P, Quirynen M. Comparison of surface roughness of oral hard materials to the threshold surface roughness for bacterial plaque retention: A review of the literature. Dent Mater 1997;13:258-69.  Back to cited text no. 22
Weitman RT, Eames WB. Plaque accumulation on composite surfaces after various finishing procedures. Oral Health 1975;65:29-33.  Back to cited text no. 23

Correspondence Address:
Dr. Naveen Chhabra
Department of Conservative Dentistry and Endodontics, K.M. Shah Dental College and Hospital, Sumandeep Vidyapeeth, Piparia, Vadodara, Gujarat
Login to access the Email id

Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-0707.173192

Rights and Permissions


  [Figure 1]

This article has been cited by
1 Effect of finishing protocols and staining solutions on color stability of dental resin composites
Chamunorwa Marufu, Bernina K. Kisumbi, Olivia A. Osiro, Fred O. Otieno
Clinical and Experimental Dental Research. 2022;
[Pubmed] | [DOI]
2 Surface roughness and oxygen inhibited layer control in bulk-fill and conventional nanohybrid resin composites with and without polishing: in vitro study
Andrea Gaviria-Martinez, Leonor Castro-Ramirez, Marysela Ladera-Castañeda, Luis Cervantes-Ganoza, Hernán Cachay-Criado, María Alvino-Vales, Goretty Garcia-Luna, Carlos López-Gurreonero, Alberto Cornejo-Pinto, César F. Cayo-Rojas
BMC Oral Health. 2022; 22(1)
[Pubmed] | [DOI]
3 The Effect of Various Polishing Systems on the Surface Roughness of Two Resin Composites—An In Vitro Study
Marta Ewa Szczepaniak, Michal Krasowski, Elzbieta Boltacz-Rzepkowska
Coatings. 2022; 12(7): 916
[Pubmed] | [DOI]
4 A three-year randomized clinical trial evaluating direct posterior composite restorations placed with three self-etch adhesives
Joseph Sabbagh, Layal El Masri, Jean Claude Fahd, Paul Nahas
Biomaterial Investigations in Dentistry. 2021; 8(1): 92
[Pubmed] | [DOI]
5 The effect of glycerin on the surface hardness and roughness of nanofill composite
Diana Zakiyah, Ruslan Effendy, Edhie Arif Prasetyo
Conservative Dentistry Journal. 2019; 8(2): 104
[Pubmed] | [DOI]
6 In Vitro Analysis of Different Polishing Systems on the Color Stability and Surface Roughness of Nanocomposite Resins
Suneel V Vadavadagi, Sultan A Almalki, Kiran Murthy Dhananjaya, Tanya Verma
The Journal of Contemporary Dental Practice. 2019; 20(11): 1335
[Pubmed] | [DOI]
7 Impact of Polishing Systems on the Surface Roughness and Microhardness of Nanocomposites
Yasser Alfawaz
The Journal of Contemporary Dental Practice. 2017; 18(8): 647
[Pubmed] | [DOI]


    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Email Alert *
    Add to My List *
* Registration required (free)  

    Materials and Me...
    Article Figures

 Article Access Statistics
    PDF Downloaded407    
    Comments [Add]    
    Cited by others 7    

Recommend this journal