Effect of various grit burs on marginal integrity of resin composite restorations
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1 J Med Dent Sci 2005; 52: 9 15 Original Article Effect of various grit burs on marginal integrity of resin composite restorations Kozo Nishimura 1, Masaomi Ikeda 1, Takako Yoshikawa 1, Masayuki Otsuki 1 and Junji Tagami 1,2 1) Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University 2) Center of Excellence Program for Frontier Research on Molecular, Destruction and Reconstruction of Tooth and Bone, Tokyo Medical and Dental University The purpose of this study was to evaluate the generation of enamel cracks and gaps at the cavosurface margin of resin composite restorations using various burs. Saucer-shaped cavities with a bevel were prepared on mid-coronal buccal or lingual surfaces of extracted human molars using a regular-grit round diamond bur, a fine-grit diamond bur, a superfine-grit diamond bur or a sixbladed tungsten carbide bur with an air turbine handpiece. The enamel margin of the cavity in each group was observed by a light microscope. Cavities were restored with a self-etching adhesive and a light-cured composite resin. After thermocycling, enamel cracks and gaps at the cavosurface margins were observed and scored. Specimens were sectioned longitudinally in two halves, and the resin-cavity interface was observed by means of a light microscope. In cavity preparation, the regulargrid diamond bur and the tungsten carbide bur caused more cracks in the marginal enamel than other groups. From the surface and sectioned surface observation of restored teeth, the superfine-grit diamond bur generated fewer cracks and gaps than the other burs. Key words: resin composite, diamond bur, marginal gap, enamel crack, selfetching primer Corresponding Author: Kozo Nishimura Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, , Yushima, Bunkyo-ku, Tokyo , Japan Tel: Fax: nishimura.ope@tmd.ac.jp Received August 19; Accepted December 3, 2004 Introduction Polymerization contraction stress is still one of the major problems when restoring teeth with resin composite. However, the remarkable improvement of the bond strengths of resin-based adhesives to teeth has contributed to a reduction of the formation of gaps between the resin composite and cavity wall 1. On the other hand, it is important that enamel has a prismatic structure that can easily be pulled apart when stressed 2. When the stress of polymerization contraction exceeds the strength of a tooth, a crack is often initiated, usually in the enamel 3-7. Marginal gaps can lead to secondary caries and pulp irritation due to the accumulation and infiltration of bacteria between the restoration and the tooth substrate 8. In addition, when the enamel cracks have come to extend deeply and widely as the result of repeated occlual loading stress, it is possible that extensive enamel cracks may also produce similar gap formation outcomes as caries and pulp irritation. Therefore, it is important for the longevity of resin composite restorations that the formation of marginal gaps and cracks can be prevented or at least controlled to the greatest degree possible. It has been recommended that a regular-grit diamond bur should be used to obtain a rough surface in cavity preparation in order to increase the surface area and the micro-mechanical bonding retention of adhesives 9. However, cavity preparation with dental burs can easily produce micro-fractures in the enamel. The degree of the generation of enamel damage induced during cavity preparation can be influenced by the diamond grit size and type of bur 10,11. Cavity preparation with minimal mechanical damage at the cavosurface
2 10 K. NISHIMURA et al. J Med Dent Sci margin may be an important factor for preventing enamel cracks at the site of resin composite restoration. The purpose of this study was to evaluate the marginal integrity of cavities restored with resin composite prepared using various burs attached in an air turbine handpiece. Materials and Methods Twenty-four extracted intact human molars were used in this study after the informed consent of donors. There were no cracks observable on the surfaces of the teeth as determined by light microscope observation (Olympus colposcope ocs, Olympus, Japan, x 24). The teeth were divided into four experimental groups, each made up of six teeth. Experimental procedure was shown in Fig 1. Saucershaped cavities approximately 1.5 mm in depth and 2 mm in diameter were prepared on the mid-coronal buccal or lingual surfaces of each tooth and a concave bevel was placed with various burs (round-shape 1.4 mm in diameter) listed in Table 1 using an air turbine handpiece (Super-Torque 640B, Kavo, Germany) at 400,000 rpm under copious water spray coolant as follows: Group 1: Cavity preparation and a bevel using a regular-grit diamond bur. Group 2: Cavity preparation with a regular-grit diamond bur, then finishing and placing a bevel using a fine-grit diamond bur. Group 3: Cavity preparation with a regular-grit diamond bur, then finishing and placing a bevel using a superfine-grit diamond bur. Group 4: Cavity preparation and a bevel using a round-shaped, six-bladed tungsten carbide bur. All cavities in each group were cut with just one bur. The cavity margin of one tooth in each group was observed using a measuring microscope (Measuring microscope MM-60, Nikon, Japan) at x200 magnification. The remaining five cavities were restored with a self-etching primer adhesive system (Clearfil SE Bond, Batch No , Kuraray Medical, Japan) and a light-cured composite (Clearfil AP-X, Batch Fig. 1. Experimental procedure: LM: light microscope Table 1. The cutting equipment used in this study diameter (mm) average grit size(µm) Code, ISO # (manufacturer) regular diamond Experimental (Shofu, Kyoto, Japan) fine diamond U440, ISO # 014 (Shofu, Kyoto, Japan) superfine diamond SF440, ISO # 015(Shofu, Kyoto, Japan) carbide 1.4 #4, ISO # 014 (Shofu, Kyoto, Japan)
3 EFFECT OF VARIOUS GRIT BURS ON MARGINAL INTEGRITY 11 No.00772B, Kuraray Medical, Japan) according to the manufacturer s instructions. The materials were polymerized with a light intensity of 600mW/cm 2 for 40seconds using a light curing unit (Optilux 500, Demetron, USA). After finishing and polishing using a flame-shaped superfine diamond bur (SF215, GC, Japan) and silicone points (M2 and M3, Shofu, Japan) under copious air-water spray, then the specimens were thermocycled for 500 cycles between 5 C and 55 C with a 30-second dwell time. A 1.0 % acid red propyleneglycol solution (Caries Detector, Kuraray Medical, Japan) was applied on the margin of the restorations for 5 seconds, and then rinsed with water to enable the detection of cracks and gaps. The enamel margin was divided into equal eight areas shown Fig.1 and enamel cracks and marginal gaps were observed using the measuring microscope, and then scored the number of areas (0 to 8) in which crack or gap was detected in each tooth specimen. After the evaluation, the specimens were longitudinally sectioned at center of cavity using a diamond saw (Isomet, Buehler, USA). All the sectioned surfaces were polished carefully using silicon carbide papers, and finished with diamond pastes. The dye was applied and washed, then observed to determine enamel crack and gap formation at the occlusal and gingival margins using the measuring microscope. The number of teeth of which one or both specimens had crack or gap was calculated. The number of specimens was five for each group. The Bartlett test was used to examine the homogeneity among groups (p 0.05). The numbers of areas with cracks or gaps in the cavosurfaces were analyzed by the one-way ANOVA. Then, the Tukey s HSD test was performed (p 0.05). Numbers of teeth with cracks and gaps in the cross-sectioned surfaces were analyzed by the two-way ANOVA. The two factors were the type of bur and the area (occlusal and gingival). Then, the Scheffe s test was performed (p 0.05). Results Light microscopic images of the enamel margin in each group are shown in Fig 2. The marginal enamel prepared by the regular-grit diamond bur exhibited as the roughest and small enamel fragments were observed (Fig 2a). The enamel margin finished with the fine-grit diamond bur was similar to that with the regular-grit diamond bur (Fig 2b). Finishing carried out with a superfine-grit diamond bur resulted in smooth marginal enamel, i.e., the enamel with the least number of cracks (Fig 2c). The six-bladed tungsten carbide bur generated a great deal of enamel chipping and cracking (Fig 2d). Table 2 displays average of the number of areas in which crack or gap was detected by cavosurface observation in each group. The crack generation of group 3 (super-fine diamond bur) was statistically lower than that of group 1 (regular diamond bur) and group 4 (tungsten carbide bur) (p 0.05). For the gap formation, group 3 was also lower than other groups. However, there was no statistical difference among four groups (p 0.05). The light microscopic images are shown in Fig 3. In group 1 and 4, small enamel cracks and gap formation were often observed at the resinenamel interface at cavosurface margin (Fig 2a,b). In group 3, enamel cracks were less observed than in other groups. Gap formation was rarely observed in group 3. The number of teeth with cracks or gaps at occlusal and gingival margins in cross sectional surfaces is shown in Table 3. Enamel crack generation was observed at both occlusal and gingival margins in many teeth of each group. In group 3, gap formation was found at occlusal margin in one teeth. Two-way ANOVA revealed that the gap formation was influenced by type of bur (p 0.05). However, it was not influenced by the area (p 0.05). There was no significant interaction between the independent variables group and area (p 0.05). For the gap generation, group 3 was statistically lower than group 4 by the Scheffe s test. The light microscopic images of the cross sectional surfaces are shown in Fig 4. Small enamel cracks were often observed at the occlusal and gingival margin in many teeth of each group. Gap formation was rarely observed in group 3 compared with group 1, 2 and 4. Discussion There are many studies that have evaluated the marginal leakage of restorations 5,7,12-15, however, not only the microleakage due to the formation of gaps but also that due to cracks in the marginal enamel may influence the initiation of further caries 8,14. Marginal microleakage will occur when the bond strength of the adhesive is not sufficient to resist polymerization contraction stress 16,17. Enamel cracking is initiated by the damage caused during preparation with burs and is likely to be furthered by the contraction of the polymerizing resin composite 18. In this study, the effects of the various bur grits on the marginal integrity of the resin restorations
4 12 K. NISHIMURA et al. J Med Dent Sci Fig. 2. Light microscopic images of the marginal enamel (x200). a: Prepared with regular-grit diamond bur (group 1). b: Prepared with fine-grit diamond bur (group 2). c: Prepared with superfine-grit diamond bur (group 3). d: Prepared with a tungsten carbide bur (group 4). An enamel micro-fructure was generated (arrow). Table 2. Average of the number of areas showing cracks and gaps at the cavosurface margins by surface observation (N=5). Group Crack Gap ± ± ± 2.0 * 1.0 ± ± ± 0.4 * ± ± 1.7 *statistically significant difference (p < 0.05) mean ± S. D. were evaluated using a light microscope, because it suggested itself as an observation method with less artifacts likely to distort the outcome. Enamel crack propagation and gap formation at the cavosurface margin varied among the experimental groups. The superfine diamond burs (group 3) produced the smoothest marginal enamel and generated fewer cracks at the margin of the restorations than the others. In terms of gap formation, the superfine bur resulted in fewer gaps than the regular diamond bur or carbide bur. For crack generation and gap formation, there was no statistical difference between group 2 and 3. However, crack generation and gap formation of group 3 were less than that of group 2 LM observation (Fig 2,3,4). Kanemura et al. 11 reported that cavity preparation using a regular grit diamond bur or a carbide bur produced irreversible damage to superficial enamel. Xu et al. 10 reported that the cracks produced by coarse diamond burs were effectively removed by finishing with finer diamond burs. On the other hand, it has been put forward that the rough enamel surface
5 EFFECT OF VARIOUS GRIT BURS ON MARGINAL INTEGRITY 13 Fig. 3. Light microscopic images at the surface of the cavosurface margin of restoration (x200). (E: enamel, R: composite resin) a: Prepared with regular-grit diamond bur (group 1). Arrow showed enamel crack. b: Prepared with carbide bur (group 4). Arrow showed gap formation. c: Prepared with superfine diamond bur (group 3). No gap and crack were observed. Table 3. Number of teeth with cracks and gaps observed at occlusal and gingival margin in crosssection (N=5). Group Crack Gap Occlusal gingival occlusal gingival using a regular diamond or carbide bur was effective when bonding to resin, because a roughened surface increases the area available for adhesion and hence, at least theoretically, is able to improve micro-mechanical retention 9. However, in our study, a great number of smeared enamel fragments were observed on the surface prepared with the regular-grit diamond bur, and a great number of enamel micro-fractures were observed for the carbide bur. Certain gaps were linkable with enamel cracks as reported by Staninec et al. 5 (Fig 4b). Indeed, the presence of microscopic enamel fragments and cracks seem to be closely relatable to
6 14 K. NISHIMURA et al. J Med Dent Sci Fig. 4. Light microscopic images of cavosurface margins of the cross-section (x200). (E: enamel, R: composite resin) a: Prepared by regular-grit diamond bur (group 1). Arrow showed enamel crack. b: Prepared by carbide bur (group 4). Arrow showed gap formation associated with enamel crack. c: Prepared by superfine diamond bur (group 3). No gap and enamel crack were observed. Arrow showed the bonding resin. gap formation. Since the bond strength of the resin adhesive systems used in current practice has been improved dramatically, it might be unnecessary to create a rough cavosurface so as to obtain a greater area for adhesion and micro-mechanical retention. According to the results of this study, finishing with a superfine diamond bur is recommended for clinical cavity preparation to improve the marginal integrity of resin restorations. A concave-bevel (0.5mm width) was placed in this study so as to afford a means of removing unsupported enamel. However, unsupported enamel noted in several specimens nevertheless, especially at the gingival margin, might be due to the non-uniform orientation of the enamel rods 19. The cracks often accompanied unsupported enamel. Øilo & Jørgensen 4 report that a wider bevel at the margin gave an increased number of restorations without fractures in the enamel. Clinically, however, it is sometimes difficult in practice to place a wide bevel at the gingival margin. It is also necessary to consider therefore various methods, including incremental filling technique 20, the polishing time 21, and varying the light intensity during polymerization 14,15 as well as the thickness of bonding layer 22 to improve the marginal integrity of the resin restorations. In this study, the two-step self-etching primer adhesive system was used. The self-etching primer is less aggressive than phosphoric acid when etching enamel. It has been reported that intact ungrounded enamel surface reduces the efficacy of bonding when self-etching primer was used such as Clearfil Liner Bond 2V, Mac Bond II, Clearfil SE Bond and Prompt L-Pop 23,24.
7 EFFECT OF VARIOUS GRIT BURS ON MARGINAL INTEGRITY 15 On the other hand, Shimada et al. 25 report that selfetching primer system (Clearafil SE Bond) exhibited considerable strength in bonding enamel regardless the direction of the enamel prisms and exhibited a great strength in bonding to parallel prismatic enamel than adhesive system with phosphoric acid etching (one-bottle: Single Bond). Furthermore, cracks along the prisms near the bonding interface were produced, resulting in reduced bond strength when phosphoric acid was applied. Phosphoric acid appears to produce more cracks at the cavity margin than self-etching primers. Phosphoric acid etching may be too aggressive on the parallel prismatic enamel surface. Further research comparing these bonding systems will be necessary to make a conclusive determination. Micro enamel cracks were more often observed than gaps at the cavosurface margin, and no gaps were found to have formed between the dentinal cavity walls and the resin restorations except in one specimen in Group 1. This result suggests that the adhesive material used in this study was able to satisfactorily bond to both enamel and dentin, and to thus resist polymerization contraction stress. Conclusion Cavity preparation using a regular-grit diamond bur and a six-bladed tungsten carbide bur caused the greatest degree of enamel crack and gap formation. The superfine-grit diamond bur reduced the enamel crack formation and improved the adaptation of adhesive composites to the cavity. Acknowledgments This research was supported by the grant for the Center of Excellence Program for Frontier Research on Molecular Destruction and Reconstruction of Tooth and Bone in Tokyo Medical and Dental University. References 1. Abdalla AI, Davidson CL. Shear bond strength and microleakage of new dentin bonding systems. Am J Dent 1993;6: Rasmussen ST, Patchin RE, Scott DB, et al. Fracture properties of human enamel and dentine. J Dent Res 1976;55: Jørgensen KD, Asmussen E, Simokobe H. Enamel damages caused by contracting restorative resins. Scand J Dent Res 1975;83: Øilo G, Jørgensen KD. Effect of beveling on the occurrence of fractures in the enamel surrounding composite resin fillings. J Oral Rehab 1977;4: Staninec M, Mochizuki A, Tanizaki K, et al. Interfacial space, marginal leakage and enamel cracks around composite resins. Oper Dent 1986;11: Kanca J III, Suh BI. Pulse activation: Reducing resin-based composite contraction stresses at the enamel cavosurface margins. Am J Dent 1999;12: Yoshikawa T, Morigami M, Tagami J. Environmental SEM observation on resin-tooth interface using slow-start curing method. J Dent Res 2000;79:148 (Abstr 38). 8. Brännström M. Communication between the oral cavity and the dental pulp associated with restorative treatment. Oper Dent 1984;9: Roberson TM, Heymann HO, Swift EJ. Stutdevant s Art & Science of Operative Dentistry. 4th ed. St Louis:Mosby;2002: Xu HHK, Kelly JR, Jahanmir S, et al. Enamel subsurface damage due to tooth preparation with diamonds. J Dent Res 1997;76: Kanemura N, Otsuki M, Tagami J. Marginal enamel fracture due to cavity preparation with cutting instruments. Proceedings of Conference on Critical Reviews of Restorative Quandaries 1998;12:205 (Abstr P3). 12. Prati C, Chersoni S, Cretti L, et al. Marginal morphology of class V composite restorations. Am J Dent 1997;10: Belli S, Inokoshi S, Özer F, et al. The effect of additional enamel etching and a flowable composite to the interfacial integrity of class adhesive composite restorations. Oper Dent 2001;26: Yoshikawa T, Burrow MF, Tagami J. A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations. Dent Mater 2001;17: Yoshikawa T, Burrow MF, Tagami J. The effects of bonding system and light curing method on reducing stress of different C- factor cavities. J Adhes Dent 2001;3: Davidson CL, de Gee AJ, Feilzer A. The competition between the composite-dentin bond strength and the polymerization contraction stress. J Dent Res 1984;63: Carvalho RM, Pereira JC, Yoshiyama M, et al. A review of polymerization contraction: the influence of stress development versus stress relief. Oper Dent 1996;21: Watson TF, Pagliari D, Sidhu SK, et al. Confocal microscopic observation of structural changes in glass ionomer cements and tooth interfaces. Biomater 1998;19: Boyde A. Enamel structure and cavity margins. Oper Dent 1976;1: Rupp NW. Clinical placement and performance of composite resin restorations. J Dent Res 1979;58: Irie M, Suzuki K. 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