Article. Reference. Light-curing time reduction with a new high-power halogen lamp. STAUDT, Christine Bettina, et al.
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1 Article Light-curing time reduction with a new high-power halogen lamp STAUDT, Christine Bettina, et al. Abstract Orthodontic brackets are routinely bonded with light-cured adhesives. Conventional halogen lights used in bonding have the disadvantage of a long curing time, and the available alternatives (laser and plasma lights) are expensive. Our aim was to investigate the minimum time necessary to bond brackets with a new, relatively low-priced, high-power halogen light. Reference STAUDT, Christine Bettina, et al. Light-curing time reduction with a new high-power halogen lamp. American Journal of Orthodontics and Dentofacial Orthopedics, 2005, vol. 128, no. 6, p DOI : /j.ajodo PMID : Available at: Disclaimer: layout of this document may differ from the published version.
2 ORIGINAL ARTICLE Light-curing time reduction with a new high-power halogen lamp Christine Bettina Staudt, a Anestis Mavropoulos, a Serge Bouillaguet, b Stavros Kiliaridis, c and Ivo Krejci d Geneva, Switzerland Introduction: Orthodontic brackets are routinely bonded with light-cured adhesives. Conventional halogen lights used in bonding have the disadvantage of a long curing time, and the available alternatives (laser and plasma lights) are expensive. Our aim was to investigate the minimum time necessary to bond brackets with a new, relatively low-priced, high-power halogen light. Methods: Five groups of 15 deciduous bovine incisors were bonded with stainless steel brackets (Mini Diamond Twin, Ormco, Orange, Calif) by using different lamps and curing times. Three of the groups were bonded by using a high-power halogen light (Swiss Master Light, Electro Medical Systems, Nyon, Switzerland) for 2, 3, and 6 seconds, respectively. The fourth group, bonded with a fast halogen light (Optilux 501, Sybron Dental Specialties, Danbury, Conn) for 40 seconds, served as the positive control group. The fifth group, the comparison group, was bonded with a plasma light (Remecure, Remedent, Deurle, Belgium) for 4 seconds. After storage for 24 hours in the dark at 37 C in water, shear bond strength was measured with a universal testing machine. Results: A curing time of 2 seconds with the high-power halogen light negatively affected the bond strength and the probability of bond survival. The adhesive remnant index scores were not significantly different among the groups. Most failures ( 60%) occurred at the bracket base/adhesive interface. Conclusions: The high-power halogen light seems to be a cost-effective solution to reducing curing time. The recommended curing times to bond stainless steel brackets are 6 seconds and, with caution, even 3 seconds. (Am J Orthod Dentofacial Orthop 2005;128:749-54) From the University of Geneva, Geneva, Switzerland. a Research associate, Department of Orthodontics. b Lecturer, Department of Cariology and Endodontology. c Professor and chair, Department of Orthodontics. d Professor and chair, Department of Cariology and Endodontology. Reprint requests to: Dr Christine Bettina Staudt, Faculté de Médecine, Section de Médecine Dentaire, Division d Orthodontie, 19, rue Barthélemy-Menn, CH-1205 Geneva, Switzerland; , christine.staudt@medecine.unige.ch. Submitted, June 2004; revised and accepted, August /$30.00 Copyright 2005 by the American Association of Orthodontists. doi: /j.ajodo Orthodontic brackets are routinely bonded by using chemical or light-curing adhesive systems. With light-curing materials, the clinician has sufficient time to position the brackets accurately and initiate polymerization when ready. The disadvantage, however, of conventional halogen lights is the long curing time required for each bracket (up to 40 seconds); this wastes valuable clinical time. The curing efficiency of conventional halogen lights is limited, because 98% of their radiation does not contribute to polymerization but is lost as heat. 1 In addition, only part of the halogen light spectrum is useful because the absorption spectrum of camphorquinone is comparatively narrow. 2 To reduce curing time, light sources with higher power densities have been introduced. Argon lasers can achieve bond strengths comparable to the 40 seconds of light-curing with conventional devices in only 10 seconds 3-6 or even 5 seconds. 7 Unfortunately, argon lasers are larger and more expensive than the conventional devices. Xenon plasma lights are less expensive than argon laser lights, but they are 3 times more expensive than halogen lights. 8 Conflicting information exists concerning curing time for xenon plasma lights. Some authors recommend short exposure times of 2 or 3 seconds Others suggest longer exposure times from 6 to 9 seconds 2,12-14 to avoid compromising the mechanical properties or eluting of monomers. 15 Light-emitting diode (LED) units vary widely in their power density. The LEDs evaluated until now for bonding orthodontic brackets have relatively low power densities with irradiation times of 20 to 40 seconds. 8,16-18 These irradiation times are similar to halogen lights. Only 1 study describes a curing time of 10 seconds as sufficient for a specific LED, 17 but this low curing time does not agree with findings that 20 seconds are necessary with this lamp. 18 LED units are relatively inexpensive. No information is available on the new generation of high intensity LEDs. The light-curing devices investigated in other studies have either a long curing time (conventional halogen lights, low power density LEDs) or a comparatively high price (laser, plasma-lights). 749
3 750 Staudt et al American Journal of Orthodontics and Dentofacial Orthopedics December 2005 Table I. Technical characteristics of 3 curing lights Curing device Type Power density Wavelength Tip diameter Swiss Master Light High-power halogen 3000 mw/cm nm 11 mm Optilux 501 Fast halogen 1000 mw/cm nm 8 mm Remecure Plasma 1600 mw/cm nm 5.5 mm The aim of this study was to evaluate a relatively low-cost, high-power halogen light (Swiss Master Light, no. M 00042, Electro Medical Systems SA, Nyon, Switzerland) to estimate the minimum exposure time necessary to achieve bond strength equivalent to the bond strength obtained with a fast halogen light. These results were also compared with a plasma light, which until now has been the most advanced device available for curing time and price. Our null hypothesis was that the shear bond strength obtained with the new high-power halogen light for short irradiation periods would be equivalent to a fast halogen light with a relatively long curing time. MATERIAL AND METHODS Seventy-five deciduous bovine incisors (extracted about age 18 months) were divided into 5 groups of 15 teeth. They were stored in 0.2% thymol for 2 to 3 months. The root of each tooth was cut off, and the crown was polished for 15 seconds with a handpiecebrush by using water and a fluoride-free pumice (Bimsstein Pulver, Prochimie, Avenches, Switzerland). Each tooth was then rinsed thoroughly under tap water for 20 seconds. The teeth were dried with oil-free air for 5 seconds and etched on the buccal side for 30 seconds with 35% phosphoric acid gel (Transbond XT etching gel, no , 3M Unitek, Monrovia, Calif). Each tooth was then rinsed under tap water for 30 seconds and dried again with oil-free air for 5 seconds, followed by application of the primer (Transbond XT Light Cure Adhesive Primer, no , 3M Unitek). Composite (Transbond XT Light Cure Paste, no , 3M Unitek) was applied to the bracket-base (stainless steel brackets: Mini Diamond Twin, for the maxillary right central incisor, no , Ormco, Orange Calif). The bracket was then firmly placed onto the flattest area of the crown with respect to the occlusal/gingival side. Excess composite was carefully removed. Light-curing was performed with the following devices and curing times: Three groups were bonded with a high-power halogen light (Swiss Master Light) in the fast-cure mode. In the first 2 groups, curing times of 2 and 3 seconds were used. The light tip was positioned on the middle of the bracket during each exposure. For the third group, the total curing time was 6 seconds. Because the manufacturer suggested not more than 4 seconds of curing time at once, the time of 6 seconds was divided into 3 seconds on the mesial side and 3 seconds on the distal side of the bracket. The fourth group was bonded with a fast halogen light (Optilux 501 with turbo light guide, serial no , Sybron Dental Specialities, Danbury, Conn) for 20 seconds on the mesial side and 20 seconds on the distal side of the bracket (40 seconds total). This group served as a positive control. The fifth group, the comparison group, was bonded with a xenon plasma arc curing light (Remecure, model CL-15E, serial no. CL15E-A0100, Remedent, Deurle, Belgium) for 2 seconds on the mesial side and 2 seconds on the distal side of the bracket. The total curing time of 4 seconds was according to the light s operation instructions. The technical characteristics of these curing lights are described in Table I. We made sure that the polymerization of the composite was not affected by the position of the lightguiding tip with respect to the bracket. The large tip of the high-power halogen lamp during the 1-shot light exposure covered the bracket completely. Throughout the mesial and distal light exposures, the tip overlapped the middle of the bracket (about 1 mm) to resemble the coverage of the high-power halogen lamp. Therefore, even with the smallest light-guiding tip diameter, the 2 radii of light it produced covered all areas around the bracket. Furthermore, the tip was held at an angle of 90 to the bracket to direct the light at the same angle on each occasion. The shear bond strength was measured with a universal testing machine (Model 1114, serial no. H-1377, Instron Corp, Canton, Mass) (Fig 1). A rectangular rod transmitted the shear force on the occlusal edge of the bracket base until the bracket failed. The following procedure of standardization was developed to ensure that the bracket base would be parallel to the force-exerting rod during bond strength testing. 9,19 Each bonded specimen was embedded in a rectangular acrylic block (Technovit 4071, Lot , Ch.-B , Heraeus Kulzer, Wehrheim/Taunus, Germany). For this purpose, a metallic cubic blade (2
4 American Journal of Orthodontics and Dentofacial Orthopedics Volume 128, Number 6 Staudt et al 751 tooth; 3, all adhesive left on the tooth with a distinct impression of the bracket mesh. Fig 1. Assembly for shear bond strength testing: acrylic block with bonded tooth secured onto lower jaw of testing machine. Force-exerting rod moved along axis parallel to tooth-bracket interface, and its extremity was parallel to occlusal border of bracket base. 2 mm) was fixed into the vertical slot of the bracket to ensure that the tooth-bracket interface was parallel to and projecting slightly above the acrylic surface. 10 When this blade was laid over the mold, the bracket was situated in the middle of the acrylic block, and the edges of the bracket base were parallel to the edges of the block. After storage for 24 hours in the dark at 37 C 2,12,20 in water, 21 the acrylic block with the bonded tooth was secured onto the lower jaw of the testing machine. The shear bond force was applied by the rod. The samples were stressed in an occlusogingival direction with a crosshead speed of 0.5 mm/minute. 22 Due to our special embedding procedure, the direction of the shear force exerted by the rod was parallel to the tooth-bracket interface, and the edge of the rod was parallel to the occlusal edge of the bracket base (Fig 1). The force necessary to debond the brackets was recorded in Newtons and then converted into megapascals (MPa) by dividing the Newtons by the surface area mm 2 of the bracket base. 9,19 The adhesive remnant index (ARI) was used to measure according to the following 4-point scale introduced by Årtun and Bergland 23 : 0, no adhesive left on the tooth; 1, less than half of the adhesive left on the tooth; 2, more than half of the adhesive left on the Statistical analyses For the statistical evaluation, SPSS software (version 11.5, SPSS, Chicago, Ill) was used. The level of significance was set at P.05. Because the distribution of the shear bond strength values was normal, parametric tests were applied. The mean, standard deviation, and 95% confidence interval of the mean were estimated for each group. Comparisons of shear bond strength between lights and curing times were performed by analysis of variance (ANOVA). If a statistically significant difference was found, the post-hoc Tukey test was used to identify which groups were different. Additionally, the groups were classified into Tukey homogeneous subsets. The Weibull survival analysis was also applied to compare the performance of each sample by calculating survival probability at given values of shear stress. 10,13 The nonparametric Kruskal-Wallis test was used to test for significant differences between groups regarding the ARI. RESULTS Descriptive statistics for shear bond strength of the different groups are shown in Table II. ANOVA indicated statistically significant differences between groups (P.001). Shear bond strength was significantly lower for the 2-second high-power halogen light than the 6-second high-power halogen light (P.001), the fast halogen (P.002), and the xenon plasma arc light (P.007) (Table II). The Tukey homogeneous subsets test showed a weaker subset, which included the 2- and 3-second high-power halogen groups (P.06). The stronger subset included the 3- and 6-second high-power halogen light, the fast halogen, and the plasma light (P.565). The bracket survival probability at given levels of shear stress, estimated with the Weibull survival distribution, is shown in Figure 2. The curve of the 2-second high-power halogen lamp differs significantly: the survival probability declines more rapidly at a lower stress level; eg, the vertical dotted lines in Figure 2 correspond to 6-8 MPa that is suggested as the minimum acceptable bracket bond strength for clinical use. 24 In the range of 6-8 MPa, the probability of survival would be approximately 80% for the 2-second high-power halogen light, whereas it would be above 90% for the other groups. A shear stress of approximately 10 MPa would cause 50% bond failures in the case of the 2-second high-power
5 752 Staudt et al American Journal of Orthodontics and Dentofacial Orthopedics December 2005 Table II. Descriptive statistics for shear bond strength (MPa) Curing device* Time (seconds) N Mean SD Lower 95% Upper Minimum Maximum Swiss Master Light b a Optilux a Remecure a Total *Swiss Master Light, high-power halogen light; Optilux 501, fast halogen light; Remecure, xenon plasma arc light. a, b significant difference (P.05) between groups with different symbols. Fig 2. Bracket survival probability plotted against shear stress [MPa] (Weibull survival analysis) for high-power halogen (Swiss Master Light, SML), fast halogen (Optilux 501), and xenon plasma arc light (Remecure) with different curing times (seconds). Vertical dotted lines represent stress range of 6-8 MPa. Horizontal dotted line corresponds to failure probability of 50%. halogen lamp, whereas, to reach the same bond failure rate, a stress of over 15 MPa would be required for the other groups. No statistically significant differences were found between the groups regarding the ARI (P.72) (Table III). More than half of the adhesive was left on the tooth in most cases ( 60%) in every group after debonding. DISCUSSION These results support our hypothesis that the highpower halogen light minimizes curing time dramatically without compromising the bond strength of orthodontic brackets. Exposure to the high-power halogen light for 6 seconds and even for 3 seconds led to shear bond strengths equivalent to those achieved after 40 seconds of exposure to the fast halogen light. An exposure time of only 2 seconds is, however, not recommended because it led to significantly inferior shear bond strength values. An exposure time of 3 seconds should be used with caution, because the 3-second group was not significantly different from the 2-second group. We, therefore, recommend a curing time of 6 seconds for bonding stainless steel brackets. For ceramic brackets, the curing time might be less because the light polymerizes the composite through transillumination of the bracket as well. Curing time is reportedly not influenced by the bandwidth of the emission spectrum of different lights as long as it corresponds approximately to the absorption spectrum of camphorquinone. It is shown that the double bond conversion rate of resin composites is not influenced by the emission spectrum, if the irradiated light energy is the same. 25 Therefore, the parameter that allowed relevant reduction in curing time in our study seems to be the increase in power density (3000 mw/cm 2 for the high-power halogen light compared with 1000 mw/cm 2 for the fast halogen light). However, such a high power density might not be necessary to reduce curing time in the order of magnitude we
6 American Journal of Orthodontics and Dentofacial Orthopedics Volume 128, Number 6 Staudt et al 753 Table III. Frequency distribution of ARI ARI scores Curing device* Time (seconds) Swiss Master Light 2 0 (0.0%) 1 (6.7%) 9 (70.3%) 5 (33.3%) 3 0 (0.0%) 0 (0.0%) 13 (87.1%) 2 (13.3%) 6 0 (0.0%) 1 (6.7%) 10 (60.7%) 4 (26.6%) Optilux (0.0%) 2 (13.3%) 11 (73.3%) 2 (13.3%) Remecure 4 0 (0.0%) 2 (13.3%) 9 (70.3%) 4 (26.6%) *Swiss Master, high-power halogen light; Optilux 501, fast halogen light; Remecure, xenon plasma arc light. 0, no adhesive left on tooth; 1, less than half of adhesive left on tooth; 2, more than half of adhesive left on tooth; 3, all adhesive left on tooth. demonstrated. The xenon plasma arc light had a power density of only 1600 mw/cm 2. Exposure to the xenon plasma arc light for 4 seconds was sufficient to obtain bond strength equivalent to that achieved after 3 or 6 seconds of exposure to the high-power halogen light and after 40 seconds to the fast halogen light. This observation leads to the assumption that, from a certain power density on, further increase in power density ceases to reduce curing time considerably. Such a threshold was previously detected, suggesting that there might be no benefit to polymerization of resin composite when power density is increased above approximately 1000 mw/cm The innovations of the high-power halogen light are its high power density and the unique size of its light-guiding tip (diameter, 11 mm). The light-guiding tip covers the entire bracket, and, in our study, a 1-shot application of 3 seconds was shown to be acceptable. However, the power increase of the high-power halogen light, made possible by an innovative watercooling system, is accompanied by a bulky ( mm) and heavy (7 kg) device. Nevertheless, the high-power halogen lamp is considerably less expensive than the laser or the plasma lamp. Only the LED lamps are less expensive, but no information is available on the new generation of high-intensity LEDs. The bond strength to bovine enamel is weaker than to human enamel. 27 Nevertheless, the use of bovine enamel from deciduous teeth (as in this study) instead of permanent bovine enamel resembles more closely the bond strength values of human enamel. 27 Even when human enamel is used in vitro and in vivo, there is a difference in bond strength: in-vivo values are significantly lower. 28 Thus, a direct extrapolation of in-vitro observations to the clinical situation is difficult, and clinical studies are necessary. Furthermore, clinical studies could determine the minimum bracket bond strength necessary to withstand the forces due to occlusal loading. Recent information on such a threshold is lacking in the literature, and the only indication for the minimum necessary bond strength is given by Reynolds, 24 who suggested 6-8 MPa. If we rely on this finding, the mean shear bond strength of every group in our study would be sufficient (Table II, Fig 2). Even the minimum in every group would be within Reynolds suggested limits, with the exception of the 2-second light-curing with the high-power halogen light. However, the bond strength values measured in this study are common in analogous studies. 2,9,12,20 One must also consider that in-vivo bond strength values are lower. 28 The site of bond failure was unaffected by light source and curing time. Most failures at debonding were located at the bracket-adhesive interface; this agrees with other shear-bond testing studies. 6,8,11,13,19 The relatively weak mechanical retention between the composite and the bracket base reduces the risk of enamel fractures. CONCLUSIONS The results of this study support the use of the high-power halogen light. It is a cost-effective solution to reduce light-curing time. The recommended curing time for bonding stainless steel brackets is 6 seconds or, with caution, even 3 seconds. Our results are based on in-vitro laboratory conditions, and the clinical relevance of our findings should be confirmed in vivo. We thank Dr M. Cattani for his help with the shear bond strength testing. REFERENCES 1. Althoff O, Hartung M. Advances in light curing. Am J Dent 2000;13(spec no):77d-81d. 2. Oesterle LJ, Newman SM, Shellhart WC. Rapid curing of bonding composite with a xenon plasma arc light. Am J Orthod Dentofacial Orthop 2001;119: Blankenau RJ, Kelsey WP, Powell GL, Shearer GO, Barkmeier WW, Cavel XT. Degree for composite resin polymerization with visible light and argon laser. Am J Dent 1991;4: Kurchak M, Desantos B, Powers J, Turner D. Argon laser for light-curing adhesives. J Clin Orthod 1997;31:371-4.
7 754 Staudt et al American Journal of Orthodontics and Dentofacial Orthopedics December Weinberger SJ, Foley TF, McConnell RJ, Wright GZ. Bond strengths of two ceramic brackets using argon laser, light, and chemically cured resin systems. Angle Orthod 1997;67: Talbot TQ, Blankenau RJ, Zobitz ME, Weaver AL, Lohse CM, Rebellato J. Effect of argon laser irradiation on shear bond strength of orthodontic brackets: an in vitro study. Am J Orthod Dentofacial Orthop 2000;118: Lalani N, Foley TF, Voth R, Banting D, Mamandras A. Polymerization with the argon laser: curing time and shear bond strength. Angle Orthod 2000;70: Dunn WJ, Taloumis LJ. Polymerization of orthodontic resin cement with light-emitting diode curing units. Am J Orthod Dentofacial Orthop 2002;122: Sfondrini MF, Cacciafesta V, Pistorio A, Sfondrini G. Effects of conventional and high-intensity light-curing on enamel shear bond strength of composite resin and resin-modified glassionomer. Am J Orthod Dentofacial Orthop 2001;119: Pettemerides AP, Ireland AJ, Sherriff M. An ex vivo investigation into the use of a plasma arc light when using a visible light-cured composite and a resin-modified glass poly(alkenoate) cement in orthodontic bonding. J Orthod 2001;28: Klocke A, Korbmacher HM, Luck LG, Ghosh J, Kahl-Nieke B. Plasma arc curing of ceramic brackets: an evaluation of shear bond strength and debonding characteristics. Am J Orthod Dentofacial Orthop 2003;124: Ishikawa H, Komori A, Kojima I, Ando F. Orthodontic bracket bonding with a plasma-arc light and resin-reinforced glass ionomer cement. Am J Orthod Dentofacial Orthop 2001;120: Klocke A, Korbmacher HM, Huck LG, Kahl-Nieke B. Plasma arc curing lights for orthodontic bonding. Am J Orthod Dentofacial Orthop 2002;122: Dietschi D, Marret N, Krecji I. Comparative efficiency of plasma and halogen light sources on composite micro-hardness in different curing conditions. Dent Mater 2003;19: Munksgaard EC, Peutzfeldt A, Asmussen E. Elution of TEG- DMA and BisGMA from a resin and a resin composite cured with halogen or plasma light. Eur J Oral Sci 2000;108: Bishara SE, Ajlouni R, Oonsombat C. Evaluation of a new curing light on the shear bond strength of orthodontic brackets. Angle Orthod 2003;73: Swanson T, Dunn WJ, Childers DE, Taloumis LJ. Shear bond strength of orthodontic brackets bonded with light-emitting diode curing units at various polymerization times. Am J Orthod Dentofacial Orthop 2004;125: Usumez S, Buyukyilmaz T, Karaman AI. Effect of light-emitting diode on bond strength of orthodontic brackets. Angle Orthod 2004;74: Sfondrini MF, Cacciafesta V, Klersy C. Halogen versus highintensity light-curing of uncoated and pre-coated brackets: a shear bond strength study. J Orthod 2002;29: Oesterle LJ, Newman SM, Shellhart WC. Comparative bond strength of brackets cured using a pulsed xenon curing light with 2 different light-guide sizes. Am J Orthod Dentofacial Orthop 2002;122: Fox NA, McCabe JF, Buckley JG. A critique of bond strength testing in orthodontics. Br J Orthod 1994;21: Eliades T, Brantley WA. The inappropriateness of conventional orthodontic bond strength assessment protocols. Eur J Orthod 2000;22: Årtun J, Bergland S. Clinical trials with crystal growth conditioning as an alternative to acid-etch enamel pretreatment. Am J Orthod 1984;85: Reynolds IR. A review of direct orthodontic bonding. Br J Orthod 1975;2: Yoon TH, Lee YK, Lim BS, Kim CW. Degree of polymerization of resin composites by different light sources. J Oral Rehabil 2002;29: Musanje L, Darvell BW. Polymerization of resin composite restorative materials: exposure reciprocity. Dent Mater 2003;19: Oesterle LJ, Shellhart WC, Bellanger GK. The use of bovine enamel in bonding studies. Am J Orthod Dentofacial Orthop 1998;113: Murray SD, Hobson RS. Comparison of in vivo and in vitro shear bond strength. Am J Orthod Dentofacial Orthop 2003;123: 2-9.
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