Bracket Bond Strength with Transillumination of a Light Activated Orthodontic Adhesive and the Effect of Curing Time and Tooth Thickness on it: An in vitro Study

Kumar, Piush; Nayak, Rabindra S; Tan, Kenneth; Mohan, KA; Pasha, Azam

doi:10.1177/0974909820130306

Cited by 5 publications

(14 citation statements)

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“…Our results are thus in line with the earlier conclusions that transillumination seems to be clinically viable curing method for bonding brackets to incisors but not to premolars [9,10]. The present in vitro study design does not allow analysis of the light scattering effects of the pulpal tissues that has been shown to exceed that of enamel and dentin [15]. Thus, the DC% in vivo would be less than the present results indicate.…”

Section: Discussionsupporting

confidence: 90%

“…Therefore, we used the dentin and enamel slices in this study to exclude the influence of dissolved pulpal tissue to the light transmission through the tooth. The results of Kumar et al [15] indicated that the level of light transmission through 13 mm thick premolar was even lower (1.08 mW/cm 2 ). In spite of the lower level of light transmission through premolars, the bond strengths obtained by the transillumination method were at a clinically acceptable level, not far from those achieved by the conventional labial curing [6,15].…”

Section: Discussionmentioning

confidence: 94%

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Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Mäkinen

Lassila

Varrela

et al. 2019

Biomaterial Investigations in Dentistry

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Bonding properties of light-curing adhesive cured by transillumination through the tooth were compared to those achieved by the conventional technique. The study analyzed the degree of cure (DC%), debonding force (DF) and adhesive remnant index (ARI) when light was transmitted through dental hard tissues. Slices of dentin and enamel of 1 mm in thickness were combined with total thicknesses of 3 or 4 mm to simulate tooth structure without the pulp tissue. DC% with curing time of 20 s, 40 s and 60 s and irradiance power was measured for each group (n ¼ 5). Brackets were bonded using transillumination on extracted incisors (n ¼ 6) and premolars (n ¼ 10), and DF was measured and ARI was scored. No statistical difference was found in light transmission between the simulated samples and incisors (p > .05). Increasing the curing time from 40 s to 60 s enhanced the DC% only in premolars (p < .05). An adequate DF was achieved through transillumination both in incisors and premolars, but in premolars, the DC% remained low compared to conventionally cured brackets. Most of the bracket failures resulted from weak bracket-adhesive bond. ARTICLE HISTORY

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 94%

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Mäkinen

Lassila

Varrela

et al. 2019

Biomaterial Investigations in Dentistry

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“…It can be assumed that light propagation through vital teeth is greater, due to the scattering effect of blood and nervous tissue. Even though light attenuates greatly when transmitting through the entire tooth, there are studies that show clinically satisfactory bond strengths when orthodontic brackets are bonded using the transillumination technique [ 7 – 9 ]. This may be due to light scattering from the edges of the tooth, where the enamel/dentin barrier is minor compared to that through the thickest point of the tooth.…”

Section: Discussionmentioning

confidence: 99%

“…To solve this problem it was suggested by Tavas and Watts [ 6 ] that light curing resin based adhesive could be cured with transillumination through the tooth [ 6 , 7 ]. To achieve a satisfactory degree of monomer conversion and bond strength, it has been shown that the curing time must be prolonged [ 8 , 9 ] because of the dentin and enamel barrier.…”

Section: Introductionmentioning

confidence: 99%

Transmission of Curing Light through Moist, Air-Dried, and EDTA Treated Dentine and Enamel

Uusitalo

Varrela

Lassila³

et al. 2016

BioMed Research International

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Objective. This study measured light transmission through enamel and dentin and the effect of exposed dentinal tubules to light propagation. Methods. Light attenuation through enamel and dentin layers of various thicknesses (1 mm, 2 mm, 3 mm, and 4 mm) was measured using specimens that were (1) moist and (2) air-dried (n = 5). Measurements were repeated after the specimens were treated with EDTA. Specimens were transilluminated with a light curing unit (maximum power output 1869 mW/cm2), and the mean irradiance power of transmitting light was measured. The transmission of light through teeth was studied using 10 extracted intact human incisors and premolars. Results. Transmitted light irradiance through 1 mm thick moist discs was 500 mW/cm2 for enamel and 398 mW/cm2 for dentin (p < 0.05). The increase of the specimen thickness decreased light transmission in all groups (p < 0.005), and moist specimens attenuated light less than air-dried specimens in all thicknesses (p < 0.05). EDTA treatment increased light transmission from 398 mW/cm2 to 439 mW/cm2 (1 mm dentin specimen thickness) (p < 0.05). Light transmission through intact premolar was 6.2 mW/cm2 (average thickness 8.2 mm) and through incisor was 37.6 mW/cm2 (average thickness 5.6 mm). Conclusion. Light transmission through enamel is greater than that through dentin, probably reflecting differences in refractive indices and extinction coefficients. Light transmission through enamel, dentin, and extracted teeth seemed to follow Beer-Lambert's law.

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“…Transillumination is the passage of light through a body area or organ. In relation to orthodontic bonding, this would entail directing light through a tooth to the composite on the bracket base ( 16 , 17 ). Light penetrating the tooth may be more effective than light attempting to traverse the metal bonding pad of the bracket, thereby avoiding competition with the bracket for penetration of the light source ( 1 , 6 ).…”

Section: Introductionmentioning

confidence: 99%

In vitro evaluation of shear bond strength of orthodontic stainless steel brackets using transillumination

Dobrin¹,

Bollu²,

Chaudhry³

et al. 2018

J Clin Exp Dent

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BackgroundThe objective of this study was to compare the effect of transillumination techniques to conventional light curing on shear bond strength (SBS) and adhesive remnant index (ARI) of orthodontic stainless steel brackets.Material and Methods240 extracted human maxillary incisors, canines and premolars were randomly separated into four control and four experimental groups, based on tooth type. Labio-lingual thickness was measured. Control groups were light cured from buccal surface and experimental groups from lingual surface (transillumination) from four directions (mesial-distal, incisal-direct, direct, mesial-distal-incisal). SBS was measured using an Instron machine and ARI evaluated by microscopic inspection.ResultsMean SBS on maxillary central incisors was lower when cured from lingual side in comparison with buccal side for three light cure directions, but direct cure direction showed nearly equal SBS. Statistical significance was observed for mesial-distal cure direction only. In contrast to central incisors, lateral incisors showed a higher mean SBS when treated from lingual side, for two cure directions (mesial-distal and incisal-direct) with statistical significance observed only for mesial-distal light cure direction. Mean SBS was lower when cured from lingual direction in comparison with buccal direction for all cure directions for canines and premolars. For canines statistical significance was observed for all directions, except incisal-direct; whereas for premolars statistical significance was observed for direct and mesial-distal-incisal directions only.ConclusionsTransillumination is an effective and clinically acceptable light curing technique for bonding orthodontic stainless steel brackets to maxillary central and lateral incisors. For the other teeth groups (canines and premolars) tested, the mean SBS values, using transillumination light curing fell below the acceptable clinical SBS values, indicating that transillumination is not beneficial in light curing brackets on these teeth. Key words:Orthodontic stainless steel bracket, transillumination, shear bond strength.

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Bracket Bond Strength with Transillumination of a Light Activated Orthodontic Adhesive and the Effect of Curing Time and Tooth Thickness on it: An in vitro Study

Cited by 5 publications

References 0 publications

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Light-curing of orthodontic bracket adhesive by transillumination through dentine and enamel

Transmission of Curing Light through Moist, Air-Dried, and EDTA Treated Dentine and Enamel

In vitro evaluation of shear bond strength of orthodontic stainless steel brackets using transillumination

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