Abstract
ABSTRACTAimThe aim of this study is to determine the effect of ultraviolet irradiation on the bond strength of composite veneer adhered to the SSCs.Materials and methodsSeventy anterior typhodont teeth (API, New Delhi, India) were randomly divided into two groups (N = 35/group) to be crowned with 70 maxillary left central incisor SSCs, size no. 3 (3MESPE, St. Paul, USA). The crowns were adjusted and cemented with the glass ionomer cement (type I, Ivoclar Vivadent, New York, USA). The labial surfaces of the experimental group were exposed to UV irradiation for 80 minutes using the UV chamber (Easy UV Chamber, India) with 2 UV lamps that produced 30 W of power to induce photoactivation. Standardized composite blocks (Ivoclar Vivadent, Gurgaon, India) of 4 × 4 × 1 mm were fabricated using Teflon molds and light cured for 60 seconds. The samples were fixed in the acrylic resin (NicTone62),with a label bearing the number of each sample. The samples were stored in a dry medium for 24 hours and tested using a universal testing machine.ResultsThe mean shear bond strength in the non-UV group was 26.03 ± 9.42 MPa, while in the UV group, it was 35.10 ± 14.80 MPa. Thus, there was a statistically significant difference in the mean value of the shear bond strength between the non-UV and UV groups. The shear bond strength in the UV group is much higher as compared with the non-UV group.ConclusionBased on this study's results, the following conclusion can be made: ultraviolet irradiation of pediatric stainless steel crowns was found to significantly increase the shear bond strength of composite resin.Clinical significanceUV irradiation could provide suitable adhesion of composite resins to stainless SSCs, leading to in-office veneering of SSCs.How to cite this articleSharma A, Kulkarni S, et al. Effect of Photoactivation by Ultraviolet Light on Bond Strength of Composite Veneer on Stainless Steel Crowns—An In Vitro Study. Int J Clin Pediatr Dent 2019;12(1):50–52.
Highlights
Dental caries is a common dental disease that affects all populations, regardless of age, race, or gender.[1]Children represent a high-risk group to develop caries[2,3]known as early childhood caries (ECC), before they are 6 years old.[4,5]Loss of primary teeth is common sequelae of ECC altering the development of occlusion, phonation, permanent tooth eruption, and esthetic appearance
Restoration of a primary incisor tooth is a challenge to dentists due to severe tooth destruction; operative dentistry could solve these problems, especially for teeth restored with stainless steel crowns (SSCs), veneer crowns, polycarbonate crowns, and strip crowns.[6]
An important addition to the armamentarium of esthetic anterior primary tooth restorations is the veneered stainless steel crown.[10]These crowns are available with a variety of facing materials such as composite resin or thermoplastic resin bonded to the stainless steel crown
Summary
Dental caries is a common dental disease that affects all populations, regardless of age, race, or gender.[1]Children represent a high-risk group to develop caries[2,3]known as early childhood caries (ECC), before they are 6 years old.[4,5]Loss of primary teeth is common sequelae of ECC altering the development of occlusion, phonation, permanent tooth eruption, and esthetic appearance. In-office veneering of crowns has been reported and involves bonding resin composite and compomer directly to the SSCs.[12] The photocatalysis effect by ultraviolet (UV) irradiation of titanium oxide (TiO) has been reported to enhance the attachment of different cell lines, increasing the shear bond strength of the segmented polyurethane.[13–15]UV irradiation could be a suitable application to increase the retention of veneer facing over stainless steel crowns. The purpose of this study was to determine the effects of photoactivation by UV light on bond strength of composite veneer on stainless steel crowns. A thin layer of metal composite bond (SR linking bonding system, Ivoclar Vivadent, Gurgaon, India) was applied to the crown surfaces of all teeth with a small brush and dried for 3 minutes. The shear bond strength in the UV group is much higher as compared with the non-UV group
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