Patil S S, Kontham U R, Kamath A, Kontham R
Department of Pedodontics, Dr. D. Y. Patil Dental College and Hospital, Sant Tukaram Nagar, Pimpri, Pune, 411018, Maharashtra, India.
Department of Orthodontics, Nair Hospital Dental College, Dr. A. L. Nair Road, Mumbai, 400008, Maharashtra, India.
Eur Arch Paediatr Dent. 2016 Oct;17(5):377-380. doi: 10.1007/s40368-016-0240-1. Epub 2016 Jul 13.
This was to determine the shear bond strength of composite resin bonded to preformed metal crowns with a new adhesive. Buccal surfaces of the crowns were roughened by two different methods to increase retention.
Typodont mandibular second primary molars (38) were divided into two groups (19 per group). Preformed metal crowns were cemented to the teeth with glass-ionomer cement. To enhance retention, buccal surfaces of the crowns in group I were roughened with cross-cut carbide burs (SS White #56); crowns in group II were sandblasted (aluminium oxide, 50 µm). Scotchbond Universal Adhesive (3 M-ESPE) was used to bond composite resin to the crowns. A universal testing machine tested the maximum shearing force withstood by the veneered composite surfaces.
Sandblasted crowns demonstrated significantly higher resistance (p = 0.001) to shearing force (324.4 N) than did the crowns that were roughened with a bur (234.2 N).
Chairside veneering of composite resin to pretreated crowns could be a feasible, aesthetically pleasing, and an economical option in paediatric dentistry.
本研究旨在确定使用一种新型粘合剂将复合树脂粘结到预成金属冠上的剪切粘结强度。通过两种不同方法对冠的颊面进行粗糙化处理以增加固位力。
选取38颗Typodont下颌第二乳磨牙分为两组（每组19颗）。用玻璃离子水门汀将预成金属冠粘结到牙齿上。为增强固位力，第一组冠的颊面用交叉切割硬质合金车针（SS White #56）进行粗糙化处理；第二组冠进行喷砂处理（50 µm氧化铝）。使用Scotchbond通用粘合剂（3M-ESPE）将复合树脂粘结到冠上。用万能试验机测试贴面复合树脂表面所能承受的最大剪切力。
喷砂处理的冠对剪切力的抵抗力（324.4 N）显著高于用车针粗糙化处理的冠（234.2 N）（p = 0.001）。
在儿童牙科中，在椅旁将复合树脂贴面到预处理过的冠上可能是一种可行、美观且经济的选择。
