title: Microleakage of compomer restorations in primary teeth after preparation with bur or air abrasion.
abstract: This study compared the degree of marginal leakage of a compomer in Class V cavities of human primary molars prepared by a conventional dental bur and air abrasion with or without acid etching. Fifty-six non-carious extracted primary molars were randomly divided into four groups (n=14) to be prepared by four techniques: Group-1: Bur followed by acid etching: Class V cavity preparations were placed on the buccal surfaces of each tooth using a high-speed handpiece. The preparations were 1.5-mm deep, 3-mm long and 2-mm wide, with the occlusal margin in enamel and the cervical margin extending 0.5 mm below the cementoenamel junction. The preparations were acid etched with 37% phosphoric acid starting at the enamel margins for 30 seconds and rinsed with water for 20 seconds. The preparations were then restored with Compoglass F. 2-Group 2: Bur: The preparations and the treatment procedures were the same as in Group 1, with the exception of 37% phosphoric acid application. Group 3: Air abrasion followed by acid etching: Class V cavity preparations were placed on the buccal surfaces of each tooth using a handpiece of an air-abrasive system (PrepStart, Danville Engineering). The system was supplied with dry compressed air at 80 psi. In all tests, the air-abrasion system was operated with an 80 degrees-angle handpiece tip and 50-mm aluminum oxide particles. A tip with a 0.38-mm inner diameter was used at a 2-mm distance. The treatment procedures were the same as in Groups 1 and 2. Group 4: Air abrasion: The preparations and treatment procedures were the same as in Group 3, with the exception of 37% phosphoric acid. After finishing the restorations, the teeth were stored in distilled water at 37 degrees C for 24 hours. The samples were thermocycled for 500 cycles between 5 degrees C and 55 degrees C with a dwell time of 30 seconds. The samples were then immersed in 0.5 percent basic fuchsin dye for 24 hours at 37 degrees C. The surface-adhered dye was then rinsed in tap water and the teeth were embedded in a chemically-activated acrylic resin and bisected longitudinally in a mesiodistal direction with a low speed diamond disk. Each section was examined under a stereomicroscope (Nikon, Tokyo, Japan) at 20x magnification. The data were analyzed statistically by Kruskal-Wallis analysis of variance to determine any statistical significant differences in microleakage scores among the groups at a p-value of 0.05. Also, the enamel versus cementum-dentin microleakage scores of each group were compared using z-test at the 0.05 significance level. There was no statistically significant difference among the groups (p>0.05), but a statistical difference between enamel and cementum-dentin surfaces was evaluated (p<0.05).
authors.affiliation: Department of Pediatric Dentistry, Gazi University, Ankara, Turkey. aysegul@gazi.edu.tr
authors.forename: Olmez
authors.initials: O
authors.lastname: Aysegül
authors.forename: Oztas
authors.initials: O
authors.lastname: Nurhan
authors.forename: Bodur
authors.initials: B
authors.lastname: Haluk
authors.forename: Tüfekçioglu
authors.initials: T
authors.lastname: Dilek
mesh_terms: D000134:Acid Etching, Dental; D020906:Air Abrasion, Dental / Q000379:methods*; D000537:Aluminum Oxide / Q000737:chemistry; D004396:Coloring Agents; D020770:Compomers / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000145:classification / Q000295:instrumentation*; D003743:Dental Enamel / Q000473:pathology; D003754:Dental High-Speed Equipment; D003763:Dental Leakage / Q000145:classification*; D003793:Dental Restoration, Permanent / Q000145:classification; D003804:Dentin / Q000473:pathology; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008963:Molar; D010756:Phosphoric Acids / Q000737:chemistry; D012394:Rosaniline Dyes; D019237:Tooth Cervix / Q000473:pathology; D014094:Tooth, Deciduous / Q000473:pathology*
chemical_list: D004396:Coloring Agents; C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; D012394:Rosaniline Dyes; C025485:basic fuchsin; D000537:Aluminum Oxide