title: Effect of bevelling on marginal microleakage of buccal-surface fissure sealants in permanent teeth.
abstract: OBJECTIVE
  This was to assess the effect of bevelling the margins of fissures on buccal surfaces in permanent molars on marginal microleakage of fissure sealants.
  
  
  METHODS
  The in vitro study was performed on buccal surfaces of 20 extracted permanent third molars, randomly divided into two groups of 10 teeth. Group I: performing enameloplasty (opening the fissures using fissurotomy bur), conditioning with phosphoric acid (37% phosphoric acid for 20 s), placing bonding (enamel bonding agent), and then fissure sealant. Group II: all stages were similar to group I, except for bevelling the margins of buccal fissures (0.5 mm bevel) after enameloplasty. Teeth were then thermocycled, stained with 0.5% basic fuchsin, sectioned and examined for marginal microleakage. The Mann-Whitney test was used for statistical analysis.
  
  
  RESULTS
  No dye penetration was seen in Group II (with bevel), but there was a 60% microleakage in Group I (without bevel) (p=0.005).
  
  
  CONCLUSIONS
  In permanent molar teeth, bevelling the margins of fissures on the buccal surfaces appears to reduce the marginal microleakage of fissure sealants.
authors.affiliation: Dept. of Paediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: F
authors.initials: F
authors.lastname: Mazhari
authors.forename: M
authors.initials: M
authors.lastname: Mehrabkhani
authors.forename: S
authors.initials: S
authors.lastname: Sadeghi
authors.forename: K S
authors.initials: KS
authors.lastname: Malekabadi
mesh_terms: D000134:Acid Etching, Dental; D004396:Coloring Agents; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D003750:Dental Fissures / Q000473:pathology*; D003763:Dental Leakage / Q000145:classification*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008964:Molar, Third / Q000648:ultrastructure; D010756:Phosphoric Acids / Q000737:chemistry; D010895:Pit and Fissure Sealants / Q000737:chemistry*; D012394:Rosaniline Dyes; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D019246:Tooth Preparation / Q000295:instrumentation / Q000379:methods*
chemical_list: D004396:Coloring Agents; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D010895:Pit and Fissure Sealants; D012394:Rosaniline Dyes; C025485:basic fuchsin; C030242:phosphoric acid