title: Comparative evaluation of marginal leakage of provisional crowns cemented with different temporary luting cements: In vitro study.
abstract: As, the longevity of provisional restorations is related to, a perfect adaptation and a strong, long-term union between restoration and teeth structures, therefore, evaluation of marginal leakage of provisional restorative materials luted with cements using the standardized procedures is essential.
  
  
  OBJECTIVE
  To compare the marginal leakage of the provisional crowns fabricated from Autopolymerizing acrylic resin crowns and bisphenol A-glycidyl dimethacrylate (BIS-GMA) resin crowns. To compare the marginal leakage of the provisional crowns fabricated from autopolymerizing acrylic resin crowns and BIS-GMA resin crowns cemented with different temporary luting cements. To compare the marginal leakage of the provisional crowns fabricated from autopolymerizing acrylic resin (SC-10) crowns cemented with different temporary luting cements. To compare the marginal leakage of the provisional crowns fabricated from BIS-GMA resin crowns (Protemp 4) cemented with different temporary luting cements.
  
  
  METHODS
  Freshly extracted 60 maxillary premolars of approximately similar dimensions were mounted in dental plaster. Tooth reduction with shoulder margin was planned to use a customized handpiece-holding jig. Provisional crowns were prepared using the wax pattern fabricated from computer aided designing/computer aided manufacturing milling machine following the tooth preparation. Sixty provisional crowns were made, thirty each of SC-10 and Protemp 4 and were then cemented with three different luting cements. Specimens were thermocycled, submerged in a 2% methylene blue solution, then sectioned and observed under a stereomicroscope for the evaluation of marginal microleakage. A five-level scale was used to score dye penetration in the tooth/cement interface and the results of this study was analyzed using the Chi-square test, Mann-Whitney U-test, Kruskal-Wallis H-test and the results were statistically significant P < 0.05 the power of study - 80%.
  
  
  RESULTS
  Marginal leakage was significant in both provisional crowns cemented with three different luting cements along the axial walls of teeth (P < 0.05) confidence interval - 95%.
  
  
  CONCLUSIONS
  The temporary cements with eugenol showed more microleakage than those without eugenol. SC-10 crowns showed more microleakage compared to Protemp 4 crowns. SC-10 crowns cemented with Kalzinol showed maximum microleakage and Protemp 4 crowns cemented with HY bond showed least microleakage.
authors.affiliation: Department of Prosthodontics and Crown and Bridge, D.A.V. Dental College, Yamuna Nagar, Haryana, India.
authors.forename: Sheen Juneja
authors.initials: SJ
authors.lastname: Arora
authors.affiliation: Department of Prosthodontics and Crown and Bridge, D.A.V. Dental College, Yamuna Nagar, Haryana, India.
authors.forename: Aman
authors.initials: A
authors.lastname: Arora
authors.affiliation: Department of Prosthodontics and Crown and Bridge, D.A.V. Dental College, Yamuna Nagar, Haryana, India.
authors.forename: Viram
authors.initials: V
authors.lastname: Upadhyaya
authors.affiliation: Department of Prosthodontics and Crown and Bridge, D.A.V. Dental College, Yamuna Nagar, Haryana, India.
authors.forename: Shilpi
authors.initials: S
authors.lastname: Jain
keywords: Luting cements; microleakage; provisional crowns