title: A comparative study of silver amalgam and compomer as retrograde filling materials in periapical surgery.
abstract: OBJECTIVE
  A comparative study is made of the histological effects of silver amalgam versus compomer (Dyract) 90 days after placement as retrograde filling materials in experimental animals.
  
  
  METHODS
  Six Beagle dogs were used, with total pulpectomy and orthograde material filling followed by periapical surgery of the 6 upper and 6 lower incisors (for a total of 72 teeth). Thirty-six teeth corresponded to the right side and were filled with the control material (silver amalgam), while the 36 teeth on the left side were filled with the compomer study material (Dyract). After three months the animals were sacrificed and the histological study was carried out, with evaluation of bone formation, inflammation, and the tissue in contact with the filler material. The results obtained were subjected to a descriptive and comparative statistical analysis (chi-square test).
  
  
  RESULTS
  The samples retrogradely filled with compomer showed significantly greater percentage inflammation (76.19% versus 26.66% in the control group). On the other hand, a large proportion of samples with root cement growth were found in the compomer group. Filler material expulsion was also significantly more common when compomer was used.
  
  
  CONCLUSIONS
  the comparative study of the histological findings showed greater inflammation but also greater root cement growth in the compomer group versus the controls.
authors.affiliation: Oral Surgery and Implantology, School of Dentistry of the University of Barcelona, Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Gargallo Albiol
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Aguirre Urízar
authors.forename: Cosme
authors.initials: C
authors.lastname: Gay Escoda
mesh_terms: D000818:Animals; D020770:Compomers; D003723:Dental Amalgam; D004285:Dogs; D005260:Female; D010486:Periapical Tissue / Q000601:surgery*; D012387:Root Canal Filling Materials; D012834:Silver
chemical_list: D020770:Compomers; C088486:Dyract; D012387:Root Canal Filling Materials; D012834:Silver; D003723:Dental Amalgam