title: Overhanging amalgam restorations by undergraduate students.
abstract: OBJECTIVE
  To determine the frequency of overhanging margins in amalgam restorations done by undergraduate students at Fatima Jinnah Dental College Hospital, Karachi.
  
  
  METHODS
  Observational study.
  
  
  METHODS
  Department of Operative Dentistry, Fatima Jinnah Dental Hospital, Karachi, from January to June 2009.
  
  
  METHODS
  Patients aged 20 - 45 years attending the Department of Operative Dentistry requiring class-II restorations were included in the study. Whereas, third molars, overlapped proximal surfaces, teeth adjacent to edentulous spaces and pregnant females were excluded. One hundred and fifty patients were selected randomly aged between 20 - 45 years requiring class-II restorations. Posterior Bitewing radiographs were taken and 1600 surfaces were examined. Restorations were done by undergraduate students at Fatima Jinnah Dental College Hospital, Karachi. Chi-square test was utilized to analyze the relationship between location and surface of overhang.
  
  
  RESULTS
  Overhanging amalgam restorations were common in the restorations done by undergraduate students (58%). The occurrence of overhangs was more frequent on the distal surfaces (56%) Although the association of amalgam overhangs with the surfaces of the teeth was significant (p < 0.0001), overhangs were not significantly associated with the location of the teeth (p < 0.063).
  
  
  CONCLUSIONS
  Overhanging restorations were present in approximately 58% of all proximal amalgam restorations done by undergraduate students.
authors: Department of Operative Dentistry, Dow Dental College, Karachi.
authors: Fauzia
authors: F
authors: Quadir
authors: Department of Operative Dentistry, Dr. Ishrat ul Ebad Khan Institute of Oral Health Sciences, Karachi.
authors: S Yawar
authors: SY
authors: Ali Abidi
authors: Department of Operative Dentistry, Dr. Ishrat ul Ebad Khan Institute of Oral Health Sciences, Karachi.
authors: Shahbaz
authors: S
authors: Ahmed
mesh_terms: D000293:Adolescent; D000328:Adult; D002983:Clinical Competence; D003723:Dental Amalgam; D003793:Dental Restoration, Permanent; D005260:Female; D006801:Humans; D008297:Male; D016300:Radiography, Bitewing; D013335:Students, Dental; D013499:Surface Properties; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D003723:Dental Amalgam