title: Incorporating severity and risk as factors to the Fardal cost-effectiveness model to create a cost-benefit model for periodontal treatment.
abstract: BACKGROUND
  A previously described economic model was based on average values for patients diagnosed with chronic periodontitis (CP). However, tooth loss varies among treated patients and factors for tooth loss include CP severity and risk. The model was refined to incorporate CP severity and risk to determine the cost of treating a specific level of CP severity and risk that is associated with the benefit of tooth preservation.
  
  
  METHODS
  A population that received and another that did not receive periodontal treatment were used to determine treatment costs and tooth loss. The number of teeth preserved was the difference of the number of teeth lost between the two populations. The cost of periodontal treatment was divided by the number of teeth preserved for combinations of CP severity and risk.
  
  
  RESULTS
  The cost of periodontal treatment divided by the number of teeth preserved ranged from (US) $1,405 to $4,895 for high or moderate risk combined with any severity of CP and was more than $8,639 for low risk combined with mild CP. The cost of a three-unit bridge was $3,416, and the cost of a single-tooth replacement was $4,787.
  
  
  CONCLUSIONS
  Periodontal treatment could be justified on the sole basis of tooth preservation when CP risk is moderate or high regardless of disease severity.
authors.affiliation: Private practice, State College, PA.
authors.forename: John A
authors.initials: JA
authors.lastname: Martin
authors.forename: Øystein
authors.initials: Ø
authors.lastname: Fardal
authors.forename: Roy C
authors.initials: RC
authors.lastname: Page
authors.forename: Carl F
authors.initials: CF
authors.lastname: Loeb
authors.forename: Elizabeth Krall
authors.initials: EK
authors.lastname: Kaye
authors.forename: Raul I
authors.initials: RI
authors.lastname: Garcia
authors.forename: Gerard J
authors.initials: GJ
authors.lastname: Linden
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000145:classification / Q000191:economics; D055113:Chronic Periodontitis / Q000145:classification / Q000191:economics* / Q000628:therapy; D003362:Cost-Benefit Analysis; D003442:Crowns / Q000191:economics; D019250:Dental Implants, Single-Tooth / Q000191:economics; D012534:Dental Scaling / Q000191:economics; D003830:Denture, Partial, Fixed / Q000191:economics; D005250:Fees, Dental; D005891:Gingivitis / Q000145:classification / Q000191:economics / Q000628:therapy; D017048:Health Care Costs; D006801:Humans; D008875:Middle Aged; D018803:Models, Economic; D010512:Periodontal Index; D010514:Periodontal Pocket / Q000145:classification / Q000191:economics / Q000601:surgery; D010518:Periodontitis / Q000145:classification / Q000191:economics / Q000628:therapy; D012307:Risk Factors; D016745:Root Planing / Q000191:economics; D012720:Severity of Illness Index; D016388:Tooth Loss / Q000191:economics / Q000517:prevention & control; D055815:Young Adult