title: The Clinical Performance of Monolithic Lithium Disilicate Posterior Restorations After 5, 10, and 15 Years: A Retrospective Case Series.
abstract: OBJECTIVE
  Lithium disilicate (LDS) glass-ceramic restorations are routinely used, but results over a period longer than 10 years are rare. The objective of this study was to obtain long-term clinical data on monolithic LDS posterior crowns provided by a single restorative dentist.
  
  
  METHODS
  Eligible patients who received a circumferential LDS crown in the posterior region between 1997 and 2010 were invited to participate in a clinical examination in 2015. This consisted of intraoral inspection and radiographs, performed by one observer and according to standardized criteria. Probability of survival was estimated using Kaplan-Meier survival analysis.
  
  
  RESULTS
  A total of 13 patients (n = 87 restorations) fulfilled the inclusion criteria. Of these, 12 patients were available for clinical evaluation (n = 74 restorations). After 5, 10, and 15 years, the cumulative chance of survival of the restoration was 92%, 85.5%, and 81.9%, respectively, with a median observation period of 12.8 years. Of the 74 restorations, 13 failed: 4 because of secondary caries, 2 because of debonding, and 7 because of fracture of the restoration.
  
  
  CONCLUSIONS
  Lithium disilicate can be regarded as a strong and fracture-load-resistant restorative material providing reliable long-term clinical performance.
authors.forename: Carline Rg
authors.initials: CR
authors.lastname: van den Breemer
authors.forename: Carolien
authors.initials: C
authors.lastname: Vinkenborg
authors.forename: Hans
authors.initials: H
authors.lastname: van Pelt
authors.forename: Daniel
authors.initials: D
authors.lastname: Edelhoff
authors.forename: Marco S
authors.initials: MS
authors.lastname: Cune
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent; D006801:Humans; D012189:Retrospective Studies; D013997:Time Factors
chemical_list: D000538:Aluminum Silicates; C508050:IPS e.max Press; C075815:IPS-Empress ceramic; C493120:lithia disilicate; D003776:Dental Porcelain