title: Surface wear on cervical restorations and adjacent enamel and root cementum caused by simulated long-term maintenance therapy.
abstract: BACKGROUND
  In an in vitro study, the surface wear on cervical restorations and adjacent enamel and root cementum caused by different tooth-cleaning methods in simulated long-term therapy was investigated.
  
  
  METHODS
  Cervical restorations of amalgam (Oralloy), modified composite resin (Dyract), glass-ionomer cement (ChemFill Superior), and composite (Tetric) were instrumented by POL (polishing), CUR+POL (curette and polishing), US+POL (ultrasonic device with polishing) and the polishing agents Cleanic and Proxyt in a computer-controlled test bench. Treatment time corresponding to a real-time period of 5 or 10 years. Substance loss from instrumented surfaces was measured with a digital gauge. A three-way anova was used in the statistical evaluation.
  
  
  RESULTS
  The results showed that POL led to slight substance loss, which was greater using Cleanic (27 microm) than Proxyt (5 microm). CUR+POL produced a significantly greater substance loss than did US+POL, with 186 microm versus 35 microm on glass-ionomer cement, respectively, and 123 microm versus 18 microm, respectively, on root cementum, followed by composite (111 microm versus 27 microm, respectively), polyacid modified composite resin/compomer (89 microm versus 36 microm), amalgam (75 microm versus 19 microm), and enamel (32 microm versus 23 microm).
  
  
  CONCLUSIONS
  As opposed to the use of US+POL or POL, substance loss on cervical restorations and especially root cementum must be expected to result from tooth-cleaning during long-term maintenance treatment using CUR+POL.
authors.affiliation: Department of Periodontology, School of Dentistry, University of Kiel, Germany. ruehling@konspar.uni-kiel.de
authors.forename: A
authors.initials: A
authors.lastname: Rühling
authors.forename: J
authors.initials: J
authors.lastname: Wulf
authors.forename: C
authors.initials: C
authors.lastname: Schwahn
authors.forename: T
authors.initials: T
authors.lastname: Kocher
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003739:Dental Cementum / Q000473:pathology*; D003743:Dental Enamel / Q000473:pathology*; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing; D003777:Dental Prophylaxis / Q000009:adverse effects; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent; D012534:Dental Scaling; D005899:Glass Ionomer Cements / Q000737:chemistry; D013357:Subgingival Curettage; D013499:Surface Properties; D014072:Tooth Abrasion / Q000209:etiology*; D014092:Tooth Root / Q000473:pathology*; D014464:Ultrasonic Therapy
chemical_list: D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D003723:Dental Amalgam