title: Microleakage of temporary endodontic restorations in overdenture tooth abutments.
abstract: OBJECTIVE
  The sealing of provisional filling material in overdenture tooth abutments during provisional rehabilitation is of primary importance to the long-term success of roots bearing gold casting copies. The aim of this in vivo study was to evaluate the microleakage of four different provisional filling materials after a period of 1 week.
  
  
  METHODS
  Five patients needing treatment with overdenture prostheses and scheduled for the extraction of at least four teeth were chosen. After performing endodontic treatment on the roots to be extracted, a standardized cavity preparation 3 mm in depth was made using a diamond bur. Each cavity was filled with one of the four provisional materials selected for the evaluation (Cavit-W, IRM Caps, Guttapercha, Fermit-N), and the interim prostheses were delivered to the patients. After 1 week, the roots were extracted and stored for 24 hours in 0.5% basic fuchsin at 37 +/- 1 degrees C for 24 hours. Subsequently, the roots were severed and observed under a stereomicroscope for microleakage evaluation.
  
  
  RESULTS
  The materials showed different degrees of microleakage, but none allowed dye penetration to the bottom of the cavity. IRM Caps showed the lowest mean value of dye penetration (168 microns), while Fermit-N showed the highest (1,475 microns). All materials differed from each other (P < .05).
  
  
  CONCLUSIONS
  Within a period of 1 week, the materials provided acceptable to good sealing properties. All of the materials may be considered suitable for provisional fillings if they do not remain in the oral cavity for more than 1 week.
authors.affiliation: Section of Prosthodontics, Department of Oral Sciences, University of Bologna, Italy.
authors.forename: Roberto
authors.initials: R
authors.lastname: Scotti
authors.forename: Leonardo
authors.initials: L
authors.lastname: Ciocca
authors.forename: Paolo
authors.initials: P
authors.lastname: Baldissara
mesh_terms: D000704:Analysis of Variance; D000044:Dental Abutments; D003738:Dental Cements / Q000009:adverse effects; D003763:Dental Leakage / Q000209:etiology*; D003794:Dental Restoration, Temporary / Q000009:adverse effects*; D003828:Denture, Overlay; D006171:Gutta-Percha / Q000009:adverse effects; D006801:Humans; D008422:Materials Testing; D011109:Polymethacrylic Acids / Q000009:adverse effects; D012387:Root Canal Filling Materials / Q000009:adverse effects*; D012390:Root Canal Therapy / Q000009:adverse effects*; D018709:Statistics, Nonparametric; D013997:Time Factors; D015035:Zinc Oxide-Eugenol Cement / Q000009:adverse effects
chemical_list: D003738:Dental Cements; C072654:Fermit; D011109:Polymethacrylic Acids; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C041941:Cavit W; D006171:Gutta-Percha