Abstract
Endodontically treated teeth can be restored with prosthetic crowns over cast metal cores or prefabricated posts with composite resin cores. Prosthetic failure is frequently observed possibly due to microleakage. To verify the influence of the core materials in the microleakage of cast crowns, this research studied three experimental conditions: (a) teeth with partial dental remaining core with prefabricated post and partial composite resin cores, (b) teeth with cast metal posts/cores, and (c) teeth with prefabricated posts and composite resin cores. Teeth preparations were standardized, duplicated and the crowns were made in NiCr alloy, which were cemented with zinc phosphate cement. The specimens were submitted to thermocycling and mechanical stresses. They were immerged in a 0,05% aqueous solution of basic fuchsin for 8 hours during 3 days. The crowns were sliced buccal-lingually, and their microleakage was evaluated by glass magnification, according to a score scale. There was no statistical difference between conditions (a) and (c). Microleakage at cervical region of axial wall was observed in both cases. Condition (b) showed higher microleakage, which reached medium third of axial wall.
Highlights
A discerning analysis must be used when restoring endodontically treated teeth
The aim of this research was to verify the marginal leakage of cast crowns cemented over cast metal cores or direct composite resin cores
A confidence interval gives an estimated range of values which is likely to include an unknown population parameter, the estimated range being calculated from a given set of sample data. This statistical tool was applied to the results, and, under 90% confidence level, the of degree microleakage of cast metal core (CMC) is equal to partial resin core (PRC)
Summary
A discerning analysis must be used when restoring endodontically treated teeth. Many teeth need rehabilitation for several reasons like: caries, endodontical access, large restorations and trauma. Endodontically treated teeth can be restored by two techniques: cast dowel cores or prefabricated posts with cores of composite resin. Cast cores are traditionally used and the main advantage is scientific documentation showing evidence of effectiveness, good adaptation and resistance (BERGMAN et al.2, 1989 & MORGANO MILOT7, 1993). There are disadvantages like: extended work time, laboratory costs, chromatic alterations in the root or gingival tissues, difficulty of removal, and possibility of corrosion. Cienc Odontol Bras 2005 out./dez.; 8 (4): 13-17
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