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    FRACTURE DURABILITY OF RESTORED FUNCTIONAL CUSPS ON MAXILLARY NONVITAL PREMOLAR TEETH
    (Mosby-Year Book Inc, 1991) ULUSOY, N; NAYYAR, A; MORRIS, CF; FAIRHURST, CW
    Palatal cusps of nonvital maxillary premolar teeth were restored with a coronal-radicular restoration of posterior composite resin (Occlusin), amalgam (Tytin), or cermet (Chelon-Silver). Mean fracture strength values were: 370 lb for intact premolar teeth, 266 lb for amalgam, 215 lb for posterior composite resin, and 132 lb for cermet. From this in vitro study it can be suggested that for selected endodontically treated maxillary premolar teeth, the dentist can use acid-etch-retained posterior composite resin or pin-retained high copper amalgam material for a definitive coronal-radicular restoration. The use of cermet for this purpose is contraindicated.
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    THERMAL RESPONSE TO MULTIPLE USE OF A TWIST DRILL
    (Mosby-Year Book Inc, 1992) ULUSOY, N; DENLI, N; ATAKUL, F; NAYYAR, A
    The objective of the present investigation was to determine whether injurious thermal changes occur in the pulp chamber if a twist drill is used 10 times, and to find whether there is a correlation between temperature rise and distance between a drilled channel and the pulp chamber. Twenty caries-free, human, premolar teeth were randomly distributed to two dentists. With a new 2 mm twist drill, each dentist prepared 10 pinholes (one hole per tooth). Intrapulpal temperature change during the drilling procedure was recorded. The data were statistically analyzed by the Spearman rank order correlation coefficient. The results showed that twist drills should not be used for more than five pinholes (p < 0.001). The distance between the pin channel and the pulp chamber does not influence heat generation in the pulp chamber.