ABSTRACT
This study compared a simple and readily available shade guide color-matching test with the general industry standard test for color discrimination. This study indicates that a simple screening test for color defective vision and color discrimination skills in dentistry can be performed by matching two Vita-Lumin shade guides. Those dental office personnel who score a low number of matches in the Vita test (that is, seven or fewer correct matches) should have additional color discrimination testing and refer shade matching to other personnel with higher scores.
Subject(s)
Color Perception Tests , Dental Porcelain , Prosthesis Coloring , Adult , Color/standards , Dental Staff , Female , Humans , Male , Middle AgedABSTRACT
An in vitro study was conducted (1) to compare fracture strength of amalgam restorations retained with retentive slots of different lengths when stressed with a transverse force, (2) to determine if beveling the slot preparation resulted in an increase in fracture resistance to a transverse force, and (3) to evaluate the incidence of unrestorable tooth fracture as it relates to slot preparation length. Six groups of 10 specimens were prepared with slots of increasing length, with each specimen receiving four slots of equal length. Slot preparations in group 6 were beveled. Results showed that shorter slot preparations provided statistically equal amounts of resistance to a transverse force as did the longer preparations. Beveling the slot preparation did not significantly increase fracture strength. Specimens restored with longer slot preparations failed unrestorably more often than restorations retained with shorter slot preparations.
Subject(s)
Dental Amalgam , Dental Cavity Preparation/methods , Dental Restoration, Permanent , Dental Amalgam/chemistry , Dental Enamel , Dental Stress Analysis , Dentin , Humans , Incidence , Stress, Mechanical , Surface Properties , Tooth Fractures/etiologyABSTRACT
The transverse strength of large amalgam restorations retained by amalgapins of varying diameter and number was evaluated. Restorations with amalgapin retention fractured with greatest frequency parallel to the pulpal floor through the amalgapin at the amalgam-tooth interface. The findings indicate that the geometric configuration and number of amalgapins was of greater importance to the transverse strength of amalgapin-retained restorations than the total cross-sectional area.
Subject(s)
Dental Amalgam , Dental Pins , Dental Restoration, Permanent/methods , Analysis of Variance , Dental Stress Analysis , Humans , Tensile StrengthABSTRACT
Perimolysis is a dental condition linked to chronic regurgitation. When perimolysis is found in the patient who denies vomiting, one must suspect anorexia nervosa, a disorder with a high rate of morbidity and mortality. The dental literature has not provided guidelines for confirming the suspicion of surreptitious vomiting. The purpose of this case report is to describe our approach, using simple blood and urine studies, which establishes whether a patient who has perimolysis but denies vomiting is a surreptitious vomiter.
Subject(s)
Tooth Erosion/etiology , Vomiting/complications , Adult , Anorexia Nervosa/psychology , Female , Humans , Vomiting/psychologyABSTRACT
Three high-copper spherical amalgam alloys and one conventional spherical alloy were compared for microleakage by placing restorations in 60 human premolars. The evaluations were made at 1 week, 1 month, and 3 months after condensation. Almost all the experimental alloys leaked to some degree. When they were evaluated for gross leakage (Class 4) or moderate leakage (Classes 0, 1, 2, and 3), Tytin and Cupralloy leaked significantly less than the control material. This study indicates that the lack of a gamma-2 corrosion does not increase the microleakage of amalgam restorations when these products are used.
