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STATEMENT OF PROBLEM: Stereolithography (SLA) procedures can be chosen for manufacturing definitive crowns; however, how the print orientation impacts the trueness and precision of the intaglio surface of the printed definitive restorations is unclear. PURPOSE: The purpose of this in vitro investigation was to calculate the manufacturing accuracy of the intaglio surface of SLA definitive resin-ceramic crowns fabricated at varying print orientations (0, 45, 75, or 90 degrees). MATERIAL AND METHODS: The standard tessellation language (STL) file of an anatomic contour molar crown was obtained and used to fabricate all the crowns by using a definitive resin-ceramic material (Permanent Crown) and an SLA printer (Form 3B+). Four groups were developed depending on the print orientation selected to manufacture the crowns: 0-, 45-, 70-, and 90-degree print orientation (n=30). Each crown specimen was digitized without the use of scanning powder by using a desktop scanner (T710). The crown design file was determined as the reference (control) group and used to calculate the fabricating trueness and precision of the intaglio surface of the specimens using the root mean square (RMS) error computation. Trueness data were examined by using 1-way ANOVA and post hoc pairwise multiple comparison Tukey tests, while precision data were analyzed using the Levene test (α=.05). RESULTS: The mean ±standard deviation RMS error discrepancies ranged from 37 ±3 µm to 113 ±11 µm. One-way ANOVA exposed significant trueness (P<.001) differences among the groups considered in this study. Furthermore, all the print orientation groups tested were different from each other (P<.001). The 0-degree group presented the best trueness value (37 µm), while the 90-degree group obtained the worst trueness value (113 µm). The Levene test exposed significant precision differences among the groups assessed (P<.001). The 0-degree group had a significantly lower standard deviation (higher precision) (3 µm) than the other groups, with no difference among the other groups tested (P>.05). CONCLUSIONS: The fabricating trueness and precision of the intaglio surface of the SLA resin-ceramic crowns was impacted by the varying print orientations assessed.
RESUMO
OBJECTIVE: To identify herbal product use in a dialysis population. DESIGN AND SETTING: Cross-sectional survey conducted at 2 freestanding dialysis centers in Northwest Ohio. PATIENTS: Two hundred and sixteen hemodialysis and peritoneal dialysis patients who provided informed consent. INTERVENTION: All patients were surveyed by personal interview regarding use of herbal products. Patients identified as current users were asked questions about specific agents. Respondents reporting past but not current use were questioned about specific agents and reasons for discontinuation. RESULTS: Thirty-one patients reported taking herbal therapies. Twenty-six patients discontinued use before the survey. Sixteen different herbal products were reported being used in our study population. Those who reported ever using an herbal product were more likely to be employed or disabled and have higher education when compared with nonusers. CONCLUSION: Our data suggest a lower frequency of herbal product use in the dialysis population as compared with the general population and other chronically ill populations. Education and employment are factors associated with use. Many of the herbal therapies used potentially could have significant adverse effects in dialysis patients. These include effects on blood pressure, blood glucose, coagulation parameters, and electrolyte disturbances. Dialysis patients currently taking herbal products may not be reevaluating their need for continuation and may not be informing members of the nephrology care team about their use.
