Considerations for proper selection of dental cements.

Selecting the proper cement for sufficient bond strength has become progressively complicated as the number of different materials for indirect restorations has increased. The success of any restoration is highly dependent on the proper cement being chosen and used. The function of the cement is not only to seal the restoration on the tooth but also, in some cases, to support the retention of the restoration. This ability to strengthen retention varies by the cement chosen by the clinician; therefore, careful consideration must precede cement selection.

Computer assisted learning: a new paradigm in dental education.

Computer assisted simulation is an important teaching modality in the preclinical training of students. In order to maximize the potential of this learning tool, the University of Tennessee's College of Dentistry has successfully incorporated DentSim technology into the restorative curriculum and has recently acquired the technology to make image guided implantology available to students, residents and faculty. This article describes the university's history and experience with simulation as a learning tool. The purpose of this article is to provide information to other educational institutions on the use of virtual reality simulation in the classroom.

Variations in the mechanical properties of Alouatta palliata molar enamel.

Teeth have provided insights into many topics including primate diet, paleobiology, and evolution, due to the fact that they are largely composed of inorganic materials and may remain intact long after an animal is deceased. Previous studies have reported that the mechanical properties, chemistry, and microstructure of human enamel vary with location. This study uses nanoindentation to map out the mechanical properties of Alouatta palliata molar enamel on an axial cross-section of an unworn permanent third molar, a worn permanent first molar, and a worn deciduous first molar. Variations were then correlated with changes in microstructure and chemistry using scanning electron microscopy and electron microprobe techniques. The hardness and Young's modulus varied with location throughout the cross-sections from the occlusal surface to the dentin-enamel junction (DEJ), from the buccal to lingual sides, and also from one tooth to another. These changes in mechanical properties correlated with changes in the organic content of the tooth, which was shown to increase from approximately 6% near the occlusal surface to approximately 20% just before the DEJ. Compared to human enamel, the Alouatta enamel showed similar microstructures, chemical constituents, and magnitudes of mechanical properties, but showed less variation in hardness and Young's modulus, despite the very different diet of this species.

Comparison of centering pregnancy to traditional care in Hispanic mothers.

OBJECTIVE: To compare maternal and infant outcomes in Hispanic women participating in the Centering Pregnancy Model (CPM) to those receiving prenatal care via the traditional model and determine acceptability of the CPM. METHODS: Forty-nine women (n = 24 CPM; n = 25 traditional) participated in this quasi-experimental prospective comparative design. Participants self selected the model of care delivery. Data were collected via questionnaires at the initial visit, 34-36 weeks gestation, and postpartum. Outcome measures included: satisfaction with care delivery model, health behaviors, prenatal/postnatal care knowledge, self-esteem and depression. Breastfeeding initiation and continuation, infant birth weight, gestational age at delivery, mode of delivery and infant length of stay were also collected. RESULTS: Traditional participants had a history of more pregnancies, more living children, and higher levels of postpartum self-esteem compared to centering participants. Knowledge deficits and health behaviors were similar between groups. No differences were found for infant outcomes. CONCLUSIONS: This study provides information regarding Hispanic mothers' responses to an alternative care delivery model. Preliminary evidence suggests CPM compares with traditional care and yields a high degree of patient satisfaction. Specific pregnancy-related knowledge deficits were identified in both groups that could focus prenatal education. In light of similar outcomes in both groups; patient and provider satisfaction and economics would therefore be a factor when choosing a model of prenatal care delivery.