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4 results on '"J. Hill"'

1. Electronic Enlightenment Scholarly Edition of Correspondence

Author

Mark J. Hill

Subjects
17th century, early modern, letters, ZA3040-5185, 18th century, AZ20-999, intellectual history, correspondences, History of scholarship and learning. The humanities, history, digital collection, enlightenment, Information resources (General)
Abstract

The Electronic Enlightenment Scholarly Edition of Correspondence (EE), under the directorship of Robert McNamee and made available on a subscription basis by Oxford University Press, is a text collection of over 70,000 individual letters (written between participants of the ‘republic of letters’), biographical details of contributors, and additional contextual information. This review offers an overview of the collection (or, perhaps more accurately, collections) and its technical presentation, and some brief reflections on the benefits and limitations of the database (and others of its sort) within the realm of digital text collections and digital scholarship generally.

Published
2017

3. Tensile bond strength of ceramic crowns to dentin using resin cements.

Author

Simon JF, de Rijk WG, Hill J, and Hill N

Subjects
Acid Etching, Dental methods, Composite Resins chemistry, Computer-Aided Design, Dental Prosthesis Design, Dental Prosthesis Retention, Dental Restoration Failure, Dental Stress Analysis instrumentation, Humans, Hydrofluoric Acid chemistry, Materials Testing, Stress, Mechanical, Surface Properties, Tensile Strength, Tooth Preparation, Prosthodontic classification, Crowns, Dental Bonding, Dental Porcelain chemistry, Dentin ultrastructure, Resin Cements chemistry
Abstract

Purpose: This study measured the bond strength of the self-adhesive resin cements and a bonded resin cement for crowns bonded to extracted teeth with preparations having a total taper greater than 30 degrees. A crown pull-off test was used with direction of pull along the path of insertion. The CAD/CAM system Cerec was used to create crowns with the pull-off loop as an integral part of the crown structure., Materials and Methods: One hundred extracted human molars were prepared for all-ceramic crowns with a 1.5-mm shoulder, greater than 30-degree axial wall convergence, a flat occlusal surface and 3 to 5 mm occlusal/ gingival height. All-ceramic crowns were cemented with five different self-adhesive cements (Rely X Unicem, Maxcem Elite, BisCem, SmartCem 2, and G-Cem) and one bonded resin cement (Multilink). Forfour cements (excluding GCem and Multilink) there were 2 groups, one with HF etching and one without ceramic surface treatment. The crowns were then subject to tensile stress until either the crown fractured or the crown was lifted off from the tooth., Results: For several cements, the bond strength exceeded the tensile strength of the all-ceramic crown; thus, the crown fractured, leaving the cemented part of the crown on the tooth. The effect of ceramic surface etching was not statistically significant at p = 0.05; however, for each cement, the treated crowns showed a lower coefficient of variance (COV). For this study, the COV ranged from 24.9 % to 97.9 %. Loads ranged from 41.3 to 190.3 N., Conclusion: Some of the new self-etching resin cements can create bonds to non-retentive crown preparations that are stronger than the strength of a ceramic crown; however, these high bond strengths may not be able to be achieved consistently.

Published
2011

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