PubMed · 9790318
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
E Silverman, M Cohen. 1998. Etching versus nonetching.. https://doi.org/10.1016/s0889-5406(98)70036-8
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
Since most cavity preparations show not only areas of exposed enamel and superficial dentin but also of deep dentinal areas, it would be desirable to use a dental adhesive which can obtain equally good bond strength to these hard tissues. The objective of this study was to measure the bond strength of self-etching adhesives to enamel and superficial and deep dentin. Human molars were ground to expose a surface of enamel or superficial (2.0-2.5 mm distance to pulp) or deep dentin (0.5-1.0 mm), embedded in acrylic resin and assigned to three groups (total n=90). The adhesives tested were: Clearfil SE Bond (SE), Prompt L-Pop (LP), and Etch&Prime 3.0 (EP). After application of the adhesives, an inverted, truncated cone of composite (Pertac II, ESPE) was cured. After storage, specimens were debonded in tension at a cross-head speed of 0.5 mm/min. The median tensile bond strength values to enamel were SE 29.1 MPa, LP 22.4 MPa, and EP 21.5 MPa. The median bond strengths for superficial dentin were SE 27.3 MPa, LP 8.4 MPa, and EP 3.2 MPa. The median bond strengths for deep dentin were SE 20.2 MPa, LP 5.7 MPa, and EP 1.3 MPa. The adhesives tested bonded effectively to enamel, but only SE achieved promising bond strengths to superficial and deep dentin.
OBJECTIVES: The aim of the study was to investigate the relationship between etch patterns produced on surface enamel by phosphoric acid and the corresponding bond strengths achieved. MATERIALS AND METHODS: Twenty-eight patients had the buccal surface of their teeth etched and replicated for examination under the scanning electron microscope, at the commencement of orthodontic treatment. Histometry was employed to assess the nature and quality of etch patterns using a four-point scale. Twenty of each tooth type (total of 240), were collected and A Company pre-adjusted orthodontic brackets, bonded using Transbond light-cured orthodontic adhesive according to the manufacturer's instructions and 24-hour bond strength testing was undertaken. The Adhesive Remnant Index (ARI) was recorded for the tooth and bracket surface for all specimens. RESULTS: The type of etch was not significantly affected by the side (left or right) of the mouth assessed (p = 0.532). Overall, there was no significant difference between etch types for upper and lower teeth (p = 0.218); however, there were significant differences between specific teeth in the upper and lower arch. The greatest amount of Type A etch (well-defined etched enamel prisms) was found on the lower incisors, yet in all cases this 'ideal' etch was found to occupy less than 5% of the etched buccal surface enamel. The greatest area of etched enamel surface was occupied by Type C (etched but enamel prisms not evident). The mean bond strength values varied significantly between different tooth types, with the lowest bond strength found on the upper first molar(6.5MPa) and the highest on the lower first molar (13.1 MPa). CONCLUSIONS: An ideal etch pattern is not essential in order to produce a strong bond.
Explore the source record for details and available documents.