Tooth surface loss. 7. Dealing with failures.
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Dental Bonding↗
Biomedical subjects
J L Wickens
Publications and source records attributed to J L Wickens.
Tooth surface loss. 6. Prevention and maintenance.
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Humans↗
Relationship between contact angles of die stone on elastomeric impression materials and voids in stone casts.
Poor wettability of elastomeric impression materials results in surface defects on stone casts. This study examined the relationship between contact angles of die stone and voids in casts produced from five medium-viscosity impression materials. Contact angles of a die stone material formed against impression specimens made from polyether, addition and condensation silicones were measured by reflex microscope. The contact angle values achieved on the hydrophilic addition silicones were significantly higher than the polyether but lower than other silicone materials. Contact angle values correlated with the number of voids found at margins and line angles of stone casts but not with those on smooth surfaces.
Dental Impression Materials↗
The effect of mixing method on void formation in elastomeric impression materials.
This study compared an automixed elastomer with five hand-mixed elastomeric impression materials by counting the number of voids at a predetermined site using 6 X magnification. Although no samples were free of voids, automixing produced substantially fewer voids than hand mixing.
Dental Impression Materials↗
A comparison of the fit of spark-eroded titanium copings and cast gold alloy copings.
The fit of spark-eroded titanium and cast gold alloy copings was compared by assessment of retrieved cement film analogues. This technique was chosen for its simplicity, nondestructive nature, and for the information it provided on overall fit. The present study showed that the overall fit of titanium copings was comparable to that of gold copings. In marginal areas, the space between die and coping was found to be larger for spark-eroded than cast copings.
Crowns↗