English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Purpose: To compare the marginal accuracy of temporary crownsin vitro, using two autopolymerizing temporary crown materials.Materials and methods: Polyethyl methacrylate and bis-acrylcomposite were used to make 15 temporary crowns each, onan ivorine mandibular first molar, prepared as to receive aporcelain-fused-to-metal (PFM) crown. Matrices were made ofpolyvinyl siloxane impressions of a lower typodont arch. Aftercrowns were fabricated, margins of the crowns were trimmedunder magnification. Afterwards, margins of prepared tooth andcrowns were marked. Each tooth-crown assembly was thenobserved under microscope (4×). With digital images of eachsurface, gap between margins of crown and preparation marginwas measured in millimeters using computer software, aftercalibration. Two examiners made the measurements.Independent samples t-test and one-way ANOVA withBonferroni post hoc analysis were applied to determine themean marginal gap.Results: Bis-acryl composite crowns exhibited 0.2 mm (SD  0.11)mean gap with greatest discrepancy at buccal margins. Meangap with polyethyl methacrylate crowns was 0.3 mm (SD  0.17)with buccal and mesial margins exhibiting the greatest marginaldiscrepancy, at α <0.001.Conclusion: Both materials did not exhibit ideal marginalaccuracy, but temporary luting cement film thickness wouldcompensate for the gap observed in the margins of bis-acrylcomposite crowns.

An in vitro Comparison of Marginal Accuracy in Temporary Crowns