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Crown Ethers

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...

Veneer

Veneer

Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...

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Related Experiment Video

Updated: Mar 19, 2026

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

All-ceramic crown preparations: An alternative technique.

J Tran¹, J Dudley¹, L Richards¹

¹School of Dentistry, Faculty of Health Sciences, The University of Adelaide, Adelaide, South Australia, Australia.

Australian Dental Journal

|June 25, 2016

Summary

This summary is machine-generated.

An alternative crown preparation technique for posterior all-ceramic crowns showed promise. This method resulted in less taper and more ideal occlusal reduction compared to traditional methods.

Keywords:

Crown preparation dental education digital scanning reduction difference total occlusal convergence

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Area of Science:

Dentistry
Dental Prosthetics
Biomaterials

Background:

All-ceramic crowns are widely used in restorative dentistry.
Accurate crown preparation is crucial for long-term success.
Traditional preparation techniques may have limitations.

Purpose of the Study:

To compare crown preparation dimensions using traditional versus an alternative technique for posterior all-ceramic restorations.
To evaluate the effectiveness of advanced simulation training in improving preparation accuracy.

Main Methods:

Twenty-four dental students were trained in an alternative preparation technique.
Crown preparations were performed using both traditional and alternative methods.
Digital scanning and comparative software were used to analyze total occlusal convergence (TOC) and reduction difference (RD).

Main Results:

The alternative technique yielded significantly lower buccolingual (BL) total occlusal convergence (TOC).
Preparations using the alternative technique demonstrated closer adherence to ideal TOC and RD measurements.
Increased practice time with the alternative technique correlated with improved preparation accuracy.

Conclusions:

The alternative crown preparation technique shows potential for improving the taper and occlusal reduction of posterior all-ceramic crowns.
This technique may lead to more precise preparations, enhancing restoration fit and longevity.
Further research is warranted to validate these findings in clinical settings.