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Related Concept Videos

Veneer01:19

Veneer

379
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...
379
Tooth Anatomy01:21

Tooth Anatomy

2.1K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
2.1K
Preparation of Amides01:29

Preparation of Amides

4.0K
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
4.0K
Preparation of Nitriles01:12

Preparation of Nitriles

2.7K
One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
2.7K
Preparation of Epoxides03:00

Preparation of Epoxides

9.2K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
9.2K
Preparation of Acid Anhydrides01:07

Preparation of Acid Anhydrides

4.0K
One of the methods for preparing symmetrical or unsymmetrical acid anhydrides involves the treatment of acid chlorides with the sodium salt of carboxylic acids. The reaction proceeds via a nucleophilic acyl substitution.
The carboxylate ion acts as a nucleophile that attacks the carbonyl carbon of the acid chloride to form a tetrahedral intermediate. Subsequently, the re-formation of the carbonyl group with the loss of the chloride ion as a leaving group leads to the formation of an acid...
4.0K

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Related Experiment Video

Updated: Jan 25, 2026

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

Published on: December 20, 2024

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Tooth preparation for ceramic veneers: when less is more.

Arcelino Farias-Neto, Fernanda Cristina Dantas de Medeiros, Larissa Vilanova

    The International Journal of Esthetic Dentistry
    |May 8, 2019
    PubMed
    Summary

    Minimally invasive dentistry prioritizes conservative tooth preparation for ceramic veneers, enhancing adhesion and longevity. The mock-up driven technique guides conservative preparations, considering the final veneer contour for improved clinical outcomes.

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    Area of Science:

    • Dentistry
    • Restorative Dentistry
    • Esthetic Dentistry

    Background:

    • Historically, ceramic veneer preparations ranged from aggressive to minimal reduction.
    • Current trends favor minimally invasive dentistry, emphasizing tooth structure preservation.
    • Less tooth reduction correlates with improved adhesion and clinical longevity.

    Purpose of the Study:

    • To present a step-by-step protocol for conservative ceramic veneer preparations.
    • To introduce the mock-up driven technique for veneer preparation.
    • To achieve less invasive dental preparations while considering final veneer contour.

    Main Methods:

    • The study proposes a step-by-step protocol for veneer preparation.
    • The technique is termed the 'mock-up driven technique'.
    • This method integrates the desired final veneer contour into the preparation design.

    Main Results:

    • The mock-up driven technique facilitates conservative dental preparations.
    • This approach accounts for modifications needed for the final veneer contour.
    • It results in significantly less invasive preparations compared to traditional methods.

    Conclusions:

    • The mock-up driven technique enables conservative ceramic veneer preparations.
    • This method balances esthetic goals with minimal tooth reduction.
    • It supports the principles of minimally invasive dentistry for enhanced longevity.