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Related Concept Videos

Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Relative Stabilities of Alkenes01:59

Relative Stabilities of Alkenes

The relative stability of alkenes can be determined by comparing their heats of hydrogenation. The lower heat of hydrogenation indicates the more stable alkene.  The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.

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Related Experiment Video

Updated: May 28, 2026

Improved Polydimethylsiloxane (PDMS) Double Casting via Silicone Oil Treatment for Densely Packed Microstructure Replication
07:01

Improved Polydimethylsiloxane (PDMS) Double Casting via Silicone Oil Treatment for Densely Packed Microstructure Replication

Published on: July 18, 2025

Condensation silicones: do new materials really presents better dimensional stability?

Juliene C Fonte-Boa1, João Maurício L F Mota, Luiz Thadeu A Poletto

  • 1Department of Restorative Dentistry, School of Dentistry, Minas Gerais Federal University, Belo Horizonte, Brazil. jufonteboa@uol.com.br

Acta Odontologica Latinoamericana : AOL
|October 21, 2011
PubMed
Summary
This summary is machine-generated.

This study assessed the dimensional stability of condensation silicones. Some materials remained stable for 30 minutes, while Speedex was stable for 2 hours, with ethanol release noted even after setting.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Condensation silicones are widely used in dentistry for impressions.
  • Understanding their dimensional stability is crucial for accurate prosthodontic work.
  • Material properties can influence the precision of dental restorations.

Purpose of the Study:

  • To evaluate the dimensional stability of specific condensation silicone impression materials.
  • To determine the duration of dimensional accuracy for selected materials.
  • To investigate potential by-product release influencing stability.

Main Methods:

  • Dimensional analysis using a Mitutoyo microscope was performed.
  • Gas chromatography (GC) was employed to detect released substances.
  • Measurements were taken at multiple time points: immediately after setting, and at 30 minutes, 2, 24, 72 hours, and 7 days.

Main Results:

  • Coltex/Coltoflax and Optosil Comfort/Xantopren VL Plus showed dimensional stability up to 30 minutes post-molding.
  • Speedex exhibited dimensional stability for up to 2 hours post-molding.
  • Gas chromatography confirmed ethanol release from all tested materials, persisting even after clinical setting.

Conclusions:

  • The dimensional stability of condensation silicones varies among different products.
  • Early dimensional changes can occur, impacting impression accuracy.
  • Ongoing ethanol release suggests potential long-term material alterations.