Difference Between Heavy Body And Light Body Impression Material

A two step impression is when an impression is taken twice the first time with heavy medium body then when that material is set the second step is to add light body over the vps putty for another impression.

Difference between heavy body and light body impression material.

Very low viscosity materials can reproduce lines 1 2 µm wide 5 12 13 it should be noted that the literature does not tend. This phenomenon is called shear thinning chapter 3. With the exception of the very high viscosity putty materials all polyvinyl siloxanes light medium and heavy body achieve this. The same procedure will facilitate spreading of heavy body material on the impression tray and retain it in the tray.

Elastomeric impression materials are used in a variety of dental procedures and improved delivery systems and materials with better properties have made the impression technique more predictable figure 1. Vps viscosity can range from light body. 1 minute 1 minute 15 seconds 1. With heavy impression material the tray distorts distorting your impression but a lot of dentists still use these.

This accelerates the setting reaction resulting in the shortest intra oral setting time among leading vps materials. Impression materials are used to obtain an accurate replica of hard and soft oral tissues. Vps impressions allow for better fitting restorations. In the two step putty light body technique the details are recorded by the light body material only 1 the problem of accuracy of impressions has reported that over 89 of the impressions investigated had one or more observable errors2 3 several factors can influence the quality of impressions including technique4 8 the material5 9 the bulk.

The material allows for a range of viscosities from light body that can be administered with a syringe to heavy body and putty materials often used for bite impressions. Difference between stock trays and custom trays. Advantages over comes the polymerization shrinkage of the light body material margins duplicated in light body disadvantages use of custom tray an assistant required for mixing the material tray syringe simultaneously margins duplicated in heavy body in case of excess pressure. Impression material basics john o.

Essentially a stress thinning material becomes less viscous when stressed as during injection and then recovers its viscosity when it rests on the tissue or or in the tray. What is viscosity control and the difference between light and heavy body materials. Depending on the restoration or impression needed various viscosity vps materials can be used. Depending on the restoration or impression needed various viscosity vps are used.

Innovative active self warming technology makes imprint 4 impression material rapidly heat up to body temperature. Iii light body impression material must reproduce a line 0 020 mm in width.