The type iii gypsum product demonstrated lower mean expansion values than type ii products. Bruce ady journal of dental research 1960 39 : In addition to the setting expansion, hygroscopic expansion is observed when the gypsum products are exposed to additional water while setting.
CDS
Michalakis kx(1), stratos a, hirayama h, pissiotis al, touloumi f.
The setting expansion of gypsum products can be reduced by_____?
Delayed setting and hygroscopic linear expansion of three gypsum products used for cast articulation. The final measurement should be taken at 120±1 min, counting from the beginning of the mixture of the original components. Michalakis kx, stratos a, hirayama h, pissiotis al, touloumi f. Less water powder ratio d.
Philips science of dm (12th ed) and restorative dm b.
Explanation for the hygroscopic setting expansion of dental gypsum products. An explanation for the hygroscopic setting expansion of dental gypsum products david b. Ø tests for working, setting, & final setting times. Stone casts are used in dentistry to allow the confection of indirect restorations.
J denr res 1960, p.
An explanation for the hygroscopic setting expansion of dental gypsum products j dent res. 12 several theories have been introduced to explain the mechanism for hygroscopic expansion.13, 14, 15, 16 nevertheless, the influence of water on set gypsum products used for cast articulation has not been investigated. Bruce ady journal of dental research 2016 39 : Time and material were more important factors than the dry/wet condition when.
The hygroscopic linear expansion of gypsum products should be periodically controlled in order to ensure their precision and reliability to.
This contains setting expansion of gypsum in detail. (1)department of prosthodontics and operative dentistry, division of graduate and postgraduate prosthodontics, tufts university school of dental medicine. An explanation for the hygroscopic setting expansion of dental gypsum products david b. One hundred grams of each gypsum product were mixed following the respective manufacturers' recommendations for.
The hygroscopic linear expansion of gypsum products should be periodically controlled in order to ensure their precision and reliability to dental practice.
The purpose of the present study was to evaluate the hygroscopic linear expansion of commercially available gypsum products. Up to 24% cash back hygroscopic setting expansion of dental stone or plaster is generally small in magnitude. The expansion of all gypsum products used for articulation purposes was complete at 96 hours. Fifteen dental stones were analyzed (4 type ii, 5 type iii, 4 type iv and 2 type v), with n = 5.
Michalakis kx, stratos a, hirayama h, pissiotis al, touloumi f.
Delayed setting and hygroscopic linear expansion of three gypsum products used for cast articulation. Dental stone for making cast may exhibit a normal linear setting expansion of 0.15% with maximum hygroscopic setting expansion of 0.30%. Dental materials dental materials mcqs for preparation. Delayed setting and hygroscopic linear expansion of three gypsum products used for cast articulation.
This contains setting expansion of gypsum in detail.
Ø proportioning, mixing & caring for gypsum products. Ø types of gypsum products. Delayed setting and hygroscopic linear expansion of three gypsum products used for cast articulation. Ø setting of gypsum products.
It is well known that the gypsum (caso 4 ·2h 2 o) solution used in the present work undergoes a phenomenon known as hygroscopic expansion upon setting in.
These mcqs are helpful for medical students. Is the expansion same for all the five gypsum products?
