Injection Shrinkage аnd Water Sorption of Some Thermoplastic Dental Materials
Pesqui. bras. odontopediatria clín. integr
; 19(1): 4474, 01 Fevereiro 2019. tab, graf
Article
in En
| LILACS, BBO
| ID: biblio-998256
Responsible library:
BR1264.1
ABSTRACT
Objective:
To evaluate the change of diameter of different injection-molded thermoplastic materials. Material andMethods:
Four thermoplastic injection-molded materials were analyzed (Bre.flex 2nd edition, Vertex ThermoSens, Perflex Biosens and Polyan IC). A total of 432 test samples were made in the form of an "hourglass". All samples were divided into three groups Group I (Control) - consisting of 36 test samples for each type of material, that was not exposed to artificial aging or a wet environment; Group II - consisting of 36 test samples for each type of material, that were artificially aged through dehydration; Group III - specimen were subjected to artificial aging without dehydration. The diameter of each specimen was measured with a digital caliper. Data were analysed using the Student's t-test.Results:
Regarding to shrinkage, the samples from the Bf Control group have a mean value of 1.56 mm and was observed a shrinkage of the injection-molded polyamide material within 0.25%. The comparison between the samples from Group II and Group III showed statistically significant differences (p<0.001). There were no significant differences between groups for Thermosens and Biosens (p>0.05). The comparison between Group II and Group III for Polyan IC samples shows that Group III has a higher arithmetic mean value (p<0.01).Conclusion:
Shrinkage of the polymers during the injection process is present in all materials. The thermocycling and the storage in a dry or in a wet environment of the samples results in a change of the diameter in almost every single type of material.Key words
Full text:
1
Index:
LILACS
Main subject:
Dental Prosthesis
/
Dental Impression Materials
/
Denture Bases
/
Materials Science
Type of study:
Evaluation_studies
Country/Region as subject:
Europa
Language:
En
Journal:
Pesqui. bras. odontopediatria clín. integr
Journal subject:
ODONTOLOGIA
Year:
2019
Type:
Article