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Injection Shrinkage аnd Water Sorption of Some Thermoplastic Dental Materials
Chuchulska, Bozhana; Yankov, Stoyan; Todorov, Rangel; Ivanova, Daniela; Kalachev, Yavor.
  • Chuchulska, Bozhana; s.af
  • Yankov, Stoyan; s.af
  • Todorov, Rangel; s.af
  • Ivanova, Daniela; s.af
  • Kalachev, Yavor; s.af
Pesqui. bras. odontopediatria clín. integr ; 19(1): 4474, 01 Fevereiro 2019. tab, graf
Article in English | LILACS, BBO | ID: biblio-998256
ABSTRACT

Objective:

To evaluate the change of diameter of different injection-molded thermoplastic materials. Material and

Methods:

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.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Dental Prosthesis / Dental Impression Materials / Denture Bases / Materials Science Type of study: Evaluation studies Country/Region as subject: Europa Language: English Journal: Pesqui. bras. odontopediatria clín. integr Journal subject: Dentistry Year: 2019 Type: Article

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Full text: Available Index: LILACS (Americas) Main subject: Dental Prosthesis / Dental Impression Materials / Denture Bases / Materials Science Type of study: Evaluation studies Country/Region as subject: Europa Language: English Journal: Pesqui. bras. odontopediatria clín. integr Journal subject: Dentistry Year: 2019 Type: Article