Elastic modulus maturation effect on shrinkage stress in a primary molar restored with tooth-colored materials

Emily A. Suiter, Daranee Versluis, Lydia E. Watson, Hamid Yazdi, Antheunis Versluis

Research output: Contribution to journalArticle

Abstract

Purpose: Polymerization shrinkage stress is determined by shrinkage as well as elastic modulus. Elastic modulus develops during polymerization. This study evaluated how elastic modulus affects shrinkage stresses in a primary molar for three types of restorative materials. Methods: Elastic modulus of resin composite, compomers, and resin-modified glass ionomer (RMGI) were determined using four-point bending of rectangular beams at 10 minutes, 24 hours, and after one to four weeks storage in water (n equals 10). Results were analyzed using twoway analysis of variance and pairwise comparisons (a equals 0.05). The elastic moduli were used with published shrinkage data to calculate stresses at the tooth-restoration interface in finite element models of a cross-sectioned restored primary molar. Results: The elastic modulus ranged between 5.6 to 19.9 gigapascal. Elastic modulus values were lowest at 10 minutes, regardless of material, and increased significantly (43 to 95 percent) in 24 hours; RMGI continued to increase (64 percent) for one week. Shrinkage stresses increased nonproportionally (resin composite 31 percent, compomer 35 percent, RMGI 52 percent) with increasing elastic modulus for sustained volumetric shrinkage. Conclusions: Elastic modulus development is material dependent and an important factor in polymerization shrinkage stress. Maturation of restorative materials can cause long-lasting stress increases if shrinkage is not alleviated by hygroscopic expansion.

Original languageEnglish (US)
Pages (from-to)370-374
Number of pages5
JournalPediatric dentistry
Volume40
Issue number5
StatePublished - Sep 1 2018

Fingerprint

Elastic Modulus
Tooth
Compomers
Polymerization
Composite Resins
Analysis of Variance
Water

All Science Journal Classification (ASJC) codes

  • Dentistry(all)

Cite this

Elastic modulus maturation effect on shrinkage stress in a primary molar restored with tooth-colored materials. / Suiter, Emily A.; Versluis, Daranee; Watson, Lydia E.; Yazdi, Hamid; Versluis, Antheunis.

In: Pediatric dentistry, Vol. 40, No. 5, 01.09.2018, p. 370-374.

Research output: Contribution to journalArticle

@article{b46e349a13f2458f9dcc1c7750d90902,
title = "Elastic modulus maturation effect on shrinkage stress in a primary molar restored with tooth-colored materials",
abstract = "Purpose: Polymerization shrinkage stress is determined by shrinkage as well as elastic modulus. Elastic modulus develops during polymerization. This study evaluated how elastic modulus affects shrinkage stresses in a primary molar for three types of restorative materials. Methods: Elastic modulus of resin composite, compomers, and resin-modified glass ionomer (RMGI) were determined using four-point bending of rectangular beams at 10 minutes, 24 hours, and after one to four weeks storage in water (n equals 10). Results were analyzed using twoway analysis of variance and pairwise comparisons (a equals 0.05). The elastic moduli were used with published shrinkage data to calculate stresses at the tooth-restoration interface in finite element models of a cross-sectioned restored primary molar. Results: The elastic modulus ranged between 5.6 to 19.9 gigapascal. Elastic modulus values were lowest at 10 minutes, regardless of material, and increased significantly (43 to 95 percent) in 24 hours; RMGI continued to increase (64 percent) for one week. Shrinkage stresses increased nonproportionally (resin composite 31 percent, compomer 35 percent, RMGI 52 percent) with increasing elastic modulus for sustained volumetric shrinkage. Conclusions: Elastic modulus development is material dependent and an important factor in polymerization shrinkage stress. Maturation of restorative materials can cause long-lasting stress increases if shrinkage is not alleviated by hygroscopic expansion.",
author = "Suiter, {Emily A.} and Daranee Versluis and Watson, {Lydia E.} and Hamid Yazdi and Antheunis Versluis",
year = "2018",
month = "9",
day = "1",
language = "English (US)",
volume = "40",
pages = "370--374",
journal = "Pediatric Dentistry",
issn = "0164-1263",
publisher = "American Academy of Pediatric Dentistry",
number = "5",

}

TY - JOUR

T1 - Elastic modulus maturation effect on shrinkage stress in a primary molar restored with tooth-colored materials

AU - Suiter, Emily A.

AU - Versluis, Daranee

AU - Watson, Lydia E.

AU - Yazdi, Hamid

AU - Versluis, Antheunis

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Purpose: Polymerization shrinkage stress is determined by shrinkage as well as elastic modulus. Elastic modulus develops during polymerization. This study evaluated how elastic modulus affects shrinkage stresses in a primary molar for three types of restorative materials. Methods: Elastic modulus of resin composite, compomers, and resin-modified glass ionomer (RMGI) were determined using four-point bending of rectangular beams at 10 minutes, 24 hours, and after one to four weeks storage in water (n equals 10). Results were analyzed using twoway analysis of variance and pairwise comparisons (a equals 0.05). The elastic moduli were used with published shrinkage data to calculate stresses at the tooth-restoration interface in finite element models of a cross-sectioned restored primary molar. Results: The elastic modulus ranged between 5.6 to 19.9 gigapascal. Elastic modulus values were lowest at 10 minutes, regardless of material, and increased significantly (43 to 95 percent) in 24 hours; RMGI continued to increase (64 percent) for one week. Shrinkage stresses increased nonproportionally (resin composite 31 percent, compomer 35 percent, RMGI 52 percent) with increasing elastic modulus for sustained volumetric shrinkage. Conclusions: Elastic modulus development is material dependent and an important factor in polymerization shrinkage stress. Maturation of restorative materials can cause long-lasting stress increases if shrinkage is not alleviated by hygroscopic expansion.

AB - Purpose: Polymerization shrinkage stress is determined by shrinkage as well as elastic modulus. Elastic modulus develops during polymerization. This study evaluated how elastic modulus affects shrinkage stresses in a primary molar for three types of restorative materials. Methods: Elastic modulus of resin composite, compomers, and resin-modified glass ionomer (RMGI) were determined using four-point bending of rectangular beams at 10 minutes, 24 hours, and after one to four weeks storage in water (n equals 10). Results were analyzed using twoway analysis of variance and pairwise comparisons (a equals 0.05). The elastic moduli were used with published shrinkage data to calculate stresses at the tooth-restoration interface in finite element models of a cross-sectioned restored primary molar. Results: The elastic modulus ranged between 5.6 to 19.9 gigapascal. Elastic modulus values were lowest at 10 minutes, regardless of material, and increased significantly (43 to 95 percent) in 24 hours; RMGI continued to increase (64 percent) for one week. Shrinkage stresses increased nonproportionally (resin composite 31 percent, compomer 35 percent, RMGI 52 percent) with increasing elastic modulus for sustained volumetric shrinkage. Conclusions: Elastic modulus development is material dependent and an important factor in polymerization shrinkage stress. Maturation of restorative materials can cause long-lasting stress increases if shrinkage is not alleviated by hygroscopic expansion.

UR - http://www.scopus.com/inward/record.url?scp=85055610182&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85055610182&partnerID=8YFLogxK

M3 - Article

VL - 40

SP - 370

EP - 374

JO - Pediatric Dentistry

JF - Pediatric Dentistry

SN - 0164-1263

IS - 5

ER -