Effects of calcium silicate-based materials on the flexural properties of dentin

Allen N. Sawyer, Sergey Y. Nikonov, Alaina K. Pancio, Li Na Niu, Kelli A. Agee, Robert J. Loushine, Roger N. Weller, David Henry Pashley, Franklin Chi Meng Tay

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Introduction: Prolonged exposure of root dentin to calcium hydroxide alters the fracture resistance of dentin. Calcium silicate-based materials (CSMs) used in endodontics release calcium hydroxide on setting. This study examined whether prolonged contact of dentin with CSMs adversely affects its mechanical properties. Methods: Dentin beams prepared from extracted human molars (7 × 3 × 0.3 mm) were divided into 3 groups on the basis of the material to which dentin was exposed (Biodentine, MTA Plus, and untreated control beams). Three-point flexure to failure was performed for each beam at designated exposure times (24 hours, 1, 2, and 3 months; n = 10). Data were analyzed with 2-factor repeated-measures analyses of variance to determine the effects of material and aging time on flexural modulus, flexural strength, and modulus of toughness (α = 0.05). Results: For flexural modulus, there was no significant difference for material (P =.947) or aging time (P =.064) when compared with baseline control. For flexural strength, significant differences were associated with aging time (P <.001) but not with material (P =.349). Flexural strength of dentin exposed to Biodentine decreased significantly after 2 and 3 months, whereas that exposed to MTA Plus decreased significantly after 3 months of aging (P <.05). For modulus of toughness, significant declines were observed for both material (P <.004) and aging time (P <.001). Conclusions: Both CSMs alter material toughness more than the strength and stiffness of dentin after aging in 100% relative humidity. Because dentin toughness is attributed to its collagen matrix, the amount of collagen extracted from mineralized dentin and changes in collagen ultrastructure should be further examined after exposure of dentin to CSMs.

Original languageEnglish (US)
Pages (from-to)680-683
Number of pages4
JournalJournal of Endodontics
Volume38
Issue number5
DOIs
StatePublished - May 1 2012

Fingerprint

Dentin
Pemetrexed
Calcium Hydroxide
Collagen
calcium silicate
Endodontics
Humidity
Analysis of Variance

Keywords

  • Calcium silicate
  • dentin
  • flexural modulus
  • flexural strength
  • modulus of toughness

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Sawyer, A. N., Nikonov, S. Y., Pancio, A. K., Niu, L. N., Agee, K. A., Loushine, R. J., ... Tay, F. C. M. (2012). Effects of calcium silicate-based materials on the flexural properties of dentin. Journal of Endodontics, 38(5), 680-683. https://doi.org/10.1016/j.joen.2011.12.036

Effects of calcium silicate-based materials on the flexural properties of dentin. / Sawyer, Allen N.; Nikonov, Sergey Y.; Pancio, Alaina K.; Niu, Li Na; Agee, Kelli A.; Loushine, Robert J.; Weller, Roger N.; Pashley, David Henry; Tay, Franklin Chi Meng.

In: Journal of Endodontics, Vol. 38, No. 5, 01.05.2012, p. 680-683.

Research output: Contribution to journalArticle

Sawyer, AN, Nikonov, SY, Pancio, AK, Niu, LN, Agee, KA, Loushine, RJ, Weller, RN, Pashley, DH & Tay, FCM 2012, 'Effects of calcium silicate-based materials on the flexural properties of dentin', Journal of Endodontics, vol. 38, no. 5, pp. 680-683. https://doi.org/10.1016/j.joen.2011.12.036
Sawyer AN, Nikonov SY, Pancio AK, Niu LN, Agee KA, Loushine RJ et al. Effects of calcium silicate-based materials on the flexural properties of dentin. Journal of Endodontics. 2012 May 1;38(5):680-683. https://doi.org/10.1016/j.joen.2011.12.036
Sawyer, Allen N. ; Nikonov, Sergey Y. ; Pancio, Alaina K. ; Niu, Li Na ; Agee, Kelli A. ; Loushine, Robert J. ; Weller, Roger N. ; Pashley, David Henry ; Tay, Franklin Chi Meng. / Effects of calcium silicate-based materials on the flexural properties of dentin. In: Journal of Endodontics. 2012 ; Vol. 38, No. 5. pp. 680-683.
@article{9969761683e3416ebd2cc7d9c7a643a6,
title = "Effects of calcium silicate-based materials on the flexural properties of dentin",
abstract = "Introduction: Prolonged exposure of root dentin to calcium hydroxide alters the fracture resistance of dentin. Calcium silicate-based materials (CSMs) used in endodontics release calcium hydroxide on setting. This study examined whether prolonged contact of dentin with CSMs adversely affects its mechanical properties. Methods: Dentin beams prepared from extracted human molars (7 × 3 × 0.3 mm) were divided into 3 groups on the basis of the material to which dentin was exposed (Biodentine, MTA Plus, and untreated control beams). Three-point flexure to failure was performed for each beam at designated exposure times (24 hours, 1, 2, and 3 months; n = 10). Data were analyzed with 2-factor repeated-measures analyses of variance to determine the effects of material and aging time on flexural modulus, flexural strength, and modulus of toughness (α = 0.05). Results: For flexural modulus, there was no significant difference for material (P =.947) or aging time (P =.064) when compared with baseline control. For flexural strength, significant differences were associated with aging time (P <.001) but not with material (P =.349). Flexural strength of dentin exposed to Biodentine decreased significantly after 2 and 3 months, whereas that exposed to MTA Plus decreased significantly after 3 months of aging (P <.05). For modulus of toughness, significant declines were observed for both material (P <.004) and aging time (P <.001). Conclusions: Both CSMs alter material toughness more than the strength and stiffness of dentin after aging in 100{\%} relative humidity. Because dentin toughness is attributed to its collagen matrix, the amount of collagen extracted from mineralized dentin and changes in collagen ultrastructure should be further examined after exposure of dentin to CSMs.",
keywords = "Calcium silicate, dentin, flexural modulus, flexural strength, modulus of toughness",
author = "Sawyer, {Allen N.} and Nikonov, {Sergey Y.} and Pancio, {Alaina K.} and Niu, {Li Na} and Agee, {Kelli A.} and Loushine, {Robert J.} and Weller, {Roger N.} and Pashley, {David Henry} and Tay, {Franklin Chi Meng}",
year = "2012",
month = "5",
day = "1",
doi = "10.1016/j.joen.2011.12.036",
language = "English (US)",
volume = "38",
pages = "680--683",
journal = "Journal of Endodontics",
issn = "0099-2399",
publisher = "Elsevier Inc.",
number = "5",

}

TY - JOUR

T1 - Effects of calcium silicate-based materials on the flexural properties of dentin

AU - Sawyer, Allen N.

AU - Nikonov, Sergey Y.

AU - Pancio, Alaina K.

AU - Niu, Li Na

AU - Agee, Kelli A.

AU - Loushine, Robert J.

AU - Weller, Roger N.

AU - Pashley, David Henry

AU - Tay, Franklin Chi Meng

PY - 2012/5/1

Y1 - 2012/5/1

N2 - Introduction: Prolonged exposure of root dentin to calcium hydroxide alters the fracture resistance of dentin. Calcium silicate-based materials (CSMs) used in endodontics release calcium hydroxide on setting. This study examined whether prolonged contact of dentin with CSMs adversely affects its mechanical properties. Methods: Dentin beams prepared from extracted human molars (7 × 3 × 0.3 mm) were divided into 3 groups on the basis of the material to which dentin was exposed (Biodentine, MTA Plus, and untreated control beams). Three-point flexure to failure was performed for each beam at designated exposure times (24 hours, 1, 2, and 3 months; n = 10). Data were analyzed with 2-factor repeated-measures analyses of variance to determine the effects of material and aging time on flexural modulus, flexural strength, and modulus of toughness (α = 0.05). Results: For flexural modulus, there was no significant difference for material (P =.947) or aging time (P =.064) when compared with baseline control. For flexural strength, significant differences were associated with aging time (P <.001) but not with material (P =.349). Flexural strength of dentin exposed to Biodentine decreased significantly after 2 and 3 months, whereas that exposed to MTA Plus decreased significantly after 3 months of aging (P <.05). For modulus of toughness, significant declines were observed for both material (P <.004) and aging time (P <.001). Conclusions: Both CSMs alter material toughness more than the strength and stiffness of dentin after aging in 100% relative humidity. Because dentin toughness is attributed to its collagen matrix, the amount of collagen extracted from mineralized dentin and changes in collagen ultrastructure should be further examined after exposure of dentin to CSMs.

AB - Introduction: Prolonged exposure of root dentin to calcium hydroxide alters the fracture resistance of dentin. Calcium silicate-based materials (CSMs) used in endodontics release calcium hydroxide on setting. This study examined whether prolonged contact of dentin with CSMs adversely affects its mechanical properties. Methods: Dentin beams prepared from extracted human molars (7 × 3 × 0.3 mm) were divided into 3 groups on the basis of the material to which dentin was exposed (Biodentine, MTA Plus, and untreated control beams). Three-point flexure to failure was performed for each beam at designated exposure times (24 hours, 1, 2, and 3 months; n = 10). Data were analyzed with 2-factor repeated-measures analyses of variance to determine the effects of material and aging time on flexural modulus, flexural strength, and modulus of toughness (α = 0.05). Results: For flexural modulus, there was no significant difference for material (P =.947) or aging time (P =.064) when compared with baseline control. For flexural strength, significant differences were associated with aging time (P <.001) but not with material (P =.349). Flexural strength of dentin exposed to Biodentine decreased significantly after 2 and 3 months, whereas that exposed to MTA Plus decreased significantly after 3 months of aging (P <.05). For modulus of toughness, significant declines were observed for both material (P <.004) and aging time (P <.001). Conclusions: Both CSMs alter material toughness more than the strength and stiffness of dentin after aging in 100% relative humidity. Because dentin toughness is attributed to its collagen matrix, the amount of collagen extracted from mineralized dentin and changes in collagen ultrastructure should be further examined after exposure of dentin to CSMs.

KW - Calcium silicate

KW - dentin

KW - flexural modulus

KW - flexural strength

KW - modulus of toughness

UR - http://www.scopus.com/inward/record.url?scp=84859860795&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859860795&partnerID=8YFLogxK

U2 - 10.1016/j.joen.2011.12.036

DO - 10.1016/j.joen.2011.12.036

M3 - Article

VL - 38

SP - 680

EP - 683

JO - Journal of Endodontics

JF - Journal of Endodontics

SN - 0099-2399

IS - 5

ER -