Hardness comparison of bulk-filled/transtooth and incremental-filled/occlusally irradiated composite resins

David A. Lazarchik, Barry D. Hammond, Christy L. Sikes, Stephen W. Looney, Frederick A. Rueggeberg

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Statement of problem: Use of a bulk-fill/transtooth composite resin insertion/irradiation technique may not provide as well polymerized a restoration as when using a conventional incremental placement/irradiation technique. Little information exists as to how the hardness of restorations produced by the 2 techniques compare. Purpose: The purpose of this study was to determine the effect of composite resin placement and an irradiation technique on the axial hardness at various depths in a Class I composite resin to include the influence of composite resin filler classification and shade. Material and methods: Cylindrical Class I preparations were made in 70 recently extracted human molars and restored with either a light (A1) or dark shade (A4) of a microfill, microhybrid, or nanohybrid composite resin, or with a single shade of a translucent material. Half were placed using a conventional 2-mm-thick incremental-fill/occlusal irradiation technique, and half using a bulk-fill/transtooth irradiation method (n=5). Specimens were sectioned occluso-apically and axial Knoop hardness values were obtained at depths of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm. Hardness at 0.5 mm was used as a control to compare to deeper readings. Statistical analyses consisted of multiple ANOVAs and Dunnett's post-hoc tests performed at appropriately determined significance levels. Results: For 3 multishaded materials tested, axial hardness values were relatively unaffected by composite resin shade or filler classification for the incremental technique, but were significantly affected by these factors when using the bulk-fill/transtooth irradiation method. A single shade translucent material was not affected in either the bulk or incremental condition. Conclusions: Use of a bulk-fill/transtooth irradiation technique for composite resin placement does not result in axial hardness values equivalent to that of an incremental-fill/occlusal irradiation technique.

Original languageEnglish (US)
Pages (from-to)129-140
Number of pages12
JournalJournal of Prosthetic Dentistry
Volume98
Issue number2
DOIs
StatePublished - Aug 1 2007

Fingerprint

Composite Resins
Hardness
Reading
Analysis of Variance
Light

ASJC Scopus subject areas

  • Oral Surgery

Cite this

Hardness comparison of bulk-filled/transtooth and incremental-filled/occlusally irradiated composite resins. / Lazarchik, David A.; Hammond, Barry D.; Sikes, Christy L.; Looney, Stephen W.; Rueggeberg, Frederick A.

In: Journal of Prosthetic Dentistry, Vol. 98, No. 2, 01.08.2007, p. 129-140.

Research output: Contribution to journalArticle

@article{5609cfdd498d4040968ef675fc350d43,
title = "Hardness comparison of bulk-filled/transtooth and incremental-filled/occlusally irradiated composite resins",
abstract = "Statement of problem: Use of a bulk-fill/transtooth composite resin insertion/irradiation technique may not provide as well polymerized a restoration as when using a conventional incremental placement/irradiation technique. Little information exists as to how the hardness of restorations produced by the 2 techniques compare. Purpose: The purpose of this study was to determine the effect of composite resin placement and an irradiation technique on the axial hardness at various depths in a Class I composite resin to include the influence of composite resin filler classification and shade. Material and methods: Cylindrical Class I preparations were made in 70 recently extracted human molars and restored with either a light (A1) or dark shade (A4) of a microfill, microhybrid, or nanohybrid composite resin, or with a single shade of a translucent material. Half were placed using a conventional 2-mm-thick incremental-fill/occlusal irradiation technique, and half using a bulk-fill/transtooth irradiation method (n=5). Specimens were sectioned occluso-apically and axial Knoop hardness values were obtained at depths of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm. Hardness at 0.5 mm was used as a control to compare to deeper readings. Statistical analyses consisted of multiple ANOVAs and Dunnett's post-hoc tests performed at appropriately determined significance levels. Results: For 3 multishaded materials tested, axial hardness values were relatively unaffected by composite resin shade or filler classification for the incremental technique, but were significantly affected by these factors when using the bulk-fill/transtooth irradiation method. A single shade translucent material was not affected in either the bulk or incremental condition. Conclusions: Use of a bulk-fill/transtooth irradiation technique for composite resin placement does not result in axial hardness values equivalent to that of an incremental-fill/occlusal irradiation technique.",
author = "Lazarchik, {David A.} and Hammond, {Barry D.} and Sikes, {Christy L.} and Looney, {Stephen W.} and Rueggeberg, {Frederick A.}",
year = "2007",
month = "8",
day = "1",
doi = "10.1016/S0022-3913(07)60046-8",
language = "English (US)",
volume = "98",
pages = "129--140",
journal = "Journal of Prosthetic Dentistry",
issn = "0022-3913",
publisher = "Mosby Inc.",
number = "2",

}

TY - JOUR

T1 - Hardness comparison of bulk-filled/transtooth and incremental-filled/occlusally irradiated composite resins

AU - Lazarchik, David A.

AU - Hammond, Barry D.

AU - Sikes, Christy L.

AU - Looney, Stephen W.

AU - Rueggeberg, Frederick A.

PY - 2007/8/1

Y1 - 2007/8/1

N2 - Statement of problem: Use of a bulk-fill/transtooth composite resin insertion/irradiation technique may not provide as well polymerized a restoration as when using a conventional incremental placement/irradiation technique. Little information exists as to how the hardness of restorations produced by the 2 techniques compare. Purpose: The purpose of this study was to determine the effect of composite resin placement and an irradiation technique on the axial hardness at various depths in a Class I composite resin to include the influence of composite resin filler classification and shade. Material and methods: Cylindrical Class I preparations were made in 70 recently extracted human molars and restored with either a light (A1) or dark shade (A4) of a microfill, microhybrid, or nanohybrid composite resin, or with a single shade of a translucent material. Half were placed using a conventional 2-mm-thick incremental-fill/occlusal irradiation technique, and half using a bulk-fill/transtooth irradiation method (n=5). Specimens were sectioned occluso-apically and axial Knoop hardness values were obtained at depths of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm. Hardness at 0.5 mm was used as a control to compare to deeper readings. Statistical analyses consisted of multiple ANOVAs and Dunnett's post-hoc tests performed at appropriately determined significance levels. Results: For 3 multishaded materials tested, axial hardness values were relatively unaffected by composite resin shade or filler classification for the incremental technique, but were significantly affected by these factors when using the bulk-fill/transtooth irradiation method. A single shade translucent material was not affected in either the bulk or incremental condition. Conclusions: Use of a bulk-fill/transtooth irradiation technique for composite resin placement does not result in axial hardness values equivalent to that of an incremental-fill/occlusal irradiation technique.

AB - Statement of problem: Use of a bulk-fill/transtooth composite resin insertion/irradiation technique may not provide as well polymerized a restoration as when using a conventional incremental placement/irradiation technique. Little information exists as to how the hardness of restorations produced by the 2 techniques compare. Purpose: The purpose of this study was to determine the effect of composite resin placement and an irradiation technique on the axial hardness at various depths in a Class I composite resin to include the influence of composite resin filler classification and shade. Material and methods: Cylindrical Class I preparations were made in 70 recently extracted human molars and restored with either a light (A1) or dark shade (A4) of a microfill, microhybrid, or nanohybrid composite resin, or with a single shade of a translucent material. Half were placed using a conventional 2-mm-thick incremental-fill/occlusal irradiation technique, and half using a bulk-fill/transtooth irradiation method (n=5). Specimens were sectioned occluso-apically and axial Knoop hardness values were obtained at depths of 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 mm. Hardness at 0.5 mm was used as a control to compare to deeper readings. Statistical analyses consisted of multiple ANOVAs and Dunnett's post-hoc tests performed at appropriately determined significance levels. Results: For 3 multishaded materials tested, axial hardness values were relatively unaffected by composite resin shade or filler classification for the incremental technique, but were significantly affected by these factors when using the bulk-fill/transtooth irradiation method. A single shade translucent material was not affected in either the bulk or incremental condition. Conclusions: Use of a bulk-fill/transtooth irradiation technique for composite resin placement does not result in axial hardness values equivalent to that of an incremental-fill/occlusal irradiation technique.

UR - http://www.scopus.com/inward/record.url?scp=34547570253&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547570253&partnerID=8YFLogxK

U2 - 10.1016/S0022-3913(07)60046-8

DO - 10.1016/S0022-3913(07)60046-8

M3 - Article

C2 - 17692594

AN - SCOPUS:34547570253

VL - 98

SP - 129

EP - 140

JO - Journal of Prosthetic Dentistry

JF - Journal of Prosthetic Dentistry

SN - 0022-3913

IS - 2

ER -