Tooth deformation patterns in molars after composite restoration

Daranee Tantbirojn; Antheunis Versluis; Maria R. Pintado; Ralph DeLong; William H. Douglas

doi:10.1016/j.dental.2003.05.008

Tooth deformation patterns in molars after composite restoration

Daranee Tantbirojn, Antheunis Versluis, Maria R. Pintado, Ralph DeLong, William H. Douglas

Biomaterials

Research output: Contribution to journal › Article › peer-review

150 Scopus citations

Abstract

Objective. Residual stresses from polymerization shrinkage in composite restorations deform a tooth. This may cause debonding, enamel crack propagation, and post-operative sensitivity. Deformation due to shrinkage has been measured previously at a few discrete points. The purpose of this study was to analyze cuspal deformation pattern of the occlusal portion of molars for various cavity types and sizes after restoration with a light-initiated composite. Methods. Five extracted human molars were successively prepared as Class I, Class II OM, large Class II OM, and large Class II MOD. The cavities were filled with a light-curing composite using a dentin adhesive system. The occlusal portion of the unrestored cavity and the restoration were digitized with a profilometer. The digitized data of the unrestored and restored tooth were used to calculate the cuspal contour change with Cumulus software. Deformation was visualized as a color contour map. Results. Cuspal deformation showed up in the contour map as a reduction of buccal and lingual contour perpendicular to the surface. Large Class II MODs exhibited the highest cuspal deformation, followed by large OM restorations. Cuspal deformations in Class I and small Class II OM restorations were not significantly different. Significance. When a composite restoration was cured, the surrounding tooth deformed due to polymerization shrinkage. Cavity type and size affected how much cusps moved inward as a result of polymerization shrinkage. This study quantified and visualized the pattern of cuspal deformation.

Original language	English (US)
Pages (from-to)	535-542
Number of pages	8
Journal	Dental Materials
Volume	20
Issue number	6
DOIs	https://doi.org/10.1016/j.dental.2003.05.008
State	Published - Jul 2004

Bibliographical note

Funding Information:
Based in part on abstract No. 499, presented at the 80th IADR meeting in San Diego, March 6–9, 2002. The authors thank Matt Heinzen for his assistance with the Cumulus analysis. Materials used in the study were supplied by 3M ESPE (St Paul, MN, USA). This study was supported by the Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, a Faculty Developing Grant, Chulalongkorn University, Bangkok, Thailand, and a grant from NIH/NIDR (R01-DE12225).

Keywords

Composite restoration
Cusp flexure
Deformation
Polymerization shrinkage
Shrinkage stress

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10.1016/j.dental.2003.05.008

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title = "Tooth deformation patterns in molars after composite restoration",

abstract = "Objective. Residual stresses from polymerization shrinkage in composite restorations deform a tooth. This may cause debonding, enamel crack propagation, and post-operative sensitivity. Deformation due to shrinkage has been measured previously at a few discrete points. The purpose of this study was to analyze cuspal deformation pattern of the occlusal portion of molars for various cavity types and sizes after restoration with a light-initiated composite. Methods. Five extracted human molars were successively prepared as Class I, Class II OM, large Class II OM, and large Class II MOD. The cavities were filled with a light-curing composite using a dentin adhesive system. The occlusal portion of the unrestored cavity and the restoration were digitized with a profilometer. The digitized data of the unrestored and restored tooth were used to calculate the cuspal contour change with Cumulus software. Deformation was visualized as a color contour map. Results. Cuspal deformation showed up in the contour map as a reduction of buccal and lingual contour perpendicular to the surface. Large Class II MODs exhibited the highest cuspal deformation, followed by large OM restorations. Cuspal deformations in Class I and small Class II OM restorations were not significantly different. Significance. When a composite restoration was cured, the surrounding tooth deformed due to polymerization shrinkage. Cavity type and size affected how much cusps moved inward as a result of polymerization shrinkage. This study quantified and visualized the pattern of cuspal deformation.",

keywords = "Composite restoration, Cusp flexure, Deformation, Polymerization shrinkage, Shrinkage stress",

author = "Daranee Tantbirojn and Antheunis Versluis and Pintado, {Maria R.} and Ralph DeLong and Douglas, {William H.}",

note = "Funding Information: Based in part on abstract No. 499, presented at the 80th IADR meeting in San Diego, March 6–9, 2002. The authors thank Matt Heinzen for his assistance with the Cumulus analysis. Materials used in the study were supplied by 3M ESPE (St Paul, MN, USA). This study was supported by the Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, a Faculty Developing Grant, Chulalongkorn University, Bangkok, Thailand, and a grant from NIH/NIDR (R01-DE12225).",

year = "2004",

month = jul,

doi = "10.1016/j.dental.2003.05.008",

language = "English (US)",

volume = "20",

pages = "535--542",

journal = "Dental Materials",

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TY - JOUR

T1 - Tooth deformation patterns in molars after composite restoration

AU - Tantbirojn, Daranee

AU - Versluis, Antheunis

AU - Pintado, Maria R.

AU - DeLong, Ralph

AU - Douglas, William H.

N1 - Funding Information: Based in part on abstract No. 499, presented at the 80th IADR meeting in San Diego, March 6–9, 2002. The authors thank Matt Heinzen for his assistance with the Cumulus analysis. Materials used in the study were supplied by 3M ESPE (St Paul, MN, USA). This study was supported by the Minnesota Dental Research Center for Biomaterials and Biomechanics, University of Minnesota, a Faculty Developing Grant, Chulalongkorn University, Bangkok, Thailand, and a grant from NIH/NIDR (R01-DE12225).

PY - 2004/7

Y1 - 2004/7

N2 - Objective. Residual stresses from polymerization shrinkage in composite restorations deform a tooth. This may cause debonding, enamel crack propagation, and post-operative sensitivity. Deformation due to shrinkage has been measured previously at a few discrete points. The purpose of this study was to analyze cuspal deformation pattern of the occlusal portion of molars for various cavity types and sizes after restoration with a light-initiated composite. Methods. Five extracted human molars were successively prepared as Class I, Class II OM, large Class II OM, and large Class II MOD. The cavities were filled with a light-curing composite using a dentin adhesive system. The occlusal portion of the unrestored cavity and the restoration were digitized with a profilometer. The digitized data of the unrestored and restored tooth were used to calculate the cuspal contour change with Cumulus software. Deformation was visualized as a color contour map. Results. Cuspal deformation showed up in the contour map as a reduction of buccal and lingual contour perpendicular to the surface. Large Class II MODs exhibited the highest cuspal deformation, followed by large OM restorations. Cuspal deformations in Class I and small Class II OM restorations were not significantly different. Significance. When a composite restoration was cured, the surrounding tooth deformed due to polymerization shrinkage. Cavity type and size affected how much cusps moved inward as a result of polymerization shrinkage. This study quantified and visualized the pattern of cuspal deformation.

AB - Objective. Residual stresses from polymerization shrinkage in composite restorations deform a tooth. This may cause debonding, enamel crack propagation, and post-operative sensitivity. Deformation due to shrinkage has been measured previously at a few discrete points. The purpose of this study was to analyze cuspal deformation pattern of the occlusal portion of molars for various cavity types and sizes after restoration with a light-initiated composite. Methods. Five extracted human molars were successively prepared as Class I, Class II OM, large Class II OM, and large Class II MOD. The cavities were filled with a light-curing composite using a dentin adhesive system. The occlusal portion of the unrestored cavity and the restoration were digitized with a profilometer. The digitized data of the unrestored and restored tooth were used to calculate the cuspal contour change with Cumulus software. Deformation was visualized as a color contour map. Results. Cuspal deformation showed up in the contour map as a reduction of buccal and lingual contour perpendicular to the surface. Large Class II MODs exhibited the highest cuspal deformation, followed by large OM restorations. Cuspal deformations in Class I and small Class II OM restorations were not significantly different. Significance. When a composite restoration was cured, the surrounding tooth deformed due to polymerization shrinkage. Cavity type and size affected how much cusps moved inward as a result of polymerization shrinkage. This study quantified and visualized the pattern of cuspal deformation.

KW - Composite restoration

KW - Cusp flexure

KW - Deformation

KW - Polymerization shrinkage

KW - Shrinkage stress

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U2 - 10.1016/j.dental.2003.05.008

DO - 10.1016/j.dental.2003.05.008

M3 - Article

C2 - 15134941

AN - SCOPUS:2342521245

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VL - 20

SP - 535

EP - 542

JO - Dental Materials

JF - Dental Materials

IS - 6

ER -

Tooth deformation patterns in molars after composite restoration

Abstract

Bibliographical note

Keywords

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