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Evaluation of cuspal deflection in premolar teeth restored with low shrinkable resin composite (in vitro study).

Labib LM, Nabih SM, Baroudi K - J Int Soc Prev Community Dent (2015 Nov-Dec)

Bottom Line: This study was done to investigate the effect of polymerization shrinkage stresses of two resin composite materials (Filtek Z350 and Filtek P90) on cuspal deflection of mesio-occluso-distal restoration.A significant increase in cuspal deflection of cavities restored with the methacrylate-based (Filtek Z350) compared with the silorane (P90) resin-based composites was obtained.The change in the organic matrix or materials formulation of the resin composite using silorane has a positive effect on controlling the cusp deflection.

View Article: PubMed Central - PubMed

Affiliation: Department of Restorative Dental Sciences, Alfarabi Colleges, Riyadh, Kingdom of Saudi Arabia.

ABSTRACT

Objectives: This study evaluated cuspal deflection in premolar teeth restored with low shrinkable resin composite.

Materials and methods: A total of 40 human premolars were used for cuspal deflection evaluation in this study. Each group was divided into four equal groups according to the type of resin composite and the adhesive used as follows: group A: Using low shrinkable resin composite (silorane) with its adhesive system; group B: Using low shrinkable composite (silorane) with G-bond; group C: Using Filtek Z350 composite with G-bond; and group D: Using Filtek Z350 composite with AdheSE. Cusp deflection was detected using Universal measuring microscope and laser horizontal metroscope.

Results: This study was done to investigate the effect of polymerization shrinkage stresses of two resin composite materials (Filtek Z350 and Filtek P90) on cuspal deflection of mesio-occluso-distal restoration. For this study, the extracted non-carious maxillary second premolars were selected. Forty teeth that showed no more than 5% variation in their dimensions were used. A significant increase in cuspal deflection of cavities restored with the methacrylate-based (Filtek Z350) compared with the silorane (P90) resin-based composites was obtained.

Conclusion: The change in the organic matrix or materials formulation of the resin composite using silorane has a positive effect on controlling the cusp deflection.

No MeSH data available.


Related in: MedlinePlus

MOD cavity
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Figure 1: MOD cavity

Mentions: Forty human premolars extracted for orthodontic reasons stored in normal saline were used. The selected teeth were placed 3 mm below the cementoenamel junction in an acrylic mold with dimensions of 15 mm internal diameter, 25 mm external diameter, and 20 mm height. The teeth set in the acrylic mold were fixed with a vice and a large Mesiooccluso distal cavity (MOD) cavity was prepared [Figure 1]. The mesio-distal proximal box was extended 0.5 mm bucco-lingually, and the width of the axial and gingival walls of the box was 1 mm. The width and depth of the pulpal wall of the MOD cavities was 2 × 3 mm. The reference point for cavity depth was the central groove. The reference point for measuring the specimens before and after the procedure was two metal tips (cut from dental needle C-K Ject, Korea, Queens Singapore) for each specimen (0.5 × 4 mm) that was fixed (using Clearfill SE Bond) horizontally and perpendicular to the long axis of the specimen at the cusp tip of the tooth, one buccally and the other lingually. The end of this tip was located beyond the buccal and lingual tooth contour by 2 mm in order to be attached to the microscope probes during cusp deflection measurement.


Evaluation of cuspal deflection in premolar teeth restored with low shrinkable resin composite (in vitro study).

Labib LM, Nabih SM, Baroudi K - J Int Soc Prev Community Dent (2015 Nov-Dec)

MOD cavity
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4697231&req=5

Figure 1: MOD cavity
Mentions: Forty human premolars extracted for orthodontic reasons stored in normal saline were used. The selected teeth were placed 3 mm below the cementoenamel junction in an acrylic mold with dimensions of 15 mm internal diameter, 25 mm external diameter, and 20 mm height. The teeth set in the acrylic mold were fixed with a vice and a large Mesiooccluso distal cavity (MOD) cavity was prepared [Figure 1]. The mesio-distal proximal box was extended 0.5 mm bucco-lingually, and the width of the axial and gingival walls of the box was 1 mm. The width and depth of the pulpal wall of the MOD cavities was 2 × 3 mm. The reference point for cavity depth was the central groove. The reference point for measuring the specimens before and after the procedure was two metal tips (cut from dental needle C-K Ject, Korea, Queens Singapore) for each specimen (0.5 × 4 mm) that was fixed (using Clearfill SE Bond) horizontally and perpendicular to the long axis of the specimen at the cusp tip of the tooth, one buccally and the other lingually. The end of this tip was located beyond the buccal and lingual tooth contour by 2 mm in order to be attached to the microscope probes during cusp deflection measurement.

Bottom Line: This study was done to investigate the effect of polymerization shrinkage stresses of two resin composite materials (Filtek Z350 and Filtek P90) on cuspal deflection of mesio-occluso-distal restoration.A significant increase in cuspal deflection of cavities restored with the methacrylate-based (Filtek Z350) compared with the silorane (P90) resin-based composites was obtained.The change in the organic matrix or materials formulation of the resin composite using silorane has a positive effect on controlling the cusp deflection.

View Article: PubMed Central - PubMed

Affiliation: Department of Restorative Dental Sciences, Alfarabi Colleges, Riyadh, Kingdom of Saudi Arabia.

ABSTRACT

Objectives: This study evaluated cuspal deflection in premolar teeth restored with low shrinkable resin composite.

Materials and methods: A total of 40 human premolars were used for cuspal deflection evaluation in this study. Each group was divided into four equal groups according to the type of resin composite and the adhesive used as follows: group A: Using low shrinkable resin composite (silorane) with its adhesive system; group B: Using low shrinkable composite (silorane) with G-bond; group C: Using Filtek Z350 composite with G-bond; and group D: Using Filtek Z350 composite with AdheSE. Cusp deflection was detected using Universal measuring microscope and laser horizontal metroscope.

Results: This study was done to investigate the effect of polymerization shrinkage stresses of two resin composite materials (Filtek Z350 and Filtek P90) on cuspal deflection of mesio-occluso-distal restoration. For this study, the extracted non-carious maxillary second premolars were selected. Forty teeth that showed no more than 5% variation in their dimensions were used. A significant increase in cuspal deflection of cavities restored with the methacrylate-based (Filtek Z350) compared with the silorane (P90) resin-based composites was obtained.

Conclusion: The change in the organic matrix or materials formulation of the resin composite using silorane has a positive effect on controlling the cusp deflection.

No MeSH data available.


Related in: MedlinePlus