Effect of Different Composite Modulation Protocols on the Conversion and Polymerization Stress Profile of Bulk-filled Resin Restorations

Overview

Journal Dent Mater

Specialty Dentistry

Date 2020 May 25

PMID 32446504

Citations 2

Authors

M C G Erhardt

M Goulart

R C Jacques

J A Rodrigues

C S Pfeifer

Affiliations

Soon will be listed here.

Abstract

Objective: The aim of this in vitro study was to test the effect of different composite modulation protocols (pre-heating, light-curing time and oligomer addition) for bulk filling techniques on resin polymerization stress, intra-pulpal temperature change and degree of conversion.

Methods: Class I cavities (4mm depth×5mm diameter) were prepared in 48 extracted third molars and divided in 6 groups. Restorations were completed with a single increment, according to the following groups: (1) Filtek Z250XT (room temperature - activated for 20s); (2) Filtek Z250XT (at room temperature - activated for 40s); (3) Filtek Z250XT (pre-heated at 68°C - activated for 20s); (4) Filtek Z250XT (pre-heated at 68°C - activated for 40s); (5) Filtek BulkFill (at room temperature - activated for 20s); (6) Filtek Z250XT (modified by the addition of a thio-urethane oligomer at room temperature - activated for 40s). Acoustic emission test was used as a real-time polymerization stress (PS) assessment. The intra-pulpal temperature change was recorded with a thermocouple and bottom/top degree of conversion (DC) measured by Raman spectroscopy. Data were analyzed with one-way ANOVA/Tukey's test (α=5%).

Results: Pre-heating the resin composite did not influence the intra-pulpal temperature (p=0.077). The thio-urethane-containing composite exhibited significantly less PS, due to a lower number of acoustic events. Groups with pre-heated composites did not result in significantly different PS. Filtek BulkFill and the thio-urethane experimental composite presented significantly higher DC.

Significance: Resin composite pre-heating was not able to reduce polymerization stress in direct restorations. However, thio-urethane addition to a resin composite could reduce the polymerization stress while improving the DC.

Citing Articles

Effect of preheating and curing lamp distance on the degree of conversion of four nanohybrid resins: An study.

Uribe-Hernandez L, Latorre-Correa F, Perea-Lowery L, Ardila C J Clin Exp Dent. 2024; 16(8):e975-e983.

PMID: 39281785 PMC: 11392445. DOI: 10.4317/jced.61769.

Comparison of the effect of preheating on the flexural strength of giomer and nanohybrid composite resin.

Kimyai S, Mashayekhi Z, Mohammadi N, Bahari M, Abed Kahnamouei M, Ebrahimi Chaharom M J Dent Res Dent Clin Dent Prospects. 2023; 16(3):159-163.

PMID: 36704183 PMC: 9871171. DOI: 10.34172/joddd.2022.027.

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