Thermographic analysis of the effect of composite type, layering method, and curing light on the temperature rise of photo-cured composites in tooth cavities
Smile Dental Journal. 2017; 12 (2): 33-33
de En
| IMEMR
| ID: emr-189663
Bibliothèque responsable:
EMRO
Objective: The purpose of this study was to investigate temperature rise in the composite and dentin of a class I cavity in extracted human molars under different restoration conditions, including the use of different composite types, layering methods, and curing lights
Methods: Open occlusal cavities were prepared on 28 extracted human molars. A conventional [Filtek Z250] and a bulk-fill [Filtek Bulk Fill Posterior; BFP] composite were used to restore the preparations. BFP was incrementally layered or bulk-filled. Bulk-filled BFP was cured with two different lights, the Elipar S10 and the BeLite. Each layer was illuminated for 20s, while thermograms of the specimens were recorded for 100s using an infrared thermal camera. Temperature changes on the composite and dentin surfaces were obtained at points of interest [POI] pertaining to successive incremental distances of 0.75mm from the top of the cavity to the pulp. The polymerization kinetics of each composite was determined using photo-differential scanning calorimetry
Results: The greatest temperature rise was observed 0.75mm apical from the top of the cavity. All groups showed over 6°C maximum temperature rise [ATmax] at the pulpal side of the dentin. Upon curing, Z250 reached AT=5°C faster than BFP; however, ATmax of the two composites were comparable at any POI. Bulk filling showed greater ATmax than incremental filling at 0.75mm apical from the top and in the middle of the cavity. The Elipar SI 0 light generated faster temperature changes in the curing composite at all recorded positions throughout the depth of the cavity and greater ATmax in all POIs compared to BeLite
Methods: Open occlusal cavities were prepared on 28 extracted human molars. A conventional [Filtek Z250] and a bulk-fill [Filtek Bulk Fill Posterior; BFP] composite were used to restore the preparations. BFP was incrementally layered or bulk-filled. Bulk-filled BFP was cured with two different lights, the Elipar S10 and the BeLite. Each layer was illuminated for 20s, while thermograms of the specimens were recorded for 100s using an infrared thermal camera. Temperature changes on the composite and dentin surfaces were obtained at points of interest [POI] pertaining to successive incremental distances of 0.75mm from the top of the cavity to the pulp. The polymerization kinetics of each composite was determined using photo-differential scanning calorimetry
Results: The greatest temperature rise was observed 0.75mm apical from the top of the cavity. All groups showed over 6°C maximum temperature rise [ATmax] at the pulpal side of the dentin. Upon curing, Z250 reached AT=5°C faster than BFP; however, ATmax of the two composites were comparable at any POI. Bulk filling showed greater ATmax than incremental filling at 0.75mm apical from the top and in the middle of the cavity. The Elipar SI 0 light generated faster temperature changes in the curing composite at all recorded positions throughout the depth of the cavity and greater ATmax in all POIs compared to BeLite
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Indice:
IMEMR
Sujet Principal:
Température
/
Thermographie
/
Résines composites
/
Dentine
/
Lampes à photopolymériser dentaires
/
Molaire
langue:
En
Texte intégral:
Smile Dent. J.
Année:
2017