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Stomatologija 2018; 20 (4): 119-124 101 KB

Influence of light-curing unit on the network structure and mechanical properties of model resin cements containing diphenyliodonium compared with a commercial reference

Ailla Carla Lancellotti¹, Luciano Souza Gonçalves², Adriano Fonseca Lima³, Alan Rodrigo Palialol¹, Simonides Consani¹

Summary

Objective. To evaluate the effects of dyphenyliodonium hexafluorophosphate (DPI) on crosslink density (CLD), flexural strength (FS), and flexural modulus (FM) of a light-cured experimental resin cement compared with a commercial dual-cured cement.

Materials and methods. Bis-GMA combined with TEGDMA (50-50%) was used as resin matrix. Silanated barium-aluminum-silica glass was used as inorganic filler. Camphorquinone (CQ) – 1 mol%, 2-(dimethylamino)ethyl methacrylate (DMAEMA) – 2 mol%, and two concentrations of DPI (0 or 0.5 mol%) were used as the photoinitiator system. Two light-curing units (LCUs) were used (a single-peak (Radii-Cal) and a polywave (Bluephase)). The CLD was indirectly assessed in a softening test by Knoop hardness indentation; FS and FM were measured by means of a three-point bending test.

Results. DPI positively influenced Knoop hardness when compared with experimental resin without DPI. The flexural strength of experimental cements was lower than that found with Variolink II. The crosslinking density (obtained by reduction of Knoop hardness) of cement with 0.5% DPI was similar to that of dual – cured Variolink II.

Conclusions. DPI showed an improvement in some of the properties tested but was inferior to the commercial dual-cured resin cement. The LCUs had no influence on the flexural strength of the resin cements.

Key words: diphenyliodonium hexafluorophosphate; dental materials; resin cement; polymers.

Received: 04 10 2017

Accepted for publishing: 25 12 2018

¹Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil

²Department of Conservative Dentistry, Federal University of Rio Grande do Sul-UFRGS, Porto Alegre, RS, Brazil.

³Dental Research Division, Paulista University, São Paulo, Brazil.

Address correspondence to Luciano Souza Gonçalves, Department of Conservative Dentistry, Federal University of Rio Grande do Sul-UFRGS, Rua Ramiro Barcelos, 2492- Santa Cecília Zip Code 90035003 – Porto Alegre, Brazil.

E-mail address: goncalves1976@yahoo.com.br



	Baltic Dental and Maxillofacial Journal

December, 2018, Vol. 20, No. 4 CONTENTS REVIEWS Efficacy of autologous platelet rich fibrin in bone augmentation and bone regeneration at extraction socket Bernard Blinstein, Stasys Bojarskas 111-118 SCIENTIFIC ARTICLES Influence of light-curing unit on the network structure and mechanical properties of model resin cements containing diphenyliodonium compared with a commercial reference Ailla Carla Lancellotti, Luciano Souza Gonçalves, Adriano Fonseca Lima, Alan Rodrigo Palialol, Simonides Consani 119-124 Clinical substantiation of the sparing and less invasive implant prosthetics of the edentulous lower jaw method Vladimir Trezubov, Yuri Parshin, Roman Rozov, Alexander Simonenko 125-129 Results of complex rehabilitation patients with temporomandibular joint disease and parafunction of masticatory muscles Roman Fadeyev, Vasiliy Parshin 130-138 The prevalence of facial and dentolabial parameters among students of the Faculty of Dentistry of Lithuanian University of Health Sciences Eglė Mickevičiūtė, Dovilė Bitinienė, Gediminas Žekonis, Jurgina Sakalauskienė, Juozas Žilinskas 139-144 © 2018 Stomatologija		Stomatologija 2018; 20 (4): 119-124 101 KB Influence of light-curing unit on the network structure and mechanical properties of model resin cements containing diphenyliodonium compared with a commercial reference Ailla Carla Lancellotti¹, Luciano Souza Gonçalves², Adriano Fonseca Lima³, Alan Rodrigo Palialol¹, Simonides Consani¹ Summary Objective. To evaluate the effects of dyphenyliodonium hexafluorophosphate (DPI) on crosslink density (CLD), flexural strength (FS), and flexural modulus (FM) of a light-cured experimental resin cement compared with a commercial dual-cured cement. Materials and methods. Bis-GMA combined with TEGDMA (50-50%) was used as resin matrix. Silanated barium-aluminum-silica glass was used as inorganic filler. Camphorquinone (CQ) – 1 mol%, 2-(dimethylamino)ethyl methacrylate (DMAEMA) – 2 mol%, and two concentrations of DPI (0 or 0.5 mol%) were used as the photoinitiator system. Two light-curing units (LCUs) were used (a single-peak (Radii-Cal) and a polywave (Bluephase)). The CLD was indirectly assessed in a softening test by Knoop hardness indentation; FS and FM were measured by means of a three-point bending test. Results. DPI positively influenced Knoop hardness when compared with experimental resin without DPI. The flexural strength of experimental cements was lower than that found with Variolink II. The crosslinking density (obtained by reduction of Knoop hardness) of cement with 0.5% DPI was similar to that of dual – cured Variolink II. Conclusions. DPI showed an improvement in some of the properties tested but was inferior to the commercial dual-cured resin cement. The LCUs had no influence on the flexural strength of the resin cements. Key words: diphenyliodonium hexafluorophosphate; dental materials; resin cement; polymers. Received: 04 10 2017 Accepted for publishing: 25 12 2018 ¹Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil ²Department of Conservative Dentistry, Federal University of Rio Grande do Sul-UFRGS, Porto Alegre, RS, Brazil. ³Dental Research Division, Paulista University, São Paulo, Brazil. Address correspondence to Luciano Souza Gonçalves, Department of Conservative Dentistry, Federal University of Rio Grande do Sul-UFRGS, Rua Ramiro Barcelos, 2492- Santa Cecília Zip Code 90035003 – Porto Alegre, Brazil. E-mail address: goncalves1976@yahoo.com.br