The effect of a light source with reduced irradiance on the marginal seal in class V cavities

• Published in: Stomatološki glasnik Srbije Vol. 55; no. 4; pp. 229 - 237
• Main Authors: Gajic, Natasa, Kojic, Zeljka, Djeri, Aleksandra, Arbutina, Radmila, Trnic, Zorica
• Format: Journal Article
• Language: English
• Published: Serbian Medical Society - Dental Section, Belgrade 2008
• Subjects: intact and carious teeth; LED; microgap; polymerisation
• ISSN: 0039-1743; 1452-3701
• DOI: 10.2298/SGS0804229G

Introduction: During composite polymerisation, material contraction occurs and leads to microgap formation. Various light sources are used in everyday dental practice for the polymerisation of composite restorations: conventional halogen, xenon, LED light curing units (LCUs) and argon lasers. Aim: The aim of this study was to analyze the effect of an LED LCU with reduced irradiance on the marginal seal of different composite restorations. Material and Method: The study was conducted on 40 extracted human teeth (intact and carious). Class V cavities were prepared on all teeth. Cavities were filled with either Filtek Supreme -3M (20 teeth) or Luksogal - Galenika (20 teeth) and polymerisation was done using an LED source with reduced irradiance (90 mW/cm2). Microleakage was tested using the dye penetration method with silver nitrate. Dye penetration was assessed using a stereo loupe with a microscale and x6 magnification. Results: The obtained results suggested that greater dye penetration occurred in samples restored with Luksogal. There was a statistically significant difference between occlusal (27.00) and gingival (36.90) margins (p<0.05). Dye penetration was observed in all intact and carious teeth restored with Filtek Supreme on both gingival and occlusal margins. A statistically significant difference was observed between gingival (22.90) and occlusal (15.50) margins (p<0.01). Conclusion: Microgaps were observed in all teeth irrespective of the type of composite material used for restoration. Uvod: U toku polimerizacije kompozita javlja se kontrakcija materijala pri cemu dolazi do pojave mikropukotine. U svakodnevnoj stomatoloskoj praksi danas se koriste razlicite vrste svjetlosnih izvora za polimerizaciju kompozitnih ispuna: konvencionalne halogene lampe, ksenonske lampe, LED izvori, te argonski laseri. Cilj: Cilj ovog rada bio je da se utvrdi uticaj LED svjetlosnog izvora sa smanjenom iradijansom na kvalitet rubnog zaptivanja razlicitih kompozitnih ispuna. Materijal i metod: Ispitivanja su obavljena na 40 ekstrahovanih zuba humanog porijekla (intaktni i kariozni zubi). Kod svih zuba su uradjene preparacije kaviteta V klase. Polimerizacija kompozita uradjena je LED diodom sa smanjenom iradijansom (90 mW/cm2), a kaviteti su ispunjeni primjenom dvije vrste kompozita: Filtek Supreme-3M (20 zuba) i Luksogal-Galenika (20 zuba). Ispitivanje mikropropustljivosti obavljeno je metodom bojenih rastvora u rastvoru srebro-nitrata. Pomocu stereolupe sa mikroskopskim razmjerom u okularu i uvecanjem od sest puta, vrseno je ocitavanje rezultata. Rezultati: Dobijeni rezultati su pokazali da je veci linearni prodor boje uocen kod uzoraka restaurisanih Luksogalkompozitnim materijalom. Postoji statisticka znacajnost u prodoru boje na okluzalnom (27,00) i gingivalnom (36,90) dijelu kaviteta (p_0,05). Prodor boje je uocen kod svih intaktnih i karijesnih zuba restaurisanih kompozitnim materijalom Filtek Suprime i na gingivalnom i na okluzalnom dijelu kaviteta. Uocena je statisticki znacajna razlika izmedju prodora boje na gingivalnom (22,90) i okluzalnom (15,50) dijelu kaviteta (p_0,01). Zakljucak: Postojanje mikropukotine je registrovano na svim zubima, bez obzira na vrstu kompozita koji je koristen.