A split-mouth randomized clinical trial of conventional and heavy flowable composites in class II restorations.
OBJECTIVE
The aim of this study was to evaluate the 2-year clinical performance of class II restorations made with a composite resin with two different viscosities.


METHODS
47 patients received two class II restorations (n=94), one made with GrandioSO (conventional viscosity - CV), and the other with GrandioSO Heavy Flow (flowable viscosity - FV), subjecting both materials to the same clinical conditions. The self-etching adhesive Futurabond M was used for all restorations. The composites were inserted using the incremental technique. The restorations were evaluated using the modified USPHS criteria according to the periods: baseline, 6 months, 1 year and 2 years after restorative procedures.


RESULTS
After 24 months, 40 patients attended the recall and 78 restorations were evaluated. In all periods, no secondary caries was observed. After 6 months, there were slightly overall changes of scores for most parameters. After 24 months, the higher number of changes from score Alfa to Bravo was observed for marginal discolouration (32.5% - CV and 39.5% - FV) and colour match (15% - CV and 31.6% - FV), followed by proximal contact (25% - CV and 23.7% - FV) and marginal adaptation (20% - CV and 21.1% - FV). For wear, surface texture and postoperative sensitivity the changes were very small. Just two restorations were lost during the 24-month follow up. Less than 5% of all restorations showed postoperative sensitivity. Chi-square test showed no significant differences between the two materials for all parameters analysed.


CONCLUSIONS
After 2 years of clinical service, no significant differences were observed between GrandioSO conventional and GrandioSO Heavy Flow for the parameters analysed. Both materials provided acceptable clinical behaviour in class II restorations.


CONCLUSIONS
This study presents the possibility of using a flowable composite with high filler content, for performing class II restorations.
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil. Electronic address: carlosrgt@fosjc.unesp.br.
Carlos
C
Rocha Gomes Torres
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Heleine Maria Chagas
HM
Rêgo
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Letícia C C Costa
LC
Perote
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Luciana F Thives F
LF
Santos
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Maria Beatriz Beber
MB
Kamozaki
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Natália Cortez
NC
Gutierrez
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Rebeca
R
Di Nicoló
Department of Restorative Dentistry, São José dos Campos School of Dentistry, São Paulo State University - UNESP, Av. Eng. Francisco José Longo, 777 São José dos Campos, SP, Brazil.
Alessandra Bühler
AB
Borges
D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003731:Dental Caries / Q000628:therapy; D003736:Dental Cavity Lining / Q000379:methods; D003737:Dental Cavity Preparation / Q000145:classification* / Q000592:standards; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear / Q000145:classification; D003793:Dental Restoration, Permanent / Q000145:classification* / Q000592:standards; D003807:Dentin Sensitivity / Q000145:classification; D005500:Follow-Up Studies; D005899:Glass Ionomer Cements / Q000737:chemistry; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D012008:Recurrence; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D016896:Treatment Outcome; D014783:Viscosity
D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; C509998:Grandio; D008689:Methacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; C074277:ethoxylated bis-phenol A dimethacrylate; D017438:Bisphenol A-Glycidyl Methacrylate
Clinical trial; Composite resin; Dental restorations; Flowable; USPHS criteria