Composite vs. ionomer vs. mixed restoration of wedge-shaped dental cervical lesions: Marginal quality relative to eccentric occlusal loading

Autor(es)

Anhesini, Brunna Haddad ^[1] ; Landmayer, Karin ^[1] ; Salata Nahsan, Flavia Pardo ^[2] ; Pereira, Jose Carlos ^[3] ; Honorio, Heitor Marques ^[4] ; Francisconi-dos-Rios, Luciana Favaro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Operat Dent, Sch Dent, Ave Prof Lineu Prestes 2227, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Fed Sergipe, Dept Dent, Ctr Biol Sci & Hlth, Rua Claudio Batista S-N, BR-49060100 Aracaju, SE - Brazil

^[3] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Alameda Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

^[4] Univ Sao Paulo, Bauru Sch Dent, Dept Pediat Dent Orthodont & Publ Hlth, Alameda Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 91, p. 309-314, MAR 2019.
• Citações Web of Science: 0

Resumo

Dental cervical restorations may be impacted by resultants of occlusal loads that may have already contributed to the development of the lesion and should rely on materials' favorable properties to bear the stresses. The marginal quality of cervical restorations made with materials of different moduli of elasticity in essence, isolated, or in combination, was evaluated relative to eccentric occlusal loading. Cervical wedge-shaped cavities, prepared in extracted premolars, were restored with a composite resin (CR), a restorative ionomer (GIC), or the composite in combination with a lining ionomer (Mixed restoration: M). Half of the teeth in each group were subjected to eccentric occlusal loading (eol; 150 N / 10(6) cycles / 2.5 Hz; CReol / GICeol / Meol, n = 10), and the others were stored in 37 degrees C distilled water (Control: c; CRc / GICc / Mc, n = 10). A fluorescein-modified adhesive favored delimitation of formed gaps, which were evaluated by confocal laser scanning microscopy regarding their presence, location related to the cavity walls, and width and depth (mu m), at a 5% significance level. From a comprehensive perspective, neither the loading nor the materials were significantly associated with the qualitative response variables or exerted any influence over the quantitative variables. More specifically, the use of the different materials was significantly associated with the frequency of gaps exclusively when loading was applied (Chi-square test, p = 0.029, CR > M > GIC). Though the marginal quality of cervical restorations may not be influenced by eccentric occlusal loading or the use of different materials, even in association in general, the unfavorable aspects of the use of the composite may be relevant, particularly in face of the existence of eccentric occlusal loads. (AU)

• Processo FAPESP: 14/13444-7 - Qualidade marginal de restaurações cervicais, feitas com materiais de diferentes módulos de elasticidade, em pré-molares submetidos a carregamento oclusal excêntrico
• Beneficiário: Luciana Fávaro Francisconi dos Rios
• Modalidade de apoio: Auxílio à Pesquisa - Regular