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ABSTRACT Objective This study evaluated the shear bond strength (SBS) of lithium disilicate glass (LDG) ceramic bonded to a zirconia (Y-TZP), using different cementation strategies. Methods LDG ceramic cylinders were cemented to Y-TZP structure according to the following adhesive system (AS)/resin cement (RC) (n = 15): U- self-adhesive dual-cure RC; AMBAR- AS containing phosphate monomers (PM) + dual-cure RC; group SBU: PM+Silane/AS + light-cure RC; group ALLB: PM/AS + dual-cure RC. Specimens were subjected to SBS in a universal testing machine (0.5 mm/min). Data (MPa) were subjected to one-way ANOVA and Tukey's test (α = 0,05). Results The groups SBU and ALLB had significantly higher SBS than those provided by the group U, in which the lowest values were observed. For the AMBAR group, intermediate SBS values were found, which did not differ significantly from the values observed in the other groups. Conclusion Regardless of resins cement, the use of adhesives containing phosphate monomers provided superior bond strength than self-adhesive cement.
RESUMO Objetivo Avaliar a resistência de união por cisalhamento (RU) de uma cerâmica de dissilicato de lítio (CDL) à zircônia (Y-TZP) utilizando diferentes estratégias de cimentação. Métodos Cilindros de CDL foram cimentados à estrutura de Y-TZP de acordo com os seguintes sistemas adesivos (SA)/ Cimentos resinosos (CR) (n=15): U: CR autoadesivo de cura dual; AMBAR: SA contendo monômeros fosfatados (MF) + CR convencional de cura dual; SBU: SA contendo MF/silano + RC de cura fotoativada; ALLB: SA contendo MF/silano + CR de cura dual. Os corpos de prova foram submetidos ao teste de cisalhamento em máquina universal de ensaios (0.5 mm/min). Os dados (MPa) foram submetidos a ANOVA a um critério e teste de Tukey (α = 0,05). Resultados Observou-se que os grupos SBU e ALLB promoveram valores de RU estatisticamente superiores ao grupo U, no qual observou-se a menor média de RU. Para o grupo AMBAR, valores de RU intermediários foram encontrados, os quais não diferiram dos demais grupos. Conclusão Independente do cimento resinoso, o uso de sistemas adesivos contendo monômeros fosfatados em sua composição promoveram resistência de união superior ao cimento resinoso autoadesivo.
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The tooth rotation consists of a dental anomaly of position, in which there is a displacement of the tooth within the alveolar bone around its longitudinal axis. This study proposes to describe a rare condition of rotation of 180° in a lower right central incisor, no history of trauma or any other dental dental anomaly in the oral cavity. Thus, we sought to gain a deeper understanding of this anatomical variation, which can cause occlusal problems in patients, to alert the dental surgeons, so they are prepared to carry out a careful planning of the teeth involved.