Erosive cola-based drinks affect the bonding to enamel surface: an in vitro study

Objective: This study aimed to assess the impact of in vitro erosion provoked by different cola-based drinks (Coke types), associated or not with toothbrushing, to bonding to enamel. Material and methods: Forty-six bovine enamel specimens were prepared and randomly assigned into seven groups (N=8): C- Control (neither eroded nor abraded), ERO-RC: 3x/1-minute immersion in Regular Coke (RC), ERO-LC: 3x/1-minute immersion in Light Coke (LC), ERO-ZC: 3x/1-minute immersion in Zero Coke (ZC) and three other eroded groups, subsequently abraded for 1-minute toothbrushing (EROAB-RC, EROAB-LC and EROAB-ZC, respectively). After challenges, they were stored overnight in artificial saliva for a total of 24 hours and restored with Adper Single Bond 2/Filtek Z350. Buildup coronal surfaces were cut in 1 mm2 -specimens and subjected to a microtensile test. Data were statistically analyzed by two-way ANOVA/Bonferroni tests (α=0.05). Failure modes were assessed by optical microscopy (X40). The Interface of the restorations were observed using Confocal Laser Scanning Microscopy (CLSM). Results: All tested cola-based drinks significantly reduced the bond strength, which was also observed in the analyses of interfaces. Toothbrushing did not have any impact on the bond strength. CLSM showed that except for Zero Coke, all eroded specimens resulted in irregular hybrid layer formation. Conclusions: All cola-based drinks reduced the bond strength. Different patterns of hybrid layers were obtained revealing their impact, except for ZC. .

Atypical lesion on soft palate: a curious case / Lesión atípica en el paladar blando: relato de caso

The aim of this work is to present a case of a 39-years-old man with a 2cm sized purple pedunculated tissue on the soft palate, next to upper right retromolar area, asymptomatic, with one day time evolution and vascular appearance. There was no trauma history or systemic diseases. Based on the clinical findings our previous diagnosis was traumatic granuloma, hemangioma or blood coagulum formation after local trauma. After one week, intraoral examination revealed absence of the lesion, which disappeared completely. This case illustrates that the absence of trauma history and atypical clinical characteristics can be a diagnostic defiance in the clinical routine.

El objetivo de este trabajo es presentar un caso de un hombre de 39 años de edad, con un tejido de 2 cm pediculado color púrpura en el paladar blando, junto al área retromolar superior derecha, asintomático, con un día de evolución y de aspecto vascular. No había historia de trauma o enfermedades sistémicas. Con base en los hallazgos clínicos nuestro diagnóstico previo fue granuloma traumático, hemangioma o la formación de coágulos sanguíneos, después de un traumatismo local. Luego de una semana, el examen intraoral reveló ausencia de la lesión, la que desapareció por completo. Este caso ilustra que la ausencia de historia de trauma y las características clínicas atípicas, puede ser un desafío diagnóstico en la rutina clínica.