Can the Use of a Warm-Air Stream for Solvent Evaporation Lead to a Dangerous Temperature Increase During Dentin Hybridization?

PURPOSE: To analyze the effect of a warm-air stream for solvent evaporation on the temperature rise in the pulp chamber during dentin hybridization. MATERIALS AND METHODS: Dentin disks with thicknesses of 0.5, 1.0 and 1.5 mm were obtained from extracted human molars. A model tooth was set up with the dentin disks between a molar with an exposed pulp chamber and a crown with an occlusal preparation. A K-type thermocouple connected to a digital thermometer was placed in the molar root until it entered the pulp chamber and made contact with the dentin disks. After 10 s of adhesive application, solvent evaporation was performed for 10, 20, 30, and 40 s and the increase in temperature was monitored for 200 s after the warm-air stream began. RESULTS: The temperature increase was significantly influenced by the thickness of the dentin disks (0.5 mm = 1.0 mm > 1.5 mm). With respect to the duration of the warm-air stream, the temperature increase was as follows: 10 s < 20 s < 30 s < 40 s (p < 0.05). The highest temperature was found after 40 s with dentin disks that were 0.5 mm (16.6°C) and 1.0 mm (15.8°C) thick, whereas the lowest temperature increase occurred after 10 s with a dentin disk that was 1.5 mm thick (4.1°C) (p < 0.05). CONCLUSION: The temperature in the pulp chamber was strongly influenced by the dentin thickness and the duration of the warm-air stream. Thinner dentin and a longer duration of the warm-air stream both lead to a greater temperature increase in the pulp chamber.

Candida spp. In Linear gingival erythema lesions in HIV-Infected children: report of six cases

Introduction: Linear gingival erythema (LGE), formally referred to as HIV-gingivitis, is the most common form of HIV-associated periodontal disease in HIV-infected individuals These lesions have been recently evaluated as a possible form of erythematous oral candidosis, mainly caused by Candida albicans. Other species such as C. tropicalis, C. stellatoidea, C. krusei, C. parapsilosis, C. glabrata and C. Dubliniensis, have also been identified in some HIV-infected subjects. Objective: This case report reveals the presence of typical LGE lesions in six HIV-infected children, and also investigates the etiologic agent through microbiological exams and correlates this oral manifestation with the patients' systemic conditions. Case report: Microbiological analyses showed growth for Candida spp in all patients; all of whom had severe immunosuppression. However, the regression of lesions was noted after antifungal medication. Conclusion: The presence of LGE in pediatric patients with AIDS may be a predictive marker in the progression of AIDS or it may be the first clinical manifestation of HIV infection in children. Hence it is important for dentists to be aware of such lesions.

Introdução: O eritema gengival linear (LGE), normalmente referido como gengivite do HIV, é a forma mais comum de doença periodontal presente em indivíduos infectados pelo HIV. Recentemente, estas lesões foram consideradas como uma possível forma de candidíase oral eritematosa causada por Candida. Albicans . Outras espécies, como C. tropicalis, C. stellatoidea,C. krusei, C. parapsilosis, C. glabrata e C. Dubliniensis também foram identificadas em indivíduos infectados pelo HIV associadas ao LGE. Objetivo: O presente artigo mostra a presença de lesões típicas de LGE em seis crianças infectadas pelo HIV e também investigou o agente etiológico das lesões orais através de exames microbiológicos, correlacionando o LGE com as condições sistêmicas dos pacientes. Case report: Análises microbiológicas mostraram crescimento positivo para Candida spp em todos os pacientes, os quais possuiam imunossupressão grave. Adicionalmente, a regressão total das lesões foi observada após medicação tópica antifúngica. Conclusão: A presença de LGE em pacientes pediátricos com AIDS pode ser um marcador preditivo da progressão.