Violet LED with low concentration carbamide peroxide for dental bleaching: A case report.

The use of violet LED was recently introduced as a new alternative technique to perform tooth bleaching, associated or not with bleaching agents. This paper shows a tooth bleaching clinical case report performed in a 26-year-old woman, using a violet LED with 10% carbamide peroxide (CP). The tooth bleaching protocol was performed in 3 sessions. Fifteen irradiations using a violet light system (BMW, MMoptics, São Carlos, SP, Brazil) were done during 30 s (on) and 60 s (off) without bleaching gel, and more 5 irradiations associated to 10% CP. Upper and lower arches were irradiated separately. The total procedure time was 30 min. Subjective and objective color assessments were performed using Vitapan Classical shade guide and VITA Easyshade spectrophotometer, respectively. Dentin sensitivity was measured using a visual analogue scale. The use of violet LED associated to a low concentration carbamide peroxide successfully promoted tooth bleaching and no side effects i.e. dentin sensitivity during and post treatment was observed.

The influence of pH and chemical composition of beverages on color stability of a nanofilled composite resin.

Due to increasing consumer knowledge about the health benefits associated with anthocyanin-rich foods and beverages-such as acai and blueberry juices-the growing consumption of these products should be a source of concern for dentists. Since anthocyanins are colorants that can discolor teeth and restorations, the aim of this study was to investigate the staining effects of 2 anthocyanin-rich beverages on a nanofilled composite resin. Specimens were prepared, separated into 3 groups, and immersed in either artificial saliva or 1 of the 2 staining solutions (blueberry or acai juice) at 37°C for 7 days. The color stability of the resin was significantly affected by both the storage times (P < 0.001) and the solutions (P < 0.001). The blueberry juice, which had the lowest pH level, had the greatest effect on color stability and changes in lightness of the composite resin (ΔE* = 14.71; ΔL* = -8.25; P < 0.001), followed by acai juice (ΔE* = 10.21; ΔL* = -8.77; P < 0.001) and artificial saliva (ΔE* = 1.36; ΔL* = -0.44; P < 0.001). In the present study, a nanofilled composite resin did not exhibit color stability when exposed to acai and blueberry beverages.

Estudo retrospectivo de implantes osseointegrados instalados imediatamente após exodontias / Retrospective survival rates of 197 osseointegrated implants immediately placed after tooth extractions

Objetivo: avaliar retrospectivamente a sobrevivência de implantes osseointegrados instalados imediatamente após as exodontias, considerando a região, o tipo de prótese e a associação ou não aos biomateriais. Material e métodos: foram analisados 500 prontuários de pacientes tratados com implantes osseointegrados no período de 2004 a 2011. Resultados: apenas 100 prontuários (20%) eram de implantes imediatos. Os motivos para extração dentária incluíam cárie extensa, perda óssea e fratura radicular. Dos 197 implantes instalados imediatamente, 86 foram instalados na maxila com uma sobrevivência de 93,9% dos implantes instalados e 111 foram instalados na mandíbula com uma sobrevivência de 99,1% dos implantes instalados. O índice geral de sobrevivência dos implantes foi de 97,46% para todos os casos analisados. Os tipos de próteses utilizadas foram: prótese protocolo de Brånemark (36%), overdenture (5,6%), prótese parcial fixa (31%) e prótese unitária (27,4%). Em 33% dos casos, houve a necessidade de enxertos e/ou biomateriais. Os insucessos concentraram-se nas regiões posterior e anterior de maxila, e região posterior da mandíbula. Conclusão: pôde-se concluir que implantes imediatos, quando bem indicados, são uma excelente escolha. A região anterior da mandíbula, bem como as próteses totais fixas aparafusadas e overdentures, apresenta altos índices de sucesso quando associada ao implante imediato. A necessidade do uso de enxerto ósseo/biomaterial não interferiu nos resultados.

Objectives: to evaluate implant survival immediately placed after tooth extraction considering different sites, prosthodontic modalities, and the need for biomaterials. Material and methods: dental records of 500 patients treated with dental implants between 2004 and 2011 were screened. Results: only 200 records (20%) corresponded to immediate implants. Reasons for tooth extraction included extensive caries, bone loss, and root fractures. From the 197 immediate dental implants, 86 were placed in the maxilla with a survival rate of 93.9% and 111 in the mandible (survival rate of 99.1%). The overall survival rate was 97.46%. Prosthodontic modalities identified were: Brånemark classic complete denture screwed prostheses (36%), overdentures (5.6%), fixed partial denture (31%), and single-tooth prostheses (27.4%). Also, it was observed that in 33% of cases there was a need for the use of grafts and/or biomaterials. Conclusion: it can be concluded that, when correctly indicated, immediate implants are an excellent choice. The anterior mandibular region, screwed and overdenture-type prostheses presented higher success rates when associated to immediate implant placement. The need for bone graft/biomaterial does not affect the clinical results