Antimicrobial Photodynamic Therapy in the Approach of Complication After Implantation of Spiculated Polydioxanone Threads.

The present manuscript is a clinical case report in which antimicrobial photodynamic therapy (aPDT) - using a low-power laser (660 nm) associated with methylene blue photosensitizer (0.01%) - was considered for treating a case of complication after implantation of spiculated polydioxanone (PDO) threads, an aesthetic procedure worldwide performed in facial cosmetic non-surgical procedures. A 72-year-old female patient presented an infection in the face region where the PDO thread was implanted (mandible angle). After divulsion and local drainage, it was decided to associate aPDT using a low-level laser associated with a 0.01% methylene blue photosensitizer. Two sessions of aPDT were performed - on sequential days - and within 48 hours the region was dry and without signs of secretion. The use of aPDT seems to be a promising and effective option in cases of infections after implantation of PDO threads, consisting of a safe technique, of low execution complexity and without adverse effects.

Influência de um lubrificante no torque e no destorque de parafusos intermediários e protéticos em implantes de hexágono externo (AU) / The influence of a lubricant on torque and detorque values for abutment and prosthetic screws in an external hexagon dental implant system

O objetivo deste estudo foi investigar a influência de um lubrificante líquido nos valores de torque/destorque de parafusos de pilar e cilindro protético em um sistema de hexágono externo; 20 implantes (3,75 mm x 13 mm) foram usados neste estudo. O longo eixo de cada implante foi colocado em anéis de PVC e fixado com resina acrílica incolor autopolimerizável. Na primeira etapa, pilares tipo Microscone foram apertados com 32 Ncm. Quatro grupos com cinco amostras cada foram utilizados: G1 (sem lubrificante, sem reaperto), G2 (sem lubrificante, com reaperto), G3 (com lubrificante, sem reaperto) e G4 (com lubrificante, com reaperto). Na segunda etapa, cilindros protéticos de Ti e Co-Cr foram apertados até 10 Ncm. Quatro grupos com cinco amostras cada foram utilizados: G1 (sem lubrificante, cilindro Ti), G2 (sem lubrificante, cilindro Co-Cr), G3 (com lubrificante, cilindro Ti) e G4 (com lubrificante, cilindro Co-Cr). O teste Anova dois critérios (nível de significância 5%) foi usado em ambas as etapas para comparar os valores entre os grupos. Os testes Kruskal-Wallis e Tukey foram usados para investigar o efeito dos reapertos nos valores finais de destorque em cada etapa. Os resultados mostraram que a interação entre lubrificante e reaperto não foi significativa na primeira etapa, mas diferenças foram vistas da segunda à quinta repetição de aperto na primeira etapa. Da mesma forma, não houve interação entre lubrificante e cilindro e os reapertos sequenciais não foram significativos na segunda etapa. Concluiu-se que o uso de um lubrificante pode aumentar o torque nos parafusos protéticos, mas não nos parafusos dos pilares.

The purpose of this study was to investigate the influence of a liquid lubricant on abutment and prosthetic screw torque/detorque values in an external hex system. Twenty dental implants (3.75 mm-diameter x 13 mm-length) were used in this study. The implant long axis was embedded into PVC rings and secured with clear autopolymerizing acrylic resin. In the first phase, Microscone-like abutments were tightened to 32 Ncm. Four groups of five samples each were made: G1 (no lubricant, no retightening), G2 (no lubricant, retightening), G3 (lubricant, no retightening), and G4 (lubricant, retightening). In the second phase, Ti and Co-Cr prosthetic cylinders were tightened to 10 Ncm. Four groups of five samples each were made: G1 (no lubricant, Ti cylinder), G2 (no lubricant, Co-Cr cylinder), G3 (lubricant, Ti cylinder) and G4 (lubricant, Co-Cr cylinder). Two-way Anova tests (5% significance level) were performed in both phases to compare values among groups. Also, the Kruskal-Wallis and Tukey tests were performed to investigate the effect of repeated tightening on final detorque values in each phase. Results demonstrated that the interaction between lubricant and retightening was not statistically significant for the first phase, but differences were identified between the 2nd and 5th tightening repetition. In the same way, interaction between lubricant and cylinder did not demonstrate significant results, and no differences were seen among repeated tightening in the second phase. It can be concluded that the use of a lubricant can increase torque on prosthetic but not abutment screws.