RESUMEN
Background@#The purpose of the present study was to determine how long superior screws alone or in combination with posterior placement of metaglene screws protruding and penetrating into the scapular spine in reverse total shoulder arthroplasty affect the strength of thescapular spine in a fresh cadaveric scapular model. @*Methods@#Seven fresh cadaver scapulas were allocated to the control group (short posterior and superior screws) and seven scapulars to thestudy group (spine base fixation with a four long screws, three with both long superior and long posterior screws). @*Results@#The failure load was lower in the spine fixation group (long screw, 869 N vs. short screw, 1,123 N); however, this difference did notreach statistical significance (p>0.05). All outside-in long superior or superior plus posterior screws failed due to scapular spine base fracture; failures in the short screw group were due to acromion fracture. An additional posterior outside-in screw failed to significantly decrease the failure load of the acromion spine. @*Conclusions@#The present study highlights the significance of preventing a cortical breach or an outside-in configuration when a superioror posterior screw is inserted into the scapular spine base.
RESUMEN
Background@#The purpose of the present study was to determine how long superior screws alone or in combination with posterior placement of metaglene screws protruding and penetrating into the scapular spine in reverse total shoulder arthroplasty affect the strength of thescapular spine in a fresh cadaveric scapular model. @*Methods@#Seven fresh cadaver scapulas were allocated to the control group (short posterior and superior screws) and seven scapulars to thestudy group (spine base fixation with a four long screws, three with both long superior and long posterior screws). @*Results@#The failure load was lower in the spine fixation group (long screw, 869 N vs. short screw, 1,123 N); however, this difference did notreach statistical significance (p>0.05). All outside-in long superior or superior plus posterior screws failed due to scapular spine base fracture; failures in the short screw group were due to acromion fracture. An additional posterior outside-in screw failed to significantly decrease the failure load of the acromion spine. @*Conclusions@#The present study highlights the significance of preventing a cortical breach or an outside-in configuration when a superioror posterior screw is inserted into the scapular spine base.
RESUMEN
Abstract Objective To evaluate the effect of final irrigation of root canals with NaOCl solution at different temperatures on postoperative pain level and antimicrobial activity. Methodology 45 patients were randomly divided into three groups using a web program according to the irrigation selected: NaOCl 2ºC, NaOCl 25ºC and NaOCl 45ºC. First root canal samples were collected before treatment (S1). After chemo-mechanical preparation, final irrigation was performed with the selected irrigant (NaOCl 2ºC, NaOCl 25ºC and NaOCl 45ºC) and second samples were collected (S2). Samples were subjected to quantitative real-time polymerase chain reaction to evaluate the levels of total bacteria. The root canal treatments were completed and the participants were given instructions to record postoperative pain levels at 24, 48 and 72 hours, 5 days and 1 week after treatment using a visual analog scale (VAS). Results The reduction in the number of total bacterial cell equivalents from S1 to S2 was statistically significant in all groups (p<0.001). The NaOCl 2˚C group reported significantly less postoperative pain than the NaOCl 45˚C group (p<0.05). Postoperative analgesic intake was significantly higher in the NaOCl 45˚C group than in the NaOCl 2˚C group (p<0.05). Conclusion We conclude that final irrigation with NaOCl at different temperatures results in similar antibacterial effectiveness. Final irrigation with cold NaOCl (2˚C) is better than NaOCl 45˚C when comparing postoperative pain levels.