Validation of the Spanish Version of the PURE-4 Questionnaire for the Early Detection of Psoriatic Arthritis in Psoriatic Patients. / Validación de la versión española del cuestionario PURE-4 para la detección precoz de la artritis psoriásica en pacientes con psoriasis.

BACKGROUND AND OBJECTIVE: Psoriasis often precedes the onset of psoriatic arthritis (PsA), so dermatologists often face the challenge of early identifying signs of PsA in patients with psoriasis. Our aim was to validate the Spanish version of the PURE-4 questionnaire as a screening tool for PsA, evaluate its performance in terms of sensitivity, specificity, feasibility, reliability, and build validity. METHODS: This was a cross-sectional, observational, multicenter trial of adult patients with psoriasis. Initially, patients were assessed by a dermatologist and completed 2 self-administered versions (in print and online) of the PURE-4 questionnaire. Afterwards, the rheumatologist, blinded to the PURE-4 results, assessed the presence/absence of PsA, being the reference to determine the performance of the PURE-4 questionnaire. RESULTS: A total of 268 patients were included (115 [42.9%] women; mean age, 47.1±12.6). The prevalence of PsA according to rheumatologist diagnosis was 12.7% (34 patients). The mean PURE-4 score for patients with psoriasis diagnosed with PsA was 2.3±1.1, and 1.3±1.3 for patients without PsA (P<.001). The cutoff value ≥2 demonstrated the best performance for detecting PsA, with a negative predictive value of 95.1% (95% confidence interval, 90.3-97.6). CONCLUSIONS: The PURE-4 questionnaire demonstrated good performance in detecting PsA, with an optimal cutoff point ≥2. This simple tool could facilitate early referral of patients to the rheumatology unit.

Tratamiento de la eritrodisestesia palmoplantar con una fórmula magistral de urea 20% + triamcinolona acetónido 0, 2% + lidocaína 2% / Treatment of palmoplantar erythrodysesthesia with a compounding of urea 20% + triamcinolone acetonide 0.2% + lidocaine 2%

La eritrodisestesia palmoplantar es una reacción adversa cútanea secundaria al tratamiento quimioterápico y relativamente frecuente. Cursa con enrojecimiento, hinchazón, ardor y sensibilidad; en los casos más graves produce descamación de la piel, ampollas y dolor intenso afectando a la deambulación y calidad de vida de los pacientes.Se presenta el caso de una mujer a tratamiento con capecitabina que en el tercer ciclo de tratamiento presenta eritrodisestesia palmoplantar con empeoramiento en el octavo ciclo. El Servicio de Dermatología solicita al Servicio de Farmacia la elaboración de una crema de alantoína 6%. Desde el Servicio de Farmacia se propone la adición de un corticoide por sus propiedades inflamatorias y un anestésico para alivio del dolor. A los 7 días de inicio de tratamiento la paciente describe una leve mejoría, pero continúa con descamación en los pies; por lo que el Servicio de Farmacia propone cambio de alantoína por urea e incorporar un corticoide más potente. Se mantiene la lidocaína y se cambia la base de O/W a W/O para favorecer la penetración de los fármacos en la zona palmar y plantar.La composición final de la fórmula magistral es (100 g): urea 20 g, lidocaína 2 g, acetónido de triamcinolona 0,2 g, glicerina 3 g, alantoína 1 g, aceite de argán 5 g, vaselina filante 9 g, agua conservante 35 ml y base de absorción PR W/O 25 g.Tras 45 días de tratamiento con la fórmula propuesta, la paciente presenta muy buena evolución y mejoría desde el punto de vista sintomático. Además, ha mejorado notablemente la deambulación haciendo vida normal. (AU)

Palmoplantar erythrodysesthesia is a relatively frequent adverse cutaneous reaction secondary to chemotherapy treatment. It produces redness, swelling, burning and sensitivity. In the most severe cases it produces skin desquamation, blisters and intense pain affecting patients’ ambulation and quality of life.We present the case of a woman on a capecitabine treatment who during the third cycle of treatment presents palmoplantar erythrodysesthesia, worsening during the eighth cycle. The Dermatology Department requested the Pharmacy Department the elaboration of a 6% allantoin cream. The Pharmacy Department proposes the addition of a corticosteroid, due to its anti-inflammatory properties, and the addition of an anesthetic for pain relief. 7 days after having started the treatment, the patient describes a slight improvement, but she still presents feet desquamation. Therefore, the Pharmacy Department proposed changing allantoin for urea and introducing a stronger corticosteroid. Lidocaine is maintained and the base is changed from O/W to W/O to favor the penetration of the drugs in the palmar and plantar areas.The final composition of the compounding is (100 g): urea 20 g, lidocaine 2 g, triamcinolone acetonide 0.2 g, glycerin 3 g, allantoin 1 g, argan oil 5 g, stringy vaseline 9 g, preservative water 35 mL and PR W/O absorption base 25 g.Afer 45 days of treatment with the proposed compounding, the patient shows a very good evolution and improvement from the symptomatic point of view. Moreover, she has significantly improved the ambulation and can return to normal life. (AU)

Formulación magistral en pacientes con genodermatosis. Impacto en la calidad de vida: un estudio transversal / Effect of Drug Compounding on Quality of Life in Patients With Genodermatoses: A Cross-Sectional Study

Introducción El abordaje terapéutico de las manifestaciones cutáneas de las enfermedades raras es complejo. El objetivo principal de este trabajo consistió en determinar el impacto de la formulación magistral de dispensación hospitalaria en la calidad de vida de los pacientes con genodermatosis. Material y métodos Se diseñó un estudio descriptivo transversal. Se incluyeron pacientes con genodermatosis que recibieron tratamientos tópicos elaborados y dispensados por el Servicio de Farmacia Hospitalaria del Complejo Hospitalario Universitario de Pontevedra. Se recogieron datos demográficos, cuestionarios generales y específicos sobre la calidad de vida, y cuestionarios que evaluaban los tratamientos administrados y la adherencia terapéutica. Resultados Se incluyeron 9 pacientes. Se observó que, tras la terapia con fórmulas magistrales, hubo una reducción estadísticamente significativa del impacto en la calidad de vida de los pacientes. La satisfacción con los productos fue 2,8 sobre 25 (siendo 0 la mejor puntuación). La adherencia terapéutica superó el 89%. Conclusiones La formulación magistral permite el acceso a medicamentos huérfanos y no comercializados para numerosas enfermedades raras. Su impacto en la calidad de vida de los pacientes afectos de estas enfermedades ha sido escasamente estudiado. En la serie de pacientes que se presenta, la elaboración y dispensación hospitalaria de fórmulas magistrales específicas conllevó efectos positivos en su calidad de vida. Este estudio inicial ha derivado en otro trabajo multicéntrico, centrado en las ictiosis, donde previsiblemente aumentará el número de pacientes a incluir y permitirá confirmar nuestros resultados (AU)

Background Cutaneous manifestations are complicated to treat in rare diseases. The main aim of this study was to analyze the impact of compounded drugs prepared by hospital pharmacists on the quality of life of patients with genodermatoses. Material and methods We undertook a cross-sectional study of patients with genodermatoses treated with topical medications compounded and dispensed by the pharmacy at Complejo Hospitalario Universitario in Pontevedra, Spain. We collected demographic data and answers to questionnaires examining generic and disease-specific quality of life, treatment satisfaction, and treatment adherence.Results Nine patients were included. We observed a significant improvement in health-related quality of life following treatment with compounded drugs. Satisfaction with the topical medications was 2.8 on a scale of 0 (greatest satisfaction) to 25. Treatment adherence was 59%. Conclusions Drug compounding facilitates access to orphan drugs that are not available for many rare diseases. Few studies, however, have analyzed impact on quality of life in this setting. In this series of patients with genodermatoses, topical medications compounded and dispensed by a hospital pharmacy improved health-related quality of life. This preliminary study has given rise to a multicenter study of compounding for ichthyosis. We expect that analysis of a larger sample will confirm our findings (AU)

[Translated article] Effect of Drug Compounding on Quality of Life in Patients With Genodermatoses: A Cross-Sectional Study / Formulación magistral en pacientes con genodermatosis. Impacto en la calidad de vida: un estudio transversal

Background Cutaneous manifestations are complicated to treat in rare diseases. The main aim of this study was to analyze the impact of compounded drugs prepared by hospital pharmacists on the quality of life of patients with genodermatoses. Material and methods We undertook a cross-sectional study of patients with genodermatoses treated with topical medications compounded and dispensed by the pharmacy at Complejo Hospitalario Universitario in Pontevedra, Spain. We collected demographic data and answers to questionnaires examining generic and disease-specific quality of life, treatment satisfaction, and treatment adherence.Results Nine patients were included. We observed a significant improvement in health-related quality of life following treatment with compounded drugs. Satisfaction with the topical medications was 2.8 on a scale of 0 (greatest satisfaction) to 25. Treatment adherence was 59%. Conclusions Drug compounding facilitates access to orphan drugs that are not available for many rare diseases. Few studies, however, have analyzed impact on quality of life in this setting. In this series of patients with genodermatoses, topical medications compounded and dispensed by a hospital pharmacy improved health-related quality of life. This preliminary study has given rise to a multicenter study of compounding for ichthyosis. We expect that analysis of a larger sample will confirm our findings (AU)

Introducción El abordaje terapéutico de las manifestaciones cutáneas de las enfermedades raras es complejo. El objetivo principal de este trabajo consistió en determinar el impacto de la formulación magistral de dispensación hospitalaria en la calidad de vida de los pacientes con genodermatosis. Material y métodos Se diseñó un estudio descriptivo transversal. Se incluyeron pacientes con genodermatosis que recibieron tratamientos tópicos elaborados y dispensados por el Servicio de Farmacia Hospitalaria del Complejo Hospitalario Universitario de Pontevedra. Se recogieron datos demográficos, cuestionarios generales y específicos sobre la calidad de vida, y cuestionarios que evaluaban los tratamientos administrados y la adherencia terapéutica. Resultados Se incluyeron 9 pacientes. Se observó que, tras la terapia con fórmulas magistrales, hubo una reducción estadísticamente significativa del impacto en la calidad de vida de los pacientes. La satisfacción con los productos fue 2,8 sobre 25 (siendo 0 la mejor puntuación). La adherencia terapéutica superó el 89%. Conclusiones La formulación magistral permite el acceso a medicamentos huérfanos y no comercializados para numerosas enfermedades raras. Su impacto en la calidad de vida de los pacientes afectos de estas enfermedades ha sido escasamente estudiado. En la serie de pacientes que se presenta, la elaboración y dispensación hospitalaria de fórmulas magistrales específicas conllevó efectos positivos en su calidad de vida. Este estudio inicial ha derivado en otro trabajo multicéntrico, centrado en las ictiosis, donde previsiblemente aumentará el número de pacientes a incluir y permitirá confirmar nuestros resultados (AU)

Effect of Drug Compounding on Quality of Life in Patients With Genodermatoses: A Cross-Sectional Study. / Formulación magistral en pacientes con genodermatosis. Impacto en la calidad de vida: un estudio transversal.

BACKGROUND: Cutaneous manifestations are complicated to treat in rare diseases. The main aim of this study was to analyze the impact of compounded drugs prepared by hospital pharmacists on the quality of life of patients with genodermatoses. MATERIAL AND METHODS: We undertook a cross-sectional study of patients with genodermatoses treated with topical medications compounded and dispensed by the pharmacy at Complejo Hospitalario Universitario in Pontevedra, Spain. We collected demographic data and answers to questionnaires examining generic and disease-specific quality of life, treatment satisfaction, and treatment adherence. RESULTS: Nine patients were included. We observed a significant improvement in health-related quality of life following treatment with compounded drugs. Satisfaction with the topical medications was 2.8 on a scale of 0 (greatest satisfaction) to 25. Treatment adherence was 59%. CONCLUSIONS: Drug compounding facilitates access to orphan drugs that are not available for many rare diseases. Few studies, however, have analyzed impact on quality of life in this setting. In this series of patients with genodermatoses, topical medications compounded and dispensed by a hospital pharmacy improved health-related quality of life. This preliminary study has given rise to a multicenter study of compounding for ichthyosis. We expect that analysis of a larger sample will confirm our findings.

Efectividad y seguridad de pirfenidona en la fibrosis pulmonar idiopática / Effectiveness and safety of pirfenidone in idiopathic pulmonary fibrosis

Objetivo: La fibrosis pulmonar idiopática (FPI) es una enfermedad caracterizada por una cicatrización progresiva de los pulmones provocando su deterioro a largo plazo. Su diagnóstico requiere la existencia del patrón radiológico denominado neumonía intersticial usual (NIU). Su prevalencia es mayor en hombres. Entre los síntomas principales encontramos la disnea y la tos. En la actualidad, no existe una cura conocida, sin embargo, existen diversos tratamientos antifibróticos enfocados a disminuir la progresión de esta patología y prolongar la supervivencia. El objetivo es evaluar la efectividad y seguridad de la pirfenidona en esta enfermedad.Métodos: Estudio descriptivo retrospectivo entre enero de 2016 y diciembre de 2019. Se incluyeron 40 pacientes diagnosticados de fibrosis pulmonar idiopática que iniciaron tratamiento con pirfenidona.Resultados: Los parámetros de función pulmonar mostraron valores mantenidos durante el periodo de estudio. Hubo mejoría de la tos. Las reacciones adversas más comunes fueron alteraciones gastrointestinales y cutáneas.Conclusión: El tratamiento con pirfenidona requiere de un riguroso seguimiento por el porcentaje de pacientes que abandonó esta terapia. (AU)

Objective: Idiopathic pulmonary fibrosis (IPF) is a disease characterized by progressive scarring of the lungs causing their long-term deterioration. Its diagnosis requires the existence of the radiological pattern called usual interstitial pneumonia (UIP). Its prevalence is higher in men. Among the main symptoms, we find dyspnea and cough. At present, there is no known cure, however, there are various antifibrotic treatments focused on slowing the progression of this pathology and prolonging survival. The aim of this study was to evaluate the effectiveness and safety of pirfenidone in this disease.Methods: Retrospective descriptive study from January 2016 to December 2019. The study included 40 patients diagnosed with idiopathic pulmonary fibrosis who started treatment with pirfenidone.Results: The pulmonary function parameters showed values that were maintained during the study period. There was an improvement in the cough. The most common adverse reactions were gastrointestinal and skin disorders.Conclusion: Pirfenidone treatment requires rigorous monitoring due to the percentage of patients who abandoned this therapy. (AU)

Impact of untreated dental caries and dental pain on sadness related to oral health of Brazilian children.

PURPOSE: Children should feel sad when they believe that a negative outcome is permanent. The sadness that an oral problem might bring tends to contribute to children's loneliness and increase the social stress levels. The aim of this study was to evaluate the impact of untreated dental caries, dental pain, malocclusion, and traumatic dental injury on prevalence of sadness related to oral health among Brazilian children. METHODS: This cross-sectional study was carried out with 397 children aged 8-10 years randomly selected from public and private schools in Diamantina, Brazil. The Brazilian version of the CPQ8-10 was applied. Sadness was collected through the question, "In the last month how often did you feel sad because of your teeth or mouth?" and dental pain through the question, "In the last month, how many times have you had pain in your teeth?" One calibrated examiner (Kappa value intra examiner: 0.77-0.91; Kappa value inter examiner: 0.80-1.00) performed the exam for dental caries (DMFT), malocclusion (DAI), and dental trauma (O'Brien). Parents answered questions addressing socioeconomic issues. Descriptive analyses, Chi-square test, and hierarchical Poisson regression models were performed (IC 95%; p < 0.05)." RESULTS: The prevalence of sadness related to oral health was 30.5% (n = 121). Sadness related to oral health was associated with untreated dental caries (PR: 1.46; 95% CI 1.32-2.46; p = 0.001 ) and dental pain (PR: 2.91; 95% CI 2.00-4.22; p < 0.001). Other clinical variables analyzed (traumatic dental injury and malocclusion) were not significantly associated with sadness related to oral health. CONCLUSIONS: Children with untreated dental caries and dental pain presented a higher report of sadness related to oral health.

Critically ill COVID-19 patients attended by anesthesiologists in northwestern Spain: a multicenter prospective observational study. / Pacientes críticos COVID-19 atendidos por anestesiólogos en el Noroeste de España: estudio multicéntrico, prospectivo, observacional.

BACKGROUND AND OBJECTIVES: There are limited information on outcome, complications and treatments of critically ill COVID-19 patients requiring admission to an intensive care unit (ICU). The aim of this study is to describe the clinical ICU course, treatments used, complications and outcomes, of critically ill COVID-19 patients admitted in seven ICU in Galicia region during the 2020 March-April pandemic peak. METHODS: Between March 21 and April 19, 2020, we evaluated critically ill COVID-19 patients admitted to the ICU of Anesthesia of seven hospitals in Galicia, northwestern Spain. Outcome, complications, and treatments were monitored until May 6, 2020, the final date of follow-up. RESULTS: A total of 97 critically ill COVID-19 patients were included. During ICU stay, mechanical ventilation became necessary in 80 (82.5%) patients, and tracheostomy in 22 (22.7%) patients. Prone position was used frequently in both intubated (67.5%) and awake (27.8%) patients. Medications consisted of antivirals agents (92.7%), corticosteroids (93.8%), tocilizumab (57.7%), and intermediate or high doses of anticoagulants (83.5%). The most frequent complications were ICU-acquired infection (52.6%), thrombosis events (16.5%), and reintubation (9.3%). After a median follow-up of 42 (34-45) days, 15 patients (15.5%) deceased, 73 patients (75.2%) had been discharged from ICU, and nine patients (9.3%) were still in the ICU. CONCLUSIONS: A high proportion of our critically ill COVID-19 patients required mechanical ventilation, prone positioning, antiviral medication, corticosteroids, and anticoagulants. ICU complications were frequent, mainly infections and thrombotic events. We had a relatively low mortality of 15,5%.

Secukinumab: Drug Survival in Clinical Practice Settings. / Secukinumab: supervivencia en práctica clínica real.

Secukinumab, an immunoglobulin G1/κ monoclonal antibody that selectively targets interleukin 17a, is used to treat moderate to severe plaque psoriasis in adults who are eligible for systemic treatment. Indirect comparisons of the efficacy of secukinumab, ustekinumab, and anti-tumor necrosis factor agents have found lower drug survival rates for patients on secukinumab, in spite of that biologic's rapid onset of action and efficacy as demonstrated by the large number of patients reaching a Psoriasis Area and Severity Index of 90 or 100. We present data from a retrospective study of 171 patients treated with doses of 300mg or 150mg of secukinumab every 4 weeks in 5 hospitals in the Spanish autonomous community of Andalusia. Eighty-seven percent continued on treatment at 132 weeks, contrasting with reports from previously published case series.

Efectividad y seguridad de un jarabe de isoniazida 50 mg/mL para uso pediátrico / Effectiveness and safety of a 50 mg/mL isoniazid syrup for pediatric use

Introducción: La tuberculosis pediátrica ha sido una epidemia mundial oculta durante décadas con dificultades para su control, entre las que se encuentra el difícil cumplimiento terapéutico debido a la correcta administración del tratamiento en niños que no pueden deglutir presentaciones farmacéuticas sólidas. El tratamiento de la tuberculosis es una terapia combinada, por lo que en su diseño se tiene que tener en cuenta el volumen final a administrar de todas las formulaciones así como su palatabilidad para favorecer la adherencia terapéutica.Objetivo: Evaluación de la efectividad y seguridad de una fórmula magistral de isoniazida 50 mg/mL.Material y métodos: Estudio observacional retrospectivo de 5 años de duración, incluyendo a todos los pacientes que recibieron dicha fórmula.Se registraron las siguientes variables: edad, sexo, indicación, reacciones adversas y evolución. Bases de datos: Silicon® (soporte informático de dispensación) y IANUS® (historia clínica electrónica). La efectividad se valoró mediante criterios clínicos, radiológicos y/o analíticos. Para la detección de reacciones adversas se realizaron analíticas de sangre y se evaluó la aparición de síntomas asociados a la ingesta de sorbitol que contiene la fórmula.Resultados: Composición de la fórmula (100 mL): isoniazida 5 g, agua conservans 50 mL (contiene Nipagin® 0,08% y Nipasol® 0,02%) y sorbitol 70% 50 mL. El periodo de caducidad establecido fue de 30 días coincidiendo con el referenciado en la bibliografía. El pH de la fórmula orale líquida (FOL) elaborada fue de 6,45±0,05 que corresponde con el de máxima estabilidad del principio activo. (AU)

Introduction: Pediatric tuberculosis has been a global epidemic hidden for decades with difficulties in its control, among which is difficult compliance with treatment due to the correct administration of treatment in children who cannot swallow solid pharmaceutical presentations. The treatment of tuberculosis is a combined therapy, so its design must take into account the final volume to be administered of all the formulations as well as its palatability to promote therapeutic adherence.Objective: Evaluation of the effectiveness and safety of a magisterial formula of isoniazid 50 mg/mL.Material and methods: A 5-year retrospective observational study, including all patients who received this formula.The following variables were recorded: age, sex, indication, adverse reactions and evolution. Databases: Silicon® (dispensing computer support) and IANUS® (electronic medical record). The effectiveness was assessed using clinical, radiological and/or analytical criteria. To detect adverse reactions, blood tests were performed and the appearance of symptoms associated with the intake of sorbitol containing the formula was evaluated.Results: Composition of the formula (100 mL): isoniazid 5 g, preservative water 50 mL (contains Nipagin® 0.08% and Nipasol® 0.02%) and sorbitol 70% 50 mL.The established expiration period was 30 days, coinciding with that referenced in the bibliography. The pH of the elaborated liquid oral formula (LOF) was 6.45±0.05, which corresponds to the maximum stability of the active principle. (AU)

Nonlinear regression analysis of length growth in cultured rainbow trout / [Análise não linear do crescimento em comprimento de truta-arco-íris de aquicultura ]

Length growth as a function of time has a non-linear relationship, so nonlinear equations are recommended to represent this kind of curve. We used six nonlinear models to calculate the length gain of rainbow trout (Oncorhynchus mykiss) during the final grow-out phase of 98 days under three different feed types in triplicate groups. We fitted the von Bertalanffy, Gompertz, Logistic, Brody, Power Function, and Exponential equations to individual length-at-age data of 900 fish. Equations were fitted to the data based on the least square method using the Marquardt iterative algorithm. Accuracy of the fitted models was evaluated using a model performance metrics combining mean squared residuals (MSR), mean absolute error (MAE) and Akaike's Information Criterion corrected for small sample sizes (AICc). All models converged in all cases tested. Evaluation criteria for the Logistic model indicated the best overall fit (0.67 of combined metric MSR, MAE and AICc) under all different feeding types, followed by the Exponential model (0.185), and the von Bertalanffy and Brody model (0.074, respectively). Additionally, ∆AICc results identify the Logistic and Gompertz models as being substantially supported by the data in 100% of cases. The logistic model can be suggested for length growth prediction in aquaculture of rainbow trout.(AU)

O crescimento em comprimento em função do tempo tem uma relação não linear; por isso, funções não lineares são recomendáveis para descrever essa relação. Seis modelos não lineares foram usados para calcular o ganho em comprimento de truta-arco-íris (Oncorhynchus mykiss) durante 98 dias, na fase final da engorda, submetidas a três dietas diferentes em grupos triplicados. Foram ajustadas as equações de von Bertalanffy, Gompertz, logístico, Brody, função potencial e exponencial a dados individuais de comprimento-idade de 900 peixes. O ajuste foi feito pelo método dos mínimos quadrados, usando-se o algoritmo iterativo de Marquardt. A precisão do ajuste foi avaliada pelo uso de critérios combinados de ajuste: quadrado médio do resíduo (QMR), erro médio absoluto (EMA) e o critério de informação de Akaike corrigido para tamanhos amostrais pequenos (AICc). Todos os modelos atingiram a convergência para cada caso avaliado. Os critérios de avaliação do modelo logístico indicaram o melhor ajuste geral (0,67 vez dos critérios combinados MSR, MAE e AICc) para cada grupo de peixe avaliado, seguido pelo modelo exponencial (0,185) e os modelos von Bertalanffy e Brody, com 0,074, respectivamente. Similarmente, os resultados de ΔAICc identificaram-se ao modelo logístico e ao de Gompertz, com grande suporte das informações em 100% dos casos. Por fim, o modelo logístico pode ser sugerido na predição do crescimento em comprimento de truta-arco-íris cultivada.(AU)

Micro-computed tomographic evaluation of the shaping ability of four instrumentation systems in curved root canals.

AIM: To compare the shaping ability of four instrumentation systems in curved molar root canals, using computerized microtomography (micro-CT). METHODOLOGY: Forty mesial roots of mandibular molars were submitted first to radiographic examination to determine their curvature and then to a micro-CT scan to analyse other initial morphological characteristics. The specimens were distributed into four experimental groups, according to the endodontic instrumentation system used (n = 10): Group R, Reciproc; Group PTN, ProTaper Next; Group WOG, WaveOne Gold; Group PDL, ProDesign Logic. After root canal instrumentation, the specimens were submitted to a second micro-CT scan, and the pre- and postoperative data were examined to evaluate the following parameters: volume of dentine removed (DR), increase in root canal volume (VI), untouched root canal surface area (UA), volume of accumulated hard tissue debris (AD) and structure model index (SMI). The data observed for these parameters after instrumentation were analysed using generalized linear models. R software was used for the analyses, and the level of significance adopted was 5%. RESULTS: There were no significant differences among the instrumentation systems regarding the DR, VI, UA and AD parameters (P > 0.05). PTN and WOG systems were associated with greater increases in SMI than the PDL system (P < 0.05). CONCLUSIONS: The four systems evaluated were similar regarding the parameters analysed, with the exception of the SMI, with the rate of variation of this parameter being greater after using the PTN and WOG systems than after using the PDL system. These results indicate that the four systems perform similarly in terms of their shaping ability, but that the PTN and WOG systems produced more rounded preparations than the PDL system.

Counterclockwise or clockwise reciprocating motion for oval root canal preparation: a micro-CT analysis.

AIM: To evaluate oval root canal preparation using one or two instruments in counterclockwise or clockwise reciprocating motion. METHODOLOGY: The radiographic diameter of mandibular human incisors was evaluated, and oval canals were selected (2 ≤ Diameter Ratio ≤ 4). Fifty-seven teeth were assigned to root canal preparation (n = 19): Reciproc 40 (R40) in a counterclockwise reciprocating motion; Mtwo size 40, .06 taper (M 40.06) in a clockwise reciprocating motion or Mtwo size 20, .06 taper and size 40, .06 taper (M 20/40.06) in a clockwise reciprocating motion. Mtwo instruments were coupled to an ENDO DUAL motor, turning 150° clockwise and 30° counterclockwise. Scanning was performed before and after root canal preparation using a SkyScan 1176 micro-computed tomography. Volume, percentage of debris and percentage of uninstrumented surface were analysed in the entire root canal and in each third of the canal. Data were compared using anova and Tukey's tests or Kruskal-Wallis and Dunn tests. RESULTS: The Reciproc and Mtwo systems using different kinematics were associated with a similar increase in root canal volume. Additionally, both system had similar percentage of uninstrumented surface (P > 0.05). Mtwo size 20, .06 taper and size 40, .06 taper was associated with significantly lower debris (P < 0.05) in the middle third (0.56%) when compared to R40 (1.31%) and M size 40, .06 taper (1.54%). CONCLUSIONS: The conventional reciprocation motion for R40 and the clockwise reciprocation motion for Mtwo resulted in similar root canal preparations. Less remaining debris was present in the middle third when two instruments with different diameters were used.