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Objetivo. Evaluar el efecto del tratamiento con ácido zoledrónico e hidroxocobalamina sobre la microarquitectura ósea alveolar en ratones con periodontitis y osteoporosis inducidas. Métodos. Diseño experimental en fase preclínica. Se incluyeron 16 ratones hembras a quienes se les indujo osteoporosis mediante la ovariectomía total y también se indujo la periodontitis por inflamación por ligadura de seda negra 5/0 en el segundo molar maxilar, todos los protocolos fueron sometidos durante anestesia general. Los ratones se distribuyeron en 4 grupos: control, tratamiento con ácido zoledrónico, tratamiento con hidroxocobalamina y tratamiento combinado. A las 16 semanas, se realizó la autanasia, se realizó la disección para la evaluación mediante microtomografía; determinando la densidad mineral ósea (BMD), el volumen de hueso (BV/TV), espesor trabecular (Tb. Th), número de trabéculas (Tb.N), separación trabecular (Tb.Sp); se realizó el análisis descriptivo y bivariado mediante ANOVA de 1 vía considerando un 95% de nivel de confianza. Resultados. El grupo que recibió tratamiento combinado de ácido zoledrónico e hidroxocobalamina presentó mayor densidad mineral ósea (DMO), mayor volumen óseo (BV/TV) y menor separación trabecular (Tb.Sp) en comparación con el grupo de control (p<0,05). Conclusiones. El tratamiento combinado de ácido zoledrónico e hidroxocobalamina mejora las características microarquitectónicas óseas en ratones con osteoporosis y periodontitis inducidas.

Objective. Evaluate the effect of zoledronic acid and hydroxocobalamin treatment on alveolar bone microarchitecture in mice with induced periodontitis and osteoporosis. Methods. Experimental design in preclinical phase. Sixteen female mice were included in which osteoporosis was induced by total ovariectomy and periodontitis was also induced by inflammation by 5/0 black silk ligation of the maxillary second molar, all protocols were performed under general anesthesia. The mice were distributed into 4 groups: control, treatment with zoledronic acid, treatment with hydroxocobalamin and combined treatment. At 16 weeks, euthanasia was performed, dissection was performed for evaluation by microtomography; determining bone mineral density (BMD), bone volume (BV/TV), trabecular thickness (Tb.Th), number of trabeculae (Tb.N), trabecular separation (Tb.Sp); descriptive and bivariate analysis was performed using 1-way ANOVA with a 95% confidence level. Results. The group that received combined treatment of zoledronic acid and hydroxocobalamin presented higher bone mineral density (BMD), higher bone volume (BV/TV) and lower trabecular separation (Tb.Sp) compared to the control group (p<0.05). Conclusions. Combined treatment with zoledronic acid and hydroxocobalamin improves bone microarchitectural features in mice with induced osteoporosis and periodontitis.

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Introduction: Intracanal medication with antibiotics is used to ensure the success of treatments. However, no studies evaluating the efficacy of triantibiotic paste after several hours of preparation have been reported. Objective: To evaluate the antimicrobial activity of the triantibiotic paste against Enterococcus faecalis, according to the time of application and storage of the components used for its preparation. Methods: An experimental in vitro study was carried out in the microbiology laboratory of Universidad Nacional Mayor de San Marcos. The sample consisted of three colonies of Enterococcus faecalis, formed in bile-esculin agar. On three specific days (0, 14 and 28), the antimicrobial activity of the conventional (ciprofloxacin/metronidazole/minocycline) and modified (cefaclor/metronidazole/minocycline) paste was evaluated, measuring (mm) the inhibition zones. The freshly obtained components were used to prepare the paste on day 0, and the stored components (powdered antibiotics kept in amber glass bottles at room temperature) were used on days 14 and 28. Two interventions were performed on each specific day (morning and afternoon). Freshly prepared pastes were used in the morning (immediate application), while pastes stored for 6 hours (delayed application) were used in the afternoon. Results: On day 0, it was found that the modified triantibiotic paste of immediate application had higher antimicrobial activity than the one of delayed application (p = 0.046). On day 28, the conventional triantibiotic paste for immediate application showed higher antimicrobial activity than that for delayed application (p = 0.049). Pasta prepared with fresh components (day 0) had higher antimicrobial activity than pasta prepared with components stored for 14 and 28 days. Conclusions: The application time of the triantibiotic paste and the storage times of the components could influence the antimicrobial activity for the eradication of Enterococcus faecalis(AU)

Introducción: La medicación intracanal con antibióticos se utiliza para asegurar el éxito de los tratamientos. Sin embargo, no se han reportado estudios que evalúen la eficacia de la pasta triantibiótica después de varias horas de preparación. Objetivo: Evaluar la actividad antimicrobiana de la pasta triantibiótica frente al Enterococcus faecalis, según el tiempo de aplicación y de almacenamiento de los componentes utilizados para su preparación. Métodos: Estudio experimental in vitro, realizado en el laboratorio de microbiología de la Universidad Nacional Mayor de San Marcos. La muestra consistió en tres colonias de Enterococcus faecalis, formadas en agar bilis-esculina. En tres días específicos (0, 14 y 28) se evaluó la actividad antimicrobiana de la pasta convencional (ciprofloxacina/metronidazol/minociclina) y modificada (cefaclor/metronidazol/minociclina), midiendo las zonas de inhibición (mm). Los componentes recién obtenidos se utilizaron para preparar la pasta el día 0, y los componentes almacenados (antibióticos pulverizados conservados en frascos de vidrio color ámbar a temperatura ambiente) se utilizaron los días 14 y 28. Se realizaron dos intervenciones en cada día específico (mañana y tarde). Las pastas recién preparadas se utilizaron por la mañana (aplicación inmediata), mientras que por la tarde se utilizaron las pastas almacenadas durante 6 horas (aplicación tardía). Resultados: El día 0, se encontró que la pasta triantibiótica modificada de aplicación inmediata presentó una actividad antimicrobiana superior a la de aplicación tardía (p = 0,046). El día 28, la pasta triantibiótica convencional de aplicación inmediata presentó una actividad antimicrobiana superior a la de aplicación tardía (p = 0,049). La pasta preparada con componentes recién obtenidos (día 0) tuvo una mayor actividad antimicrobiana que la pasta preparada con componentes almacenados durante 14 y 28 días. Conclusiones: El tiempo de aplicación de la pasta triantibiótica y los tiempos de almacenamiento de los componentes podrían influir en la actividad antimicrobiana para la erradicación de Enterococcus faecalis(AU)

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Objective : The aim of the present study was to evaluate the synergistic anti-inflammatory effect of Non-steroidal anti-inflammatory drugs (NSAIDs) plus B vitamins administered pre and postoperatively in surgeries of impacted mandibular third molars. Material and Methods : Double-blind randomized clinical trial, sixty-six patients participated and were randomized into 2 groups. The control group was administered meloxicam 15 mg intramuscularly plus placebo orally and to the experimental group, meloxicam 15 mg intramuscularly plus vitamins B [B1, B6, and B12] orally; both treatments were administered preoperatively. The anti-inflammatory effect was evaluated by pain intensity, facial swelling (facial contour measurements), and mouth opening (distance between the upper and lower incisors) during the post-surgical phase. Student's t-test was performed for independent samples. Results : In all the evaluated times (1 hour, 6 hours, 12 hours, 24 hours, 2 days, and 3 days after the end of the surgery) the experimental group presented a significantly lower intensity of pain compared to the control group (p<0.05). The highest pain intensity was recorded at 6 hours (17.7 ± 9.1 mm in the experimental group and 34.5 ± 21.3 mm in the control group). Swelling and mouth opening were similar in both groups, at all times evaluated (p>0.05). Conclusion : In the present study, the administration of NSAIDs plus B vitamins (B1, B6, B12) produced lower intensity of pain compared to the administration of only NSAIDs. Nevertheless, swelling and mouth opening were similar in all evaluations for both study groups (AU)

Objetivo : O objetivo do presente estudo foi avaliar o efeito anti-inflamatório sinérgico de anti-inflamatórios não esteroidais (AINEs) com vitaminas do complexo B administrados no pré e pós-operatório de cirurgias de terceiros molares inferiores impactados. Material e Métodos: Ensaio clínico randomizado duplo-cego, 66 participantesque foram randomizados em 2 grupos. O grupo controle recebeu Meloxicam 15 mg por via intramuscular + placebo por via oral e o grupo experimental, Meloxicam 15 mg por via intramuscular + vitaminas B [B1, B6 e B12] por via oral; ambos os tratamentos foram administrados no pré-operatório. O efeito anti-inflamatório foi avaliado pela intensidade da dor, edema facial (medidas do contorno facial) e abertura da boca (distância entre os incisivos superiores e inferiores) durante a fase pós-cirúrgica. Foi aplicado o teste t de Student para amostras independentes. Resultados: Em todos os tempos avaliados (1 hora, 6 horas, 12 horas, 24 horas, 2 dias e 3 dias após o término da cirurgia) o grupo experimental apresentou uma intensidade de dor significativamente menor em relação ao grupo controle (p <0,05). A maior intensidade de dor foi registrada em 6 horas (17,7 ± 9,1 mm no grupo experimental e 34,5 ± 21,3 mm no grupo controle). Edema e abertura bucal foram semelhantes nos dois grupos, em todos os momentos avaliados (p>0,05). Conclusão: No presente estudo, a administração de AINEs com vitaminas do complexo B (B1, B6, B12) resultou em menor intensidade de dor em comparação com a administração apenas de AINEs. No entanto, o edema e a abertura da boca foram semelhantes em todas as avaliações para ambos os grupos de estudo (AU).

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Introducción: Las emergencias son circunstancias de aparición súbita que pueden presentarse durante la atención odontológica y pueden comprometer la vida del paciente; por ello, es necesario tener conocimientos sobre su diagnóstico y tratamiento primario para estabilizar al paciente. Objetivo: Determinar el nivel de conocimientos sobre la atención de emergencias médicas en estudiantes de Odontología de dos universidades peruanas. Material y Métodos: Estudio transversal descriptivo en el cual participaron 134 estudiantes de 7mo a 10mo ciclo, provenientes de la Universidad Científica del Sur y la Universidad Norbert Wiener. Se evaluaron los conocimientos sobre la atención de emergencias médicas considerando 3 dimensiones: diagnóstico, primeros auxilios y tratamiento farmacológico. La evaluación fue realizada mediante un cuestionario validado previamente. Resultados: El nivel general de conocimientos sobre la atención de emergencias médicas en ambas universidades fue regular, con 69,8 por ciento de estudiantes de la Universidad Científica del Sur y 53,5 por ciento de estudiantes de la Universidad Norbert Wiener; sin embargo, hubo diferencia significativa entre ambas universidades. (p=0,034). Asimismo, se observó diferencia significativa en el conocimiento sobre el diagnóstico, a favor de la Universidad Científica del Sur (p<0,05), pero no se encontraron diferencias al evaluar los conocimientos sobre primeros auxilios y tratamiento farmacológico (p<0,05). Conclusiones: La evaluación general de conocimientos sobre la atención de emergencias médicas en estudiantes de Odontología de Universidad Científica del Sur y la Universidad Norbert Wiener fue predominantemente regular(AU)

Introduction: Emergencies are circumstances of sudden onset that can occur during dental care and can compromise the patient's life; therefore, it is necessary to have knowledge about its diagnosis and primary treatment to stabilize the patient. Objective: To determine the level of knowledge about medical emergency care in dental students from two universities in Lima (Peru) in 2019. Material and Methods: A descriptive cross-sectional study that included 134 students from 7th to 10th cycle from the Científica del Sur University and the Norbert Wiener University was conducted. Knowledge of medical emergency care was evaluated considering 3 dimensions: diagnosis, first aid, and pharmacological treatment. The evaluation was carried out using a previously validated questionnaire. Results: The general level of knowledge on medical emergency care in both universities was regular, with 69,8 percent of students from Científica del Sur University and 53,5 percent of students from Norbert Wiener University; however, there was a significant difference between both universities (p = 0.034). Likewise, a significant difference was observed in the knowledge about diagnosis in favor of the Científica del Sur University (p0.05). Conclusions: The overall level of knowledge on medical emergency care in dental students at Científica del Sur University and Norbert Wiener University was predominantly fair(AU)

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Context: Oral administration of midazolam is one of the most important protocols for producing adequate conscious sedation; however, it has an unpleasant taste and is poorly tolerated by pediatric patients. Aim: The aim of this study was to evaluate the sedative effect of diluted midazolam in different vehicles used to mask its unpleasant taste. Methods and Material: A total of 30 male mice (BALB-c) were randomly distributed in five groups. They were administered diluted midazolam in different vehicles (saline solution, paracetamol syrup, diclofenac suspension, multi-vitamin syrup, and boxed juice). All suspensions were administered orally (0.6 mg/Kg). The pH variation was evaluated with a digital pH meter, and the quality of sedation was evaluated in three tests: hole board test, grip strength test, and forced swimming test. Results: The paracetamol syrup vehicle was found to be the only vehicle which did not change its pH over time after dilution of midazolam. When evaluating the perforated platform, the greatest sedative effect was observed in the midazolam group with the paracetamol syrup (P > 0.05). Regarding grip strength, a difference was evident in all study groups at 45 minutes (P = 0.006); the midazolam group with the multi-vitamin syrup was less effective. Regarding the response time to forced swimming, the midazolam group with the paracetamol syrup presented the longest time at 15 and 30 minutes (5.39 ± 0.93 and 6.29 ± 0.83, respectively). Conclusion: The suspension of midazolam diluted in the paracetamol syrup is the most suitable for performing conscious sedation efficiently.

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Introducción: La alcalinización de la lidocaína ha resultado ser exitosa en el bloqueo del nervio dentario inferior, sin embargo, existen resultados contradictorios respecto a su eficacia clínica. Objetivo: Determinar el efecto de la lidocaína 2 por ciento con adrenalina 1:80000 alcalinizada con bicarbonato de sodio al 8,4 % sobre el bloqueo del nervio dentario inferior. Material y métodos: Estudio experimental, prospectivo y longitudinal conformado por 50 pacientes de la Facultad de Odontología de la Universidad Nacional Mayor de San Marcos. Las siguientes soluciones fueron administradas para el bloqueo del nervio dentario inferior: lidocaína 2 por ciento con adrenalina 1:80000 alcalinizada con bicarbonato de sodio al 8,4 por ciento y lidocaína 2 por ciento con adrenalina 1:80000 no alcalinizada. Se evaluó la intensidad del dolor por la inyección, parámetros hemodinámicos y periodos anestésicos (tiempo de inicio de acción y duración del efecto anestésico). Resultados: Se evidenció una menor intensidad del dolor por la inyección en el grupo de lidocaína alcalinizada (19,16 ± 2,7) en comparación al grupo de lidocaína no alcalinizada (22,88 ± 4,2); p=0,02. Así mismo, el tiempo de inicio de acción fue menor en el grupo de lidocaína alcalinizada (105,72 ± 9,7s) en comparación con el grupo de lidocaína no alcalinizada (157,52 ± 12,1); p=0,002. Sin embargo, no se evidenciaron diferencias significativas en los parámetros hemodinámicos (p>0,05) y la duración del efecto anestésico (p=0,114). Conclusiones: La lidocaína 2 por ciento con adrenalina 1:80000 alcalinizada con bicarbonato de sodio al 8,4 por ciento sobre el bloqueo del nervio dentario inferior produce una disminución de la intensidad del dolor por la inyección y del tiempo de inicio de acción, en comparación con la formulación no alcalinizada. Sin embargo, no se evidencian diferencias en relación con los parámetros hemodinámicos ni a la duración del efecto anestésico(AU)

Introduction: The alkalinization of lidocaine has been successful in blocking the inferior dental nerve; however, there are contradictory results regarding its clinical efficacy. Objective: To determine the effect of 2 percent lidocaine with 1: 80,000 adrenaline alkalinized with 8.4 percent sodium bicarbonate on inferior dental nerve block. Material and methods: Experimental, prospective and longitudinal study that comprised 50 patients from the Dental School of the National University of San Marcos. The following solutions were administered for inferior dental nerve block: 2 percent lidocaine with epinephrine 1: 80,000 alkalinized with 8.4 percent sodium bicarbonate and 2 percent lidocaine with 1: 80,000 adrenaline not alkalinized. Pain intensity was evaluated by injection, hemodynamic parameters and anesthetic periods (time of onset of action and duration of the anesthetic effect). Results: There was a lower pain intensity due to injection in the alkalized lidocaine group (19.16 ± 2.7) compared to the non-alkalinized lidocaine group (22.88 ± 4.2); p=0.02. Likewise, the onset time of action was lower in the alkalized lidocaine group (105.72 ± 9.7) compared to the non-alkalinized lidocaine group (157.52 ± 12.1); p=0.002. However, no significant differences were found in the hemodynamic parameters (p>0.05) and the duration of the anesthetic effect (p=0.114). Conclusions: Lidocaine 2 percent with adrenaline 1: 80,000 alkalized with sodium bicarbonate at 8.4 percent on the block of the inferior dental nerve produces a decrease in pain intensity due to injection and the time of onset of action, compared to the non-alkalinized formulation. However, there are no differences in relation to the hemodynamic parameters or the duration of the anesthetic effect(AU)

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BACKGROUND AND OBJECTIVE: Chuquiraga spinosa Lessing (ChS) has shown protective effect on  N-Nitroso-N-methylurea (NMU)-induced prostate cancer in rats. Currently, statins are being studied for their pro-apoptotic and antimetastatic effects. The main objective of this research was to determine the protective effect associated with the oral administration of simvastatin and ethanolic extract of the aerial parts of ChS in the prevention of prostate cancer. METHODS: Fifty-six albino male rats were randomized into seven groups: I) negative control: physiological serum: 2 mL/kg; II) TCN: testosterone 100 mg/kg + cyproterone 50 mg/kg + NMU 50 mg/kg; III) TCN + S40 (simvastatin 40 mg/kg); IV) TCN + ChS250 (ChS 250 mg/kg); V) TCN + ChS50 (ChS 50 mg/kg) + S40; VI) TCN + ChS250 (ChS 250 mg/kg) + S40; and VII) TCN + ChS500 (ChS 500 mg/kg) + S40. The antioxidant activity was tested by using (2,2-diphenyl-1-picrylhydrazyl) (DPPH) assay. Hematology, toxicological biochemical parameters, prostate-specific antigen (PSA), histology and prostate size were evaluated as main indicators of protective effect. RESULTS: Triglyceride values were decreased in the groups receiving ChS, being significant (P=0.02) in IV and VII group compared to cancer-inducing group (TCN). In groups that received ChS, PSA levels (P=0.71) were significant compared with TCN group. The VII group had the lowest prostate volume by sonography. The TCN group showed multiple foci of high-grade prostatic intraepithelial neoplasia (HG-PIN) with the presence of cells in mitosis; whilst, groups V and VI had few areas of HG-PIN. CONCLUSION: In experimental conditions, the ethanolic extract of C. spinosa in association with simvastatin showed a protective effect on prostate cancer through hypolipidemic and antioxidant activity.

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Piper aduncum, commonly known as matico, is a plant that grows in the mountainous and coastal regions of Peru, and is studied for its antimicrobial properties and various ethnopharmacological uses. The main objective of this study was to determine the cytoprotective and antioxidant effects of the methanolic extract of Piper aduncum leaves in Mus musculus previously administered with sodium fluoride (NaF) using the Micronucleus test and the Comet assay. The extract was administrated orally in four different concentrations: 150, 300, 600, and 1200 mg/Kg for ten days. At the 11th day, a single dose of NaF was administrated via intraperitoneal at 20 mg/Kg. The genotoxicity study was performed with mice from the strain BALB/c, using the Micronucleus test on bone marrow and the Comet assay on peripheral blood according to OECD guidelines 474 and 489, respectively. The statistical analysis was performed by median analysis with ANOVA. Significant differences were found in Micronucleus frequency between the highest concentrations of Piper aduncum and NaF. The Comet assay showed significant reduction of NaF-induced damage on erythrocytes depending on the different concentrations of the extract which were evaluated in this study. It is concluded that the methanolic extract of P. aduncum leaves has cytoprotective and antioxidant activity against sodium fluoride.

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Objective: To evaluate the effects of administering diclofenac and ketoprofen, as well as the effects of environmental oxygen pressure variation on mandibular bone regeneration. Methods: Thirty-six guinea pigs were distributed into two equal groups. Mandibular bone defects were performed on both groups. Group A was monitored under oxygen pressure at altitude (3320msl, 107mm Hg). Group B was monitored at sea level oxygen pressure (150msl, 157mm Hg). Each group was subdivided into 3 equal groups (A1, A2, A3 and B1, B2, B3). Subgroups A1 and B1 were given diclofenac; subgroups A2 and B2 ketoprofen; subgroups A3 and B3 NaCl. Bone regeneration was evaluated histologically on days 15 and 30. Results: After 15 days in the group controlled at sea level, the level of osteoblasts presented by the control subgroup was significantly higher (28.00±2.65) compared to the diclofenac subgroup (16.00±6.25) and to the ketoprofen subgroup (18.00±4.36); (p=0.041). After 15 days in the group controlled at altitude, the level of osteoblasts was significantly higher in the control subgroup (38.00±5.29) compared to the diclofenac subgroup (21.67±6.35) and to the ketoprofen subgroup (19.33±2.52); p=0.007. After 30 days in the group at sea level there was no difference found in the cell counting; p>0.05. After 30 days in the group controlled at altitude, the level of osteoblast was significantly higher in the control subgroup (58.00±4.58) compared to the diclofenac subgroup (34.33±4.73) and the ketoprofen subgroup (34.00±11.14); (p=0.003). Conclusion: The administration of diclofenac and ketoprofen produced lower mandibular bone regeneration, the effect being significantly more negative at sea level.

Objetivo: Evaluar el efecto de la administración de diclofenaco y ketoprofeno y de la variación de la presión de oxígeno ambiental sobre la regeneración ósea mandibular. Métodos: Participaron 36 cobayos distribuidos en dos grupos iguales. A ambos grupos se les realizaron defectos óseos mandibulares. El Grupo A fue controlado bajo presión de oxígeno en altura (3320msnm, 107mm Hg). El Grupo B fue controlado bajo presión de oxígeno a nivel del mar (150msnm, 157mm Hg). Cada grupo fue dividido en 3 subgrupos iguales (A1, A2, A3 y B1, B2, B3). Los subgrupos A1 y B1 recibieron diclofenaco; A2 y B2, ketoprofeno; A3 y B3, NaCl. La regeneración ósea fue evaluada histológicamente a los 15 y 30 días. Resultados: A nivel del mar, a los 15 días, hubo una significativa mayor cantidad de osteoblastos en el subgrupo control (28,00±2,65) comparado con el subgrupo diclofenaco (16,00±6.25) y ketoprofeno (18,00±4.36); (p=0,041). En altura, a los 15 días, hubo una significativa mayor cantidad de osteblastos en el subgrupo control (38,00±5,29) comparado con el subgrupo diclofenaco (21,67±6,35) y ketoprofeno (19,33±2,52); p=0,007. A nivel del mar, a los 30 días, no se encontró diferencia en el conteo celular; p>0,05. En altura, a los 30 días, se encontró una significativa mayor cantidad de osteoblastos en el subgrupo control (58,00±4,58) comparado con el subgrupo diclofenaco (34,33±4,73) y ketoprofeno (34,00±11,14); (p=0,003). Conclusión: La administración de diclofenaco y ketoprofeno produjeron una menor regeneración ósea mandibular, siendo este efecto significativamente más negativo a nivel del mar.

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RESUMEN: Objetivo: Evaluar la influencia de la variación en la presión de oxígeno ambiental sobre la regeneración ósea guiada en cobayos. Material y método: Treinta y dos cobayos machos de 750±50g de peso fueron asignados en 2 grupos de 16 integrantes cada uno (grupo A: trabajado a 150msnm en la ciudad de Lima y a presión de oxígeno de 157mmHg; grupo B: trabajado a 3.230msnm en la ciudad de Jauja y a presión de oxígeno de 107mmHg). En ambos grupos se indujeron defectos óseos mandibulares de 5×6mm a través de un acceso quirúrgico extraoral; a 8 cobayos de cada grupo se les recubrió el defecto con una membrana de colágeno reabsorbible de origen porcino, mas al resto de animales no. Se evaluó el conteo celular de osteoblastos y osteocitos a los 15 y 30 días postoperatoriamente. Resultados: A los 15 y a los 30 días, en los grupos trabajados en altura y en los que se aplicó la membrana, la cantidad de osteoblastos fue 71±12,1 cél/camp y 83±7,2 cél/camp respectivamente, y la de osteocitos fue 34,5±6,6 cél/camp y 25±7,6 respectivamente; siendo estos grupos, en todas las comparaciones, los que tuvieron mayor cantidad de células óseas, aunque sin ser diferencias estadísticamente significativas (p>0,05). Conclusión: Se encontró tendencia a formar mayor cantidad de células óseas en las muestras tratadas con regeneración ósea y expuestas a la altitud comparados con el nivel del mar.

ABSTRACT: Objective: To evaluate the influence of the variation in ambient oxygen pressure on guided bone regeneration in guinea pigs. Material and method: A total of 32 male guinea pigs weighing 750±50g were assigned into two groups of 16 (group A: studied at 150 metres above sea level in the city of Lima and oxygen pressure of 157mmHg; group B: was at 3230 meters above sea level in the city of Jauja and an oxygen pressure of 107mmHg). Bone defects of 5×6mm were induced in the jaw in both groups through extra-oral surgical access. The defect in 8 guinea pigs of each group were covered with a porcine resorbable collagen membrane, but not in the other animals. The osteoblast and osteocyte cell counts were evaluated at 15 and 30 days post-operatively. Results: At 15 and 30 days, in the groups studied at height and with the membrane applied, the osteoblast count was 71±12.1 cells/field, and 83±7.2 cells/field, respectively, and an osteocyte count of 34.5±6.6 cells/field, and 25±7.6 cells/field, respectively. These groups had a higher number of bone cells in all the comparisons, but there were no statistically significant differences (P>.05). Conclusion: There was a tendency to form a greater amount of bone cells was found in the samples treated with bone regeneration and exposed to altitude compared to those at sea level.

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