pH changes in radicular dentine associated with calcium hydroxide and corticosteroid/antibiotic pastes.

The aim was to compare hydroxyl ion diffusion through dentine following placement of calcium hydroxide and Ledermix paste. Thirty-six teeth were divided into one control (n = 6) and three experimental (n = 10) groups - (i) Pulpdent paste; (ii) Pulpdent/Ledermix pastes; (iii) Ledermix paste and (iv) Saline. pH was measured in inner and outer dentine cavities over 12 months. Inner dentine time to maximum pH (Tmax ) was 1 week for Pulpdent and 2 weeks for Pulpdent/Ledermix. Pulpdent's outer dentine Tmax was 4 weeks and Pulpdent/Ledermix was 10 weeks. After day 1, Pulpdent pH was higher and this continued for 12 months. Pulpdent's outer dentine pH was higher than Ledermix and controls, but not significantly different from Pulpdent/Ledermix. Pulpdent/Ledermix had significantly higher pH than controls and Ledermix from day 5 until 10 months when Pulpdent/Ledermix outer dentine pH decreased and became similar. In all groups, pH reduced after 3 months.

Hydroxyl Ion Diffusion through Radicular Dentine When Calcium Hydroxide Is Used under Different Conditions.

Calcium hydroxide's anti-bacterial action relies on high pH. The aim here was to investigate hydroxyl ion diffusion through dentine under different conditions. Teeth were divided into control (n = 4) and four experimental groups (n = 10): Group 1-no medicament; Group 2-Calmix; Group 3-Calmix/Ledermix; Group 4-Calasept Plus/Ledermix; Group 5-Pulpdent/smear layer. Deep (inner dentine) and shallow (outer dentine) cavities were cut into each root. pH was measured in these cavities for 12 weeks. The inner and outer dentine pH in Group 2 was significantly higher than all groups. Inner dentine pH in Group 3 was slightly higher than that in Group 4 initially but subsequently comparable. After Day 2, Group 5 had significantly lower pH than Groups 3 and 4. The outer dentine pH in Group 3 started higher than that in Groups 4 and 5, but by Day 28 the difference was insignificant. The time for the inner dentine to reach maximum pH was one week for Group 2 and four weeks for Groups 3 and 4. The time for the outer dentine to reach maximum pH was eight weeks for all experimental groups. Mixing different Ca(OH)2 formulations with Ledermix gave similar hydroxyl ion release but pH and total diffusion was lower than Ca(OH)2 alone. The smear layer inhibited diffusion.

Evaluation of smear layer removal by bicarbonate soda, ethylenediamine tetraacetic acid with cetrimide and sodium hypochlorite with a new model.

Various methods are used to evaluate irrigants. The primary aim was to develop a model for preliminary testing of potential irrigants. The second aim was to investigate the effect of bicarbonate soda on smear layer by comparing it with ethylenediamine tetraacetic acid with cetrimide (EDTAC) and sodium hypochlorite (NaOCl). Extracted human single-canal teeth were halved, and a uniform filing method was used to create smear layer. The following solutions were then applied - distilled water (control), 1% NaOCl, 17% EDTAC and bicarbonate soda at concentrations of 1%, 5%, 10% and 15%. Some samples had multiple solutions in different sequences. Samples were examined by scanning electron microscopy. Representative images were scored based on the degree of smear layer remaining. Results were analysed with the SAS system, using the GENMOD procedure. Complete smear layer was found in samples treated with all solutions except EDTAC used alone. There were no significant differences between the sequences, EDTAC/NaOCl/EDTAC and NaOCl/EDTAC/NaOCl. There were no significant differences between groups with and without bicarbonate soda. In conclusion, the model was effective for testing chemical effects on solutions on smear layer. Bicarbonate soda did not remove smear layer and provided no additional cleaning effects after EDTAC and NaOCl.

Comparación entre la preparación invertida y la preparación telescópica para evitar exacerbaciones en dientes necróticos con lesión periapical observada radiográficamente / Comparison between the crown-down pressureless technique and the step-back tecbique to prevent exacerbations on necrotic teeth with radiographic signs of periapical lesion

El propósito de este estudio prospectivo fue comparar el uso de la técnica de preparación invertida y la técnica de preparación de conductos necróticos con lesión periapical observada radiográficamente, para encontrar cuál evita que se presente una exacerbación en el paciente. Se estudiaron 245 pacientes, los cuales fueron divididos en dos grupos: 135 paciente a los que se les aplicó la técnica de preparación telescópica, y 110 a los que se les realizó la técnica de preparación invertida.

Informe final servicio social obligatorio / Final report obligatory social service

Trabajo presentado como parte del ano de servicio social obligatorio de odontologia hecho en la Clinica Infantil Colsubsidio de Bogota. La seguridad social se define como la politica de distribucion de ingresos en forma equitativa y adaptable a cada individuo, en atencion a sus necesidades de salud.. Regida por los principios de universalidad, integridad, solidaridad, unidad e internacionalidad. En Colombia esta conformada por el Instituto de Seguros Sociales, las cajas de compensacion familiar, la caja nacional de prevision y los servicios de asistencia social. Proporciona seguros de atencion medica, maternidad, funerales, atencion de los accidentes de trabajo, enfermedades profesionales, invalidez, desempleo. Se considera el trabajo en equipo como fundamental en el desempeno de las funciones profesionales del personal de salud..