Sealing ability of grar MTA AngelusTM, CPM TM and MBPc used as apical plugs

This study evaluated the sealing ability of apical plugs fabricated with gray MTA AngelusTM sealer, CPM TM sealer and MBPc sealer. The root canals of 98 extracted single-rooted human teeth were instrumented with #5 to #1 Gates Glidden drills according to the crown-down technique until the #1 drill could pass through the apical foramen. The specimens were then prepared with K-files, starting with an ISO 50 until an ISO 90 could be visualized 1 mm beyond the apex. After root canal preparation, the external surface of each root was rendered impermeable and roots were assigned to 3 experimental groups (n = 30), which received a 5-mm thick apical plug of gray MTA AngelusTM, CPM TM and MBPc, and two control groups (n=4). The remaining portion of the canal in the experimental groups was filled by the lateral condensation technique. The teeth of each group, properly identified, were fixed on utility wax by their crowns and were placed in plastic flasks, leaving the apex free and facing upward. The flasks were filled with 0.2 percent Rhodamine B solution, pH 7.0, so as to completely cover the root apex of all teeth. The sealing ability was analyzed by measuring 0.2 percent Rhodamine B leakage after all groups had been maintained in this solution for 48 hours. Data were analyzed statistically by Kruskal-Wallis test and Dunn test with a=5 percent. The results showed that, among the tested materials used for fabrication of apical plugs, MBPc sealer had the least amount of leakage with statistically significant difference (p<0.05).

Evaluation of surgical cavities filled with three types of calcium sulfate

The aim of this study was to evaluate histologically, three types of calcium sulfate - Merck (Brazil), Surgiplaster (Italy) and Capset (USA) - in surgically created defects on rabbit femurs. Twenty male New Zealand rabbits were used. Two surgical bone defects (5 mm diameter x 8 mm depth) were created on each distal epiphysis using a #3 Dentoflex trephine bur. Defects were filled with: group 1 - di-hydrated calcium sulfate (Merck); group 2 - Capset (Lifecore-USA); group 3 - Surgiplaster (Classimport-Italy); group 4 - control (blood clot). The animals were sacrificed 30, 60, 90 and 180 days postoperatively. Semi-serial 6-mm-thick sections were obtained, stained with hematoxylin and eosin and examined under light microscopy. Bone defects treated with calcium sulfate exhibited new bone formation regardless of the product trademark.

Sealing ability of cements in root canals prepared for intraradicular posts

This research evaluated the sealer ability of 2 temporary filling materials (white Cimpat and IRM) and 1 restorative cement (glass ionomer), in canals prepared for root posts. Sixty human palatal roots of maxillary first molars were used. They were divided into 3 groups, according to the cements used: Group I (Cimpat), Group II (IRM) and Group III (glass ionomer). The roots were rendered impermeable, filled with the respective cements and soon after immersed into 0.2 percent Rhodamine B dye and maintained for 72 hours in an oven for 37°C. Microleakage was measured with a light microscope, cutting the roots longitudinally in buccolingual direction. The results showed that Group I presented significantly more leakage than Groups II and III, which were not significantly different from each other.

Esta pesquisa avaliou a capacidade seladora de dois cimentos temporários (Cimpat branco e IRM) e um cimento restaurador em canais preparados para pinos intra-radiculares. Foram usadas 60 raízes palatinas de primeiros molares superiores humanos. Elas foram divididas em 3 grupos, conforme os cimentos usados: grupo I (Cimpat), grupo II (IRM) e grupo III (ionômero de vidro). As raízes foram impermeabilizadas, preenchidas com os respectivos cimentos e em seguida imersas em tintura de Rhodamina B a 0,2 por cento e mantidas por 72 horas em uma estufa a 37°C. A micro infiltração foi mensurada com um microscópio de luz nas raízes cortadas longitudinalmente, na direção vestíbubo-lingual. Os resultados mostraram que o grupo I apresentou, de modo significante, mais infiltração do que os grupos II e III, enquanto que entre estes não houve diferença significante.

Sealing ability of cements in root canals prepared for intraradicular posts%Capacidade seladora de cimentos em canais radiculares preparados para pinos intra-radiculares

Esta pesquisa avaliou a capacidade seladora de dois cimentos temporários (Cimpat branco e IRM) e um cimento restaurador em canais preparados para pinos intra-radiculares. Foram usadas 60 raízes palatinas de primeiros molares superiores humanos. Elas foram divididas em 3 grupos, conforme os cimentos usados: grupo I (Cimpat), grupo II (IRM) e grupo III (ionômero de vidro). As raízes foram impermeabilizadas, preenchidas com os respectivos cimentos e em seguida imersas em tintura de Rhodamina B a 0,2 por cento e mantidas por 72 horas em uma estufa a 37ºC. A micro infiltração foi mensurada com um microscópio de luz nas raízes cortadas longitudinalmente, na direção vestíbubo-lingual. Os resultados mostraram que o grupo I apresentou, de modo significante, mais infiltração do que os grupos II e III, enquanto que entre estes não houve diferença significante