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Biomedical subjects

M D Sousa Neto

Publications and source records attributed to M D Sousa Neto.

15 recordsLinked to original sources
PubMed1998

The influence of different grades of rosins and hydrogenated resins on the powder-liquid ratio of Grossman cements.

In this study, the effect of different grades of rosin and hydrogenated resin on the setting time of Grossman cement was evaluated. The experiments were carried following the American Dental Association Specification number 57 for root canal sealers. For this analysis, different Grossman cement powders were prepared using different grades of rosin (X,WW and WG) and hydrogenated resin (Staybelite and Staybelite ester 10). The pH and electrical conductance of the different grades of rosin and hydrogenated resin were evaluated. The physicochemical properties of the Grossman cements obtained with the different grades of rosin and hydrogenated resins interfere in the powder-liquid ratio of the cements. The sealers obtained with the hydrogenated resin showed a higher powder-liquid ratio.

Abietanes↗
PubMed1996

External and internal anatomy of mandibular molars.

The external and internal anatomy of 628 extracted, mandibular first and second molars was studied. The external anatomy was studied by measuring each tooth and by observing the direction of the root curvatures from the facial surface. The internal anatomy of the pulp cavity was studied by a method of making the teeth translucent.

Brazil↗
PubMed1993

Root canal therapy of an anomalous maxillary central incisor: a case report.

A case of endodontic conservative treatment of a maxillary central incisor with an atypical crown and Type III dens invaginatus is presented. The greatest difficulty was to locate the root canals due to the atypical internal anatomy. There were not two clear canals, but the coronal pulp chamber showed two entrances to the root canal. The tooth presented a distal periodontal pocket and various lingual radicular grooves. The appearance of the crown was improved by alteration of its dimension using diamond rotary instruments and correction with photopolymerized resin.

Child↗
PubMed1993

Internal anatomy, direction and number of roots and size of human mandibular canines.

The internal anatomy, direction and number of roots and size were studied on 830 extracted human mandibular canines. The internal anatomy was studied using the methyl salicylate clearing method, which showed that 98.3% of these teeth presented a single root, with 92.2% presenting one canal and one foramen, 4.9% with two canals and one foramen, and 1.2% with two canals and two foramina. The incidence of two-rooted canines was low, 1.7%. As to direction of the roots, 51% were straight, 14.6% presented mesial, 25.5% distal, 1.0% lingual, 3.2% buccal, and 4.4% sigmoid curvatures. The mean length of the teeth was 25.5 mm, ranging from 20.3 mm to 32.8 mm.

Body Constitution↗
PubMed1993

In vitro study of root canal anatomy of maxillary second premolars.

The external anatomy of 435 maxillary second premolars and the internal anatomy of 300 of these premolars were studied in vitro. For the study of the internal anatomy, the teeth were decalcified and cleared. One canal was found in 67.3% of the second premolars, two canals in 32.4% and three canals in 0.3% of these premolars. A total of 90.3% had one root and 9.7% two roots. A predominance of root curvature toward the distal was found in maxillary second premolars with both one or two roots.

Bicuspid↗
PubMed1992

Root form and canal anatomy of maxillary first premolars.

The external and internal anatomy of 240 extracted, maxillary first premolars was studied. The external anatomy was studied by measuring each tooth and by observing the direction of the root curvatures from the facial and proximal aspects. The internal anatomy of the pulp cavity was studied by a method of making the teeth translucent. A total of 55.8% of the teeth had a single root, 41.7% had two roots and 2.5% had three roots. Considering all of the first premolars, 17.1% had one canal, 80.4% had two canals and 2.5% had three canals.

Bicuspid↗
PubMed1992

Morphologic study of the maxillary molars. Part II: Internal anatomy.

The internal anatomy of three hundred and seventy (370) decalcified and cleared human maxillary molars was studied. Seventy-five percent of the first molars, 58% of the second molars and 68% of the third molars studied presented three (3) root canals and 25% of the first molars, 42% of the second molars and 32% of the third molars presented four (4) root canals. The authors observed that the incidence of two root canals in the mesiobuccal root was higher in second maxillary molars than in first maxillary molars.

Dental Pulp Cavity↗
PubMed1991

Morphologic study of the maxillary molars. 1. External anatomy.

The authors studied the external anatomy, root curvature and degree of root fusion of 744 maxillary first, second and third molars. The root lengths and root curvatures were quite similar on the first and second molars with their lingual roots curving toward the buccal on 54.6% and 52.3% of them, respectively. Complete separation of all three roots was observed on 86.4% of the first molars, 75.9% of the second molars and on only 18.8% of the third molars.

Humans↗
PubMed1991

In vitro study of the incidence of radicular grooves in maxillary incisors.

The purpose of this investigation was to determine the prevalence of radicular grooves in 500 central and 421 lateral extracted maxillary incisors. Radicular grooves were present in 2.0% of the central and 2.6% of the lateral maxillary incisors. The majority of radicular grooves in central maxillary incisors were detected on the buccal root surface (1.6%), and fewer on the lingual root surface (0.4%). In lateral maxillary incisors, the radicular grooves were always observed on the lingual surface.

Brazil↗