Biomedical subjects

V Blasković-Subat

Publications and source records attributed to V Blasković-Subat.

6 recordsLinked to original sources

PubMed1997

Preparation of simulated root canals using the Macfile, Canal Master U and K-Flexofile.

The efficacy of three different root canal instruments in maintaining the original shape of curved canals was evaluated. Acrylic blocks were prepared to simulate canals with 40 degrees and 60 degrees curvature. K-Flexofiles and Macfiles were used with a step-back technique utilizing an 'in/out' filing motion. The balanced-force technique was used with Canal Master 'U' instruments. Ten 40 degrees and 10 60 degrees canals were prepared with each instrument. The results were evaluated using superimposed photographic slides at x20 magnification to show the canals before and after the instrumentation. The width of the prepared canals was measured at their convex/concave point to determine the divergence of the instrumented canal shape from the original canal shape. The measurements were taken at the level of the apical foramen and 3 and 6 mm coronal to it. In this way it was possible to recognize all the defects created during the preparation of a canal. Among the tested instruments, the Macfile provoked minimal canal deviation (P = 0.05). The Canal Master 'U' was similarly effective (P = 0.05), but had the highest incidence of instrument fracture. The K-Flexofile demonstrated the most defects in canal preparation and canal deviation, particularly at the level of the apical foramen (P < 0.01).

Acrylic Resins↗

PubMed1995

A computerized method for the evaluation of root canal morphology.

The objective of this research was to develop a technique that would allow three-dimensional imaging of root canals utilizing computer image processing. Ten single-rooted permanent human teeth with mature apices were analysed. The teeth were decoronated and fixed on boards with the long axis of the root perpendicular to the board. The cross-sectioning started at the root apex and continued in the coronal direction, roughly perpendicular to the long axis of the ++root. The samples were divided into two groups. The first five samples were sectioned 15 times, each section being 0.5-mm thick, in order to obtain the three-dimensional reconstruction of the root and the root canal. The root apex of each sample was cross-sectioned 19 times and each section was 0.2-mm thick. After each section, the root canal contour was defined utilizing the calibrated net with coordinate system in the ocular of the stereomicroscope. The coordinates of the root canal cross-section contour thus determined, together with the value of the thickness of each cut, were relevant input data for the reconstruction of the root canal cross-sections, longitudinal sections and for the final three-dimensional rebuild of the root and the root canal model. this technique appears to be highly accurate in determining the anatomy of the root canal system and may also be applied in other fields of dental research.

Computer Simulation↗

PubMed1992

Asymmetry of the root canal foramen.

Deviation of the major apical foramen from the anatomical root apex is a recognized phenomenon. To determine the frequency, position and mean distance of the major apical foramen from the anatomical root apex, 230 roots of permanent teeth were examined stereomicroscopically and radiographically. Radiographic analysis was used to establish how accurate the conventional radiograph was in displaying such a deviation. The frequency of deviation of the major foramen, determined stereomicroscopically, was 76%, and depended on the type of teeth examined. Radiographic analysis of the same sample revealed 57% of root canals had asymmetry of the root canal foramen. Agreement of stereomicroscopic and radiographic findings was found to be 61%. The most frequent deviation of the major foramen was on the distal root surface (29%), but this was not statistically significant. The mean distance between the deviation of the major foramen and the anatomical root apex was 0.99 mm. The study indicates that the clinician should consider deviation of the foramen during root canal treatment, as the deviation could not easily be detected radiographically.

Adolescent↗

PubMed1991

[Frequency and most common localisation of root canal curvature].

The root canal therapy of the curved canals is a complex operative procedure. Therefore 260 root canals were analysed radiologically to determine the frequency and the most common localisation of the root canal curvature. The frequency of the curved canals averaged at 59%, being greater in the sample of posterior than in the anterior teeth (p less than 0.05). The root canal curvature was most frequently localised at the apical third part (53.9%), followed by the cervical (33.3%) and the middle (12.8%) third part. The apical curvature was predominant in the sample of the anterior, while the cervical predominant (45.2%) in the sample of the posterior teeth. This study pointed out that the frequency of the curved canals is rather high. Consequently, the necessity for practising the modern root canal preparation techniques, bearing in mind their potential danger, is emphasized.

Dental Cavity Preparation↗

PubMed1991

[Contours of apical foramen observed stereomicroscopically].

Two hundred and sixty major apical foramina were examined stereomicroscopically to determine the contours of the apical foramen and the frequency of each shape. The observation was performed at 15 x magnification. During the examination the following shapes were observed: circle, ellipse, teardrop, number eight and irregular forms. Apical foramen most frequently had the circular shape and it was registrated in 58.8 per cent of the main root canal openings. The elliptic contour was presented in 22.7 per cent, the teardrop shape in 10.4 per cent and the shape similar to number eight occurred in 5.0 per cent of the samples. The statistical calculation revealed that the circular shape of the apical foramen is the most frequent finding (p less than 0.01). This finding seems to be optimistic in an attempt to perform the hermetic sealing of the apical foramen.

Dental Pulp Cavity↗

PubMed1990

[Frequency of apical, lateral and furcational accessory canals].

Two hundred and thirty permanent roots were examined stereomicroscopically to determine the frequency of apical, lateral and furcational accessory canals. The frequency of apical accessory canals averaged 19.6% and lateral 8.3%. The furcational accessory canals were observed in 32.0% of all furcations. These findings emphasize the necessity for undertaking the meticulous disinfection and qualitative obturation of endodontic space.

Dental Pulp Cavity↗