Apical and periapical repair of dogs' teeth with periapical lesions after endodontic treatment with different root canal sealers.
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The aim of this study was to evaluate the apical and periapical repair after root canal treatment of dogs' teeth with pulp necrosis and chronic periapical lesion using different root canal sealers. After periapical lesion induction, forty-four root canals of 3 dogs were submitted to biomechanical preparation using 5.25% sodium hypochlorite as an irrigating solution. A calcium hydroxide dressing (Calen PMCC) was applied for 15 days and the root canals were filled using the lateral condensation technique with gutta-percha points and Sealapex, AH Plus or Sealer Plus for sealing. After 180 days, the animals were sacrificed by anesthetic overdose and the obtained histological sections were stained with hematoxylin-eosin for optical microscopic analysis of the apical and periapical repair. The groups filled with Sealapex and AH Plus had better histological repair (p < 0.05) than the group filled with Sealer Plus, that had unsatisfactory results. (+info)
Histological study of the effect of some irrigating solutions on bacterial endotoxin in dogs.
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The aim of this study was to evaluate, histopathologically, the effectiveness of mechanical preparation of root canals using different irrigating solutions in dog teeth filled with LPS after pulpectomy. A total of 120 root canals of 6 mongrel dogs were filled with a solution of LPS after pulpectomy. The irrigating solutions used were saline, 1, 2.5, and 5% sodium hypochlorite, and 2% chlorhexidine. No irrigation was used in the control group. The animals were sacrificed after 60 days and the teeth were fixed and demineralized. Subsequently, serial 6-microm sections were stained with hematoxylin and eosin and Mallory's trichrome for histopathological analysis and Brown-Brenn for verification of bacterial contamination. Analysis showed that the inflammatory infiltrate was statistically less intense in the groups in which the root canals were irrigated with 5% sodium hypochlorite and 2% chlorhexidine. However, none of the irrigating solutions completely inactivated the harmful effects of LPS. Mechanical preparation associated with different irrigating solutions did not completely inactivate LPS. (+info)
A radiographic study of the relationship between technical quality of coronoradicular posts and periapical status in a Jordanian population.
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A radiographic study was conducted to investigate the relationship between the technical quality of coronoradicular posts and periapical status. A total of 400 periapical radiographs, including 560 posts, of patients attending the Dental Department at Jordan University Hospital were scanned and studied. It was found that maxillary teeth were more frequently restored with posts (65.36%) than mandibular teeth (34.64%). Tapered posts accounted for 73.93% of the posts used. The ratio of the mean post length to crown length was 0.8, and that to root length was 0.45. The mean length of the remaining gutta percha apical to the end of the post was 6.22 mm. In addition, 25% of the posts deviated from the line of the root canal. Periapical radiolucency was evident in 53.93% of the assessed teeth. It is concluded that inadequate root canal treatment and coronoradicular posts are associated with increased prevalence of periapical radiolucency, and that general dental practitioners should be better trained in performing endodontic treatment and restoring endodontically treated teeth. (+info)
An update in periapical surgery.
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Periapical surgery has largely improved at all levels due to new technologies provided by researchers throughout the last years. The aim of this article is to carry out a bibliographic revision of the last seven years. For this reason, we will analyse the studies published in Medline and the most important Spanish dental magazines. The subjects to investigate are mainly based on the incorporation of ultrasonic root-end, which allow the performance of small and adjusted retrograde cavities; as well as the new filling materials. We also include magnifying glasses or surgical microscope to the work material, plus surgical laser and the application of guided tissue regeneration. (+info)
Effects of root morphology on stress distribution at the root apex.
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It is thought that the stress concentration at the root apex caused by orthodontic force induces root resorption. The purpose of this study was to investigate stress distribution at the root in cases of deviated root shapes using finite element models (FEMs). To clarify this, five three-dimensional FEMs divided by deviated root shape (normal, short, blunt, bent root apex, pipette shape) were constructed and, experimental orthodontic forces, applied in a vertical (intrusive) and horizontal (lingual) direction to the tooth axis. In the short-root model, significant stress was concentrated at the middle of the root. The blunt-shaped root model showed no significant stress concentration at the root. In the models with a bent or pipette-shaped root, significant stress was concentrated at the root apex. During orthodontic force application, stress concentration was observed in the root of the models with short, bent, and pipette-shaped roots, indicating that attention must be paid to root shape during orthodontic treatment. (+info)
Incidence of mandibular nutrient canals in hypertensive patients: a radiographic study.
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Hypertension, also called a 'silent killer,' is one of the most common medical problems seen in our profession. A prospective study was conducted in the Department of Oral Medicine and Radiology to determine the incidence of the appearance of nutrient canals in the periapical radiographs of the mandibular anterior region of patients with high blood pressure. A total of 100 patients, between 10-80 years, were examined. After taking a proper history, systemic and oral examinations were done and the findings were recorded under two categories, hypertensive patients and normotensive patients. They were further subdivided according to their periodontal status. Intraoral periapical radiographs of the lower anterior region were then taken. Radiographs were interpreted with a good X-ray viewer and the use of a magnifying glass. Findings were recorded on a prepared format. (+info)
Characterization of the apical papilla and its residing stem cells from human immature permanent teeth: a pilot study.
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A comparative study of silver amalgam and compomer as retrograde filling materials in periapical surgery.
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OBJECTIVE: A comparative study is made of the histological effects of silver amalgam versus compomer (Dyract) 90 days after placement as retrograde filling materials in experimental animals. METHOD: Six Beagle dogs were used, with total pulpectomy and orthograde material filling followed by periapical surgery of the 6 upper and 6 lower incisors (for a total of 72 teeth). Thirty-six teeth corresponded to the right side and were filled with the control material (silver amalgam), while the 36 teeth on the left side were filled with the compomer study material (Dyract). After three months the animals were sacrificed and the histological study was carried out, with evaluation of bone formation, inflammation, and the tissue in contact with the filler material. The results obtained were subjected to a descriptive and comparative statistical analysis (chi-square test). RESULTS: The samples retrogradely filled with compomer showed significantly greater percentage inflammation (76.19% versus 26.66% in the control group). On the other hand, a large proportion of samples with root cement growth were found in the compomer group. Filler material expulsion was also significantly more common when compomer was used. CONCLUSIONS: the comparative study of the histological findings showed greater inflammation but also greater root cement growth in the compomer group versus the controls. (+info)