Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “ROOT CANAL OBTURATION”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,045 records · Page 58Linked to original sources
PubMed1989

[Access cavity preparation for mandibular incisors with suspected two canals].

One of the common reasons for endodontic failure is incomplete root canal obturation. According to previous studies, about 10-45% of all lower incisors have two canals. The purposes of this study were: 1. determine the incidence of double canals in the lower incisors among Chinese; 2. evaluate the usefulness of X rays for locating double canals in the lower incisors; and 3. propose a method of access cavity preparation for lower incisors when double canals are diagnosed. One hundred lower incisors were collected and checked by dental X ray, mesiodistally, buccolingually and at a 30 degrees mesial shift, in order to determine the incidence of double canals and evaluate their images on film. In addition, a method for drawing the pathway of the double canals from the apex to the incisal edge, as a reference for access cavity preparation, was proposed. The results of this study showed that 36 out of the 100 lower incisors had double canals and only two of them had two separate apical foramina. Clinically, when the X ray image of the lower incisor canal is obscure or missing at the middle third of the root, it is best to extend the access cavity to the incisal edge in order to find the lingual canal.

Dental Cavity Preparation↗
PubMed2003

[Periradicular surgery with and without endoscopy: a prospective clinical comparative study].

A total of 129 teeth with periradicular surgeries (apicoectomies) were analyzed in a prospective clinical study. In the test group including 62 teeth, an endoscope (Tele-Otoscope with a 70 degrees viewing angle) was used as an intraoperative visualization aid to monitor the following surgical steps: root-end resection, root-end cavity preparation and retrograde root-canal obturation. In the control group including 67 teeth, intraoperative diagnostics were carried out using micromirrors. Fifty-four and 61 teeth could be re-examined after one year. Based on the clinical and radiographic findings they were categorized as success, uncertain healing or failure. In the test group with endoscopy, the success rate was 88.9%, whereas in the control group it was only 75.4%. However, statistically no significant difference was found between the two groups. Additional experimental and clinical studies will show if endoscopy will improve the success rates in periradicular surgery any further.

Apicoectomy↗
PubMed2002

Electrical and dye leakage comparison of three root-end restorative materials.

OBJECTIVE: The purpose of this study was to assess three modern root-end restorative materials with electrical and dye leakage tests. METHOD AND MATERIALS: Thirty-three human canine teeth were prepared and filled with gutta-percha and sealer. Stainless steel rods were inserted into the root canals as anodes, and the teeth were varnished. The apical 3 mm of each tooth was resected, and 3-mm root-end preparations were made ultrasonically. Mineral trioxide aggregate, Super EBA, and IRM were used to restore 10 teeth each, and three teeth were varnished as controls. Following 24 hours' setting in blood, the specimens were placed in 1% potassium chloride electrolyte, and leakage was recorded electrically for 70 days. The teeth were then submerged in methylene blue dye for 72 hours, sectioned longitudinally, and scored for leakage by six examiners. RESULTS: In both tests, the mineral trioxide aggregate restorations leaked significantly less than the IRM and Super EBA restorations. Super EBA showed significantly less leakage than did IRM restorations in the electrochemical test but not in the dye leakage experiment. The teeth sealed with mineral trioxide aggregate performed similarly to the varnished negative control teeth. CONCLUSION: The results of this study indicated that mineral trioxide aggregate provides a superior seal in root-end-restorations.

Aluminum Compounds↗
PubMed1990

Apical closure of mature molar roots with the use of calcium hydroxide.

Calcium hydroxide may induce apical root closure in affected mature teeth as well as in immature teeth. Once an apical hard tissue barrier is formed, a permanent root canal filling can be safely condensed. Two cases are described in which calcium hydroxide induced apical root closure in mature molar teeth where the apical constriction was lost because of chronic inflammatory process.

Adult↗
PubMed2006

A comparison between the occluding effects of the Nd:YAG laser and the desensitising agent sensodyne on permeation through exposed dentinal tubules of endodontically treated teeth: an in vitro study.

OBJECTIVE: Dentine hypersensitivity may occur due to loss of covering enamel and/or loss of cementum after gingival recession, resulting in exposure of cervical dentine and patency of dentinal tubules. The effect of thermally cooled pulsed neodymium:yttrium-aluminium-garnet (Nd:YAG) laser on the permeability and structural appearance of the root canal wall was investigated in vitro. The aim of this study was to compare the occluding effect of Nd:YAG laser with that of sensodyne on exposed dentine. MATERIAL AND METHODS: Forty freshly extracted human maxillary anterior teeth were collected at random. Root canal obturations were performed using master apical file no. 60 k-type for obturated teeth. All teeth were stored in 100% humidity at 37 degrees C for 48h to allow time for the sealer to set. Dentine of 35 teeth was exposed by removing the cementum, and the remaining five teeth represented a negative control group. Specimens were examined using stereomicroscopy to show the surface topography of the dentine substrate before and after treatment with Nd:YAG laser or sensodyne. RESULTS: A double-blind technique was used when taking measurements of ink penetration (in mm) for each group. Teeth treated by Nd:YAG laser showed the least ink penetration, followed by teeth treated by sensodyne. The positive control group demonstrated complete ink penetration and the negative control group showed no ink penetration. Stereomicroscopic examination of specimens treated with Nd:YAG laser showed deposition on the dentinal surface, and specimens treated with sensodyne showed partial deposition. Untreated specimens were free of deposition and the tubules remained patent. CONCLUSION: There is no significant difference in the occluding effect of Nd:YAG laser and sensodyne toothpaste. Both treatments have a promising effect on the reduction of permeation through exposed dentinal tubules. However, the occluding effect of Nd:YAG laser occurs within seconds whereas that of sensodyne takes at least 3 weeks.

Analysis of Variance↗
PubMed2006

Intentional replantation of a mandibular molar: case report and 14-year follow-up.

This case report describes the nonsurgical endodontic treatment and intentional replantation of a mandibular molar and its nearly 14-year follow-up. A 56-year-old woman sought treatment with complaint of discomfort and sensitivity in the mandibular left area. The radiographic examination showed that the mandibular left first molar was endodontically treated, with over-instrumentation of the distal root and unsatisfactory obturation on the mesial root. A large periapical lesion was observed surrounding the roots. In view of the patient's limited interocclusal space and objection to undergo an apical surgery, intentional replantation was suggested as an alternative. The patient returned for clinical and radiographic follow-up at 15 days, 40 days, 6 months, 12 months, and once yearly thereafter. At the last visit, after 14 years, no painful symptomatology was reported, probing depth was no greater than 3 mm, the periradicular area had normal appearance and no evidence of root resorption or periapical lesion.

Dental Restoration Failure↗
PubMed1995

A scanning electron microscopic study of external root resorption in replanted dog teeth.

Root resorption after replantation of mature permanent dog incisors was examined by scanning electron microscopy. Three groups consisting of three extracted teeth each were kept in a saline solution for 5, 30, and 120 min before replantation. The first group was replanted with the pulp intact. The second and third groups were replanted after root canal filling by Calciobiotic Root Canal Sealer. After 90 days, the teeth were extracted and the apical root surfaces were examined. Severe inflammatory root resorption was observed in the first (intact pulp) group. For the root canal filled teeth, the degree of root resorption was observed to be much less in those kept in saline for 30 min than in those kept for 120 min.

Animals↗
PubMed1990

Radiographic evaluation of extruded obturation materials.

The radiographic appearance of filling material extruded into periradicular tissues during obturation of root canals was studied over time. Recall radiographs for up to 6 1/2 yr were compared with immediate postoperative films. Consistently, less material was evident at successive postoperative periods. This study indicated that given time, the two zinc oxide and eugenol-based sealers studied will be removed from periradicular tissues. It also indicated that sealer is removed from periradicular tissues more rapidly than gutta-percha.

Extravasation of Diagnostic and Therapeutic Materi↗
PubMed1989

Apical sealing efficacy of two reverse filling techniques versus cold-burnished Gutta-percha.

The apical seal produced by the cold-burnished gutta-percha method and two amalgam reverse filling techniques was investigated in an in vitro study using 36 extracted human single-rooted teeth. Following root canal obturation, 27 teeth were divided into three experimental groups and each group was subjected to one of the three following filling techniques: (a) cold-burnishing of gutta-percha; (b) amalgam reverse filling; and (c) amalgam reverse filling in conjunction with cavity varnish. The remaining nine teeth served as controls (4). The teeth were placed in methylene blue dye for a period of 1 wk, after which they were retrieved, washed, sectioned, and the apical dye penetration measured. The results showed that amalgam with cavity varnish demonstrated less dye penetration than the other experimental groups. The difference was statistically significant (p less than 0.0001).

Dental Amalgam↗
PubMed1999

Results of endodontic retreatment: a randomized clinical study comparing surgical and nonsurgical procedures.

Information of "success" rates after surgical or nonsurgical endodontic retreatment is abundant but inconclusive. Reported healing frequencies vary between 45% and 90%. The present study was designed to find any systematic difference between the methods. Nonsurgical and surgical retreatment was randomly assigned to 95 endodontically "failed" cases. The outcome of the procedures was clinically and radiographically recorded, and followed for 4 years. At the 12-month recall, a statistically significant (p < 0.05) higher healing rate was observed for cases surgically retreated. At the final 48-month examination, no such difference was found. These findings may be explained by (a) slower healing dynamics in the nonsurgical group and (b) the event of late "failures" in the surgical group. Within the latter category, four cases classified as healed after 1 yr failed at the final follow-up. Conclusively, this study failed to show any systematic difference in the outcome of surgical and nonsurgical endodontic retreatment. Surgical retreatment seems to result in more rapid periapical bone fill, but also may imply a higher risk of "late failures." From a scientific point of view, the length of the follow-up period is very important and may strongly influence the conclusions made.

Adolescent↗
PubMed2003

Perceived quality of radiographic images after rapid processing of D- and F-speed direct-exposure intraoral x-ray films.

OBJECTIVE: We sought to compare the densitometric properties and perceived image quality of InSight (F-speed) and Ultra-Speed (D-speed) film radiographs processed with rapid chemistry. The effects of density, contrast, and film speed on perceived image quality were also studied. STUDY DESIGN: Images were made of a human cadaver phantom with exposures to achieve background densities approximating 1.5, 2.0, and 3.0. Films were processed in a radiographic darkroom by using Insta-Neg and Insta-Fix rapid chemistry as the manufacturer had recommended. Five endodontic residents independently analyzed images of varying density, speed, and contrast that were presented in a randomized manner. They were required to evaluate the perceived image quality of 5 specifically designated areas on the film, using a labeled photograph as a guide. These areas included root canal obturation, periodontal ligament space, dentinoenamel junction, and crestal bone height. In addition, they were also asked to assess the overall perceived image quality. Statistical analysis consisted of ordinal regression and 2-factor analysis of variance. RESULTS: No statistically significant differences were proved between F- and D-speed radiographs within the same density group. Higher density and higher contrast resulted in a statistically significant positive impact (P <.01) on the ranking for all 5 subjective determinations. Observers preferred the films exposed to a background density of 3.0 over those of a lower density (P <.01). CONCLUSIONS: InSight (F-speed film) can be used with rapid chemistry to ensure less radiation exposure to patients than is necessary with D-speed film. The observers participating in this study preferred radiographs from the 3.0 background density group to those from the 2.0 and 1.5 density groups.

Absorptiometry, Photon↗
PubMed2003

Starvation survival, growth and recovery of Enterococcus faecalis in human serum.

The ability of Enterococcus faecalis to survive starvation for long periods in the obturated root canal is likely to be an important factor in the pathogenesis and maintenance of a persistent infection after endodontic treatment. The response of E. faecalis to starvation survival in water and glucose-, phosphate- or amino acid-limited chemically defined medium was studied, along with the capacity for growth and recovery of starved cells of E. faecalis in pooled human serum. After an initial rapid fall in cell numbers, a small remaining population of E. faecalis was able to survive in water for over 4 months and in nutrient-limited media for extended periods. A high cell density at the onset of starvation was critical for the ability of E. faecalis to endure prolonged nutrient limitation. Upon starvation, a static population of starved cells developed and were apparently in a minimal metabolic state, since blocking cell wall synthesis with penicillin G or inhibiting DNA synthesis with norfloxacin during starvation resulted in limited change in the rate of loss of viable cells. In 50% serum, E. faecalis grew, then stabilized at a relatively constant population of 106 colony-forming units/ml for 4 months, irrespective of the initial cell density. In summary, E. faecalis is capable of withstanding prolonged periods of starvation in a minimal metabolic state provided that there is a high cell density at the onset of starvation. Starved cells were capable of recovery upon addition of human serum.

Adaptation, Physiological↗
PubMed2002

The effect of intracanal Ledermix on root resorption of delayed-replanted monkey teeth.

Progressive root resorption is one of the common sequelae in replanted teeth, which is detrimental to their long-term prognosis. Ledermix paste, with its composition of triamcinolone acetonide and demethylclortetracycline, has been shown to inhibit inflammation and the associated hard tissue resorption. This study evaluated the effect of immediate intracanal Ledermix on root resorption of delayed-replanted monkey teeth. A total of 36 roots were root canal treated. For the experimental group, intracanal Ledermix was placed prior to extraction and replantation after 1-h bench dry. The positive control group was root filled and replanted after 1 h while the negative control group was root filled and replanted immediately. The monkeys were sacrificed after 12 weeks. The H&E histological tissue specimens were prepared and evaluated using a method modified from that of Andreasen's morphometric analysis, as favorable or complete healing and unfavorable healing, comprising inflammatory root resorption and replacement resorption. The results were analyzed using Kruskal-Wallis and Mann-Whitney U-tests as well as Wilcoxon signed ranks test. The negative control group produced highly significant favorable healing and unfavorable healing as compared to the Ledermix group (P = 0.000). The Ledermix group only showed significantly higher occurrence of complete healing (35.46%) compared to the positive control group (16.58%) (P = 0.037) but there were no significant differences in the inflammatory root resorption and replacement resorption. Nevertheless, when the latter two unfavorable healing patterns were combined, there was a significantly lower overall unfavorable healing in the Ledermix group (64.54%) when compared to the positive control group (83.43%) (P = 0.037). This unfavorable healing outcome in the Ledermix group, however, was not significantly different from the favorable healing outcome with the same treatment modality (P = 0.110).

Animals↗