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Results for “Retrograde Obturation”

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At least 19 recordsLinked to original sources
PubMedDate not supplied

[Use of thermoplasticized gutta-percha in retrograde obturation].

In 29 teeth, apicoectomies with retrograde instrumentation and retrofilling with low temperature thermoplasticized gutta-percha were performed. Nineteen of them were clinically an radiographically evaluated, showing the following average rate: successes 84.2% (16 cases), failures 10.5% (2 cases) and incomplete healing 5.2% (1 case). The observation period varied from 12 to 41 months. The use of retrograde instrumentation an retrofilling with thermoplasticized gutta-percha is suggested as a useful method in surgical procedures.

Apicoectomy↗
PubMed1991

[Prototype of an instrument for retrograde obturation].

Several instruments to carry and put the silver amalgam into de apical foramen for it's posterior condensation without spreading this material over the periodontal tissues, bone and adyacent mucosa, has been designed along the years. This article describes an easier and cheaper way to make an endodontic amalgam carrier by the adaptation between en 18 and 22 mm intravenous catheters into disposable syringes by the use of autopolymerizable acrilic, given the dentist the option of making a very easy instrument, at a low cost which can be used as a commercial endodontic amalgam carrier as well.

Acrylic Resins↗
PubMedDate not supplied

[Nonsurgical retreatment of lateral radiopacity after surgical treatment].

A case report is presented of an upper central incisor with incomplete endodontic procedure evidencing a radiolucent image that was treated by apicoectomy and retroamalgam. A year later the periapical lesion had healed completely but a new lateral radiolucency is observed. A reentry of the canal is performed eliminating the old obturating material, biomechanical preparation and obturation with sealer and thermo gutta-percha. The lesion was cured in nine months.

Adult↗
PubMed1991

Relation of pre- and intraoperative factors to prognosis of posterior apical surgery.

The relation of preoperative and intraoperative factors to the prognosis of apical surgery was studied in 136 premolar and molar roots. The evaluated factors were: clinical signs and symptoms, size of the periapical lesion, root canal obturation, tooth restoration, apical retrofilling, and the operating surgeon. A significantly higher success rate was found in roots obturated 2 mm or shorter of the apex, in roots without post restoration, and after retrofilling of roots with apparently well-condensed obturation. The prognosis differed significantly following treatment by various operators but was unrelated to their experience.

Apicoectomy↗
PubMed1992

A case of progressive external root resorption treated with surgical exposure and composite restoration.

Progressive external, root resorption was observed apical to the alveolar crest on the buccal surface of a tooth. The area of root resorption was surgically exposed. To gain access to the root resorption cavity osteoectomy was performed. The soft tissue in the resorption cavity was removed and a composite filling (Retroplast) was placed in the cavity using a dentine bonding system (Gluma). The pulp was removed and the root canal was obturated with gutta-percha points and root canal sealer (AH26). Eight months after treatment no further root resorption was observed. Increased pocket depth and slight bleeding on probing in the area of resorption were evident.

Bicuspid↗
PubMed1991

An analysis of success and failure of apicoectomies.

The radiographs from 715 patient charts were analyzed to study the effect of 11 factors on the success and failure of apicoectomies. Of these, 424 had recall radiographs of 6 months or more and were evaluated for changes in radiolucencies. The data were analyzed by cross-tabulation and chi-square analysis for significant relationships. Complete healing was found in 65% of the recall cases, while incomplete and unsatisfactory healing occurred in 29.4% and 5.6% of the cases, respectively. Complete healing was found to increase with patient age. Those over 60 yr of age had the highest percentage of complete healing. No statistical difference in healing was found between maxillary and mandibular teeth. Also, postsurgical healing associated with those teeth which were inadequately obturated with gutta-percha, silver points, or paste-filling materials did not differ significantly. No significant difference in healing was found between the teeth that were retreated nonsurgically before surgery and those that were not. Healing was independent of the placement of a retrofilling as well as the type of retrofilling period. Significantly better healing was seen with teeth that were permanently restored following surgery.

Adolescent↗
PubMed1992

Scanning electron microscopic study of the apical dentine surfaces lased with ND:YAG laser following apicectomy and retrofill.

The purpose of this investigation was to study the effects of a Nd:YAG laser on the cut surface of teeth using scanning electron microscopy (SEM). Eighteen single-rooted teeth were cleaned, shaped, and obturated with gutta-percha and root canal sealer. The apical 3 mm of each tooth were resected with a diamond fissure bur, and the teeth were randomly divided into two groups of nine teeth each. The resected surface of each root in one group was lased twice. The duration of lasing and the number of pulses were recorded for each tooth. The teeth were air dried, mounted on stubs, sputter-coated with gold-palladium and examined under SEM. Application of the Nd:YAG laser caused melting of apical dentine surfaces. The melted material resembled the appearance of glazed interconnected droplets. Resolidification and recrystalization of the melted areas appeared to be incomplete and discontinuous. Some areas between the glazed regions appeared similar to those of non-lased apical dentine resected root surfaces.

Apicoectomy↗
PubMed1991

A 24-week study of the microleakage of four retrofilling materials using a fluid filtration method.

The microleakage after retrofillings of amalgam, amalgam with cavity varnish, silver-containing glass ionomer cement, and intermediate restorative material was compared in vitro. Thirty-six extracted human incisors and canines were instrumented, obturated with gutta-percha without sealer, subjected to apicoectomy, and retrofilled with the materials described above. After removal of the gutta-percha filling, the microleakage from both directions (apically and coronally) was measured quantitatively and longitudinally for 24 wk after filling by a fluid filtration technique. All four retrofilling materials revealed some apical and coronal leakage at all time periods. The amalgam group showed statistically significant (p less than 0.001) apical leakage at 1.5 h. The use of cavity varnish significantly reduced the apical leakage of the amalgam group at 1.5 h. The silver-containing glass ionomer cement and intermediate restorative material groups showed significantly (p less than 0.05) less coronal leakage compared with the amalgam group at 1.5 h. Scanning electron microscopy of selected samples showed marginal defects of approximately 5 microns between the root dentin and the retrofilling material.

Cermet Cements↗
PubMed1992

Effects of Nd:YAG laser on apical seal of teeth after apicoectomy and retrofill.

The application of Nd:YAG laser to tooth surface can change its surface permeability. The purpose of this study was to investigate the effects of Nd:YAG laser on the permeability of dentin following apicoectomy and retrofill. Sixty single-rooted teeth were randomly assigned to six groups of 10 teeth each. The six groups were arranged in three pairs, experimental and control groups. The canals of teeth in pairs 1 and 2 were cleaned, shaped, obturated, and their apical 2 mm were resected. A class I preparation was prepared and filled with amalgam in each tooth in pair 1. The apical 2 mm of each tooth in pair 3 was removed, and a class I preparation was prepared and filled with amalgam. The apical surface of resected roots in half of the samples in each pair was lased twice by using Nd:YAG laser. The duration of lasing and the number of pulses were recorded for each tooth. After application of nail polish to the unoperated surface of each tooth, the teeth were placed in 0.5% methylene blue dye for 48 h. The amount of dye penetration in sagittal sections of each tooth was measured. The amount of dye penetration was significantly lower in lased roots than in nonlased ones (p < 0.05). Based on our results, it appears that application of Nd:YAG laser reduces the permeability of resected roots.

Analysis of Variance↗
PubMed1992

Tissue response following CO2 laser application in apical surgery: light microscopic assessment in dogs.

The potential advantages of CO2 laser in apical surgery have not been established histologically. Therefore, the long-term effects of CO2 laser on the apical and periapical tissues were examined histologically in dogs 6 months after apical surgery. Lased specimens and unlased controls showed periapical inflammatory and osteogenic reactions. Lased root surfaces revealed craters with a superficial charred layer closely associated with new cementum-like matrix. The subjacent dentin appeared tubule-free and eosinophilic. Lased bone trabeculae showed a charred layer with a deeper osteocyte-free zone. The charred layer was covered by new bone. Detached charred segments in the marrow space and periapical inflammatory infiltrate were intimately associated with multinucleated giant cells, some containing minute char particles. Such cells were absent from the root and trabecular char linings. In addition, the charred surfaces were free of hard tissue resorption. These results suggest that CO2 laser does not hinder healing when applied in apical surgery.

Alveolar Process↗
PubMed1975

Comparison of apical sealing methods. A preliminary report.

A comparison of the seal provided by gutta-percha root canal filling, heat-sealed gutta-percha, retrograde amalgam filling, and retrograde Durelon filling was made by observation of dye penetration around the above filling materials in extracted teeth. A small but not significant difference between gutta-percha, heat-sealed gutta-percha, and retrograde amalgam was noted. Retrograde Durelon filling gave a poor seal in comparison to gutta-percha and retrograde amalgam filling, but the difference between it and the heat seal was not significant.

Apicoectomy↗
PubMed1976

Sealing quality of polycarboxylate cements when compared to amalgam as retrofilling material.

Four hundred roots were uniformly prepared for retrofilling. One hundred of these were retrofilled with amalgam and served as controls for the study. The polycarboxylate cements--Durelon, PCA, and Poly C--were each used as retro-filling material for 100 roots. After immersion in 2 per cent aqueous methylene blue for 7 days, the roots were sectioned in 1 to 2 mm. increments to determine the depth of dye penetration. The depth of dye penetration was used as a measure of their sealing effectiveness. The groups were compared statistically by means of a t test. All cements were significantly different from amalgam. All cements performed inferiorly to amalgam, an already accepted retrofilling material.

Acrylates↗
PubMed1977

Retrograde root filling with amalgam and Cavit.

In a 3-year review of 218 teeth with retrograde root filling with amalgam orCavit, the results obtained with the former proved significantly better than those obtained with the latter. The difference seemed to be due to a better obliteration of the canal by amalgam. The obliterating effect of amalgam probably eliminates the need for revision of incomplete othograde root filling, for example, in cases with a post in the root canal. Irrespective of type of filling materials, the results were less good in cases with marginal bone loss.

Alveolar Process↗
PubMed1978

A comparative sealability study of different retrofilling materials.

The purpose of the study was to compare the sealing properties of Cavit and zinc polycarboxylate cement with silver amalgam when used as retrofilling materials of root canals. The retrofilling materials were placed at the apices of dogs' teeth and were left there for a 6-month period, after which time the teeth were extracted and the marginal leakage was evaluated by C14-labeled urea. A second part of the study included an in vitro placement of the retrofillings. Previously extracted teeth were used and the same retrofilling materials were placed. They were left to set for 2 days in physiologic saline solution. Then the same evaluation for leakage was used. The purpose of the second part was to compare and evaluate the effect of aging on sealability. Under the conditions of this study, amalgam afforded a better seal in the 6-month group than polycarboxylate cement or Cavit. Both Cavit and polycarboxylate cement showed more leakage in the 6-month group. The deterioration of the seal afforded by Cavit in the 6-month group was statistically significant. The seal of amalgam was the only one which was improved by time.

Acrylic Resins↗