Evaluation of the pattern dimensions of cast-metal posts in uniradicular teeth (original) (raw)
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Radiographic analysis of 1000 cast posts in Sergipe state, Brazil
Revista de Odontologia da UNESP
Introduction Endodontically treated teeth with extensive coronary destruction require posts and cores to enable prosthetic restoration. Despite the increasing use of prefabricated posts, cast metal posts and cores are still widely used. The quality of the latter is important for the longevity of restorative treatment, and failure can occur if the fundamental principles are not followed. Objective To radiographically evaluate the prosthetic principles of 1000 cast metal post-and-core restorations performed in single-rooted teeth and their coherence with the principles used for their confection. Material and method Digital periapical radiographs of 1000 endodontically treated, single-rooted teeth with cast metal posts and cores were selected from the collection of a radiology clinic (Centro de Imagem, Aracaju/SE, Brazil). The images were analyzed using a measurement software (ImageJ, USA) in accordance with the fundamental prosthetic principles: length and diameter of the post, ratio ...
SciDoc Publishers, 2020
A post and core crown is a type of dental restoration required where there is an inadequate amount of sound tooth tissue remaining to retain a conventional crown. A post is cemented into a prepared root canal, which retains a core restoration, which retains the final crown. Aim of the study is to assess the number of prefabricated metal posts placed in mandibular molars with two or more walls present. A Retrospective study was conducted using the records of the patients. Overall, 283 case sheets were reviewed which were dated between june 2019 to march 2020. The data was collected by the patient records of Saveetha Dental College and Hospitals. Data was recorded in Microsoft excel and later exported to IBM SPSS (version 20.0 Chicago USA) and subjected to Statistical analysis Data consisted of all the patients who underwent restorative procedure and opted for post and core with a total of 285 patients were analysed. Association between the number of walls present and the gender of the patient revealed that male patients with two walls present had the highest number of prefabricated metal post (29.72%) and the least being in the patients having 4 walls with 1.75% among males(Pearson's chi square test value-125.7, p<0.005), statistically significant. More numbers of prefabricated metal posts were diagnosed in the age group of 51-70years with 2walls (18.86%), 3 walls (15.73%) and 4 walls(1.75%), however it was statistically significant. (Pearson Chi square Test :125.7, P<0.05). Most frequent anatomical site in which prefabricated metal post was seen in 36 with 2walls (16.43%) and 3 walls (15.73%) followed by 46 with 2 walls (15.73%), 3 walls (11.89%) and 4 walls (4.55%).The least number of prefabricated metal post with 2walls(9.79%), 3 walls (5.59%) and 4 walls(1.05%) was 47. Based on Chi square test, it was statistically significant (Pearson Chi square Test :17.25, P<0.05). Within the limitations of the study, it can be concluded that prefabricated metal posts are the most preferred posts in posterior teeth, due to its rigidity and strength greater than dentin.
Journal of Dentistry, 2010
The aim of this retrospective study was to compare the cumulative survival rate of teeth restored with prefabricated posts and with cobalt-chrome cast post-cores. Methods: 112 endodontically treated teeth restored with prefabricated post and cobaltchrome cast post-and-cores were evaluated. Teeth were considered as failures when were objective or radiologic sign of endodontic failure, post or root fracture, or when they had been extracted at the moment of the evaluation. Kaplan-Meier's method was used to reconstruct the survival curves of the restorations and to test the variable type of postand-core restoration. Results: 93 of the posts were still in function without clinical or radiographic signs of failure at the time of the examination resulting in a survival rate of 83.03% after a mean follow-up period of 10.08 years. When comparing the two techniques, prefabricated posts showed a slightly higher survival rate: 84.6% versus 82.6%.Focusing on tooth-type, maxillary premolars (n = 30) had the highest failure rate (30%) and also the lowest mean lifetime, with 6-anda-half years. Maxillary incisors (n = 20) showed the highest success rate (5%) with only one case of failure. Conclusions: The results showed no significant difference between both groups after a 10-year average follow-up.
Fracture resistance of teeth restored with cast post and core: An in vitro study
Journal of Pharmacy and Bioallied Sciences, 2012
T he size and shape of the post and core, the final preparation design of the tooth, and the kind of luting agent used influence tooth resistance to fracture. [1,2] The custom-made post is the time-proven method for post and core construction. When properly designed, the custom-made post can conform to a canal of any shape to provide maximum retention and allow a more even distribution of stresses throughout the tooth structure. [3,4] A dental ferrule is an encircling band of cast metal around the coronal surface of the tooth as part of the core or artificial crown and may be of benefit in reinforcing root filled teeth. A protective or "ferrule effect" could occur owing to the ferrule resisting stresses such as functional lever forces, the wedging effect of tapered posts, and the lateral forces exerted during the post insertion. [5] All posts, to a greater or lesser extent, gain their final retention by cementation into the prepared root canal. Studies have provided conflicting results in relation to the adequacy of different types of cement to retain dental posts. [6-8] The mechanical properties of the cement, the bonding efficiency of the cement to the two surfaces being joined, the durability of the cement, and the configuration of the post and the prepared canal have a direct bearing of the ability of cements to retain posts. The purpose of the present study was to evaluate fracture resistance in teeth restored with cast posts and cores with and without cervical ferrule and cemented with three types of cements, viz., zinc phosphate, glass ionomer, and resin cements. Materials and Methods Sixty single-rooted maxillary first premolars of similar sizes were selected which were removed for periodontal and orthodontic reasons free of caries, calculus, and fractures. The teeth were cleaned of debris, calculus, and any periodontal ligament remnants, and stored in normal saline at room temperature. The crowns were horizontally sectioned using sectioning disks and the lengths of the teeth were standardized to 16 mm. The endodontic treatment followed the step back technique. The canals were instrumented with K-files and H-file under irrigation with 5.25% sodium hypochlorite, 17%
Research, Society and Development, 2021
This randomized clinical trial evaluated the influence of the type of intraradicular posts (glass fiber post or cast metal post) in the success of endodontic treatment in teeth that received single metal-ceramic restoration. The sample consisted of adult patients, who presented for the first time seeking routine dental care at the dental school over a period of 5 years. Seventy-six out of ninety-six teeth that received endodontic treatment and intraradicular post were analyzed, randomly distributed in two groups – glass fiber post (n=38), and cast metal post (n=38). The quality of the endodontic treatment was radiographically evaluated, and the apical status was assessed using the periapical index (PAI). Statistical Analyses were performed to a significance level of 5%. Descriptive analyses were used to characterize the teeth and survival curves were created using the Kaplan–Meier method. The success rate of endodontic treatment was 90.8% (n=69) including glass fiber post and cast p...
Dental Press Endodontics, 2011
Objectives: This study evaluated the effect caused by intracanal posts (ICP) on the dimensions of cone beam computed tomography (CBCT) images of endodontically treated teeth. Methods: Forty-five human maxillary anterior teeth were divided into 5 groups: Glass-Fiber Post ® , Carbon Fiber Root Canal ® , Prefabricated Post-Metal Screws ® , Silver Alloy Post ® and Gold Alloy Post ®. The root canals were prepared and filled; after that, the gutta-percha filling was removed, and the ICP space was prepared. The post cementation material was resin cement. CBCT scans were acquired, and the specimens were sectioned in axial, sagittal and coronal planes. The measures of ICP were obtained using different 3D planes and thicknesses to determine the discrepancy between the original ICP measurements and the CBCT scan measurements. Results: One-way analysis of variance, Tukey and Kruskall-Wallis tests were used for statistical analyses. The significance level was set at α = 5%. CBCT scan ICP measurements were from 7.7% to 100% different from corresponding actual dimensions. Conclusion: Gold alloy and silver alloy posts had greater variations (p>0.05) than glass fiber, carbon fiber and metal posts (p<0.05). Gold alloy and silver alloy post dimensions were greater on CBCT scans than on original specimens.