Aim: The present study aimed to evaluate the effect of three various polishing agents on provisional restorative material on immersion in a staining solutions. Objectives: The objective of the study is (1) To evaluate the effect of pumice on staining characteristics of provisional restorative material before and after immersion in chlorhexidine. (2) To evaluate the effect of aluminum oxide paste on staining characteristics of provisional restorative material before and after immersion in chlorhexidine. (3) To evaluate the effect of diamond paste on staining characteristics of provisional restorative material before and after immersion in chlorhexidine. (4) To compare and assess the outcome of three polishing agents on staining characteristics of provisional restorative material. Materials and Methods: Sixty samples (10 mm × 2 mm) were fabricated of bis-acryl composites (Protemp™ 4) by utilizing a metal mold. The samples were grouped into three groups ( n = 20), and various polishing agents were used, including pumice, aluminum oxide paste, and diamond polishing paste. The samples that were not exposed to any polishing agent served as the control group. The samples were kept in a water bath for a day at 37°C and were stained with chlorhexidine mouthwash. The color of all specimens was measured with a spectrophotometer before and after polishing, and color changes (ΔE) were calculated. Results: By using one-way ANOVA, significant difference was found in mean color change in three polishing materials ( F = 4.44, P = 0.016). By using Tukey test, statistically significant difference was found among pumice and aluminum oxide paste ( P = 0.027), among pumice and diamond paste ( P = 0.041) and no significant difference was found among aluminum oxide paste and diamond paste ( P = 0.985). Conclusion: Pumice exhibited less staining which was statistically significant when compared with aluminum oxide paste and diamond paste. Hence, it can be considered the most efficient polishing agent.
A BSTRACT Background: Immersion media such as ophthalmic irrigation solution, eye lubricant solution, and neutral soap solution will be the best, which will help in the longevity as well as the color stability of ocular prostheses. Aim: The aim of this study was to evaluate and compare color stability of ocular prosthesis after immersion in three different immersion media. Materials and Methods: A total of 90 samples of scleral acrylic resin were prepared, which were painted with natural dry earth pigment NEAS and then were divided into three groups. These samples were checked before and after immersion in respective media after 8 weeks. To assess the color change, a spectrophotometry test was performed and the results were statistically analyzed by one-way analysis of variance and post hoc Tukey’s test. Results: Among all the three groups, the samples immersed in neutral soap solution proved to be most color stable, followed by eye lubricant solution, and the least color stable among the three was ophthalmic irrigating solution. Conclusion: The neutral soap solution proved to be the most color stable.
Occlusion and occlusal plane is the primary criteria in fabrication of posterior restorations. In natural dentition, curve of Spee allow the harmony between the anterior tooth and condylar guidance. The simplest method of establishment of occlusal plane is through use of Broadrick occlusal plane analyzer. This study aims to evaluate and compare the curve of spee in natural dentition using broadricks flag between male and females. To compare these study include 10 males and 10 females with completely dentate patients (Control group) and 10 males and 10 females with few missing posterior teeth (Study group). Interocclusal records were made and cast was articulated in semi adjustable articulator. Paired t test were used to compare the findings between subject and control groups. Results: -A statistically difference found between the study group and control group patients and deviation from broadrick curve was not found to be significant between male and female patients. KEYWORDS: Broadrick's flag, Curve of spee, Occlusal plane analyzer. INTRODUCTION:Occlusion and occlusion plane is the primary criteria in the fabrication of posterior restorations. Usually, the term, plane, is related to a flat surface. However this is not the case with the occlusal plane. Instead of a flat surface, the plane of occlusion represents the average curvature of the occlusal surface. The position of the anterior teeth is determined by the esthetics, the demand for anterior guidance, and phonetic considerations. Posterior teeth positions are defined by 2 curves, an anterioposterior curve, referred to as the curve of spee, and the mediolateral curve, referred to as the curve of Wilson. (1,2,3) In normal natural dentition, there exists an anteroposterior curve that passes through the cusp tip of the mandibular canine and the buccal cusp tip of the mandibular premolars and molars, and that extends in a posterior direction to pass through the most anterior point of the mandibular condyle, originally described by Ferdinand Graf Spee in 1890. (4,5) Spee located the center of the curve along "A horizontal line through the middle of the orbits behind the crista lachryma posterior". (5,6) Spee idea was advanced in 1920 by George Monson. (5) Monson proposed that the anteroposterior curve forms part of a 3 dimensional sphere, the Centre of rotation of which is located in the region of the glabella. (3,7) The radius of this curve is reported to be an estimated 4 inches (10.4cm), as proposed by monsoon. (3) The curve of spee may be pathologically altered in situations resulting from rotation, tipping, and extrusion of teeth. Restoration of the dentition to such an altered occlusal plane can introduce posterior protrusive interferences. Such interferences have been shown to cause abnormal activity in mandibular elevator muscles, especially the masseter and temporalis muscle. This can be avoided by reconstructing the curve of spee to pass through the mandibular condyle, which has been demonstrated to allow posterior disocclusion on mandibular ...
BACKGROUND The restoration of endodontically treated teeth is a challenge as these teeth loose significant part of the tooth structure due to caries, previous restorative procedures, endodontic access cavity preparation or due to loss of moisture supplied by dentin, which makes them weak. The restoration of such teeth is accomplished by using post and core, to prevent further destruction and to provide retention for the core, before a crown or a fixed partial denture can be placed. Post-retained crowns are indicated for endodontically treated teeth (ETT) with severely damaged coronal tissue. There are still controversies for the most suitable choice of restorative material and the placement method that will result in the highest success rate. This clinical study compares the para post, fiber post and ceramic post in the restoration of the endodontically treated teeth. We wanted to evaluate and compare the retentive properties of three different post systems used for endodontically treated teeth for providing restoration. METHODS Sixty extracted human, single rooted, caries free, non-fractured tooth were selected and disinfected using 2% chlorhexidine solution and subsequently stored in distilled water. Each group consists of 20 samples. The crown structures of teeth were separated from root at cemento-enamel junction. Canal was obturated with gutta-percha and endodontic sealer. The posts were coated with Selfcem and also the resin cement was transported into the canal by the lentulospiral. A custom made two-piece stainless-steel mould was used for fabrication of standard size resin blocks in which teeth specimens were mounted. After the complete curing of autopolymerising acrylic resin, after 30-45 minutes, the block was retrieved from the mould. The specimen with acrylic block was mounted on lower jaw of universal testing machine. The retentive strength was calculated as maximum tensile load that a sample can withstand post dislodgement. RESULTS Descriptive statistical analysis, one-way ANOVA, multiple comparison Tukey test were used. SPSS Ver. 16.0 was used for statistical analysis. Statistical analysis showed significant difference between the retentive strengths of all the three post systems (p<0.05). Group I: 259.17±27.37, Group II: 153.83±29.16, and group III: 118.40 ± 12.95. Paraposts showed highest retention followed by Fiberposts and then followed by Ceramic posts. CONCLUSIONS Prefabricated metal posts have the highest retention when compared with the other two post systems.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.