Comparative Study of Different Materials for Occlusal Matrix Technique in Posterior Teeth

2016 ◽  
Vol 695 ◽  
pp. 50-54
Author(s):  
Adriana Maria Monea ◽  
K. Ivacson A. Csinszka ◽  
Bukhari Csilla ◽  
Gabriela Bereșescu
Keyword(s):  
Dental Materials ◽  
Acrylic Resin ◽  
Ease Of Use ◽  
Resin Cement ◽  
Occlusal Surface ◽  
Posterior Teeth ◽  
Surface Anatomy ◽  
Carious Lesions ◽  
Occlusal Surfaces ◽  
Component Material

Posterior composite restorations are difficult to contour and polish due to their occlusal anatomy and opposing occlusion. Our study describes a technique for duplicating occlusal surface anatomy, using different dental materials that are able to copy anatomic details. The aim of the study was to evaluate the efficiency of occlusal matrix technique, by comparing technical ease of different dental materials. The study was conducted on extracted teeth which had intact occlusal surfaces or initial carious lesions at this level. An impression of the occlusal surface was made prior to cavity preparation, with four different dental materials: a flow composite, a dual-cure resin cement, a temporary acrylic resin (powder and liquid) and a temporary crown and bridge two-component material in a Unidose®. When the last layer of composite has been placed, the occlusal matrix was forced into the uncured composite to replicate the original occlusal surface, instead of performing manual curing and shaping as in the standard approach. Time needed for complete finishing the case, the hardness of each occlusal matrix and the final morphology obtained were evaluated. The main benefits of the occlusal matrix technique are the technical ease of use due to its simplicity and its high accuracy in reconstructing occlusal morphology. Although the shortest time needed for occlusal matrix preparation was for the dual-cure resin cement, the best oclusssal matrix was obtained with the temporary acrylic resin (powder and liquid).

Finite Element Analysis of Provisional Structures of Implant-Supported Complete Prostheses

2014 ◽  
Vol 40 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Bruno Albuquerque Carneiro ◽  
Rui Barbosa de Brito ◽  
Fabiana Mantovani Gomes França
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Axial Loading ◽  
Acrylic Resin ◽  
Safe Procedure ◽  
Element Analysis ◽  
Posterior Teeth ◽  
Occlusal Surfaces ◽  
Three Dimensional Finite Element

The use of provisional resin implant-supported complete dentures is a fast and safe procedure to restore mastication and esthetics of patients soon after surgery and during the adaptation phase to the new denture. This study assessed stress distribution of provisional implant-supported fixed dentures and the all-on-4 concept using self-curing acrylic resin (Tempron) and bis-acrylic resin (Luxatemp) to simulate functional loads through the three-dimensional finite element method. Solidworks software was used to build three-dimensional models using acrylic resin (Tempron, model A) and bis-acrylic resin (Luxatemp, model B) for denture captions. Two loading patterns were applied on each model: (1) right unilateral axial loading of 150 N on the occlusal surfaces of posterior teeth and (2) oblique loading vector of 150 N at 45°. The results showed that higher stress was found on the bone crest below oblique load application with a maximum value of 187.57 MPa on model A and 167.45 MPa on model B. It was concluded that model B improved stress distribution on the denture compared with model A.

scholarly journals Specifics of proximal caries and their diagnostics in posterior teeth

2015 ◽  
Vol 28 (2) ◽  
pp. 92-96 ◽  
Author(s):  
Ilona Wojcik-Checinska ◽  
Agnieszka Mojsym ◽  
Agnieszka Loj-Maczulska ◽  
Renata Chalas
Keyword(s):  
Current Literature ◽  
Early Stage ◽  
Diagnostic Methods ◽  
Caries Risk ◽  
Posterior Teeth ◽  
Proximal Caries ◽  
Advanced Technologies ◽  
Carious Lesions ◽  
Occlusal Surfaces ◽  
Carious Process

Abstract Proximal surfaces are the second in turn after the occlusal surfaces, as being the most exposed places to the carious process. The specificity of changes and location makes the diagnostic of approximal cavities difficult. The aim of the study was to collect information on possibilities of detection, monitoring and assessment of carious lesions located on proximal surfaces, starting from the early stage. On the base of current literature, chosen methods of diagnosis, from conventional, to advanced technologies were presented. Current literature also suggests that none of the diagnostic methods exclude the possibility of misdiagnosis of proximal caries. Therefore, during the diagnosing of doubtful cases, it is advisable to employ several methods of assessment, with simultaneous individual appraisal of caries risk factors, such as oral hygiene, frequency of eating sweets or the number of active caries foci.

scholarly journals The The effect of different solutions and thermocycling on the vickers hardness of acrylic resin denture teeth

2018 ◽  
Vol 8 (3) ◽  
pp. 117-122
Author(s):  
Hatice Özdemir ◽  
Zeynep Yeşil Duymuş
Keyword(s):  
Thermal Cycling ◽  
Vickers Hardness ◽  
Artificial Saliva ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Denture Teeth ◽  
Occlusal Surfaces ◽  
Disinfectant Solution

Aim: The aim of this study was to evaluate the effect of artificial saliva, disinfectant solution, distile water and thermocycling on Vickers hardness of 4 commercial brands of acrylic resin denture teeth. Methodology: Four different brands of acrylic resin denture teeth (Major Dent, Acry Lux, Acry Rock, Imident Lux) were evaluated. 15 anterior and 15 posterior teeth of each group embedded in autopolymerized acrylic resin.  The occlusal surfaces of posterior teeth and the vestibule surfaces of anterior teeth were flattened by using silicone carbid paper. After polishing, microhardness measurements were repeated three times for each teeth. The teeth were submitted to different conditions: (1) storage in distilled water at 37±2°C for 7 days; (2) storage in artificial saliva at 37±2°C for 30 days and (3) storage in 1 % sodium hypochlorite. After, thermal cycling between 5 and 55 °C for 2500 cycles was made. The microhardness measurements were repeated. Data were analyzed with one-way analysis of variance (ANOVA) and Duncan test ( p<0.05). Results: There was statistical significant differences between initial and final microhardness values of different barnds of acrylic resin denture teet. Anterior teeth showed lower microhardness values than posterior teeth. Conclusion: Storage in different solutions and thermal cycling significantly reduced the Vickers hardness of the acrylic resin denture teeth.

scholarly journals Photoelastic Study of the Effects of Occlusal Surface Morphology on Tooth Apical Stress from Vertical Bite Forces

2004 ◽  
Vol 5 (1) ◽  
pp. 74-93 ◽  
Author(s):  
Mei-Qing Wang ◽  
Min Zhang ◽  
Jun-Hua Zhang
Keyword(s):  
Surface Morphology ◽  
Occlusal Surface ◽  
Posterior Teeth ◽  
Occlusal Contact ◽  
Test Assembly ◽  
Photoelastic Study ◽  
Normal Occlusion ◽  
Occlusal Surfaces ◽  
Mandibular Teeth ◽  
Relationship Of

Abstract The aim of the study was to determine how the morphology of occlusal surfaces might affect occlusal loading that is transferred to the tooth apex. Photoelastic methods were used to assess apical stress generated by seven variations of occlusions. A test assembly with a 2 kg weight was applied to teeth to create a vertical load. By analyzing the direction and magnitude of the apical principle stress under the polar light that was measured at the apexes of mandibular teeth, the occlusal loading position of each tooth and its direction was obtained based on general mechanical principles. It was found distal incline planes (or slopes) of cusps and lingual incline planes (or slope) of buccal cusps of mandibular posterior teeth carried the greatest occlusal load in normal occlusion. In the other six variations of occlusion presented in this study, the principle apical stresses changed more or less as a result of the different occlusal contact relationships. The magnitude of principle apical stress increased considerably in the flat surface occlusion because of the lack of distribution of occlusion loading by the smooth dentition surface. It is concluded the occlusal surface morphology has a significant effect on the direction and magnitude of apical stress. To establish a suitable relationship of occlusion that can conduct favorable occlusal loading physiologically is very important. Citation Wang M, Zhang M, Zhang J. Photoelastic Study of the Effects of Occlusal Surface Morphology on Tooth Apical Stress from Vertical Bite Forces . J Contemp Dent Pract 2004 February;(5)1:074-093.

Prototyping artificial jaws for the robotic dental testing simulator

2008 ◽  
Vol 222 (8) ◽  
pp. 1209-1220 ◽  
Author(s):  
K Alemzadeh ◽  
D Raabe
Keyword(s):  
Degrees Of Freedom ◽  
Force Transducer ◽  
Resin Cement ◽  
Posterior Teeth ◽  
Occlusal Contact ◽  
Six Degrees Of Freedom ◽  
Lower Jaw ◽  
Normal Occlusion ◽  
Occlusal Surfaces ◽  
Artificial Teeth

This paper presents a robot periphery prototyped for the six-degrees-of-freedom robotic dental testing simulator, simulating the wear of materials on dental components, such as individual teeth, crowns, bridges, or a full set of teeth. The robot periphery consists of the artificial jaws and compliance module. The jaws have been reverse engineered and represent a human-like mandible and maxilla with artificial teeth. Each clinically fabricated tooth consists of a crown and glass ceramic roots which are connected using resin cement. Normal clinical occlusion of the artificial jaws assembly was emulated by a dental articulator based on ‘Andrew's six keys to occlusion’. The radii of the von Spee curve, the Monson curve, and the Wilson curve were also measured as important jaw characteristic indicators to aid normal occlusion. A compliance module had to be built between the lower jaw and the robot platform to sustain the fluctuating forces that occur during normal chewing in the occlusal contact areas, where these high bite forces are major causes of dental component failure. A strain gauge force transducer has been integrated into the machined lower jaw, underneath the second molars, to measure axial biting forces applied to the posterior teeth. The experiments conducted have shown that the sensor is able to sense small changes in the compression force satisfactorily, when applied perpendicular to the occlusal surfaces of the teeth.

The Minimally Invasive Management of Early Occlusal Caries: A Practical Guide

2014 ◽  
Vol 3 (2) ◽  
pp. 34-41 ◽  
Author(s):  
Louis Mackenzie ◽  
Avijit Banerjee
Keyword(s):  
Minimally Invasive ◽  
Operative Management ◽  
Dental Amalgam ◽  
Occlusal Caries ◽  
Management Options ◽  
Posterior Teeth ◽  
Carious Lesions ◽  
Occlusal Surfaces ◽  
Wide Range ◽  
Invasive Management

Pits and fissures on the occlusal surfaces of posterior teeth are sites affected commonly by demineralisation caused by the caries process. Clinicians face daily challenges in detecting these lesions, accurately diagnosing their activity and choosing from a range of management options. Traditionally, the detection of an active (or potentially active) occlusal lesion invariably resulted in the preparation of a standardised occlusal cavity, often extending beyond the confines of diseased tissue, followed by the insertion of a direct restorative material, most commonly dental amalgam. The overwhelming weight of contemporary evidence now favours minimally invasive (MI) operative management when required (usually after non-operative prevention has failed), and a wide range of equipment, materials and operative techniques is available to help operators to preserve the maximum amount of healthy/repairable tooth tissue and to allow restoration with more biologically respectful, tooth-preserving materials. This paper aims to provide clinicians with practical guidance in the prevention, early detection, predictable diagnosis and minimally invasive management of early occlusal carious lesions.

scholarly journals Hardness and Surface Roughness of Enamel and Base Layers of Resin Denture Teeth after Long-term repeated Chemical Disinfection

2015 ◽  
Vol 16 (1) ◽  
pp. 54-60 ◽  
Author(s):  
Karin Hermana Neppelenbroek ◽  
Luciana Ayumi Kurokawa ◽  
Andréa Lemos Falcão Procópio ◽  
Thiago Amadei Pegoraro ◽  
Juliana Hotta ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Acrylic Resin ◽  
Distilled Water ◽  
Posterior Teeth ◽  
Denture Teeth ◽  
Occlusal Surfaces ◽  
Artificial Teeth ◽  
Denture Cleansers ◽  
Chemical Disinfection

ABSTRACT Aim To evaluate the effect of successive cycles of disinfection in different denture cleansers on the surface roughness and the Vickers hardness of two layers of acrylic resin (base-BL and enamel-EL) of two commercial cross-linked artificial teeth. Materials and methods The occlusal surfaces of 60 acrylic resin denture posterior teeth (Trilux-TLX and SR Orthosit PE-SRO) embedded in autopolymerizing acrylic resin were ground flat with 1200-grit silicon carbide paper. Specimens were stored in distilled water at 37°C and then submitted to the microhardness (VHN) and roughness (ìm) tests. Specimens were stored in distilled water at 37°C for 90 days and submitted to 720 disinfection cycles in sodium hypochlorite at 0.5%, 30% vinegar solution or distilled water (control). Afterward, microhardness and roughness tests were again performed. Data were analyzed using two-way ANOVA and Tukey's test (α = 0.05). Results Hypochlorite immersion decreased the hardness of BL and EL of SRO teeth, with an average reduction of 10.11% (p < 0.008). TLX teeth demonstrated a hardness reduction of 28.96% of both layers for all solutions including water (p < 0.0000). The roughness of both teeth was not affected by denture cleansers (p > 0.37). Conclusion Hypochlorite promoted deleterious effects on the hardness of both layers of the artificial teeth tested. Immersion in vinegar and water also resulted in reduction of hardness of TLX teeth. Clinical significance The surface hardness of the different layers of cross-linked artificial teeth can be altered by daily disinfection in denture cleansers commonly indicated for removable dentures. How to cite this article Neppelenbroek KH, Kurokawa LA, Procópio ALF, Pegoraro TA, Hotta J, Lima JFM, Urban VM. Hardness and Surface Roughness of Enamel and Base Layers of Resin Denture Teeth after Long-term repeated Chemical Disinfection. J Contemp Dent Pract 2015;16(1):54-60.

scholarly journals Evaluation of diagnosis accuracy in minimal carious lesions

2002 ◽  
Vol 49 (1-2) ◽  
pp. 7-13 ◽  
Author(s):  
Vesna Zivojinovic ◽  
Dejan Markovic
Keyword(s):  
Treatment Decisions ◽  
Histological Diagnosis ◽  
Laser Fluorescence ◽  
Occlusal Surface ◽  
Correct Treatment ◽  
Carious Lesions ◽  
Occlusal Surfaces ◽  
Diagnosis Accuracy

The aim of this study was to assess the accuracy of visual-tactile inspection (VTI) and laser fluorescence (LF) in detection of initial carious lesions on occlusal surfaces. Total of 120 premolars and molars, without any macroscopic cavitation on occlusal surface, planed to be extracted for orthodontic, prosthetic or surgical reasons, were included in this study. The agreement between histological diagnosis and diagnostic and treatment decisions of evaluated methods was assessed. The obtained results showed that specificities and sensitivities were for VTI=83 and 36%, and LF-77 and 96%. The percentage of correct treatment decisions were: VTI=54% and LF-80%. Diagnosing caries was significantly dependent on the fissure morphology and LF showed statistically better results than VTI. It can be concluded that laser fluorescence was significantly efficient and more accurate in diagnosing initial carious lesions on occlusal surfaces.

scholarly journals Application of Contemporary Magnifying Methods in the Diagnostics of Occlusal Carious Lesions on First Permanent Molars in Children

Folia Medica ◽  
2020 ◽  
Vol 62 (3) ◽  
pp. 585-591
Author(s):  
Maya Rashkova ◽  
Ralitsa Bogovska-Gigova ◽  
Hristina Tankova ◽  
Natalia Gateva ◽  
Nadezhda Mitova ◽  
...  
Keyword(s):  
Early Stage ◽  
Age Groups ◽  
Pediatric Dentistry ◽  
Occlusal Surface ◽  
Invasive Treatment ◽  
Carious Lesions ◽  
Occlusal Surfaces ◽  
Permanent Molars ◽  
Clinical Conditions ◽  
Early Caries

Introduction: Dental operating microscopes (DOM) enable dentists to examine, with the aid of magnification and photodocumentation in clinical conditions, the occlusal anatomy of newly erupted permanent molars and to detect any early carious lesions more precisely. Aim: To determine the advantages of magnifying technology in detecting early occlusal carious lesions in newly erupted permanent first molars. Materials and methods: We examined 176 first molars of 44 children divided into two age groups: 7-8 and 9-10 years. The surfaces of each of the teeth were examined after they were cleaned with a brush without paste. The diagnoses were first made using only illumination and a clinical examination. These were followed by a visual examination of the occlusal surface using a DOM at &times;8 magnification. A photo of the occlusal surface was then taken with a camera at the respective magnification for the purposes of photodocumentation. Results: This study demonstrated that dental operating microscopes increased by 7% the rate of successful detection of early caries lesions on the occlusal surfaces. There was also a significant increase of the number of diagnosed cavitated caries in the dentine in comparison with those detected with naked eye. Using DOMs in pediatric dentistry facilitates the more detailed and precise diagnosing of early stage carious lesions and/or cavitations in the fissures. Conclusion: The use of a DOM facilitates differential diagnosing between deep fissures and early carious lesions, which is a key point in the assessment of occlusal surfaces of newly erupted permanent molars, necessary for their preventative sealing and micro-invasive treatment.

Monobloco – cimentação de pino e preenchimento em único passo em dente tratado endodonticamente

2020 ◽  
Vol 10 (37) ◽  
pp. 10-19
Author(s):  
Patrícia Ferronato Araújo ◽  
Ana Carolina Portes Pasmadjian ◽  
Antonio Setsuo Sakamoto Junior
Keyword(s):  
Composite Resin ◽  
Case Reports ◽  
Single Step ◽  
Resin Cement ◽  
Endodontically Treated Teeth ◽  
Posterior Teeth ◽  
Elasticity Module ◽  
Post And Core Technique ◽  
Post And Core ◽  
Root Fiber

The literature reports several materials for the restoration of endodontically treated teeth, with coronal destruction that requires an intra-root fiber post to stabilize the prosthetic part. The intra-radicular post of composite resin reinforced with fiberglass can be used as retainers in rehabilitating endodontically treated teeth due to their adhesiveness, pleasing aesthetics, and elasticity module close to the dentin less wear on the remaining structure. This clinical case reports the step-by-step application of dual resin cement (Rebilda DC Dentine - Voco) used as the cementation material of the post and material for the filling core in a single step, in an upper right lateral incisor. Moreover, it describes the advantages and indications of the post-and-core technique, also called “monobloc” which can be used in both anterior and posterior teeth. This protocol minimizes the adhesive interfaces, the chair time, and the steps of the clinical procedure.

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