The resin-matrix cement layer thickness resultant from the intracanal fitting of teeth root canal posts: an integrative review

2021 ◽  
Author(s):  
Valter Fernandes ◽  
Ana S. Silva ◽  
Oscar Carvalho ◽  
Bruno Henriques ◽  
Filipe S. Silva ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Root Canal ◽  
Integrative Review ◽  
Resin Matrix ◽  
Cement Layer

scholarly journals The Influence of Cement Layer Thickness on the Stress State of Metal Inlay Restorations—Photoelastic Analysis

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 599
Author(s):  
Grzegorz Sokolowski ◽  
Michal Krasowski ◽  
Agata Szczesio-Wlodarczyk ◽  
Bartlomiej Konieczny ◽  
Jerzy Sokolowski ◽  
...  
Keyword(s):  
Stress State ◽  
Layer Thickness ◽  
Resin Composite ◽  
Water Immersion ◽  
Cylindrical Sample ◽  
Resin Cement ◽  
Adhesive Resin ◽  
Cement Layer ◽  
Contraction Stress ◽  
Photoelastic Analysis

The successful restoration of teeth requires a good connection between the inlay and natural tissue. A strong bond may improve retention and reinforce tooth structure. The purpose of this study was to evaluate the influence of cement layer thickness on contraction stress generated during photopolymerization, and to determine the changes in stress state of the cement occurring during aging in water (over 84 days). Two cements were used: resin composite cement (NX3) and self-adhesive resin cement (Maxcem Elite Chroma). A cylindrical sample made of CuZn alloy was used to imitate the inlay. The stress state was measured by photoelastic analysis. The contraction stress of the inlay restoration was calculated for cement layer thicknesses of 25 µm, 100 µm, 200 µm, and 400 µm. For both tested materials, the lowest contraction stress was observed for the thinnest layer (25 µm), and this increased with thickness. Following water immersion, a significant reduction in contraction stress was observed due to hygroscopic expansion. Applying a thin layer (approximately 25 µm) of composite and self-adhesive resin cements resulted in high levels of expansion stresses (over −6 MPa) after water aging.

The Effect of PMMA Thickness on Thermal Bone Necrosis around Acetabular Sockets

1994 ◽  
Vol 208 (1) ◽  
pp. 45-51 ◽  
Author(s):  
I C Revie ◽  
M E Wallace ◽  
J F Orr
Keyword(s):  
Layer Thickness ◽  
Hip Replacement ◽  
Curing Temperature ◽  
In Vitro Experiments ◽  
Bone Necrosis ◽  
Maximum Thickness ◽  
Cement Layer ◽  
Temperature Time

One aim of custom acetabular hip replacement sockets is to achieve fixation through a uniform cement layer of selected thickness. In vitro experiments demonstrate that curing temperatures are determined by cement thickness and position relative to the socket rim. A maximum thickness of 7 mm is indicated by interpretation of curing temperature-time relationships in terms of predicted bone necrosis. It is concluded that the results contribute to the establishment of an optimum cement layer thickness, but other factors require investigation to complement this work to gain further understanding of the problem.

scholarly journals Evaluation of Carbon Dioxide-Based Urethane Acrylate Composites for Sealers of Root Canal Obturation

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 482 ◽  
Author(s):  
Hao-Hueng Chang ◽  
Yi-Ting Tseng ◽  
Sheng-Wun Huang ◽  
Yi-Fang Kuo ◽  
Chun-Liang Yeh ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Root Canal ◽  
Antibacterial Effect ◽  
Resin Matrix ◽  
Urethane Acrylate ◽  
Alamar Blue ◽  
Root Canal Obturation ◽  
Microbial Response ◽  
Superior Mechanical Properties ◽  
Ldh Assay

A new root canal sealer was developed based on urethane acrylates using polycarbonate polyol (PCPO), a macrodiol prepared in the consumption of carbon dioxide as feedstock. The superior mechanical properties and biostability nature of PCPO-based urethane acrylates were then co-crosslinked with a difunctional monomer of tripropylene glycol diarylate (TPGDA) as sealers for resin matrix. Moreover, nanoscale silicate platelets (NSPs) immobilized with silver nanoparticles (AgNPs) and/or zinc oxide nanoparticles (ZnONPs) were introduced to enhance the antibacterial effect for the sealers. The biocompatibility and the antibacterial effect were investigated by Alamar blue assay and LDH assay. In addition, the antibacterial efficiency was performed by using Enterococcus faecalis (E. faecalis) as microbial response evaluation. These results demonstrate that the PCPO-based urethane acrylates with 50 ppm of both AgNP and ZnONP immobilized on silicate platelets, i.e., Ag/ZnO@NSP, exhibited great potential as an antibacterial composite for the sealer of root canal obturation.

The Principal Stress Distribution in a Root with a Loaded Post in Model Experiments

1977 ◽  
Vol 56 (12) ◽  
pp. 1463-1467 ◽  
Author(s):  
Tore Dérand
Keyword(s):  
Stress Distribution ◽  
Principal Stress ◽  
Root Canal ◽  
Model Experiments ◽  
Cement Layer ◽  
Maximum Stresses

The princapal stress distribution in a root with a loaded post was analyzed in model experiments, in which emphasis was directed to the cervical boundary of the root where the stresses are greatest. Maximum stresses were found in the inner proximal sides, and were stronger when the prepared root canal walls were parallel. When contact between post and root was reduced, stresses decreased. These findings point to the importance of sparing tooth substance in the proximal parts of the canal in order to reduce the risk of breaking the cement layer and loosening the post.

scholarly journals Adhesion capacity of bioceramic and resin-based root canal sealer to root dentin: an integrative review

2020 ◽  
Vol 77 ◽  
pp. 1
Author(s):  
Carolyne De Pinho Quintão ◽  
Sabrina Teixeira Pinto Costa ◽  
Mariane Floriano Lopes Santos Lacerda ◽  
Caroline Felipe Magalhães Girelli ◽  
Carolina Oliveira De Lima
Keyword(s):  
Root Canal ◽  
Web Of Science ◽  
Integrative Review ◽  
Root Canal Sealer ◽  
Ah Plus ◽  
Root Dentin

Objetivo: comparar a capacidade de adesão do cimento biocerâmico EndoSequence BC e do cimento resinoso AH Plus através de uma revisão integrativa. Material e Métodos: os bancos de dados online Medline/PubMed, Scopus, Web of Science e BVS foram utilizados para a revisão da literatura. Os critérios de elegibilidade incluíram artigos disponíveis na íntegra nas bases de dados pesquisadas, em inglês, e o conteúdo referente à adesão do cimento Endosequence BC sealer em comparação ao AH Plus. Resultados: foram encontrados 45 artigos. Após a remoção duplicada, 22 artigos foram selecionados. Após a leitura dos resumos, textos completos e aplicação dos critérios de inclusão, foram incluídos no total oito artigos. Em relação à capacidade de adesão dos cimentos testados, o AH Plus apresentou melhor adesão do que o cimento BC sealer em três artigos e menor adesão em dois artigos. Força de adesão semelhante foi observada entre os grupos em três estudos. Conclusões: com base nos estudos incluídos, o AH Plus apresenta maior resistência de união quando comparado ao BC Sealer

A Distribution Medium Considered Resin Flow Simulation Model for Vacuum Infusion Molding Process

2013 ◽  
Vol 753-755 ◽  
pp. 221-224
Author(s):  
Rui Yang ◽  
Long Tao Li ◽  
Yan Xin Zhao
Keyword(s):  
Simulation Model ◽  
Layer Thickness ◽  
Flow Simulation ◽  
Parabolic Type ◽  
Resin Matrix ◽  
Resin Flow ◽  
Flow Front ◽  
Molding Process ◽  
Fiber Layer ◽  
Front Profile

Based on the flow characteristics of resin in fiber perform, a simulation model considering distribution medium was developed, and impregnation of fiberglass reinforced resin matrix composites was numerically simulated. The fiberglass layer thickness on VIMP microscopic impregnation was analyzed in simulation. The results show that increasing fiberglass layer thickness can reduce the flow velocity of the resin and the resin flow front profile approximates a straight line type, so the fluctuation is small, and the final product has few dry spots; reducing the glass fiber layer thickness can improve wetting speed but resin flow front profile approximates a parabolic type, so the fluctuation is large, and the final product has more dry spots, the resin flow front profile can provide guidance for prediction and optimization of the infusion process.

scholarly journals Incorporation of particulate bioactive glasses into a dental root canal sealer

2016 ◽  
Vol 2 (1) ◽  
Author(s):  
Susanne Heid ◽  
Philipp R. Stoessel ◽  
Tobias T. Tauböck ◽  
Wendelin J. Stark ◽  
Matthias Zehnder ◽  
...  
Keyword(s):  
Bioactive Glass ◽  
Epoxy Resin ◽  
Bismuth Oxide ◽  
Root Canal ◽  
Polymerization Reaction ◽  
Resin Matrix ◽  
Flame Spray ◽  
Complex Materials ◽  
Root Canal Sealer ◽  
Flame Spray Synthesis

AbstractFlame spray synthesis has opened the possibility to add additional elements to complex materials such as bioactive glasseswhile maintaining nanoparticulate properties. In this study, it was investigated whether a flamesprayed bismuth oxide doped nanometric 45S5 bioactive glass could be incorporated into a commercially available epoxy-resin root canal sealer, and how this compared to a conventional, pure 45S5 micrometric bioactive glass. Effects on radiopacity, microhardness, pH and mineral induction in phosphate buffered saline and simulated body fluid were studied. It was revealed that the radiopaque nanometric bismuth-containing 45S5 bioactive glass reduced radiopacity of the root canal sealer less than a conventional micrometric counterpart. In addition, pH induction and calcium phosphate precipitation were quicker with the nanometric compared to the micrometric material, whilst the micrometric glass displayed a higher alkaline capacity. Both materials apparently bound to the epoxy resin matrix, thus increasing its microhardness after polymerization reaction. Effects were dose-dependent. The investigated radiopaque bioactive glass containing bismuth oxide could be a valuable add-on for current root canal sealers.

The influence of zirconia veneer thickness on the degree of conversion of resin-matrix cements: an integrative review

2021 ◽  
Author(s):  
Christie M. Tafur-Zelada ◽  
Oscar Carvalho ◽  
Filipe S. Silva ◽  
Bruno Henriques ◽  
Mutlu Özcan ◽  
...  
Keyword(s):  
Degree Of Conversion ◽  
Integrative Review ◽  
Resin Matrix
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