Long-term clinical evaluation of the color stability and stainability of acrylic resin denture teeth

2015 ◽  
Vol 113 (6) ◽  
pp. 628-635 ◽  
Author(s):  
Valentim Adelino Ricardo Barão ◽  
Erika Shiguematsu Ogawa ◽  
Amália Moreno ◽  
Marcelo Ferraz Mesquita ◽  
Alvin G. Wee ◽  
...  
Keyword(s):  
Clinical Evaluation ◽  
Color Stability ◽  
Acrylic Resin ◽  
Denture Teeth

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.

Effect of polymerization methods and thermal cycling on color stability of acrylic resin denture teeth

2009 ◽  
Vol 102 (6) ◽  
pp. 385-392 ◽  
Author(s):  
Wirley Gonçalves Assunção ◽  
Valentim Adelino Ricardo Barão ◽  
Murillo Sucena Pita ◽  
Marcelo Coelho Goiato
Keyword(s):  
Thermal Cycling ◽  
Color Stability ◽  
Acrylic Resin ◽  
Denture Teeth

scholarly journals Advances in Soft Denture Liners: An Update

2015 ◽  
Vol 16 (4) ◽  
pp. 314-318 ◽  
Author(s):  
Farouk Ahmed Hussein
Keyword(s):  
Color Stability ◽  
Acrylic Resin ◽  
Silicone Elastomers ◽  
Acrylic Polymers ◽  
Acrylic Resins ◽  
Implant Placement ◽  
Impression Materials ◽  
Recent Developments ◽  
Denture Liners

ABSTRACT Soft denture liners are used in complete and partial removable dentures to distribute functional loads homogeneously on the denture-bearing tissues. These materials are recommended in cases of irregular bone resorption, bony undercuts, thin atrophic mucosa, immediate prosthesis, healing after implant placement, and for patients with bruxism and xerostomia. The resilient lining materials can be categorized as plasticized acrylic resins or silicone elastomers. The plasticized acrylic resin comprises of acrylic polymers and copolymers, a liquid containing an acrylic monomer and plasticisers, such as ethyl alcohol and/or ethyl acetate responsible for preserving the material softness. The silicone elastomers, consisting of dimethylsiloxane polymers, with a chemical composition similar to that of the silicone impression materials devoid of leachable plasticisers, retain their elastic properties for prolonged periods. Most of the currently available materials have several disadvantages, including color stability, long-term resiliency, abrasion resistance, bond strength and porosity. Several modifications have been done recently to overcome of these disadvantages of the soft liners. The current review summarizes the recent developments in soft liners. How to cite this article Hashem MI. Advances in Soft Denture Liners: An Update. J Contemp Dent Pract 2015;16(4):314-318.

Enhanced Long-Term Color Stability of Teeth Treated with Hydrogen Peroxide and Non-Thermal Atmospheric Pressure Plasma Jets

2014 ◽  
Vol 11 (11) ◽  
pp. 1010-1017 ◽  
Author(s):  
Seoul Hee Nam ◽  
Hyun Wook Lee ◽  
Jin Woo Hong ◽  
Hae June Lee ◽  
Gyoo Cheon Kim
Keyword(s):  
Hydrogen Peroxide ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Color Stability ◽  
Plasma Jets ◽  
Pressure Plasma

Deinstitutionalisation for Long-Term Mental Illness: A 2-Year Clinical Evaluation

2000 ◽  
Vol 34 (3) ◽  
pp. 476-483 ◽  
Author(s):  
Coletta Hobbs ◽  
Christopher Tennant ◽  
Alan Rosen ◽  
Lesley Newton ◽  
Helen M. Lapsley ◽  
...  
Keyword(s):  
Clinical Evaluation ◽  
Social Behaviour ◽  
Rating Scale ◽  
Longitudinal Design ◽  
Psychiatric Service ◽  
Clinical Effectiveness ◽  
Psychotic Symptoms ◽  
Service Support ◽  
Community Psychiatric Service

Objective: The closure of a long-stay psychiatric hospital in Sydney caused the transfer of an initial 40 very long-term patients to four community residences, each with 10 beds, for a continuing process of deinstitutionalisation. Community psychiatric service support and 24-h supervision were provided. This paper describes the residents' clinical progress which was assessed over a 2-year period. Method: This study employed a quasi-experimental longitudinal design. Evaluation commenced prior to discharge and continued for 2 years following community relocation using the Brief Psychiatric Rating Scale, Life Skills Profile, Social Behaviour Scale, Montgomery Asberg Depression Rating Scale and Quality Of Life measures. Readmission, demographic, case history and medication data were also collected. Results: Of the 40 patients initially transferred to the community, seven required long-term readmission to hospital (either prior to or after amalgamation) and one patient died of medical causes. Additional patients transferred from the hospital to the community following the readmissions. Three of these additional patients had achieved a 2-year community tenure during the study period and were included in the clinical evaluation. The 35 residents in total who remained in the community for 2 years, demonstrated a significant improvement in psychotic symptoms, without significant change in the level of neuroleptic medication. Importantly, the 2 years of community living resulted in a significant increase in the residents' life satisfaction. There were no statistically significant changes in residents' living skills, depressive symptoms or social behaviour problems over the 2 years, indicative of the need for supervision and community service support following deinstitutionalisation. Over the 2-year period, some 37% of the residents required temporary readmission. Conclusion: This study demonstrates the clinical effectiveness of deinstitutionalisation, when planned within a mental health system with adequate community resources.

COMPARATIVE STRESS ANALYSIS OF LINGUALIZED AND CONVENTIONAL BALANCED OCCLUSION SCHEMES IN A FULL-ARCH FIXED IMPLANT PROSTHESIS USING FINITE ELEMENT ANALYSIS

2017 ◽  
Vol 17 (04) ◽  
pp. 1750074
Author(s):  
MD ABU HASAN ◽  
PANOS S. SHIAKOLAS
Keyword(s):  
Cortical Bone ◽  
Acrylic Resin ◽  
Element Analysis ◽  
Posterior Teeth ◽  
Failure Index ◽  
Biomechanical Behavior ◽  
Denture Teeth ◽  
Implant Prosthesis ◽  
Von Mises ◽  
Von Mises Stresses

This study compares the biomechanical behavior of a mandibular full-arch fixed implant prosthesis with four implants under lingualized and conventional balanced occlusion schemes. The acrylic resin denture was supported by four titanium cylindrical implants and connected via a titanium prosthetic rectangular bar. Orthotropic material was used for the cortical and cancellous bones. The applied loadings were vertical and bilateral: 100[Formula: see text]N on first molar and 50[Formula: see text]N on first and second premolars each. For the lingualized balanced occlusion, the loadings were applied in central fossae of the posterior teeth, whereas for the conventional balanced occlusion the loadings were applied in central fossae and buccal cusps. The maximum von-Mises stresses for the lingualized and conventional balanced schemes were 301[Formula: see text]MPa and 25[Formula: see text]MPa, respectively, and were located at the neck of the posterior implants. In the denture teeth, the highest stress was located at the beginning of the cantilever extension. In the cortical bone, according to Tsai–Wu criterion, the failure index for the lingualized balanced occlusion was 1.10 and for the conventional balanced occlusion was 0.83. Thus, the conventional balanced occlusion demonstrated more favorable stress distribution in the implants and the cortical bone than the lingualized balanced occlusion.

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