scholarly journals Responses of the Palatal Mucosa due to Thermal Stimulation after Insetion of Experimental Palatal Plate

1988 ◽  
Vol 6 ◽  
pp. 163-170
Author(s):  
Makoto Segawa ◽  
Mutsuo Yamauchi ◽  
Joji Kawano ◽  
Takashi Sasaki
Keyword(s):  
Thermal Stimulation ◽  
Palatal Plate ◽  
Palatal Mucosa

scholarly journals Development of an Optimal Relief Method for the Palatal Plate by Stress Analysis

2021 ◽  
Author(s):  
Tomoko Mukai ◽  
Yuji Sato ◽  
Osamu Shimodaira ◽  
Junichi Furuya ◽  
Akio Isobe ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Bearing Capacity ◽  
Stress Analysis ◽  
Three Dimensional ◽  
Distribution Volume ◽  
Palatal Plate ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Palatal Mucosa

Abstract Background: A maxillary-palate-shaped device for simultaneous measurement of bite force and palatal mucosal subsidence at the time of pain onset in dentate persons has been developed. However, palatal mucosal stress analysis in a simulation based on three-dimensional finite element analysis is effective for objective and efficient evaluation of various types of denture-supporting mucosa. Recently plate dentures are not easily modified after the completion of these dentures , so it is essential to effectively assess the sites and magnitude of relief at the time of preparation. However, there is considerable variation in the magnitude of optimal relief and relief range, and there are no guidelines that present these clearly, leading the surgeon to decide subjectively. Thus, this study aimed to develop an optimal relief method to improve the stress bearing capacity of the palatal mucosa.Objectives: The objective of this study, the borderline was set in steps. The changes in stress distribution in the palatal mucosa due to the selective relief of stresses above the borderline were evaluated using a three-dimensional finite element simulation. The purpose of this study was to develop an optimal relief method to improve the bearing capacity of the palatal mucosa.Methods: The objective of this study, the borderline, was set in steps. A three-dimensional finite element model for the pseudopalatal plate was prepared and used to evaluate the changes in stress distribution in the palatal mucosa due to the selective relief of stresses above the borderline. The resulting data were used to develop the optimal relief method.Results: In the relief model with a borderline of 0.04 MPa or higher, the distribution volume at which high stress of 0.20 MPa or higher is generated was approximately about 800%％ of that with the no-relief model, and in the relief model with a borderline of 0.06 MPa or higher, the respective ratio was approximately about 280％%. On the other hand, the relief models with borderline of 0.14 MPa or higher were about 60%. In the mid-palatal relief model, the distribution volume at which stress of 0.20 MPa or higher was generated was 180% of that in the relief model.Conclusions: The supportive strength of plates can be increased by selectively applying optimal relief rather than standard relief, allowing for easier and more effective plate-denture treatment.

Effect of Relief at the Median Palatal Plate on Denture-supporting Ability

2017 ◽  
Vol 7 (4) ◽  
pp. 117-123
Author(s):  
Naoya Takamatsu
Keyword(s):  
Quality Of Life ◽  
Clinical Significance ◽  
Experienced Pain ◽  
Palatal Plate ◽  
Oral Conditions ◽  
Relief Area ◽  
Palatal Mucosa

ABSTRACT Aim A new maxillary palatal plate-form device that simultaneously measures clenching force and subsidence of the palatal mucosa at the onset of jaw clenching pain was developed to ascertain the effect of median palatal plate relief on denture-bearing ability. Materials and methods In 15 dentulous subjects, pseudo-palatal plates were affixed to the palatal mucosa; anterior splints were affixed as maxillary references for measuring subsidence upon transmission of the clenching force through a pressurizing splint affixed to the mandible. The relief at the median palatal plate was categorized as: No-relief, 0.23 mm relief, and 0.46 mm relief. Subjects clenched their jaws until they experienced pain. The clenching force and subsidence of the palatal mucosa were simultaneously measured and compared across relief categories, and their relationship to the extent of relief at the onset of pain was evaluated. Results At the onset of pain, both clenching force and subsidence of the palatal mucosa in the relief conditions were significantly greater than those in the no-relief condition (p < 0.05). In some patients, both clenching force and subsidence of the palatal mucosa decreased with increase in relief. Conclusion Relief at the median palatal plate effectively increases the bearing ability of the palatal part. However, the range and extent of relief might vary, depending on oral conditions. Clinical significance Using this approach, the relief area of maxillary full dentures suitable for individual patients was determined in an objective and convenient manner and the accuracy of denture treatments was improved. This could improve the quality of life of patients wearing dentures. How to cite this article Tanaka S, Sato Y, Kitagawa N, Shimodaira O, Isobe A, Takamatsu N, Omori T. Effect of Relief at the Median Palatal Plate on Denture-supporting Ability. Int J Prosthodont Restor Dent 2017;7(4):117-123.

scholarly journals Development of an optimal relief method for the palatal plate by stress analysis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Tomoko Mukai ◽  
Yuji Sato ◽  
Osamu Shimodaira ◽  
Junichi Furuya ◽  
Akio Isobe ◽  
...  
Keyword(s):  
Finite Element ◽  
High Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Distribution Volume ◽  
The Other ◽  
Palatal Plate ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Palatal Mucosa

Abstract Background Plate dentures cannot be easily modified after fabrication; therefore, the sites and magnitude of relief must be effectively assessed at the time of fabrication. However, a considerable variation exists in the magnitude of optimal relief and relief range, and there are no guidelines that present these clearly, leading the dentists to decide subjectively. Thus, this study aims to develop an optimal relief method to improve the stress bearing capacity of the palatal mucosa. Methods The objective of this study, namely, the borderline, was set in steps. A three-dimensional finite element model for the pseudopalatal plate was created and used to evaluate the changes in stress distribution in the palatal mucosa due to the selective relief of stresses above the borderline. The resulting data were used to develop the optimal relief method. Results In the relief model with a borderline of 0.04 MPa or higher, the distribution volume at which a high stress of 0.20 MPa or higher is generated was approximately 800% of that with the no-relief model, and in the relief model with a borderline of 0.06 MPa or higher, the respective ratio was approximately 280%. On the other hand, the relief models with a borderline of 0.14 MPa or higher were approximately 60%. In the mid-palatal relief model, the distribution volume at which a stress of 0.20 MPa or higher was generated was 180% of that in the relief model. Conclusions The supportive strength of plates can be increased by selectively applying optimal relief rather than standard relief, allowing for easier and more effective plate-denture treatment.

scholarly journals Accuracy Evaluation of Additively and Subtractively Fabricated Palatal Plate Orthodontic Appliances for Newborns and Infants–An In Vitro Study

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4103
Author(s):  
Maite Aretxabaleta ◽  
Alexey Unkovskiy ◽  
Bernd Koos ◽  
Sebastian Spintzyk ◽  
Alexander B. Xepapadeas
Keyword(s):  
Layer Thickness ◽  
In Vitro Study ◽  
Orthodontic Appliances ◽  
Accuracy Evaluation ◽  
Palatal Plate ◽  
Cad Cam ◽  
Subtractive Manufacturing ◽  
Palatal Stimulation ◽  
Manufacturing Time

Different approaches for digital workflows have already been presented for their use in palatal plates for newborns and infants. However, there is no evidence on the accuracy of CAD/CAM manufactured orthodontic appliances for this kind of application. This study evaluates trueness and precision provided by different CAM technologies and materials for these appliances. Samples of a standard palatal stimulation plate were manufactured using stereolithography (SLA), direct light processing (DLP) and subtractive manufacturing (SM). The effect of material (for SM) and layer thickness (for DLP) were also investigated. Specimens were digitized with a laboratory scanner (D2000, 3Shape) and analyzed with a 3D inspection software (Geomagic Control X, 3D systems). For quantitative analysis, differences between 3D datasets were measured using root mean square (RMS) error values for trueness and precision. For qualitative analysis, color maps were generated to detect locations of deviations within each sample. SM showed higher trueness and precision than AM technologies. Reducing layer thickness in DLP did not significantly increase accuracy, but prolonged manufacturing time. All materials and technologies met the clinically acceptable range and are appropriate for their use. DLP with 100 µm layer thickness showed the highest efficiency, obtaining high trueness and precision within the lowest manufacturing time.

scholarly journals Hydra vulgaris shows stable responses to thermal stimulation despite large changes in the number of neurons

iScience ◽  
2021 ◽  
pp. 102490
Author(s):  
Constantine N. Tzouanas ◽  
Soonyoung Kim ◽  
Krishna N. Badhiwala ◽  
Benjamin W. Avants ◽  
Jacob T. Robinson
Keyword(s):  
Thermal Stimulation ◽  
Hydra Vulgaris

Fracture network stimulation effect on hydrate development by depressurization combined with thermal stimulation using injection-production well patterns

Energy ◽  
2021 ◽  
Vol 228 ◽  
pp. 120601
Author(s):  
Xiuping Zhong ◽  
Dongbin Pan ◽  
Ying Zhu ◽  
Yafei Wang ◽  
Lianghao Zhai ◽  
...  
Keyword(s):  
Fracture Network ◽  
Thermal Stimulation ◽  
Production Well

scholarly journals Candida albicans in patients with oronasal communication and obturator prostheses

2009 ◽  
Vol 20 (4) ◽  
pp. 336-340 ◽  
Author(s):  
Beatriz Silva Câmara Mattos ◽  
Andréa Alves de Sousa ◽  
Marina Helena C. G. de Magalhães ◽  
Marcia André ◽  
Reinaldo Brito e Dias
Keyword(s):  
Candida Albicans ◽  
Oral Mucosa ◽  
Sodium Hypochlorite ◽  
Buccal Mucosa ◽  
Treatment Evaluation ◽  
Antifungal Treatment ◽  
Therapeutic Protocol ◽  
Candidal Infection ◽  
Oral Candida ◽  
Palatal Mucosa

Patients using obturator prostheses often present denture-induced stomatitis. In order to detect the presence of oral Candida albicans in patients with oronasal communications and to evaluate the effectiveness of a topical antifungal treatment, cytological smears obtained from the buccal and palatal mucosa of 10 adult patients, and from the nasal acrylic surface of their obturator prostheses were examined. A therapeutic protocol comprising the use of oral nystatin (Mycostatin®) and prosthesis disinfection with sodium hypochlorite was prescribed for all patients. Seven patients were positive for C. albicans in the mucosa, with 1 negative result for the prosthetic surface in this group of patients. Post-treatment evaluation revealed the absence of C. albicans on prosthesis surface and on the oral mucosa of all patients. The severity of the candidal infection was significantly higher in the palatal mucosa than in the buccal mucosa, but similar in the palatal mucosa and prosthesis surface, indicating that the mucosa underlying the prosthesis is more susceptible to infection. The therapeutic protocol was effective in all cases, which emphasizes the need for denture disinfection in order to avoid reinfection of the mucosa.

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