M. Makino, C. Masaki, K. Tomoeda, Megumi Takenaka, T. Kojo, Shigeki Murakami, R. Hosokawa
Bruxism is a very common parafunction of the masticatory system. Currently, there is consensus about the multifactorial nature of the etiology of bruxism, and it is thought to be a central nervous system phenomenon related to stress and pain behavior rather than structural components. The relationship of bruxism and subjective stress has remained unclear. Recently, biomarkers have been used for assessing stress reaction such as chromogranin A (CgA) and cortisol. The level of CgA provides a sensitive and reliable index for evaluating psychological stress. We can have many reports about plasma CgA, but we can't have enough reports about salivary CgA. The aim of this study was to clarify circadian variation CgA in saliva. Four adults (1 male, 3 females) participated in this research. Subjects provided ten saliva samples. Saliva samples were collected in the morning (9 am) and in the night (21 pm), and every 3 h for 24 h. In addition, saliva samples were two-minute stimulated and unstimulated samples to measure CgA concentration, major salivary stress biomarkers. Unstimulated salivary CgA concentration varied more in time and individual difference than stimulated. Stimulated salivary CgA concentration was increased from 12 pm to 18 pm. Salivary CgA seemed to have a circadian variation with peak in the afternoon-night period and a nadir in the noon. With regard to circadian variations, salivary CgA concentrations, in particular stimulated saliva, hardly differ from plasma CgA. It was concerned that CgA concentration was influenced from a lot of factors.
{"title":"Circadian Variations of Salivary Stress Marker (Chromogranin A)","authors":"M. Makino, C. Masaki, K. Tomoeda, Megumi Takenaka, T. Kojo, Shigeki Murakami, R. Hosokawa","doi":"10.2186/PRP.7.189","DOIUrl":"https://doi.org/10.2186/PRP.7.189","url":null,"abstract":"Bruxism is a very common parafunction of the masticatory system. Currently, there is consensus about the multifactorial nature of the etiology of bruxism, and it is thought to be a central nervous system phenomenon related to stress and pain behavior rather than structural components. The relationship of bruxism and subjective stress has remained unclear. Recently, biomarkers have been used for assessing stress reaction such as chromogranin A (CgA) and cortisol. The level of CgA provides a sensitive and reliable index for evaluating psychological stress. We can have many reports about plasma CgA, but we can't have enough reports about salivary CgA. The aim of this study was to clarify circadian variation CgA in saliva. Four adults (1 male, 3 females) participated in this research. Subjects provided ten saliva samples. Saliva samples were collected in the morning (9 am) and in the night (21 pm), and every 3 h for 24 h. In addition, saliva samples were two-minute stimulated and unstimulated samples to measure CgA concentration, major salivary stress biomarkers. Unstimulated salivary CgA concentration varied more in time and individual difference than stimulated. Stimulated salivary CgA concentration was increased from 12 pm to 18 pm. Salivary CgA seemed to have a circadian variation with peak in the afternoon-night period and a nadir in the noon. With regard to circadian variations, salivary CgA concentrations, in particular stimulated saliva, hardly differ from plasma CgA. It was concerned that CgA concentration was influenced from a lot of factors.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"16 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120823163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Minagi, Y. Kinuta, J. Sejima, T. Hara, G. Nishigawa, Y. Maruo, T. Arima, K. Oki, M. Oka, K. Hasegawa, N. Kodama, Chie Shimazu-Kodama, M. Suwaki, Y. Torii, H. Shirai
One of the prominent roles of the occlusion would be to support the force balance wobbling in stomatognathic system, thus pacing and minimizing the change of force distribution with age. Patient's demands on the prosthetic treatment have been becoming higher and more complicated during the past several decades. These demands include not only the precise restoration of the decayed tooth but also the treatment to provide stable and comfortable state of the stomatognathic system in the longer term. These demands would deeply be related to ; 1) How to finalize the information on temporary or treatment prosthesis, which has the resulted shape of the precise functional adjustment, on the final prosthesis, and 2) How to cope with the persistent complaints regarding tooth, tongue and other related sensations. In these aspects, patient's subjectivity and/or esthesis might need to be satisfied with the form and/or function of the resulted prosthesis. The clinical difficulties might be related to the following two points, which are 1) the accuracy of the reproduction procedure from the treatment prosthesis to the final one and 2) stability of the mandibular position or the condylar position which support the functional basis for the prosthesis. In order to cope with the complicated requirements, we have been using double-casting method for providing cast restorations. This is a method to produce a cast restoration in two functional parts. The first casting step consists of a base-crown which covers the abutment tooth and adjacent proximal contact point(s). The second step is the molding of the functionally required occlusal form onto the base-crown. The third step is the metal casting onto the base-crown replacing the molded portion. This method could be applied in various situations where we are forced to match the function and the form. The purpose of this paper is to provide a good orientation to the double-casting method and also to discuss the concept that might pace and minimize the change of force distribution in stomatognathic system.
{"title":"Occlusion: Supporting and Pacing Force Distribution","authors":"S. Minagi, Y. Kinuta, J. Sejima, T. Hara, G. Nishigawa, Y. Maruo, T. Arima, K. Oki, M. Oka, K. Hasegawa, N. Kodama, Chie Shimazu-Kodama, M. Suwaki, Y. Torii, H. Shirai","doi":"10.2186/PRP.7.117","DOIUrl":"https://doi.org/10.2186/PRP.7.117","url":null,"abstract":"One of the prominent roles of the occlusion would be to support the force balance wobbling in stomatognathic system, thus pacing and minimizing the change of force distribution with age. Patient's demands on the prosthetic treatment have been becoming higher and more complicated during the past several decades. These demands include not only the precise restoration of the decayed tooth but also the treatment to provide stable and comfortable state of the stomatognathic system in the longer term. These demands would deeply be related to ; 1) How to finalize the information on temporary or treatment prosthesis, which has the resulted shape of the precise functional adjustment, on the final prosthesis, and 2) How to cope with the persistent complaints regarding tooth, tongue and other related sensations. In these aspects, patient's subjectivity and/or esthesis might need to be satisfied with the form and/or function of the resulted prosthesis. The clinical difficulties might be related to the following two points, which are 1) the accuracy of the reproduction procedure from the treatment prosthesis to the final one and 2) stability of the mandibular position or the condylar position which support the functional basis for the prosthesis. In order to cope with the complicated requirements, we have been using double-casting method for providing cast restorations. This is a method to produce a cast restoration in two functional parts. The first casting step consists of a base-crown which covers the abutment tooth and adjacent proximal contact point(s). The second step is the molding of the functionally required occlusal form onto the base-crown. The third step is the metal casting onto the base-crown replacing the molded portion. This method could be applied in various situations where we are forced to match the function and the form. The purpose of this paper is to provide a good orientation to the double-casting method and also to discuss the concept that might pace and minimize the change of force distribution in stomatognathic system.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"312 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132895307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Yaka, Shinobu Shimokawara, Hironobu Yamamoto, K. Ohmori, M. Kurihara, Mineyo Sone, Hiroyuki Nakazato, Yoshihiko Kanaya, Masami Ichikawa, M. Fujisawa, S. Ohkawa
The purpose of this study was to determine the relationship between subjective discomfort⁄difficulty in function after insertion of a palatal bar and location of the bar. Also, the effect of palatal depth was examined. Thirty-four healthy subjects were asked to rate 3 types of bar (anterior, middle, and posterior bar) for 5 items representing various aspects of discomfort and subjective difficulty in function immediately after the insertion of each bar appliance. The palatal depth in anterior, middle and posterior regions was measured for each subject; and the relationship between the rated scores and palatal depth was investigated. In addition, in 12 of the 34 subjects, these palatal bars were inserted; and the score of each item was determined immediately and 3 days after the insertion. The posterior bar showed the highest scores for all items. The anterior bar showed a higher score on the item related to speech, but a lower score on the item related to chewing than did the middle one. The subjects with their palate being deeper at the middle region and shallower at the posterior showed a significantly lower score on the item related to speech than those with a palate deeper at the middle and posterior regions. By 3 days after the insertion of the middle bar, the scores significantly decreased for most of items. Our data suggest that the depth of palate both at the middle and at the posterior region have an influence on the subjective difficulty in speech immediately after the insertion.
{"title":"Influence of Location of Palatal Bar on Discomfort and Subjective Difficulty in Function","authors":"T. Yaka, Shinobu Shimokawara, Hironobu Yamamoto, K. Ohmori, M. Kurihara, Mineyo Sone, Hiroyuki Nakazato, Yoshihiko Kanaya, Masami Ichikawa, M. Fujisawa, S. Ohkawa","doi":"10.2186/PRP.7.204","DOIUrl":"https://doi.org/10.2186/PRP.7.204","url":null,"abstract":"The purpose of this study was to determine the relationship between subjective discomfort⁄difficulty in function after insertion of a palatal bar and location of the bar. Also, the effect of palatal depth was examined. Thirty-four healthy subjects were asked to rate 3 types of bar (anterior, middle, and posterior bar) for 5 items representing various aspects of discomfort and subjective difficulty in function immediately after the insertion of each bar appliance. The palatal depth in anterior, middle and posterior regions was measured for each subject; and the relationship between the rated scores and palatal depth was investigated. In addition, in 12 of the 34 subjects, these palatal bars were inserted; and the score of each item was determined immediately and 3 days after the insertion. The posterior bar showed the highest scores for all items. The anterior bar showed a higher score on the item related to speech, but a lower score on the item related to chewing than did the middle one. The subjects with their palate being deeper at the middle region and shallower at the posterior showed a significantly lower score on the item related to speech than those with a palate deeper at the middle and posterior regions. By 3 days after the insertion of the middle bar, the scores significantly decreased for most of items. Our data suggest that the depth of palate both at the middle and at the posterior region have an influence on the subjective difficulty in speech immediately after the insertion.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130822113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Asano, M. Kawara, T. Iida, O. Komiyama, Hiroshi Suzuki, Toshikazu Kuroki, C. Kohno
{"title":"Movement of the Condyle Point and Incisal Point during Exercise","authors":"T. Asano, M. Kawara, T. Iida, O. Komiyama, Hiroshi Suzuki, Toshikazu Kuroki, C. Kohno","doi":"10.2186/PRP.7.210","DOIUrl":"https://doi.org/10.2186/PRP.7.210","url":null,"abstract":"","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123082490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
U. Hata, Daisuke Kawauchi, O. Yamamura, Shuu Fujiwara
Purpose: All-ceramic restorations are widely used in esthetic dentistry. Various materials have been used to improve ceramic core strength, but it is unclear whether they affect the opacity of all-ceramic systems. The aim of this study was to compare the translucency of 9 all-ceramic system core materials at clinically appropriate thickness.Materials and methods: A 360-degree round deep chamfer preparation for the all-ceramic crown was made for a maxillary right first molar tooth as the dental model. Coping of 0.5mm thickness were fabricated by Empress Esthetic (ETC1, EOC1, EO1, EO2), Empress2 (50) (IVOCLAR VIVADENT), Procera AllCeram, Procera AllZirkon (Nobel Biocare), LAVA (3M ESPE), and DentaCAD Systeme (Hint-Els). Abutments were made by black wax and white wax. Spectrophotometric measurements were made by a spectrophotometer. The final color of the central part of the buccal surface was measured and the L*a*b* color space was used to obtain the color values. Contrast ratios were calculated from the luminous reflectance (Y) of the specimens with a black (Yb) and a white (Yw) backing to give Yb⁄Yw with CIE illuminant D65 and 2-degree observer function (0.0=transparent, 1.0=opaque).Results: Contrast ratio in order of most translucent to most opaque were as follows: EO2 .41, EO1 .43, ETC1 .43 , EOC1 .44, Empress2 .50, AllCeram .63, AllZirkon .74, LAVA .76, DentaCAD.80. There was no significant difference(p<.05) between the AllZirkon, LAVA, DentaCAD or ETC1, EOC1, EO1, EO2.Conclusion: Within the limitations of this in-vitro study on 9 all-ceramic core systems, a significant range of translucency was identified across specimen groups.
{"title":"Chromatic Study of All-ceramic Restorations: Relative Translucency of 9 All-ceramic Core Materials","authors":"U. Hata, Daisuke Kawauchi, O. Yamamura, Shuu Fujiwara","doi":"10.2186/PRP.7.153","DOIUrl":"https://doi.org/10.2186/PRP.7.153","url":null,"abstract":"Purpose: All-ceramic restorations are widely used in esthetic dentistry. Various materials have been used to improve ceramic core strength, but it is unclear whether they affect the opacity of all-ceramic systems. The aim of this study was to compare the translucency of 9 all-ceramic system core materials at clinically appropriate thickness.Materials and methods: A 360-degree round deep chamfer preparation for the all-ceramic crown was made for a maxillary right first molar tooth as the dental model. Coping of 0.5mm thickness were fabricated by Empress Esthetic (ETC1, EOC1, EO1, EO2), Empress2 (50) (IVOCLAR VIVADENT), Procera AllCeram, Procera AllZirkon (Nobel Biocare), LAVA (3M ESPE), and DentaCAD Systeme (Hint-Els). Abutments were made by black wax and white wax. Spectrophotometric measurements were made by a spectrophotometer. The final color of the central part of the buccal surface was measured and the L*a*b* color space was used to obtain the color values. Contrast ratios were calculated from the luminous reflectance (Y) of the specimens with a black (Yb) and a white (Yw) backing to give Yb⁄Yw with CIE illuminant D65 and 2-degree observer function (0.0=transparent, 1.0=opaque).Results: Contrast ratio in order of most translucent to most opaque were as follows: EO2 .41, EO1 .43, ETC1 .43 , EOC1 .44, Empress2 .50, AllCeram .63, AllZirkon .74, LAVA .76, DentaCAD.80. There was no significant difference(p<.05) between the AllZirkon, LAVA, DentaCAD or ETC1, EOC1, EO1, EO2.Conclusion: Within the limitations of this in-vitro study on 9 all-ceramic core systems, a significant range of translucency was identified across specimen groups.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116740764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Sawada, K. Kimoto, Yusuke Takahashi, Tomoji Sawada, N. Hamada, T. Shibata, N. Hori, H. Aoki, T. Nonami, M. Toyoda
Purpose: This study investigated the inhibitory effect of acrylic resin incorporating FAp-TiO2 against the adhesion of C. albicans.Materials and methods: FAp-TiO2 was added at 1, 5, 10 wt% to acrylic resin to form specimen disks of 7 mm diameter, and the surface roughness was measured. Then, C. albicans was cultured aerobically at 37 °C for 24 hours in glucose peptone yeast extract (GPY) broth, and adjusted to OD=1 at 550 nm with a KCl-buffer. The disks were immersed in the C. albicans suspension for 2 hours at 37 °C with UVA from a black light source. After the incubation, the disks were washed gently with phosphate buffer saline (PBS), and the luminescent signal derived from the viable cells on the disks was determined using a bioluminescence adenosine triphosphate (ATP) assay.Results: In the measurement of surface roughness, no significant difference was observed between any of the specimens. The adhesion assay of C. albicans revealed that a statistically significant decrease was observed in FAp-TiO2 when compared with the control (p‹0.01).Conclusion: We suggest that acrylic resin incorporating FAp-TiO2 prevents the adhesion of C. albicans, indicating a wide range of possibilities for the practical use of new photocatalysts in acrylic resin.
{"title":"Adhesion of C. albicans to Acrylic Resin Containing Fluoridated Apatite-Coated TiO2","authors":"T. Sawada, K. Kimoto, Yusuke Takahashi, Tomoji Sawada, N. Hamada, T. Shibata, N. Hori, H. Aoki, T. Nonami, M. Toyoda","doi":"10.2186/PRP.7.201","DOIUrl":"https://doi.org/10.2186/PRP.7.201","url":null,"abstract":"Purpose: This study investigated the inhibitory effect of acrylic resin incorporating FAp-TiO2 against the adhesion of C. albicans.Materials and methods: FAp-TiO2 was added at 1, 5, 10 wt% to acrylic resin to form specimen disks of 7 mm diameter, and the surface roughness was measured. Then, C. albicans was cultured aerobically at 37 °C for 24 hours in glucose peptone yeast extract (GPY) broth, and adjusted to OD=1 at 550 nm with a KCl-buffer. The disks were immersed in the C. albicans suspension for 2 hours at 37 °C with UVA from a black light source. After the incubation, the disks were washed gently with phosphate buffer saline (PBS), and the luminescent signal derived from the viable cells on the disks was determined using a bioluminescence adenosine triphosphate (ATP) assay.Results: In the measurement of surface roughness, no significant difference was observed between any of the specimens. The adhesion assay of C. albicans revealed that a statistically significant decrease was observed in FAp-TiO2 when compared with the control (p‹0.01).Conclusion: We suggest that acrylic resin incorporating FAp-TiO2 prevents the adhesion of C. albicans, indicating a wide range of possibilities for the practical use of new photocatalysts in acrylic resin.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122870009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Megumi Takenaka, Toru Sato, Toshiaki Kurashima, Masaharu Sato, Yoshiteru Sato, C. Masaki, R. Hosokawa
Purpose: To compare oral health-related quality of life (OHRQoL) with patients who requested implant treatment and conventional denture treatment.Materials and methods: Data were collected by means of self-administered questionnaire during July 2004-January 2005 at four dental offices located in Japan. Subjects who requested implant treatment (IT) were 12, and requested conventional denture treatment (DT) were 19. OHRQoL was measured by the 16-item Oral Health Impact Profile (OHIP-JP16). The OHIP-JP16 total and subscale scores were calculated by summing the 16 items score without weighting. The mean OHIP-JP16 total scores and the mean scores of six subscales (functional limitation, physical discomfort, psychological discomfort, physical disability, psychological disability, handicap) between groups were analyzed by the Mann-Whitney U-test. Chi square tests were used compare responses to individual items. ‘Never’ and ‘hardly ever,’ (no impact) were recorded as ‘0’, ‘occasionally’, ‘fairly often’, and ‘very often’ (any impact) were recorded as ‘1’.Results: The mean age was 62.4 years old in IT and 66.6 years old in DT (p=0.596). No differences in denture status, self-perceived oral health, number of teeth were found between two groups. DT subjects had better OHIP-JP16 total scores than IT, but it was not statistically significant (p>0.05). Chi square tests were performed for each of 16 items. The number of subject reported ‘any impact’ was significantly greater (p<0.05) in IT in the following items; ‘worried’, ‘self-conscious’, ‘avoid eating’, ‘upset’ and ‘life unsatisfactory’. No significant differences were detected in the following 5 subscales; ‘functional limitation’, ‘psychological discomfort’, ‘physical disability’ , ‘psychological disability’ and ‘handicap’, while ‘physical discomfort’ was signify- cantly lower (e.g. higher QOL status) in DT.Conclusion: OHIP-JP16 scores of the subjects who requested implant treatment were significantly higher in ‘physical discomfort’ than requested conventional denture. The results of this study suggested that in the patients who requested implant treatment, OHRQoL might be lower than the patients who requested conventional denture treatment.
{"title":"A Comparison of Oral Health-related Quality of Life between Patients Requesting Implant Treatment and Conventional Denture Treatment","authors":"Megumi Takenaka, Toru Sato, Toshiaki Kurashima, Masaharu Sato, Yoshiteru Sato, C. Masaki, R. Hosokawa","doi":"10.2186/PRP.7.135","DOIUrl":"https://doi.org/10.2186/PRP.7.135","url":null,"abstract":"Purpose: To compare oral health-related quality of life (OHRQoL) with patients who requested implant treatment and conventional denture treatment.Materials and methods: Data were collected by means of self-administered questionnaire during July 2004-January 2005 at four dental offices located in Japan. Subjects who requested implant treatment (IT) were 12, and requested conventional denture treatment (DT) were 19. OHRQoL was measured by the 16-item Oral Health Impact Profile (OHIP-JP16). The OHIP-JP16 total and subscale scores were calculated by summing the 16 items score without weighting. The mean OHIP-JP16 total scores and the mean scores of six subscales (functional limitation, physical discomfort, psychological discomfort, physical disability, psychological disability, handicap) between groups were analyzed by the Mann-Whitney U-test. Chi square tests were used compare responses to individual items. ‘Never’ and ‘hardly ever,’ (no impact) were recorded as ‘0’, ‘occasionally’, ‘fairly often’, and ‘very often’ (any impact) were recorded as ‘1’.Results: The mean age was 62.4 years old in IT and 66.6 years old in DT (p=0.596). No differences in denture status, self-perceived oral health, number of teeth were found between two groups. DT subjects had better OHIP-JP16 total scores than IT, but it was not statistically significant (p>0.05). Chi square tests were performed for each of 16 items. The number of subject reported ‘any impact’ was significantly greater (p<0.05) in IT in the following items; ‘worried’, ‘self-conscious’, ‘avoid eating’, ‘upset’ and ‘life unsatisfactory’. No significant differences were detected in the following 5 subscales; ‘functional limitation’, ‘psychological discomfort’, ‘physical disability’ , ‘psychological disability’ and ‘handicap’, while ‘physical discomfort’ was signify- cantly lower (e.g. higher QOL status) in DT.Conclusion: OHIP-JP16 scores of the subjects who requested implant treatment were significantly higher in ‘physical discomfort’ than requested conventional denture. The results of this study suggested that in the patients who requested implant treatment, OHRQoL might be lower than the patients who requested conventional denture treatment.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133029664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Namrath Chatchaiyan, K. Koide, M. Tsuchimochi, Hajime Tanji, E. Asano, Hironobu Ishii, Toshihide Sato, Mami Ishii, Atsuko Kondo, K. Ohta
The purpose of this study was to achieve optimal contrast of imaging characteristics in 4 dimensional MR images of the temporomandibular joint (TMJ) for evaluating the TMJ structures during mandibular movement. Twelve TMJs from six subjects without any TMJ dysfunction were studied. MRI was performed using a 1.5 MR system with an eight-channel phased array coil. The images were acquired using a balanced steady-state free precession (b-SSFP) sequence. The optimal flip angle was determined for differentiation for the main anatomical structures of the TMJ; the posterior band of the articular disc, the retrodiscal tissues, the condylar head, and the lateral pterygoid muscle, by examining the signal intensity (SI-d) of TMJ structures on b-SSFP MR images obtained using various flip angles. Repeated measures two-way analysis of variance (ANOVA) was performed, followed by Bonferroni's multiple comparison analysis. The main anatomical structures of the TMJ had the highest SI-d at flip angles of 30 degrees and 40 degrees, and there were the most significant differences between the SI-d of the articular disc and all other structures at a flip angle of 40 degrees, followed by a flip angle of 30 degrees. These data suggest that a flip angle of approximately 30 degrees to 40 degrees is appropriate for obtaining the optimal contrast of imaging characteristics for 4 Dimensional MR images of the TMJ with b-SSFP sequence.
{"title":"Optimal Contrast of Imaging Characteristics for 4 Dimensional MRI of the Temporomandibular Joint by Examining the Signal Intensity","authors":"Namrath Chatchaiyan, K. Koide, M. Tsuchimochi, Hajime Tanji, E. Asano, Hironobu Ishii, Toshihide Sato, Mami Ishii, Atsuko Kondo, K. Ohta","doi":"10.2186/PRP.7.222","DOIUrl":"https://doi.org/10.2186/PRP.7.222","url":null,"abstract":"The purpose of this study was to achieve optimal contrast of imaging characteristics in 4 dimensional MR images of the temporomandibular joint (TMJ) for evaluating the TMJ structures during mandibular movement. Twelve TMJs from six subjects without any TMJ dysfunction were studied. MRI was performed using a 1.5 MR system with an eight-channel phased array coil. The images were acquired using a balanced steady-state free precession (b-SSFP) sequence. The optimal flip angle was determined for differentiation for the main anatomical structures of the TMJ; the posterior band of the articular disc, the retrodiscal tissues, the condylar head, and the lateral pterygoid muscle, by examining the signal intensity (SI-d) of TMJ structures on b-SSFP MR images obtained using various flip angles. Repeated measures two-way analysis of variance (ANOVA) was performed, followed by Bonferroni's multiple comparison analysis. The main anatomical structures of the TMJ had the highest SI-d at flip angles of 30 degrees and 40 degrees, and there were the most significant differences between the SI-d of the articular disc and all other structures at a flip angle of 40 degrees, followed by a flip angle of 30 degrees. These data suggest that a flip angle of approximately 30 degrees to 40 degrees is appropriate for obtaining the optimal contrast of imaging characteristics for 4 Dimensional MR images of the TMJ with b-SSFP sequence.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124690430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Hirose, M. Ochi, Y. Nakanishi, Hideki Matsubara, Taketo Koga
{"title":"Clinical Evaluation of a Surgical Navigation System Used for Flapless Implant Surgery","authors":"Y. Hirose, M. Ochi, Y. Nakanishi, Hideki Matsubara, Taketo Koga","doi":"10.2186/PRP.7.237","DOIUrl":"https://doi.org/10.2186/PRP.7.237","url":null,"abstract":"","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123689272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Kishita, Y. Nishi, K. Tsuru, Hiromi Maruyama, Shunichi Hamamura, E. Nagaoka
The aim of this study was to compare different methods for effective adhesion between a glass fiber-reinforced composite (FRC) material for framework and a veneering composite (VC) material for coating framework when fabricating clasps (FRC clasp (with VC)). Vectris pontic and EG fiber were used as FRC materials, the glass fibers of which were preimpregnated with resin. Palfique estelite LV was used as the VC material.Laminate specimens were fabricated by coating FRC with VC (Palfique⁄Vectris, Palfique⁄EG fiber). Five adhesion methods were used when coating the framework. Three specimens were prepared for each adhesion methods. Deflection and load when VC cracked were examined using the three-point flexural test. The mean and S.D. of each value were calculated and subjected to two-way analysis of variance (ANOVA) and multiple comparisons (Bonferroni⁄ Dunn) to determine the significance of the differences (P = 0.05 and 0.01) between the results of the respective methods.The deflection of Palfique⁄Vectris and Palfique⁄EG fiber was 0.497-0.631 and 0.426-0.481 mm, respectively, the load of which was 92.33-108.00 and 60.17-72.50 N, respectively. The deflection and load under all adhesion methods were significantly higher in Palfique⁄Vectris than Palfique⁄EG fiber (P<0.01). In Palfique⁄Vectris, deflection under non-adhesion was significantly lower than under others, but there were no significant differences among loads in different adhesion methods. In Palfique⁄EG fiber, there were no significant differences among deflections and loads in all adhesion methods.In the present study, the results suggested that sandblasting could be effective to increase the amount of deflection causing VC cracking in a clasp arm.
{"title":"Application of a Glass Fiber-reinforced Composite Material to Clasps: Study on Adhesive Method of Veneering Composite","authors":"C. Kishita, Y. Nishi, K. Tsuru, Hiromi Maruyama, Shunichi Hamamura, E. Nagaoka","doi":"10.2186/PRP.7.141","DOIUrl":"https://doi.org/10.2186/PRP.7.141","url":null,"abstract":"The aim of this study was to compare different methods for effective adhesion between a glass fiber-reinforced composite (FRC) material for framework and a veneering composite (VC) material for coating framework when fabricating clasps (FRC clasp (with VC)). Vectris pontic and EG fiber were used as FRC materials, the glass fibers of which were preimpregnated with resin. Palfique estelite LV was used as the VC material.Laminate specimens were fabricated by coating FRC with VC (Palfique⁄Vectris, Palfique⁄EG fiber). Five adhesion methods were used when coating the framework. Three specimens were prepared for each adhesion methods. Deflection and load when VC cracked were examined using the three-point flexural test. The mean and S.D. of each value were calculated and subjected to two-way analysis of variance (ANOVA) and multiple comparisons (Bonferroni⁄ Dunn) to determine the significance of the differences (P = 0.05 and 0.01) between the results of the respective methods.The deflection of Palfique⁄Vectris and Palfique⁄EG fiber was 0.497-0.631 and 0.426-0.481 mm, respectively, the load of which was 92.33-108.00 and 60.17-72.50 N, respectively. The deflection and load under all adhesion methods were significantly higher in Palfique⁄Vectris than Palfique⁄EG fiber (P<0.01). In Palfique⁄Vectris, deflection under non-adhesion was significantly lower than under others, but there were no significant differences among loads in different adhesion methods. In Palfique⁄EG fiber, there were no significant differences among deflections and loads in all adhesion methods.In the present study, the results suggested that sandblasting could be effective to increase the amount of deflection causing VC cracking in a clasp arm.","PeriodicalId":306414,"journal":{"name":"Prosthodontic Research & Practice","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122970069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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