Abstract：
:The viscoelastic properties of denture base polymers, such as poly(methylmethacrylate) (PMMA), polycarbonate (PC), polysulfone (PSF) and polyethersulfone (PES) which have been used in current clinical dentistry were investigated. In addition, water absorption, diffusion coefficient of water into material, cubical expansion, specific volume and residual monomer were also determined. From the results of this study, the viscoelastic behaviours of the denture base polymers in water have been discussed. The relaxation modulus (Er(5)) which was calculated using a stress at 5 s from the start of measurement for the specimen which reached an equilibrium moisture content (wet specimen), decreased from 23.1 to 25.5% compared with that of PMMA stored in a desiccator (37 degrees C) for 1 week (dry specimen). In contrast, this decreasing ratio was 7.0 to 10.0% for PC, PSF and PES. It is suggested that this phenomenon is caused by the increase of specific volume (cm3/g) with water absorption in each material. The water absorption of the PMMA group was relatively large in comparison with other material and was 1.81-1.85%. This value was within the range from 0.38 to 1.74% for PC, PSF and PES. The diffusion coefficients of water for PC, PSF and PES increased by approximately 1.5-2.7 times that of PMMA. Furthermore, the coefficient of cubical expansion of the wet specimen was larger than that of the dry specimen. The increasing ratio was 1.03-1.10 times for the PMMA group and 1. 18-2.38 times for PC, PSF and PES. The variation of Er(5) of the PMMA group with temperature in water was larger than those of PC, PSF and PES.
journal_name
J Oral Rehabiljournal_title
Journal of oral rehabilitationauthors
Hiromori K,Fujii K,Inoue Kdoi
10.1046/j.1365-2842.2000.00545.xkeywords:
subject
Has Abstractpub_date
2000-06-01 00:00:00pages
522-31issue
6eissn
0305-182Xissn
1365-2842journal_volume
27pub_type
杂志文章abstract：:This study investigated the subjective symptoms of craniomandibular disorder and the restriction in maximal mandibular opening of 891 elderly Singaporean citizens. A distribution of 22% of subjects (20% of the women and 26% of the men) reported subjective symptoms of craniomandibular disorders. The most common single ...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1995.tb00794.x
更新日期：1995-06-01 00:00:00
abstract：:The purpose of this study was to examine the longitudinal changes of torque around the sagittal axis in lower distal-extension removable partial dentures. The torque transmitted from the denture base to retainers was measured on several separate occasions from the insertion of new dentures to about 2 months after it. ...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1993.tb01602.x
更新日期：1993-03-01 00:00:00
abstract：:It is well known that acid regurgitated from the stomach into the mouth will erode teeth. Conditions such as anorexia and bulimia nervosa, chronic alcoholism and gastric disturbances cause palatal dental erosion. The common factor in these conditions is the role played by the stomach and oesophagus in the acid movemen...
journal_title：Journal of oral rehabilitation
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doi：10.1111/j.1365-2842.1996.tb00855.x
更新日期：1996-05-01 00:00:00
abstract：:The fracture strengths of stylized all-ceramic crowns manufactured using an yttrium-oxide-partially-stabilized (Y-TZP) zirconia ceramic core (Denzir) veneered with lithium disilicate glass-ceramics (IPS Empress 2 or IPS Eris) were evaluated. The Denzir cores were manufactured in two ways: either with different thickne...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2004.01284.x
更新日期：2004-07-01 00:00:00
abstract：BACKGROUND:Tongue muscle strength is important for swallowing but decreases with age, in association with reduced skeletal muscle mass. However, the relationships between pharyngeal dynamics and both skeletal muscle mass and tongue muscle strength are unknown. OBJECTIVE:To investigate the effect of reductions in tongu...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/joor.13120
更新日期：2021-02-01 00:00:00
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journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2006.01608.x
更新日期：2007-01-01 00:00:00
abstract：:It has been suggested that occlusal interference results in masticatory muscle dysfunction. In our previous study, occlusal interference reduced the rat masseter energy level during masticatory movements. The purpose of this study was to investigate the histological alterations of rat masseter muscles following experi...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：
更新日期：2001-03-01 00:00:00
abstract：:There is a methodological problem in analysis of data belonging to different hierarchical levels, e.g. patient, arch, and tooth. A method for multilevel modelling (MLM) that resolves this problem is available. This method which is presented in this article, was used to reanalyse previously published long-term treatmen...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1998.00248.x
更新日期：1998-04-01 00:00:00
abstract：:The purpose of this study was to evaluate the efficacy of a number of additives to acid conditioners at reducing the denaturation of dentine collagen. Dentine collagen is normally not very susceptible to trypsin attack. After denaturation, however, it becomes more susceptible to the action of trypsin. Slabs of human d...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1046/j.1365-2842.2000.00492.x
更新日期：2000-02-01 00:00:00
abstract：:Although knowledge of short-range kinetic interactions between antagonistic teeth during mastication is of essential importance for ensuring interference-free fixed dental reconstructions, little information is available. In this study, the forces on and displacements of the teeth during kinetic molar biting simulatin...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/joor.12501
更新日期：2017-05-01 00:00:00
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journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2009.02012.x
更新日期：2009-12-01 00:00:00
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journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1990.tb01393.x
更新日期：1990-01-01 00:00:00
abstract：:More studies evaluating the outcome of short-length dental implants in immediate loading are needed. To evaluate the use of short-length tapered implants in immediate loading for complete edentulous maxillae rehabilitations using an All-on-4 design. This retrospective clinical study included a cohort of 43 patients wi...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/joor.12291
更新日期：2015-08-01 00:00:00
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journal_title：Journal of oral rehabilitation
pub_type： 杂志文章,评审
doi：10.1111/j.1365-2842.1995.tb00216.x
更新日期：1995-10-01 00:00:00
abstract：:Dysphagia rehabilitation in the elderly includes direct therapy to alter the three-dimensional shape of the oropharynx so that food boluses can pass safely through the poorly functioning pharynx. Alteration of the mandibular position is thought to affect oropharyngeal shape, but this relationship remains poorly unders...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2011.02263.x
更新日期：2012-04-01 00:00:00
abstract：:A technique has been developed for the preparation of test bars of the different types of aluminous porcelains using the standard laboratory procedures for the preparation of aluminous porcelain jacket crowns. Up to now the investigation of the properties of dental porcelain has been conducted using test specimens pro...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1981.tb00489.x
更新日期：1981-03-01 00:00:00
abstract：:High-intensity eccentric-concentric contractions of the jaw-closing muscles induce muscle soreness, fatigue and functional impairment of the jaw, resembling the symptoms of myalgia, according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). However, it is claimed that repetition of similar exercise...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/joor.12656
更新日期：2018-08-01 00:00:00
abstract：:The periodontal regeneration of interproximal bone defects of the posterior teeth produced by guided tissue regeneration (GTR), with expanded Polytetrafluoroethylene barrier membranes and conventional therapy, was clinically evaluated in 20 intrabony periodontal defects in 10 patients. The material included the presen...
journal_title：Journal of oral rehabilitation
pub_type： 临床试验,杂志文章
doi：10.1046/j.1365-2842.1996.d01-206.x
更新日期：1996-09-01 00:00:00
abstract：:The following review of the literature considers various clinical methods for evaluating dental materials. The first section looks at studies that have considered the general handling properties of dental materials in clinical practice (the pragmatic trial). The second section considers studies that have used retrospe...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章,评审
doi：10.1046/j.1365-2842.1997.00437.x
更新日期：1997-02-01 00:00:00
abstract：:The aim of these clinical reports was to describe two different approaches to prosthetic rehabilitation after facial disfigurement because of a total rhinectomy. A man with a total rhinectomy was scheduled for craniofacial implants in the nasal residual defect. Three oral implants were used instead of craniofacial one...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2007.01684.x
更新日期：2007-04-01 00:00:00
abstract：:To investigate whether there are differences in patients' denture satisfaction when an implant placed in the midline of the edentulous mandible is loaded either immediately or three months later, after second-stage surgery. One hundred and fifty-eight edentulous patients received a single implant in the midline of the...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章,多中心研究,随机对照试验
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更新日期：2017-03-01 00:00:00
abstract：:The aims of this study were to observe the release of fluoride ions (F-) from GC-Fuji Lining-LC(R) glass-ionomer cement, to assess the diffusion process, and to measure fluoride diffusivity (D) in the set cement. Specimens of various dimensions and shapes, ranging from discs to cylindrical rods, were fabricated for bo...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1046/j.1365-2842.2000.00554.x
更新日期：2000-07-01 00:00:00
abstract：:The purpose of this study was to evaluate the surface micromorphology of resin modified glass-ionomer cements and flowable compomers. In the study two resin modified glass-ionomers and two flowable compomers were used to prepare standardized 20 cylinderic samples. Samples were divided into four groups. Surface treatme...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2005.01484.x
更新日期：2005-09-01 00:00:00
abstract：:The clinical and pathological study was performed in order to determine the histopathological and cytoimmunological characteristics of denture stomatitis. All specimens were biopsy materials from seventeen patients with denture stomatitis. Normal palatal mucosae from ten patients served as the control. In addition to ...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1987.tb00747.x
更新日期：1987-11-01 00:00:00
abstract：:Restoring broken down non-vital teeth implies in general the provision of a post and core foundation. Many materials and techniques have been introduced for this purpose in recent years. In this article the advantages and disadvantages of the cast and the non-cast post and core are discussed. The problems involved wit...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1987.tb00687.x
更新日期：1987-01-01 00:00:00
abstract：:The aim of this in vitro study was to evaluate the yield strengths of glass fibre-reinforced composite (FRC) posts and zirconia dioxide ceramic (ZDC) posts. Tapered glass FRC posts (DentinPost) and ZDC posts (Cerapost) of three sizes in diameter (ISO 50, 90, 110) were used for bending tests. Conventional prefabricated...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2006.01526.x
更新日期：2006-01-01 00:00:00
abstract：:Signs and symptoms of temporomandibular dysfunction (TMD) and functional recordings were re-examined in subjects, 19-21 years of age, 5 years after the first examination. Thirty-seven subjects had restored dentitions at both examinations (group F), 13 subjects with previously intact dentitions had had fillings in thei...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.1991.tb01683.x
更新日期：1991-09-01 00:00:00
abstract：:The corrosion tendencies of metals are related with their position in the electromotive series. These electrode potential degrees may change due to the compositions of the alloys, the surrounding media, or due to alterations in the composition because of recurrent casting. Therefore in this research, the electrode pot...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1046/j.1365-2842.1998.00305.x
更新日期：1998-10-01 00:00:00
abstract：:The aim of the present study was to study the mineral formation on a phosphorylated dental bonding agent using a mineralization inductive solution. Clearfil Photobond, which contained phosphate monomer, was cured by photo-irradiation and heat treated, and was then immersed in Hanks' balanced salt solution (HBSS) with ...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1111/j.1365-2842.2004.01135.x
更新日期：2004-01-01 00:00:00
abstract：:Contracture of jaw-closing muscles is one of the causes of limitations of jaw opening. In contracture patients who have no history of trauma or infection, it is not easy to distinguish contracture from temporomandibular joint (TMJ) closed lock (TCL). The purpose of this study was to clarify whether there is any differ...
journal_title：Journal of oral rehabilitation
pub_type： 杂志文章
doi：10.1046/j.1365-2842.2002.00965.x
更新日期：2002-11-01 00:00:00
