摘要:

SummarySpecific features related to the development, design and use of the Michigan splint have been described. Additional benefits from the Michigan splint beyond what can be expected from conventional stabilization splints and bite planes have been suggested. Important aspects of corrections and maintenance care of the Michigan splint have been stressed.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01164.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryTo standardize clinical history taking, a comprehensive anamnestic questionnaire was developed (Screen). Screen includes questions about (i) pain, (ii) other symptoms of CMD, (iii) correlates of CMD, (iv) psychosocial factors, and (v) general health. Variables discriminating between subgroups of clinical cases and controls were described successively. This study was performed to assess whether subgroups of patients with signs and symptoms of craniomandibular dysfunction (CMD), and a control group of dental patients with and without signs and symptoms of CMD, can be characterized by differential report of signs and symptoms of CMD, as reported in Screen. Results indicate that Screen can be used to discriminate between (i) subgroups of subjects with signs or symptoms of CMD (both clinical cases and controls) and controls without signs or symptoms of CMD; (ii) subgroups of clinical cases and controls with signs and/or symptoms of CMD; and (iii) patients with CMD with mainly a myogenous component and patients with CMD with mainly an arthrogenous component. Differences between patients and controls are interpreted with regard to the correct classification of patients with CMD with mainly a myogenous component and patients with CMD with mainly an arthrogenous component, and with regard to the subjective treatment need for CMD. The results of logistic regression analyses indicate that subsets of items of Screen correctly classified up to 80% of patients with myogenous or arthrogenous CMD. Implications for further research were discussed.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01165.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryTo standardize clinical history taking, a comprehensive anamnestic questionnaire was developed (Screen). Screen includes questions about: (i) pain, (ii) other symptoms of craniomandibular dysfuntion (CMD), (iii) correlates of CMD, (iv) pychosocial factors, and (v) general health. The current study focuses on variables in Screen concerning pain reported somewhere in the head, neck and/or shoulders. This study was performed to assess whether subgroups of patients with signs and symptoms of CMD and a control group of dental patients with and without signs and symptoms of CMD can be characterized by differences in areas reported to be painful, in quantitative and qualitative characteristics of pain, and in factors exacerbating pain. Results indicate that several characteristics of pain as measured in Screen can be used to discriminate between: (i) subgroups of subjects with signs and/or symptoms of CMD and controls without signs or symptoms of CMD, (ii) subgroups of clinical cases and controls with signs or symptoms of CMD, and (iii) patients with CMD with mainly a myogenous component and patients with CMD with mainly an arthrogenous component. The results of logistic regression analysis indicate that four adverbs describing pain correctly classified 75% of patients with CMD‐myo and patients with CMD‐arthro. Differences between patients and controls are interpreted with regard to the correct classification of patients with CMD with a mainly myogenous component and patients with CMD with a mainly arthrogenous component and the subjective treatment need for CMD. Implications for further research are discus

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01166.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryThe purpose of this investigation was to examine the effects of thermocycling upon the compressive strength and abrasive wear resistance of three commercial composites Fulfil®, P‐50® and Herculite‐XR®. Specimens of each material were divided into five treatment groups comprising a control, and four different cycling and storage regimes. Tests for compressive strength and wear resistance were carried out. Prior to testing all specimens were stored in distilled water for 1 week. Three groups were stored at a temperature of 37°C and the remaining two at 60°C. Thereafter all groups that were thermocycled were subjected to 750 cycles of a thermocycling regime consisting of the cycle ACAB where A and B represent the fixed temperatures of 37°C and 5°C, and C, depending upon the treatment group, either 50°C or 60°C.One‐way analyses of variance upon the compressive strength and wear factor data following the treatments highlighted significant differences in the mean compressive strength for all materials (Fulfil (P<0.05), P‐50 and Herculite‐XR (P<0.01)) and in the wear factor values for only Fulfil and P‐50 (P<0.001). Surprisingly, thermocycling P‐50 with an upper temperature limit of 50°C had catastrophic consequences upon the measured properties.It is concluded that some of the observed behaviour may have potentially detrimental consequences upon the long‐term clinical durabilit

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01167.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryParticle sizes obtained with progressive chewing cycles were quantified by use of an optical scanning device and compared with the sieving method. The aim of this study was to validate the optical method by comparison with sieving using a natural test food, almond. Masticatory efficiency was assessed in six dentate subjects. The almonds were chewed for 1, 4, 8, 16 and 32 chewing strokes. Each experiment was replicated. The chewed material was sieved through a 1 mm aperture sieve on a Büchner funnel and dried after washing with water and 100% alcohol. The dried particles were weighed and scanned by an optical scanning device for number and size. The same samples were sieved and weighed with a conventional sieve method. The results of both methods were described by particle size distributions based on the volume of particles. The results derived from the optical scanning and sieving showed similarity. It can be concluded that the optical method is simple to use, faster than sieving and needs little skill in the use of equipment. The comparison of the results validates both methods

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01168.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryFresh and used photographic fixer, Merconvap® and water were evaluated for their ability to suppress the vapourization of mercury. Mercury vapour concentration above the four test storage liquids was measured at various times between 10 min and 335 days, using a mercury vapour measuring instrument. The data were analysed using a Student‐Newman‐Keuls multiple comparison test (P= 0.05). The results showed that fresh and used fixer and Merconvap® suppressed the vapourization of mercury to below the detection limit of the measuring instrument (0.01 mg/m3). Water was much less effective compared with the other liquids and showed an increase in mercury vapour concentration with

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01169.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryDuring maximum clenching in the intercuspal position, surface electromyograms of left masseter and anterior temporal muscles were sampled in 16 healthy subjects with natural dentitions to establish a four‐order, autoregressive (AR) moving‐average (MA) model of the myoelectrical signals. The correlation coefficients and the linear regresssion between the model parameters and the clenching time were calculated. The model parameters had the positive or the negative correlation, and AR model parameters had the higher correlation than MA model parameters. The model parameters relate to muscular fatigue and the slope of the regressive equation relates to the endurance time of the isometric contract

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01170.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryThe influence of porcelain thickness and opacity on the polymerization of two dual activated (microfine and hybrid) and one light irradiated (hybrid) resin cements was assessed by hardness measurements. The surface microhardness values of the upper and lower surface of l mm thick resin cement specimens were determined. Specimens were polymerized using 40 s irradiation beneath different thicknessses and opacities of porcelain discs. The results showed that increasing the thicknesses and opacity of the porcelain produced a statistically significant decrease in microhardness of the resinbased cements. The effect of attenuation is less for the microfine cement than for the hybrids. In the case of hybrid cements, the light activated material performed better than the dual activated cement.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01171.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryThis study compared the electrical conductivities, pH and leached ion (F−, Ca, Al, Si) concentrations in supernatant liquids obtained from four glassionomer cements, a buffered ionomer cement, a polycarboxylate cement and a zinc phosphate cement, at three different levels of settings. The result indicated that the measured parameters are highest for the unset condition of cements and decreases as the set condition is approached, except for pH, which shows the opposite trend. Two pulp sensitive glassionomer cements, Chem Bond and Ketac Cem showed high Ca : F ratios as well as high Ca and F concentrations. Further, it is suggested that the cytotoxicity of leached F−, Si, Al and Zn at high concentration and at low pH may induce sensitivity in tooth struct

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01172.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

SummaryEffects of soft lining materials on the growth and/or acid production ofCandida albicanswere investigated using a simplified method monitoring the pH change in the growth medium. Reverse sigmoidal pH curves were observed with all samples and, as compared with acrylic, all soft lining materials inhibited fungal growth or acid production in the following way, i.e. delay of the beginning of a rapid and linear decline in pH, decreases in the rate of linear change in pH and increases in minimum pH.Further examinations using a surface‐modified glass tube revealed that the order ofCandidagrowth agreed with the relative hydrophobicity and adherence capacity of substrates, suggesting that this adherence capacity affected the yeast growth on their surfaces.Besides adherence capacities of substrates, the powder, liquid and plasticizer of some soft lining materials directly inhibitedCandidagrowth. Thus, the results obtained here revealed that several factors within soft lining materials affectedCandidagrowth and/or acid productio

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1994.tb01173.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY