摘要:

SummaryA total of 203 resin‐bonded bridges were inserted under controlled clinical conditions and evaluated over a period of 5 years. The study included two experiments to test the influences of retainer type, cementation material and operator on the success rate of resin‐bonded bridges. The overall survival at 5 years was 75%. Micromechanical retainers were better than macromechanical retainers. For inserting micromechanical retainers, the cementation materials Clearfil F and Panavia Ex were better than Conclude. An operator effect was not found in this st

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01361.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryThe flexure strength of the joint between layers of different types of amalgam condensed consecutively one on to the other was evaluatedin vitro. The data indicated no statistical differences in flexure strength between the combined samples (single composition spherical and lathe‐cut eutectic amalgams) and the control (homogeneous lathe‐cut eutectic amalg

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01362.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryThe balance in the electromyographic (EMG) activities of the left and the right masseter and the left and right anterior temporal muscles during chewing and during submaximal clenching at 10% and 50% of the maximum voluntary contraction in the inter‐cuspal position was investigated in twenty healthy adults. Muscular asymmetry patterns during chewing and clenching were positively correlated for both pairs of masticatory muscles investigated at the 50% level (P<0.01‐P<0.001) and for the masseter muscles, also at the 10% level (P<0.01). Stronger correlations in muscular asymmetry were found for the masseter muscles and at the higher submaximal clenching level. In general, the masseter muscles displayed a greater degree of asymmetric activity than the anterior temporal muscles during both chewing and clenching (0.05

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01363.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryIn this experiment hydroxylapatite‐coated dental implants were submitted to a wear test in order to study their resistance to toothbrushing. After 20,000 double brush strokes the coating had disappeared in some places. It was concluded that the wear resistance of the coating was not good enough to withstand longer brushing period

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01364.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryThe solubility of four dental cement bases was measured in simulated dentinal fluid and distilled water to evaluate the relevancy of the American Dental Association solubility test for cement bases in contact with vital dentine. A simulated dentinal fluid was formulated utilizing glucose, distilled water, and sterile human plasma. Cement‐base samples were immersed in either distilled water or simulated dentinal fluid at 37°C in a shaker water‐bath for 1, 2, or 3 months. Weight loss values were compared utilizing a three‐way analysis of variance. Zinc oxide‐eugenol cements were significantly more soluble in simulated dentinal fluid than distilled water, while the calcium hydroxide cement bases were significantly more soluble in distilled water than simulated dentin

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01365.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryFunction and comfort during wearing of myodynamically and conventionally constructed dentures were evaluated in 30 patients. All patients were fitted with one set of myodynamic and one set of conventional dentures. The neutral zone was recorded with a Xantopren® blue impression. Twenty‐three of the patients preferred the myodynamic dentures, two preferred the conventional dentures, two experienced no difference and three patients used a combination of the conventional and the myodynamic sets. There were also less post‐insertion problems with the myodynamic dentures compared to the conventional

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01366.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryThe loss of material from specimens of three luting cements was measured after continuous erosion cycling in the laboratory. The glass ionomer luting cement showed significantly less material loss than the zinc polycarboxylate and zinc phosphate luting cements.Two hundred and fifty restorations cemented with one of the three materials were studied clinically for marginal integrity and retention over 3–5 years. The data were tested using survival analysis. Zinc phosphate cement gave the best clinical performance. Possible explanations for the poor correlation between the findings in the laboratory and clinical study are discusse

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01367.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryGlass ionomer restorative cements have been used in anterior restorations for a number of years but have not been considered strong enough for use in posterior restorations. The compressive strengths of a number of materials currently available were measured at 30min, 1 hour and 24 hours. It was concluded that some of the materials might be considered for posterior restorations in deciduous teeth where no other considerations, such as radiopacity, apply.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01368.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryThe relationship between the position of the buccal cusps of the natural upper posterior teeth and the distance between the lateral arms of the Gothic arch tracing or the distance between the upper canine teeth has been found to be constant to within ±2mm. This may be of value when setting up artificial teeth for denture patients, enabling them to be positioned close to the natural predecessors

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01369.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY

摘要:

SummaryThe objectives of this study were: (i) to determine variability among colour parameters of five different ceramic crown systems; and (ii) to measure the effect of using coloured luting agents on restoration colour. The crown systems studied were Cerestore, Dicor, Hi‐Ceram, Renaissance, and Vitadur‐N. Five crowns for each system were made according to manufacturer's instructions with the same nominal shade (Vita LuminVacuum A2) to fit an Ivorine central incisor tooth. Restoration thickness was adjusted to within ±0.1mm (±0.05mm in the mid‐facial area where colour measurements were to be made) with the aid of a dial calliper prior to glazing or, in the case of Dicor, surface staining. Where a core was part of the system this was fabricated to the minimum recommended thickness. The crowns were cemented using luting agents of five different colours in a randomly chosen sequence. The colour of each restoration/cement combination was measured three times using a small‐area colorimeter (Minolta CR‐121). The variance of each colour parameter (L*,a*,b*) was statistically compared for each crown system using an analysis of variance procedure, as was the effect of the cement. Observed differences were related to visual perception by using the colour difference formula. There were statistically significant differences among the variances of the crown systems and the cements, with significant interactions between crown systems and direction of colour and between‐ cement and direction of colour. Restorations made with different ceramic crown systems had noticeably different colour despite having the same nominal shade. Changing the shade of the luting agent had a perceivable effect on Dicor crowns and, to a lesser extent, on Vitadur‐N crowns but not on the other systems due, presumably, to the opacity of their

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1989.tb01370.x

出版商:Blackwell Publishing Ltd    

年代:1989

数据来源: WILEY