摘要:

SummaryAn examination of the temporomandibular joints, masticatory musculature and related structures was made on 1069 persons working in a ship‐building yard in the south of Sweden. One‐fifth of the persons reported that they had frequent headache and one‐fourth of the persons reported TMJ‐sounds.Clinical examination of the temporomandibular joints and masticatory musculature showed that clicking of the TMJ was the most common symptom (65%) followed by tenderness of the masticatory musculature to palpation (37%) and tenderness of the temporomandibular joint (10%). Thirty per cent of the persons examined reported two or more of these symptoms. Severe abrasion was noted in 12%.The results of the investigation suggested that the frequency of diseases related to function of the masticatory system is high. It was estimated that some 25–30% of the persons examined were in need of

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01532.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SummaryThe basic principles of tooth preparation for full coverage are discussed and an efficient method is described for the operative procedure. The purpose of each of the four stages in this technique and of the five different diamond instruments which are used in their performance, is discussed. Modifications of the procedure are given for posterior and anterior teeth as well as for teeth with periodontal involvement. Comparing the relative merit of different types of finishing lines, the chamfer type was found most suitable for the majority of preparations.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01533.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SummaryA simple and reliable method for the determination of the tensile bond strength of sealant materials to enamel is described. Using this method, the tensile bond strength of Nuva Seal to enamel after 7 days in water at 37°C was found to be 36·6±9·0 kg/cm2with a coefficient of variation of 24·5%. This method would be useful for screening of new and modified sealant materials and the evaluation of new application procedures to ensure an adequate tensile bond strength for clinical use. A tensile bond strength in the range 26–36 kg/cm2could be used as the base line value for comparison of new materials and procedures involving fissure se

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01534.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01535.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SummaryScanning electron microscopic investigations were conducted to determine morphostructural alterations on denture base resin surfaces after immersions in commercially available oxygen liberating denture cleansers. The topography of properly processed denture resins did not show corrosive effects, whereas inconsistent surface characteristics of improperly processed wet‐mix acrylates could suggest less resistance. In spite of thorough rinsing after immersion, deposits were noted on the resins of varying amount, size, and quality according to the cleanser used. A possible clinical relevance of such deposits is yet to be evaluate

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01536.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SummarySix intraarticular discs from the temporomandibular joints of three miniature swine were examined for the distribution and orientation of elastic fibres. Elastic tissue was abundant in the posterior portion of the disc, less tissue was seen anteriorly and marginally and the least amount in the central portion.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01537.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SummaryThe rather exacting aesthetic requirements of dental restorations has largely dictated the composition of dental ceramic materials. The so‐called dental porcelains have evolved from the traditional whiteware formula of feldspar, clay and quartz. One of the first variables which might be considered is that of chemical composition. It is, however, generally accepted that for ceramic materials small variations in composition are not critical. Since the early work of Watts in 1918, little interest has been expressed in the chemical composition of dental porcelain.The composition of traditional dental porcelains has evolved over a period of many years by practical trial and error, as discussed by Jones (1971). The development of dental porcelains advanced to the point where any major improvements in physical properties could only be achieved by major changes in composition and technique as advocated by McLean&Hughes (1965). The resulting alumina/glass composites which have been developed use a technique which involves the build up of an inner core which contains a high proportion of crystalline alumina (45–50 %) embedded in a glass matrix surrounded by a transparent outer veneer.This work compares the effect of such inter‐related variables as composition, inclusion of filler, viscosity, texture, hardness, and strength of the fired pr

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01538.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SummaryIn thirty patients (24 women and 6 men) treated because of dysfunction of the masticatory system at the department of Stomatognathic Physiology, University of Gothenburg, bite force was registered before, during and after treatment had been completed. In the controls, thirty‐six dental students and trainee dental nurses, with no dysfunction of the masticatory system, bite force was registered on two occasions.Bite force was measured between the first molars on each side and between the central incisors. Also finger force was registered. The force measurements were made at five different levels, increasing from very weak to maximum force. Repeated tests of bite force in the control group, made at intervals of about 1 week, gave almost identical results. Bite force in the patient group was lower than in the control group at the first registration but increased with palliation of the symptoms during treatment. There was no significant difference in bite force between the affected and the unaffected sid

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01539.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

Summary1A two‐year double‐blind human clinical study has been conducted to determine the comparative effect of two commercially available dentifrices on selected dental materials.2Forty‐three adult subjects were selected to participate. They received either acrylic resin or silicate restorations in their anterior teeth, or a full cast gold veneer crown with an acrylic surface.3The subjects were randomly assigned to either one of the two dentifrices and utilized the dentifrice in their normal manner at least 3 times per day.4The dental restorations were clinically evaluated in reference to their surface characteristics immediately after placement, and after 3, 6, 12 and 24 months' use of the dentifrices. The acrylic surfaces of the veneer crowns were also evaluated at these same time periods; however, in this case anin vivotooth surface reflectance measurement technique was also utilized.5The results of this clinical study provide the following conclusion after 24 months use of the two dentifrices: There was no difference between the two dentifrices in that neither dentifrice produced any abnormal or unusual effect on the surface characteristics of either the acrylic or silicate anterior restorations, or the acrylic surfaces of the veneer c

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01540.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1975.tb01541.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY