摘要:

SummaryA recently marketed direct filling resin, Isosite, does not have an inorganic filler. This material is offered as a hand‐mixed, two‐paste system (Isopast) and is also available in capsulated form and as an ultraviolet activated sytem. Since it is well known that direct filling resins used hitherto are capable of causing pulpal irritation, especially in deep cavities, the pulpal response to Isopast was investigated. The experimental animals were twenty‐four vervet monkeys (Cercopithecus aethiops). Under general anaesthesia a labial cavity was cut in each of the eight incisor teeth (maxillary and mandibular) of each animal. In each animal two cavities were filled with unlined Isopast, two with Isopast over a lining of calcium hydroxide cement, two with silicate cement and two with zinc oxide/eugenol cement. The animals were killed at intervals of 2, 28 and 56 days. The teeth recovered were decalcified and stained for histological examination. Of the total of 192 specimens sixty‐five were discarded, two because of accidental pulpal exposure, one because of leakage and sixy‐three because of technical defects in the preparation of the material, leaving 126 specimens available for assessment. This was done independently by three examiners who did not know which materials had elicited the reactions observed. It was found that after 2 days unlined Isopast caused more pulpal disturbance than other materials. After 28 and 56 day intervals lined Isopast caused less disturbance than the other materials. The maker's recommendation that linings should be used is

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01456.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryThe aim of this investigation was to study intra‐assessor reliability and the relationship between individual and simultaneous evaluations when retention and stability of complete prostheses and the condition of the residual ridges were clinically assessed according to defined criteria. Further, inter‐assessor reliability and the reliability of simultaneous evaluations were studied by evaluating the condition of the residual ridge on two occasions. Nine patients and three prosthodontists participated.Generally, the reliability levels were low and individual deviations from the simultaneous evaluations were com

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01457.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryAn apparatus is described for the preparation of standardized cavities in the canine teeth of ferrets. One hundred cavities were cut, and there was highly significant correlation between the distance the bur was advanced (machine depth) and the cavity depth in dentine. It was possible to cut cavities predictively with small and large residual dentine thicknesses. The method described was not damaging to the pulp.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01458.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryThe relationship of plaque accumulation to two different designs of a proximal minor connector, was studied in twenty‐seven removable partial denture wearers. On thirty proximal surfaces adjacent to a closed space design, and on thirty‐two surfaces adjacent to an open space design, plaque formation was recorded using a plaque scoring system. Mean plaque scores were calculated separately for the two types of design, and no difference was found between the two sets of sco

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01459.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryBecause of difficulties encountered by students in determining the occlusal plane at the registration stage of full denture treatment, a simple technique which can be easily taught has been devised. Review of literature revealed a wide variety of landmarks and techniques advocated by various authorities and these are discussed. A technique using direct vision is described and a review of a series of patients showed it to be valid for the majority of cases.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01460.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryGlass ionomer cement (ASPA®) was inserted in unconditioned class V cavities or in contact with polished ground surfaces of enamel and dentine in twelve teeth. Ground sections of all teeth were examined by microradiography, and four of the sections submitted to electron probe microanalysis. A narrow outer zone of increased radiopacity in the dentine walls was explained by a 5−10% increase of Ca and P. In some sections this zone covered a partly demineralized subsurface zone. The concentrations of F and Al in enamel and dentine were ∼0.3% and 1.5%, respectively, decreasing to<0.1 % at a distance of 16–80 μm (F) and 8–24 μm (A) from the surface. Both F and Al penetrated deeper into the dentine than into the enamel. Decreased Zn values, sometimes concomitant with increased Ca, P and Mg values, were in some instances observed in an outer narrow zone of the dentine walls. It is assumed that like silicate cement, glass ionomer cement must have anticariogenic properties, due to uptake of F and Al in ca

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01461.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryA sensitive,in vitromethod has been developed for the study of bacterial adsorption to dental crown and bridge cements. The method employs heavily radiolabelled cells which adhere to the wall in wells made from the cements. Loss of radioactivity from the bacterial suspension during incubation is used to measure the degree of bacterial adherence to the materials.Strains ofStreptococcus sanguisandStreptococcus mutansadhered in greater numbers than a strain ofStreptococcus salivariusto both a zinc phosphate cement and a zinc carboxylate cement. The zinc phosphate cement supported adherence to a greater degree than did the zinc carboxylate cement. Pretreatment of the cement surfaces with human saliva tended to reduce bacterial adherence. Pretreatment of the bacteria with saliva slightly enhanced sorption ofS. sanguisandS. salivarius, but tended to impair sorption ofS. mutansto both types of cements. When both bacteria and cements had been pretreated with saliva, a strong inhibition of the adherence ofS. mutanswas observed.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01462.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryThe results are presented of research into the efficiency of various forms of dental burs. This research was carried out at the Delft University of Technology in collaboration with the Subfaculty of Dentistry of the Free University of Amsterdam. The process efficiency was measured during burring of both human teeth and amalgam plugs, with diamond burs and tungsten carbide burs at different speeds and diameters of the bur. Only the efficiency of the cutting process was evaluated, disregarding a number of other essential aspects of the burring process, such as the remaining surface quality after burring and the vibrations generated during burring.

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01463.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryIn an effort to explain the aetiology of early temporomandibular joint (TMJ) injuries, their incidence in children born by vaginal breech delivery and possible correlation with such deliveries were investigated.The study covered 156 children aged from 4 to 6 years, eighty‐three of them born by vaginal breech delivery under application of the classical Mauriceau manoeuvre in seventeen cases and the Bracht manoeuvre in sixty‐six. Seventy‐three children delivered spontaneously in vertex presentation served as the control group.Signs of TMJ injury were found in 59.6% of the total group, the by‐birth percentages being 67.5 in those after breech delivery and 50.7 in those after spontaneous delivery—the difference is statistically significant.The difference was even more significant for the more severe TMJ disorders, their percentages being in two groups respectively 48.2 and 29.7. In the children born by breech delivery the TMJ disorders were invariably attended by severe forms of distocclusion, among which the unilateral form deserves particular attention.The authors conclude that vaginal breech delivery is probably among the factors responsible for early TMJ abnormalities. They call the attention of paediatricians and obstetricians to this fact and urge examination of this joint as a very important part of oral examination in children born by vaginal breech

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01464.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

SummaryFluoride concentration of fissure enamel from unerupted third molars was higher than that of the cervical‐lingual but not cervical‐buccal surfaces at a similar depth of the removed enamel. The highest fluoride concentration was found in the fissure enamel due probably to its earlier formation, higher permeability and embedding tissue before erupt

ISSN:0305-182X    

DOI:10.1111/j.1365-2842.1980.tb01465.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY