摘要:

Abstract –Pulps of 58 human premolars were amputated under standardized conditions, and standardized amounts of dressings containing 4 or 19% formaldehyde solutions, 35% cresol or formocresol, were applied to the wound surface. Tissue reactions were studied after 4, 8 or 16 d using enzyme histochermical and routine histologic techniques. The results showed that formaldehyde fixed the tissuein vivo, the extent of fixation being dependent on the concentration of formaldehyde. Fixation did not reach the apical foramen. Formaldehyde also caused vascular changes at varying distances from the fixed tissue, indicating transport of formaldehyde via the vessels, Cresol caused necrosis and vascular changes limited mainly to the upper portion of the root pulp. Application of formocresol resulted in devitalization of the whole or almost the whole of the root pulp within 4 d, accompanied by complex vascular changes, depending mainly on the formaldehyde component. Root pulp exposed to formocresol for 5 min only showed partial devitalization due to compromised blood flow, while practically no fixation occurred. The inflammatory response to formocresol and its components was remarkably limite

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00691.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The pulpal reactions to amalgams with relatively high Cu content were compared with a conventional amalgam placed in unlined cavities prepared in intact monkey teeth. After a 1‐week observation period the pulpal responses from one of the Cucontaining amalgams and the conventional amalgam were of the same magnitude, whereas the two other amalgams gave more pronounced reactions. After observation periods of 1 and 2 months only oneo(the amalgams with high Cu content caused more pronounced reactions than the conventional amal

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00692.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –A comparative analysis of bone mass in the mandible and the iliac crest has been carried out in autopsy specimens from 30 subjects aged 23–84 years. Microradiograms of standardized 100‐μm‐thick sections of the undemineralized plastic embedded material from the two locations were used for quantitation. The following measurements were carried out by electronic point‐counting: 1) the percentage of cortical bone mass in the subperiosteal and subendosteal layers, 2) mean cortical width, and 3) the percentage of trabecular bone mass in die iliac crest. Positive correlations were found in the expressions of bone mass within the mandible; the values were significantly higher in the 200‐μm‐thick subperiosteal layer than in the remaining part of the mandibular cortex. Only a poor or no correlation was found in the expressions of bone mass from the two sites. The investigation, therefore, shows that bone mass and cortical width in the mandible cannot be predicted from a biopsy from the iliac crest. This finding may partly be due to different age‐dependent functional changes

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00693.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –A comparative analysis of bone mass in the mandible and the metacarpal index: (D–d)/D% has been carried out on autopsy specimens of mandibles and standard hand radiographs from 40 subjects aged 20–90 years. Microradiograms of standardized 100‐μm‐thick sections of the undemineralized plastic embedded material from a standard site of the mandible were used for quantitation of 1) percentage of cortical bone mass, 2) mean cortical width (MCW), 3) largest mandibular width (K), and 4) corresponding width between the endosteal surfaces (k). The outer (D) and inner (d) shaft diameter of the second right metacarpal were measured on the hand radiographs. The present study indicates that: 1) K, k and (K– k)/K% are unsuitable for revealing any possible age‐related bone loss in the mandible; 2) a positive correlation exists between bone mass and MCW, while 3) MCW and K are unrelated, 4) bone mass and MCW of the mandible are both significantly correlated to the metacarpal index. However, while the levels of bone mass and MCW in the mandible to some extent can be predicted from that of the metacarpal index, a knowledge of the precise rnandibular changes necessitates the study of a man

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00694.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The silent period in the masseter and in the anterior portion of the temporal muscle during tooth tapping, the rate of tooth tapping and the jaw jerk reflex evoked by a tap on the chin were compared in individuals with oral implant bridges and with natural teeth. Thirteen women with osseointegrated oral implant bridges in one or both jaws, aged 42–59 years, were compared with 10 women, aged 42–64 years, with natural teeth. There was no difference between women with implant bridges and those with natural teeth in tooth tapping rate or in the occurrence, latency or duration of the jaw jerk reflex. A silent period during tooth tapping was found in 12 of the 13 women with implant bridges. The latency of the silent period was the same as in the subjects with natural teeth but the duration tended to be somewhat longer. The jaw jerk and the silent period were the same in individuals with implants in both jaws as in the whole implant group. It is therefore concluded that periodontal or mucous membrane receptors cannot be solely responsible for the silent p

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00695.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The experiment was performed in order to study the effect of acupuncture on headache by comparing the number of attacks during a 2‐month period after acupuncture with the number of attacks during a similar period before treatment. Twenty‐nine students (age: 19–24 years) all suffering from headache filled out questionnaires noting the days with attacks of headache and the amount and type of drugs used for 60 consecutive days. After acupuncture this observation procedure was repeated. One group of 10 students, however, received a placebo treatment instead of acupuncture but followed the identical questionnaire procedure. After 120 days acupuncture was given to this second group without revealing that the first treatment was a placebo. This treatment was again followed by a 60‐day observation period. Comparison of the questionnaires before and after acupuncture showed a significant reduction in the number of days with headache. The placebo treatment resulted in a nonsignificant reduction in attacks of headache. A reduction in the amount of drugs used, especially the acetylsalicylate type, was noted following the acupuncture treatment. It is concluded that acupuncture is a relevant therapy for headache with a definite symptomat

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00696.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Femurs and tibias of normal rats were fixed in 4% unbuffered solutions of glutaraldehyde or formaldehyde containing 1%NaF. Following washing, radiographically controlled demineralization was performed in 3.25% HNO3. Light microscopy and transmission electron microscopy revealed the presence of so‐called fluoride granules in bone trabeculae, cartilage, cartilage remnants, bone cells, chondrocytes and in the bone marrow. Selected area diffraction indicated that the fluoride granules contained CaF2. X‐ray diffraction analysis of non‐demineralized NaF‐fixed bones were negative for CaF2. The results are discussed and related to precipitation artifacts reported in demineralized hard tissues and to similar CaF2‐containing granules observed in demineralized bones and incisors of rats given high doses of NaF in diet or dri

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00697.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The purpose of this study was to evaluate the microleakage around preventive composite fillings in teeth subjected to mechanical loading and thermal cycling, and to assess the influence of the consistency of the composite resin upon the leakage. The fissure enamel was partially removed without dentin exposure in 30 extracted maxillary premolars. The cavities were etched with phosphoric acid and filled with undiluted composite (Adaptic®) or composite diluted with varying amounts of liquid resin (Adaptic Bonding Agent®). Five teeth were not acid etched and served as a control group. All teeth were mechanically loaded and unloaded, simulating masticatory forces, and subsequently thermally cycled between two dye solutions. Extensive leakage was seen around all fillings in the control group, while slight leakage, restricted to the feather‐edge margin, was seen in five teeth with acid etched cavities. Three of these contained undiluted composite fillings. Twenty teeth showed no leakage. The results show that preventive composite filling provides good sealing of occlusal fissures, and that the seal is resistant to those thermal and mechanical stresses which may be expectedin vivo. The use of diluted composite resin in preventive composite fillings is recomm

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00698.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –The affinity of hydroxyapatite for furfural and a brown pigment formed by furfural and glycine was studied. A series of mixtures containing 1 M furfural and 0.25–2.0 M glycine were incubated at 37°C and aliquots of hydroxyapatite added. The apatite showed a strong affinity for the brown pigment formed, and an excess of glycine in the mixtures appeared to enhance the binding. The adsorption of furfural to hydroxyapatite was estimated by a spectrophotometric method. The data revealed that pretreatrnent with CaCl2and glycine significantly increased the adsorption of furf

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00699.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Abstract –Eight powders and two liquids of zinc phosphate cements have been analyzed by optical emission spectrography for the purpose of characterizing elements in minor or trace quantities. The following elements were measured: bismuth, boron, cadmium, chromium, copper, iron, lead, silver and titanium. The content of any of these elements did not exceed the level of 0.1%. The amounts of such elements which might be transferred to the gastrointestinal tract associated with dissolution from unsuccessful restorations have been considere

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1979.tb00700.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY