摘要:

Abstract –Human coronal dentin was studied by light microscopy and microradiography. The material comprised 50 permanent and 10 primary anterior teeth and microradiographs of 63 primary anterior teeth from a previous study. Both intact and worn teeth were examined. Ground sections in the long axes of the crowns in the buccolingual and mesiodistal planes were prepared, as well as transverse sections. A few crowns were also examined in toto. A system of giant tubules extending from the border of the pulpal cavity could be followed, though not continuously, through the secondary and primary dentin almost to the incisal dentinoenamel junction was observed. The lumina of the tubules were 5–40 μm wide and bordered by an approximately 10‐μm‐wide, usually hypermineralized rim of dentin in which only a few dentinal tubules were clearly discernible. The giant tubules were located along the mesiodistal axes of the teeth. The number of such tubules varied between

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00768.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Abstract ‐Whole body retention and tissue distribution of58Co in mice having had an oral cavity depot of58CoCl2was studied at 1, 5 and 24 h after administration by means of gamma scintillation measurements and autoradiography. The whole body58Co retention at 5 h after administration was 93.3% of the whole body58Co content at 1 h. Corresponding58Co‐retention at 24 h after administration was 9.2%. Tissues analyzed by gamma scintillation measurements at 1, 5 and 24 h post administration were: serum, kidney, pancreas, spleen, liver, heart, lung, tongue and palatal mucosa. At all survival times after administration palatal mucosa showed the highest58Co median content followed by tongue. The very high58Co median content of palatal mucosa and tongue at l h after administration showed a strongly decrease at 5 and 24 h alter administration. For the other tissues the highest58Co median content was found in the liver and the lowest in the spleen with the highest58Co median value for each tissue at 5 h after administration. The autoradiograms revealed a high58Co uptake in oral, nasal, pharyngeal and esophageal mucosa, intestines and stomach. In liver, pancreas and kidney no uptake was observed at l h and a weak uptake was detected at 5 and

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00769.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Transferring actively growing bacteria or Streptococcus mutans ATCC 27351 into a xylitol‐containing reaction mixture caused distinct alterations in bacterial ultrastructure without notable effect on the total viability of the strain. Incubations in media containing 50 mg/ml of glucose, fructose, sucrose, lactose, sorbitol or mannitol as the primary carbon source did not affect bacterial ultrastructure. These fermentations were reflected biochemically in the amounts of insoluble glucans, as expected. A negative correlation was found between the cell mass and the lipoteichoic acid formation. But these aspects could not be visualized in the electron microscope. In the xylitol series, however, degrading cells and autolysis, intracellular vacuoles and lamellated formations in the cytoplasmic membrane were frequently seen independent of the concentration of xylitol in the reaction mixtures. In freeze‐fracturing replicas, however, the membrane intercalated particles of the cytoplasmic membranes seemed to be unaffected and like those in the controls. Minor ultrastructural changes in the fracture‐faces were detected. Despite the alterations in ultrastructure of the xylitol‐incubated bacteria, there was no difference in their viability when compared to the

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00770.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Plaque and saliva samples were obtained twice from 58 children at an interval of 1 year and examined for the prevalence of Streptococcus mutans on Mitis salivarius (MS) and Mitis salivarius bacitracin (MSB) agar. Two types of S. mutans colonies with different colonial morphologies were seen on both media. They were serologically identified as serotypes c/e/f and d/g respectively. The first type, morphogroup c/e/f, had the typical “frosted‐glass” appearance. It was the most prevalent and was found in 97% of the children. The second type, morphogroup d/g, had a creamy marzipan consistency with a dull, granular surface, gray to brown in color and often with some liquid around or on top of the colony. Group d/g was detected in 21 children (36%) and then together with colonies of group c/e/f. Children infected with single or multiple morphogroups of S. mutans generally harbored the same groups 1 year later. There was a significant positive correlation between the proportion of S. mutans in plaque and their numbers in

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00771.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The aim of this study was to investigate the relationship between pain and tenderness to palpation of the temporomandibular joint (TMJ), radiographic changes of the joint and signs of inflammation in the synovial fluid. Saline was injected into and aspirated from the TMJ of 29 patients with painful and tender TM joints and from five individuals with healthy joints. In another two patients synovial fluid could be aspirated without saline. The aspirated fluid was analyzed for inflammatory cells and for plasma proteins. A clinical examination of the stomatognathic system and a radiographic examination of the TMJ were performed before the aspiration. Besides tenderness to palpation of the TMJ, pain on mandibular movement and tenderness to palpation of the masticatory muscles were common. Erosion of the cortical outline of the joint surfaces was the most common radiographic finding. Inflammatory cells were present in the fluid of three patients but in none of the healthy individuals. Plasma proteins of inflammatory type could be detected in the fluid from seven of the patients. The results show that radiographic, cellular or biochemical signs of inflammation can frequently be found in the TMJ of patients with longstanding pain and tenderness of this join

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00772.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Retention of Cu and Zn in the mouth after rinses with known volumes of aqueous solutions of the metal salts was measured by atomic absorption. The mean amounts retained in 10 subjects were 0.02 mg Cu and 0.22 mg Zn. These values represent approximately 31 % of the Cu and 15% of the Zn originally in the rinse. The intraindividual variation (s.d.), estimated by three mouthrinses at weekly intervals in three subjects averaged 2.1% for Cu and 2.3% for Zn. Following a rinse the salivary concentration of Cu and Zn decreased rapidly during the first 4 h, approaching premise level

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00773.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Effects of therapeutic and pulp protecting dental materials on nervous tissue were studied in an in vitro model utilizing the isolated left rat phrenic nerve. The nerve was placed in a buffer bath between two suction electrodes, one for electrical stimulation and one for recording. Evoked compound action potentials (cAP) were monitored in an oscilloscope. Fresh mixes of six commonly used pulp‐dentin materials were placed in contact with the nerve, and the cAP registered. Formocresol, zinc oxide‐eugenol (ZOE), Calasept® and Dycal® caused a complete depression of the nerve activity within 0.5 to 5 min of contact. The depression appeared irreversible with Formocresol and Calasept, reversible with Dycal, and reversible with ZOE when applied to nerves surrounded by adherent fatty tissue. De Trey Zinc® and Durelon® caused only a minor depression of the cAP within 30 min o

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00774.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The curing contraction of addition‐type silicone impression materials was measured by the mercury bath method. The results point to a classification of this group of materials into the following two types: 1: materials with maximum 0.08% polymerization contraction at 22°C 15 min after mixing and maximum 0.03% contraction at 22°C during storage from 15 min to 24 h (Permagum®, President®, Reflect® and Reprosil®). 2: materials with more than 0.08% polymerization contraction at 22°C 15 min after mixing and significantly more than 0.03% contraction during storage at 22°C from 15 min to 24 h (Exaflex®

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00775.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –Abstract– Eight different dental amalgams were studied in an in vitro corrosion test. Cylindrical test specimens were stored in weak lactic acid solutions at different pH for 1 month. The concentrations of mercury and copper in the solutions were measured and corrosion depths estimated. The results indicated that more copper was released from non ‐ γ2‐ amalgams compared with conventional ones. The amounts of copper from these amalgams were not directly correlated to the concentration in the alloys. Mercury was released in much lower amounts than copper for all amalgams and seemed to originate from the γ1‐phase. A low pH promoted th

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00776.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY

摘要:

Abstract –The present study has shown that there is no correlation between the free curing contraction of three selected addition‐type silicone impression materials and the effective contraction determined as the accuracy of stone dies produced in dental impressions of these materials. Depending on specific rheologic properties, the free curing contraction of an impression material can be partly compensated for by f

ISSN:0909-8836    

DOI:10.1111/j.1600-0722.1983.tb00777.x

出版商:Blackwell Publishing Ltd    

年代:1983

数据来源: WILEY