摘要:

Bevenius J, Lindskog S, Hultenby K. The micromorphology in vivo of the buccocervical region of premolar teeth in young adults. A replica study by scanning electron microscopy. Acta Odontol Scand 1994;52:323–334. Oslo. ISSN 0001-6357.The buccal surfaces of premolar teeth are common sites of gingival recession, generally attributed to overzealous oral hygiene. Scanning electron microscopy (SEM) of replicas made from dental impressions was applied to document the micromorphology of the buccocervical region of all premolar teeth in 27 dentally healthy, young adults. The SEM observations were correlated with clinical examination. Of the 216 sites, one-third, predominantly the maxillary first premolars, had gingival recession, but fewer than 50% were clinically discernible. The exposed roots were devoid of cementum, and the dentinal surface was smear-like or dotted with tubular apertures from which droplets of fluid extruded. SEM of replicas of gingiva, recorded as clinically healthy, frequently showed signs of inflammation: fluid exudate and distortion of gingival contour by swelling. The cervical enamel of healthy and affected sites showed characteristic periodic fissure-like cracks, probably enamel tufts. The high frequency of subclinical gingival recession, exposed cervical dentin, and gingival inflammation in dentally healthy young adults, in the absence of abrasion of hard or soft tissues, indicates the need to review conventional concepts of initiation of buccal recession and root exposure.

ISSN:0001-6357    

DOI:10.3109/00016359409029030

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

Østergaard E. Evaluation of the antimicrobial effects of sodium benzoate and dichlorobenzyl alcohol against dental plaque microorganisms. An in vitro study. Acta Odontol Scand 1994;52:335–345. Oslo. ISSN 0001-6357.Evaluation of antimicrobial agents is based on in vivo and in vitro studies. The minimum inhibitory concentrations (MICs) of sodium benzoate and dichlorobenzyl alcohol to 115 strains of plaque microorganisms were determined by a broth-dilution method. Sodium benzoate did not inhibit growth of any gram-positive cocci (MIC>106,590µM). MICs forPorphyromonas gingivalisand two strains ofTreponema socranskiiwere 26,650µM. The MIC of dichlorobenzyl alcohol to the reference strain ofActinobacillus actinomycetemcomitanswas 723µM and toP. gingivalis, two strains ofT. socranskii, andCandida albicans1,446µM. MICs for other organisms were 2,892 to 5,784µM. Saliva samples from 10 volunteers, collected at various times after toothbrushing with a dentifrice containing 10% sodium benzoate and 0.3% dichlorobenzyl alcohol, were analyzed gas-chromatographically. Immediately after toothbrushing mean levels of sodium benzoate and dichlorobenzyl alcohol were 372,626µM and 7,529µM, respectively. After 5 min mean levels were 38,700µM and 734µM. In conclusion, the concentrations of both antimicrobials dropped rapidly during the first 30 min, but for 5–10 min they were high enough to inhibit growth of potential periodontal pathogens.

ISSN:0001-6357    

DOI:10.3109/00016359409029031

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

Kirstila V, Lenander-Lumikari M, Tenovuo J. Effects of a lactoperoxidase-system-containing toothpaste on dental plaque and whole saliva in vivo. Acta Odontol Scand 1994;52:346–353. Oslo. ISSN 0001-6357.The effects of a lactoperoxidase-system-containing toothpaste, Biotene, on saliva and dental plaque were studied. In a double-blind crossover study 20 healthy volunteers used an experimental (comprising the complete peroxidase system) or a placebo (without lactoperoxidase. KSCN, and glucose oxidase) toothpaste twice daily for 2 weeks separated by a 2-week washout period. At base lines and at the end of both test periods saliva and plaque samples were collected, and plaque pH changes were monitored. Saliva was analyzed for hypothiocyanite (HOSCN/OSCN-) and thiocyanate (SCN-) concentrations and salivary peroxidase activity. The amount of total streptococci, mutans streptococci, lactobacilli, and total anaerobic flora was determined both in saliva and in plaque samples. The accumulation and the acidogenicity of plaque were also quantitated. A 2-week daily use of Biotene had no effect on salivary flow rate, peroxidase activity, HOSCN/OSCN-, SCN-, or any of the monitored bacterial counts compared with the placebo toothpaste. The accumulation of dental plaque was not affected by the lactoperoxidase-system-containing toothpaste. The acidogenicity of plaque did not change significantly, not did the two test dentifrices differ in their ability to inhibit the plaque pH drop caused by sucrose in subjects with normal salivary flow rate.

ISSN:0001-6357    

DOI:10.3109/00016359409029032

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

Olsen I. Chemotaxonomy of bacteroides: a review. Acta Odontol Scand 1994;52:354-367. Oslo. ISSN 0001-6357.The loose definition ofBacteroides, some species of which are important etiologic agents of oral diseases, has enabled isolates with only marginal similarities to be reposited in this genus. Many attempts have been made over the years to improve the taxonomy of this heterogeneous group of bacteria. The present article reviews major chemotaxonomic characters and techniques that have been used for this purpose: pigmentation, metabolites, whole-cell fatty acids, phospholipids, isoprenoid quinones, carbohydrates of lipopolysaccharide, whole-cell proteins, peptidoglycans, enzymes, pyrolysis mass spectrometry, DNA composition, restriction fragment length polymorphisms of DNA and ribosomal (r) RNA, homology of DNA and NNA, DNA-rRNA hybridization, and 16s and 5s rRNA oligonucleotide cataloging and sequencing. Despite improvements in their taxonomy, some bacteroides are still misclassified. Suggestions for further improvements in the taxonomy of bacteroides are made.

ISSN:0001-6357    

DOI:10.3109/00016359409029033

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

van Dijken JWV. A 6-year evaluation of a direct composite resin inlay/onlay system and g. iass ionomer cement-composite resin sandwich restorations. Acta Odontol Scand 1994;52:368-376. Oslo. ISSN 0001-6357The most undesirable characteristic of composite resin is its polymerization shrinkage. Two techniques developed to counter this problem are the Composite inlay and the sandwich composite filling. The durability of 100 direct composite inlays and 34 closed and 16 open sandwich composite fillings made with a conventional glass ionomer cement were evaluated during a 6-year period in a group of low and high caries risk patients. Modified USPHS criteria were used. Six inlays (6%), 5 closed sandwich fillings (14.7%), and 12 open sandwich fillings (75%) needed replacement. Six other inlays and three closed sandwich fillings showed non-acceptable defects that could be repaired with composite resin. The direct composite inlays showed very good clinical durability, whereas the open sandwich filling with conventional glass ionomer cement as dentin replacement cannot be advocated as a class-II restoration.

ISSN:0001-6357    

DOI:10.3109/00016359409029034

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor

摘要:

Angulo M, Pivel L, Zinemanas E, Jorysz E, Krasse B. Dental caries and microbial and salivary conditions in Uruguayan children from two different socioeconomic areas. Acta Odontol Scand 1994;52:377–383. Oslo. ISSN 0001-6357.Dental canes, microbial and salivary conditions, dietary habits, and socioeconomic conditions were studied in 100 12–to 13-year-old children from 2 different socioeconomic areas in Montevideo: Pocitos and Piedras Blancas. The residents of Pocitos had a higher educational level, better housing conditions, and occupations involving higher earnings than those of Piedras Blancas. The caries prevalence in the two areas was about the same, but the children in Piedras Blancas had more decayed surfaces and fewer filled surfaces than the children in Pocitos. The mean values for caries in Piedras Blancas and Pocitos were, DMFT, 4.2 and 4.2; DMFS, 8.1 and 7.8; DS, 4.7 and 2.5; and FS, 1.7 and 4.7, respectively. The differences in DS and FS were statistically significant. The frequency of sugar intake and the salivary secretion rate were similar, but the buffer capacity was significantly higher in Pocitos than in Piedras Blancas. The plaque index was the same, but the distribution of cariogenic microorganisms differed significantly. Fifty-eight per cent of the children in Piedras Blancas had more than 106CFU of mutans streptococci per milliliter saliva, compared with 17% of the children in Pocitos. Similar differences were found with regard to the lactobacilli. The percentage of children with high numbers of mutans streptococci was higher in Piedras Blancas and lower in Pocitos than in previous epidemiologic studies in Scandinavia. It was, however, higher than that recently noted in Finland.

ISSN:0001-6357    

DOI:10.3109/00016359409029035

出版商:Taylor&Francis    

年代:1994

数据来源: Taylor