摘要:

This report reviewsbite plate therapy and describes several variations of bite plates. Bite plates may be useful as an adjunct to periodontic and orthodontic therapy. They may be used as a diagnostic appliance, to take mobile teeth out of trauma by disarticulating them, to allow teeth to extrude and shallow out associated osseous deformities, and to eliminate the superimposed occlusal trauma that may be caused by the parafunctional habits that can develop during orthodontic tooth movement. The change in vertical position of the dentition and the decrease in overbite are primarily due to eruption of the posterior teeth and not intrusion of the lower anterior teeth. The decrease in overbite may be accompanied by an increase in overjet and an alteration of the mesio‐distal and bucco‐lingual occlusal landmarks. In some cases the use of a bite plate may cause the development of an anterior open bite. Any such occlusal alterations produced by the bite plate should be corrected by occlusal adjustment or orthodontic therapy and occlusal adjustment.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.123

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Acomparative ultrastructuralstudy was carried out on several species ofActinomycesand related Gram‐positive rods includingArachnia, Bacterionema, RothiaandLeptotrichia. A total of 52 well characterized strains were examined by transmission electron microscopy. Particular attention was paid to the ultrastructure of the cell periphery, that is the plasma membrane, periplasmic space, the cell wall per se and extramural structures, including surface “fuzz”. In addition, the ultrastructure of various features of the cytoplasm were also examined. A good correlation appeared to exist between certain ultrastructural characteristics of the microorganisms and their taxonomic position as determined by other criteria. It should be noted, however, that the ultrastructure of certain strains differed markedly from that of the remaining strains of the species. This observation raises some doubt on the appropriateness of the current classification for these particular strains. The ultrastructural features of the cell periphery were found to be particularly stable for all strains grown under standard conditions. For this reason, ultrastructural features of the cell wall and associated structures are probably a more reliable source of morphological criteria for identification purposes than the ultrastructural characteristics of the cytoplasmic components which tend to be more variable. The results suggest that certain ultrastructural features are useful criteria for the identification and classification of these Gram‐positive rods.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.136

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

The effect ofan almost complete elimination of bacterial plaque upon the sulcular tissues was studied in Rhesus monkeys. They received thorough scaling and polishing and daily antibacterial therapy for 40 days. Biopsies including the gingival sulcus area were taken periodically during experimentation. They were also taken up to 74 days after therapy was discontinued. Biopsies were evaluated histologically for inflammation and keratinization. Half of each biopsy was exposedin vitroto tritiated thymidine to determine mitotic activity of the sulcular and junctional epithelium. The Inflammatory Index decreased from 28.3 in the junctional epithelium (Zone A) and 30.3 in the sulcular epithelium (Zone B) to approximately 3 to 4 in both zones after 40 days of therapy. The Radioactive Index decreased from 24.7 in Zone A and 29.7 in Zone B initially to approximately 2.0 in Zone A and to less than 1.0 in Zone B at Day 40. Both Radioactive Index and Inflammatory Index approached pretreatment levels 74 days after cessation of antibacterial procedures. The most striking feature histologically was a progressive keratinization, demonstrated by specific stains, of the sulcular epithelium. This change was coincident with the decreases in bacteria, inflammation, and mitotic activity. This study achieved an alteration in the sulcular environment by producing a decrease in the number of bacteria, inflammation, and mitotic activity. Keratinization of the gingival sulcus became evident as the sulcular environment changed. It seems reasonable to postulate that reduction in the subgingival bacterial flora reduces inflammation, reduces mitotic activity and allows full differentiation of the sulcular epithelium.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.155

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

The report is a reviewof the literature related to hepatitis B and its implications for dental practitioners. Hepatitis B represents a serious health risk among dentists and simple preventive measures can greatly reduce the risk of transmission or contraction of the disease. Certain positive findings in a health history should alert the dentist that he may be treating a carrier of hepatitis B. If so, the wearing of gloves, a mask and protective eyewear will almost totally protect one from contracting the disease. To guard against transmission of hepatitis B to other patients in the dental practice, all instruments should be sterilized and all environmental surfaces should be appropriately treated. A person with a confirmed exposure to hepatitis B should be inoculated with immune serum globulin.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.162

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

Twenty‐six localizedgingival recessions treated with either a lateral sliding flap or a coronally repositioned flap procedure more than 3 years ago were reevaluated. Biometric measurements on the recipient and the donor or control teeth included: a) cementoenamel junction, gingival margin; b) sulcus depth; c) gingival margin, mucogingival line. These recordings were statistically compared to those taken 180 days after the surgical procedures were performed. Pairwisettests were used to determine whether there were any changes between the 180 days and the 3 years postoperative control with either procedure. A two samplettest was run to see whether the changes obtained with the two procedures differed from each other. No significant changes were found. The values for gingival recession, sulcus depth and width of keratinized gingiva remained stable for both techniques throughout the observation period.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.167

出版商:Wiley    

年代:1980

数据来源: WILEY

摘要:

It has been shownthat “functionally” oriented collagen fibers will attach to cementum when a healthy root fragment is implanted subcutaneously in the rat along with decalcified autogenous bone. The purpose of the present study was to show how prior root decalcification affected this inductive action. Twenty‐six pairs of bone and root were implanted in 13 200‐gm, female, white, Sherman strain rats. The postoperative periods ranged from 1 week to 12 months. The results showed that root decalcification prevented formation of the “functionally” oriented fibers and inhibited bone induction by the decalcified autogenous bone. It was suggested that all roots have an inhibitor, the least amount in periodontally healthy roots and the most in periodontally diseased roots. It was also suggested that the clinical successes in reattachment reported with acid treatment of roots were due to the denaturant effects rather than surface decalcification.

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.171

出版商:Wiley    

年代:1980

数据来源: WILEY

ISSN:1049-8885    

DOI:10.1902/jop.1980.51.3.175

出版商:Wiley    

年代:1980

数据来源: WILEY