Conservative periodontal treatment combined with orthodontics for "hopeless" anterior teeth. A case report

This article describes the treatment of a patient with periodontally "hopeless" teeth by conservative periodontal therapy combined with subgingival chlorhexidine irrigation and orthodontic tooth movement. The 3-year follow-up post-treatment shows the relative success of the treatment, without the use of surgical modality or the extraction of any teeth.     

Evidence for reactive nitrogen species formation in the gingivomucosal tissue

An increase in nitric oxide production has been demonstrated in periodontitis. Here we investigated the potential role of nitric-oxide-derived nitrating species (such as peroxynitrite) in a rat model of ligature-induced periodontitis. Formation of 3-nitrotyrosine, the stable product formed from tyrosine reacting with nitric-oxide-derived nitrating species, was detected in the gingivomucosal tissue. 3-Nitrotyrosine immunohistochemical analysis revealed a significant elevation in the number of immunopositive leukocytes, and higher immunoreactivity of the gingival ligaments and epithelium in the ligated than in the contralateral (control) side. On both sides, several 3-nitrotyrosine-positive bands and, on the ligated side, a unique 52-kDa 3-nitrotyrosine-positive band were detected by Western blot. However, in the sterile gingivomucosal tissue of rat pups, no 3-nitrotyrosine or inducible nitric oxide synthase immunoreactivity was found. Analysis of these data suggests that resident bacteria of the gingivomucosal tissue induce an increase in reactive nitrogen species, which is greatly enhanced by plaque formation in periodontitis.     

Quantitatively study of voice onset time-Glottal stop]

To quantitatively evaluate the acoustic characteristics of glottal stop, pronunciation of/ka/in 10 normal subjects and 14 patients with cleft palates were analyzed by sound spectrography and 20 msec in all normal articulation of /ka/ with an average time of 44.6 msec.In the test group of /ka/ demonstrated an average time of 20.8 msec.The inverse correlation ship between VOT and the psyco-acoustical judgment for the degree of distortion was demonstrated to be significant.     

The value of the different radiological examining methods in caries diagnosis]

This in vitro study compared the results of clinical examination (abbreviation CE) and the three radiological methods (i.e RVG-radiovisiography) on occlusal and proximal caries diagnosis,using pathological observation as the final standard.The results are:on occlusal caries diagnosis,CE provide the most accordant result to the pathological result.There are statistically significant differences between SR and CE,BW and CE.1st suggests that to occlusal caries diagnosis,CE is still a convenient and efficient way.On proximal caries diagnosis,there are statistically significant differences between SR and CE,BW and CE.BW has the most coincident result with pathological one.     

Prevalence of dental caries and quality of restorations among new immigrants to Israel

The purpose of the present investigation was to gather information on the prevalence of dental caries and the quality of restorations of new immigrants to Israel, and to compare those two categories among immigrants from different regions of origin. New immigrants, residents of four absorption centers in Israel, were included in the study. Altogether, 1,031 immigrants (417 Eastern European, 338 Western European/North American and 276 South American) were examined. The results indicate that new immigrants to Israel from Eastern Europe are affected with more carious teeth (D), are missing more teeth (M), and have received quantitatively less treatment (F) than immigrants from Western Europe/North American and South America. The South America are an intermediate group. A similar distribution was found between the groups by their respective ages. The quality of dental restoration was found to be statistically higher among immigrants from Western European/North American and South American origins with the latter group exhibiting an intermediate level of quality of dental restorations.     

Analysis of lateral tooth movement during forced orthodontic eruption

STATEMENT OF PROBLEM: Forced eruption is a prosthodontic procedure that enables the treatment of otherwise problematic restorative conditions. During the vertical orthodontic movement, the root may be moved laterally, affecting the position of a tooth in the arch. PURPOSE: This study quantified the degree of lateral movement possible during the eruptive procedure and addressed the significance of this movement from a theoretical and clinical standpoint. MATERIAL AND METHODS: A patient treatment, which demonstrated the movement in a single direction on the buccolingual axis, was isolated. On the basis of this theoretical model, a clinically relevant model was developed: A "worst-case" situation for each posterior tooth was calculated, from which clinical conclusions may be derived. RESULTS:. In a given extrusion angle of 30 degrees, a lateral movement/shift of 0.58 mm resulted per 1 mm of eruption distance. The lateral movement for every millimeter of eruption and the maximum extrusion angle for each of the maxillary and mandibular posterior teeth were calculated. CONCLUSION: The lateral movement that accompanies the forced eruption procedure may compromise or be used to esthetically enhance prosthodontic treatment.     

Electron microscopy of horseradish peroxidase uptake by papillary cells of the mouse incisor enamel organ

Horseradish peroxidase was injected into the tail veins of adult mice. Enamel organs were excised from mice killed at predetermined intervals, fixed in formaldehyde-glutaraldehyde, incubated in diaminobenzidine medium, post-fixed in OsO₄, and processed for electron microscopy. Within 5 min of peroxidase administration, the reaction product was seen extracellularly between papillary cells and between reduced ameloblasts, but not beyond the apical terminal bar apparatus. Only papillary cells took up the peroxidase intracellularly via bristle-coated vesicles. Within the papillary cells, peroxidase was also seen in tubular structures, and at 30–60 min intervals in numerous multivesicular bodies.The results demonstrate that (1) the basal terminal bar apparatus of reduced ameloblasts is permeable to peroxidase, whereas the apical is not, (2) papillary cells function in the absorption of protein from the capillaries, and (3) bristle-coated vesicles and tubular structures serve to transport absorbed protein to multivesicular bodies within papillary cells.     

固齿健周煎剂对老年小鼠的抗氧化作用

目的探讨中药固齿健周煎剂对老年小鼠的抗氧化作用。方法实验组为固齿健周煎剂灌胃的老年小鼠，对照组为灌胃等量自来水的青、老年小鼠。检测过氧化脂质、超氧化物歧化酶及过氧化氢酶。结果实验组与青、老年小鼠对照组比较差异均有显著性。结论固齿健周煎剂具有抗脂质过氧化的作用，可能对调节机体代谢功能、抗自由基损伤及恢复牙周组织健康有益