Determining the localization of premolar zenith positions according to the gingival line.

BACKGROUND: The gingival zenith (GZ) positions according to a reference line in the premolar (PM) area remain concern, especially for the clinicians in placing the gingival contours during surgery. OBJECTIVES: The objectives of this study are to determine the maxillary PM GZ positions according to GZ line (GZL). MATERIALS AND METHODS: A sample population of 63 patients with healthy gingival tissue was studied. The GZ was determined at the most apical point of the gingival marginal scallop. A horizontal-zenith line (ZL) was drawn connecting the GZ from the ipsilateral canine (C) and central incisor teeth. Reference lines were drawn, and bilateral measurements were taken in the respective stone casts in the PM area. RESULTS: No statistically significant differences were found between bilateral first premolars (FPM) and second premolars (SPM). When considering ipsilateral FPM and SPM, statistically significant differences were found between them. For all PM teeth, the mean distance value of GZ to GZL was approximately 1.32 mm. CONCLUSIONS: The present study results showed that GZs of FPM and SPM teeth for both left and right sight was coronally located according to ZL.

Changing the bonding force of impression tray to edentulous maxillary jaw simulator with impression valve system: in vitro study.

OBJECTIVE: The aim of this study was to evaluate the effect of an impression valve system (IVS) on the bonding force between an impression tray and an edentulous maxillary jaw. MATERIALS AND METHODS: In this in vitro study, a polyether-coated maxillary jaw simulator (PM) was used to model an edentulous maxillary jaw. The IVS was placed into individual impression trays. An irreversible hydrocolloid impression was taken of the PM when the IVS was open and closed. The impression tray bonding force was measured using a digital dynamometer. Student's t-test was used to determine the significance of the difference between these two groups. RESULTS: The impression tray was more easily separated from the PM when the IVS was open (108 ± 3.9 N). The separation was more difficult when the IVS was closed (153.7 ± 14.2 N). The difference between these two findings (P = 0.000) was significant. CONCLUSION: The use of an IVS facilitates the removal of the impression tray from the mouth when taking impressions from an edentulous maxillary jaw.

Rare gallbladder parasitosis mimicking cholelithiasis: Dicrocoelium dendriticum.

Cholelithiasis is increasingly diagnosed in childhood and infancy. Biliary parasites are the rarest cause of cholelithiasis in all age groups. We present a twelve-year-old girl with non-hemolytic gallbladder stone and discuss the clinical features and differential diagnosis of Dicrocoelium dendriticum (DD) invasion that causes and/or mimics cholelithiasis in children.

The current situation of bluetongue in Turkey.

The first reported outbreak of bluetongue (BT) was in 1977 in the Aydin Province in the west of the country. Disease spread between 1977 and 1979 and became endemic in the provinces bordering the Aegean and Mediterranean Seas. The causative agent was isolated in samples from sheep and calves and was identified as bluetongue virus (BTV) serotype 4. Epidemiological investigations showed that not only sheep, but also goats and cattle, were involved in these outbreaks. The vector was Culicoides imicola. The disease was controlled successfully by vigorous control measures (quarantining, animal movement control, disinfection, insecticide treatment and vaccination campaigns) in sheep in the western provinces. Attenuated BTV-4 vaccine, produced in the Etlik Central Veterinary Control and Research Institute, was used in the vaccination campaigns. Unexpected BT outbreaks occurred in the Edirne Province, north-west of Thrace, on 20 July 1999 and spread to adjacent villages. The disease was controlled successfully by the measures described above. The last case was recorded in August 2000. Serotypes were reported as BTV-9 and BTV-16 by the Institute for Animal Health (IAH) in Pirbright. Diagnosis was based on clinical findings, serological surveillance and virus isolation.