ABSTRACT
The use of expanded polytetrafluoroethylene (ePTFE) membranes in the treatment of mucogingival problems such as gingival recession, has been recently described. The major issues raised dealt with creating and maintaining space under the membrane and designing a flap that could be coronally positioned and at the same time capable of maintaining a good blood supply. The authors proposed the use of a trapezoidal flap and some technical space-making solutions, such as the use of a suturing technique and different metal structures to support the membranes.
Subject(s)
Gingival Recession/surgery , Guided Tissue Regeneration, Periodontal , Suture Techniques , Adult , Female , Follow-Up Studies , Gold , Humans , Male , Middle Aged , Surgical FlapsABSTRACT
With multiple measurements on Dicor crowns cast on extracted teeth and observed under SEM, we determined that the thickness of the external layer of shading porcelain has a mean value of 55 +/- 12 microns (for 4 applications). This datum must be considered so that a dimensional error is not introduced in the construction of these types of crowns.
Subject(s)
Ceramics , Crowns , Dental Porcelain , Color , Humans , Materials Testing , Microscopy, Electron, Scanning , Surface PropertiesABSTRACT
Gastrointestinal hormones containing the C-terminal tetrapeptide of gastrin are involved in calcium homeostasis. The aim of this study was to investigate: 1) the effect of a standard meal (schedule a) and of a duodenal infusion of 5% aminoacid solution (schedule b) on calcium, CT and PTH serum levels in man; 2) the behaviour of these parameters during I.V. infusions of pentagastrin (mcg 1.5/Kg-hour), sincalide (mcg 0.04/Kg-hour) and caerulein (ng 75/Kg-hour) (schedule c). In order to avoid any possible interference by endogenous secretin release, schedule c was performed in 5 patients previously submitted to total gastrectomy. Schedule a and b were studied in 5 healthy volunteers. After a standard meal a slight increase of CT and PTH was measured. Duodenal infusion of aminoacid was followed by hypocalcaemia and slight but constant rise of CT levels, without significant variations of circulating PTH. Pentagastrin, sincalide and caerulein induced a slight but significant hypocalcaemia and a rise of serum CT levels, together with a significant increase of serum PTH. These findings suggest that peptides containing the C-terminal tetrapeptide of gastrin directly affect calcium homeostasis in the absence of secretin release.
