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OBJECTIVES: The aim of this study was to create an evidence-based three-dimensional cephalometric analysis of orbits in order to perform time-efficient measurements of postoperative orbital morphology changes. MATERIALS AND METHODS: The authors used 23 (11 bilateral and 1 unilateral) anatomical landmarks. Based on these, 6 planes, 12 angular and 16 linear measurements were determined. A three dimensional analysis was performed twice by two observers on pre and post-operative computed tomography scans of six patients who had undergone midface advancement. The mean, minimal and maximal difference, as well as standard deviation (SD) and intraclass correlation coefficient (ICC) for the inter- and intra-observer landmark selection reliability were calculated. Additionally, the mean, minimal, maximal difference and standard deviation between pre- and post-operative angular and linear measurements were calculated to examine a connection between the established measurements and any morphological change. RESULTS: The inter and intra-examiner accuracy of all landmarks for three axes was >0.9 ICC. Despite excellent inter and intra-examiner agreement (<2.49 mm ± 2.05 mm SD) for the landmark selection, linear and angular measurements showed a mismatch, the mean SD for angular measurements was found to be 8.2° and the linear 3.04 mm. DISCUSSION: The possible causes of linear and angular measurement discrepancies are discussed and the future direction for the development of three-dimensional cephalometric analysis of orbits proposed.
RESUMEN
BACKGROUND: The use of vasoconstrictor agents has many advantages, but its use has been limited due to a fear of systemic absorption and the induction of adverse effects in cardiac compromised patients. The aim of this study was to review the literature to assess any scientific basis for the limited use of dental anaesthesia with a vasoconstrictor agent in cardiovascular compromised patients. MATERIAL/METHODS: A comprehensive database search was executed with the use of Medline (PubMed), ISI Web of Science, and Cochrane. The inclusion criteria were: a clearly defined dose of vasoconstrictor agent and the testing of at least 1 parameter (pressure, heart rate, or saturation) or occurrence of at least 1 cardiac incident (complication). RESULTS: Among all complications, only 10 could be directly related to the use of local anaesthesia. It is noteworthy that 40% appeared after the administration of anaesthesia without vasoconstrictor agents. No severe adverse clinical effects were noted in the analysed studies. CONCLUSIONS: The most frequent complications in cardiovascular compromised patients after dental local anaesthesia with a vasoconstrictor agent were disclosed in ECG arrhythmias. Most of these disclosed arrhythmias were clinically insignificant. The use of ≤ 4 ampules of lignocaine with epinephrine 1:100000 as a dental anaesthetic seems to be relatively safe for cardiovascular compromised patients.