A quality-made dental impression is a prerequisite for successful fixed-prosthodontic fabrication and is directly dependent on the dimensional stability, accuracy and flexibility of the elastomeric impression materials, as well as on the appropriately used impression techniques. The purpose of this paper is to provide a literature review of relevant scientific papers which discuss the use of various silicone impression materials, different impression techniques and to evaluate their impact on the dimensional stability and accuracy of the obtained impressions. Scientific papers and studies were selected according to the materials used, the sample size, impression technique, storage time, type of measurements and use of spacer for the period between 2002 and 2016. In the reviewed literature several factors that influence the dimensional stability and accuracy of silicone impression molds, including the choice of the type of viscosity, impression material thickness, impression technique, retention of the impression material on the tray, storage time before the casting, number of castings, hydrophilicity of the material, release of byproducts, contraction after polymerization, thermal contraction and incomplete elastic recovery were presented. The literature review confirmed the lack of standardization of methodologies applied in the research and their great diversity. All findings point to the superiority of the addition silicone compared to the condensation silicone.

Introduction: Cephalea from orofacial origin is a diffuse, mild to moderate pain that appears as a bandage around the head. There are many different etiological causes of dental origin that contribute to the appearance of cephalea. Purpose: The purpose of our research is dental treatment of patients with traumatic occlusion, bruxism and loss of occlusal support, which have a pathological condition - cephalea from orofacial origin. Material and methods:For the purposes of this paper, 15 patients with cephalea from orofacial origin were analysed, diagnosed and treated. The control group consisted of 15 patients without etiological factors. A butterfly deprogrammer and a stabilization splint were made depending on the indication. Results and discussion: According to our patient study results, it appears to be a link between inadequately made prosthetic devices, bruxism and loss of occlusal support with cephalea. The therapy should help the patient urgently and continue to relieve the cephalea symptoms from orofacial origin. The results show an improvement in 86.7% of the examinees. Conclusion: The butterfly deprogrammer and stabilization splint are new methods that can contribute along with other therapeutic modalities in improving the quality of life in a patient with cephalea from orofacial origin.

Aim: To examine the role of IgA, CIC and component C3 as indicators of humoral immune response in the etiopathogenesis of oral erosive lichen planus (OELP). Material and method:The study comprised 19 patients with OELP whose samples of blood, saliva and tissue were obtained after carefully taken medical history and clinical examination. Samples of oral mucosa were taken from the site of lesion, i.e. exclusively from buccal mucosa (1 cm in width and length), and from the deep epithelium as well as a segment from the lamina propria. Determination of immunoglobulins in serum and saliva, and determination of component C3, was done using the micro-elisa technique by Rook&Cameron, Engvall and Ulman. Determination of CIC in serum and mixed saliva was done with the PEG (polyethylene glycol) method. Determination of immunoglobulin A and component C3 in biopsy material was done with direct immunofluorescence. Results: Levels of immunoglobulin A in serum in OELP during exacerbation were decreased (1.04 ± 0.49 gr/l) and during remission increased (5.92 ± 0.62) in comparison with the control group (p < 0.001). Levels of CIC during exacerbation and remission were increased (p < 0.001), and component C3 levels were increased in both examined phases in the examined group compared with the control group (p < 0.05). Deposits of IgA were registered in one (5.88%) patient with OELP and component C3 was registered in 3 (17.64%) patients. Conclusion: Changes in IgA values, as well as CIC and component C3, may correlate with changes in oral mucosa emphasizing the role of humoral immune response in the pathogenesis of oral lichen planus.