Scripta Scientifica Medicinae Dentalis

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Authors: Miglena Balcheva, Assya Krasteva, Angelina Kisselova, Georgi Nikolov

INTRODUCTION: Oral allergy syndrome (OAS) is a form of food allergy. It develops mostly in patients with pollinosis, but also could be a manifestation of the so-called latex-fruit syndrome. OAS is probably a result of immunological cross-reactions due to common allergens or their epitopes in pollens, latex and foods of plant origin. Our purpose was to determine the extent of sensibilization to pollens and plant-derived foods in cases of OAS through in vitro allergy tests. METHODS AND MATERIALS: We studied 60 patients with OAS after food intake. The survey included allergic history, examination and skin prick tests (SPT) with pollen and food allergens. Specific IgE to pollens and foods were determined through Euroline and ImmunoCAP system in the cases of highly expressed SPTs. RESULTS: Specific IgE were determined in 17 patients (male and female). Both tests demonstrated similar results. Most of the patients showed hypersensitivity to more than two allergens as sensitized males prevailed. Positive results were of higher class in males also. We registered very big up to functional correlation in the hypersensitivity to birch, apple and hazelnut allergens. CONCLUSION: OAS patients show concomitant hypersensitivity to many allergens as sIgE levels to pollens and fruits are the highest.

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Authors: Mirela Borislavova Marinova-Takorova, Dobrina Karayasheva, Ekaterina Boteva

INTRODUCTION: Despite of the significant improvement, methacrylate-based composites still exhibit polymerization stress forces, which could lead to damages in adhesion to tooth structures and microleakege, postoperative sensitivity and secondary caries. The aim of this study was to compare the microleakage at the interface between cavity walls and giomer and silorane-based composite material restorations. MATERIAL AND METHODS: Eighteen extracted human teeth were used in this study. Two types of cavities were prepared on each tooth. The teeth were randomly assigned in two groups, each one with 9 teeth (18 cavities). The first group was restored with the giomer Beautiful II and the second one with Filtec Silorane. The samples were subjected to 400 thermo cycles. The teeth were immersed in a 2% methylene blue buffered solution for 24 hours and rinsed under running tap water for 24 hours. They were hemi-sectioned longitudinally bucco-lingually through the center of the restoration and mycroleakage analysis was done. RESULTS: None of the tested materials was without any microleakage. The average microleakage scores for the giomer were 0.72±0.83 (type I cavities - 1.00±0.87; type II cavities - 0.44±0.73) and for the silorane - 0.33±0.69 (type I cavities - 0.56±0.88; type II cavities - 0.11±0.3.3). CONCLUSION: Based on the data obtained from the present study it can be concluded that silorane-based composite revealed less microleakage compared to the giomer. The cavities with smaller sizes revealed less microleakage as was expected in our null hypothesis.

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Authors: Vassil Svechtarov, Miriana Hristova, Savina Nencheva-Svechtarova, Tsvetan Tonchev

INTRODUCTION: One of the most important signs and symptoms of temporomandibular disorders (TMD) is deviation or restriction in the mandibular range of motion. Limited or increased movement is considered as a sign of dysfunction, so measurement and evaluation of mandibular movement ranges are considered important parameters within the clinical examination and a significant component in the treatment and follow up of the temporomandibular disorders. MATERIAL AND METHODS: A total of 34 articles are included in this comprehensive review of the relevant studies on mandibular range of motion related to temporomandibular disorders. This review provides summarized clinical and cephalometric analyses focused on the three planes of the mandibular range of motion used in all classifications and diagnostic criteria for temporomandibular disorders. RESULTS AND CONCLUSION: The majority of the studies show variations in the degree of mandibular movements in patients with TM pathology. This review of the literature presents a synthesized version of the basic parameters of the mandibular movements that can be considered in the diagnosis of temporomandibular disorders in accordance with the postulates of the relevant research and diagnostic criteria.

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Authors: Kalina Georgieva, Metodi Abadjiev

INTRODUCTION: The advantages of injection molding system (IMS) are precise adaptation of acrylic to master cast, continuous compensation of acrylic shrinkage, low porosity and better physical properties of dentures. Traumatic, toxic and allergic complications are reduced. The existing IMS produces only one denture at a time. Using standard capsules leads to waste of material. Removable partial acrylic dentures (RPAD) with wire clasps haven’t been fabricated yet. MATERIALS AND METHODS: The objective is to construct a device for serial injection fabrication of acrylic dentures optimizing both working time and cost of restoration. The device should: ❖ provide a precise adaptation of material to master cast ❖ reduce residual monomer ❖ fabricate a lot of dentures for a short time ❖ fabricate RPAD with wire clasps ❖ optimize the amount of material. A prototype of the device is designed and constructed. RESULTS: The new device is based on the existing IMS. The following improvements are applied: ❖ The serial fabrication is achieved by dividing the injection and polymerization process by including a specially designed cap which is fixed on the flask after acrylic injection. It provides continuous pressure during the polymerization process. This allows fabrication of large number of dentures at the same time, injected by a single pneumatic cylinder. ❖ RPAD with wire clasps are fabricated by fixing the clasps with cold-cured acrylics and mechanical retention in the master mast. ❖ Capsules for multiple fabrication are used. CONCLUSION: A serial injection of large number of dentures as well as separate processing of each of them is possible at a time. The waste of material is reduced. Fabrication of RPAD with wire clasps is achieved.