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Register a new userEvaluation of Polymerization Shrinkage of Provisional Materials Based on Di-Methacrylate (in Vitro)
تقييم التقلص التصلبي لمواد تعويضية مؤقتة أساسها ثنائي ميتاكريلات مخبرياً
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ميرزا علاف( باحث )
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خلفية البحث و هدفه: تراجع استعمال التعويضات المؤقتة الأكريلية و عديدات التماثر بشدة بسبب تدني متانتها، و سوء انطباقها الحفافي، و عدم ثبات لونها. و ظهرت أنظمة راتنجية جديدة ثنائية ميتاكيلات: Dimethacylic Resins لتحسين خصائصها الفيزيائية، و الميكانيكية. هدفت هذه الدراسة المخبرية إلى تقييم تشوه التقلص التماثري، و الحرارة المنتشرة خلال التفاعل التصلبي لثلاث مواد راتنجية تعويضية مؤقتة جديدة أساسها ثنائي ميتاكريلات ، و واحدة شاهدة من أحادي ميتاكريلات.
Background& Objective: Acrylic resin, poly-methacrylate provisional materials, have been no longer used because of low strength, poor marginal fit, low resistance, and color stability. New resin systems, such as higher (meth) acrylates, and di-methacrylate were developed to improve the mechanical and physical properties. Investigate polymerization shrinkage-strain, and Exo-thermic peak-temperatures of three new provisional materials based on di-methacrylate, and one of mono-methacrylate.
References used
Moszner N., Fischer K., Angermann J. A partially aromatic urethane dimethacrylate as a new substitute for Bis-GMA in restorative composites; Dental Materials, 2008, 24,5:694-699
Podgorski M. Synthesis and characterization of acetyioxyprpolenedimethacrylate as a new dental monomer; Dental Materials 2011, 27,8: 748-754
Baroudi K., Saleh A., Silikas N. Shrinkage behavior of flowable resin-composites related to conversion and filler-fraction; Journal of Dentistry, 2007,35,8: 651-655
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New resin systems( di-methacrylates) were developed to improve the
mechanical and physical properties of provivinal to investigate mechanical srength(edge- strength,
diametrical tensile strength) and polymrrization(degree of conversion) of three newdi-methacrylates
provisionals, and one of mono-methacrylate.
Ring-opening monomers with a reduced shrinkage stress “silorane" are being
used as matrix resins for recently introduced dental composites. Thisstudy aimed to analyzethe
mechanical behavior(Flexural StrengthFS, Abrasion Resistance AR) of the silora
ne-based composite
(Filtek P90) in comparison to two methacrylate-based composites (Tetric- Evo Ceram & packable
hybridTetric Ceram HB).
macrocyclic hydrazone Schiff base was synthesized by reaction of
succinicdihydrazide, Adipicdihydrazide with acetylacetone, adipicdihydrazide
with terephtaldialdehide and sebacicdihydrazide with terephtaldialdehide.
This research aims to study the effect of adding inorganic waste (Marble powder -
glass powder) on the volumetric and longitudinal shrinkage curves at unsaturated polyester
resin, tests showed that samples exposed to volumetric and longitudinal shr
ink and
occurrence of consecutive gradients in volumetric shrinkage values. Whatever the ratio of
the added materials (marble powder - the glass powder) will effect the behaviour of the
unsaturated polyester hardening, that means it will effect the volumetric shrinkage.
It is necessary to study the volumetric and longitudinal shrinkage values because
they affect the product size to be dealt with, this value should be taken into account in the
design so that should be added this amount of volumetric shrinkage to the dimensions to
designed templates in order to avoid potential variations occurring in the final product.
Preliminary results showed that the value of volumetric shrinkage got up (5%) and the
curves tend to stability, almost three weeks after the initial hardening incident.
The aims of this study were to evaluate the microleakage in the Class II Cavities Restored with methacrylate resin composite (Tetric Ceram HB) or silorane resin composite (P90 Filtek) that had been stored in different situations and temperatures. Mat
erials and Methods: thirty six intact human upper first premolars were employed. Two Class II cavities with specific dimensions had prepared on each tooth mesially and distally. Teeth were Restored by Methacrylate Resin (HB IVOCLAR), Silorane Resin (P90), Under three different conditions: Group (A): application of composite and Adhesive System at room temperature (24°C), Group (B): application of composite and Adhesive System, immediately after removal from refrigerator temperature (4°C), Group (C): application of composite and Adhesive System, 30 minutes after removal from the refrigerator at room temperature (24°C).Results: This study observed a statistically significant increase in microleakage when applying each of methacrylate composite (HB IVOCLAR) and silorane composite (P90) immediately after removal from refrigerator temperature (4°C) Compared when applied at room temperature (24°C) and when applied 30 minutes after removing from refrigerator temperature, no significant differences were found between silorane composite (P90) and Methacrylate composite (Tetric HB) in microleakage when comparing the two types of resin in the three ways used in storing both resins.
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