16 topics with concise breakdowns: definitions, key facts, and class questions.
This section is the foundation of your future clinical practice. Here we analyze the physicochemical properties and application specifics of all materials a dentist works with daily: from basic classification to modern adhesive systems and aesthetic dental ceramics.
The chapter consistently covers key groups: impression materials (alginate and silicone) and modeling materials, luting and filling compounds (zinc phosphate and polycarboxylate cements, classic amalgams). A separate block is dedicated to prosthetic and endodontic bases: denture base and autopolymerizing resins, dental metal alloys (including noble alloys), abrasive instruments, and root canal filling materials.
During practical classes and credit tests, special attention is paid to working protocols. Instructors most frequently ask about exact indications for selecting silicone impression materials, differences in resin polymerization mechanisms, and the steps of applying adhesive systems. Mastering these topics is the key to creating reliable, safe, and durable restorations.
Can zinc oxide-eugenol cement be placed over arsenical paste?
No, this is strictly contraindicated. Zinc-eugenol compositions set within 6–8 hours, which can cause the toxic substance to seep through and induce a chemical burn of the oral mucosa.
Why is it forbidden to dispense powder and liquid onto the glass long before mixing?
Cement powder has high hygroscopicity. Left in the open air, it absorbs moisture, which disrupts the correct ratio of components and degrades the properties of the future filling.
Free phosphoric acid remains in the material for a long time. Penetrating the dentinal tubules, it causes a chemical burn and pulp necrosis.
Free phosphoric acid remains in the material for a long time. Penetrating the dentinal tubules, it causes a chemical burn and pulp necrosis.
Why should a metal spatula not be used during mixing?
Silicate cement powder is an abrasive material. It can scrape microparticles of metal from the instrument, leading to cement contamination and altered properties.
Why did the mass suddenly start stringing when working with polycarboxylate cement?
This means that the working time (about 3 minutes) has expired. The material has transitioned into a rubber-like state due to the formation of a zinc polyacrylate network structure and is no longer suitable for filling.
Why is a zinc phosphate cement base placed under an amalgam?
It serves as an insulating base that prevents the hard dental tissues from staining dark and protects the pulp from temperature fluctuations caused by the high thermal conductivity of metal.
Master the entire topic in the «Propaedeutics of Dentistry» course
This is a summary. The course covers everything tested in classes and exams.
868 pages of study guides for all topics
Assignments and quizzes after every topic — just like in a colloquium