The term "Green shrinkage" is related to-
সঠিক উত্তর
সঠিক উত্তর: Firing porcelain
সঠিক উত্তর
সঠিক উত্তর: Firing porcelain
ভুল বা সঠিক হলে সাথে সাথেই ব্যাখ্যা সহ উত্তর দেখতে পারবেন।
Ideal age of interceptive orthodontics is -
Interceptive orthodontics aims to intercept and correct a developing malocclusion at an early stage, before it becomes fully established. This window corresponds to the mixed dentition period (roughly 6–12 years), when both primary and permanent teeth are present. During this period, problems such as crossbites, crowding, habits (thumb sucking), and arch-length discrepancies can be corrected more easily because the jaws are still growing and teeth are still erupting, making treatment simpler and more effective than after the permanent dentition is fully established.
Reference: Proffit WR, Fields HW, Sarver DM. Contemporary Orthodontics, 6th ed. Chapter on Early Treatment (Interceptive Orthodontics).
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১০ মার্কের MCQ কুইজএই প্রশ্নের বিশেষজ্ঞ বিশ্লেষণ
"Green shrinkage" (also called firing shrinkage) refers to the volumetric shrinkage that occurs during the initial low-bisque firing stage of dental porcelain, before the particles have fully fused and sintered. As the unfired ("green") porcelain powder is heated and its particles begin to fuse together, the porous mass condenses and shrinks considerably (up to ~30-40% in volume) — this early-stage shrinkage during firing is termed green shrinkage.
Reference: Anusavice KJ. Phillips' Science of Dental Materials, 12th ed. – Dental Porcelain: Firing Shrinkage.
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