| 词条 | Cementicle |
| 释义 |
| name = Cementicle | synonyms = | image = | caption = | pronounce = | field = Dentistry | symptoms = | complications = | onset = | duration = | types = | causes = | risks = | diagnosis = | differential = | prevention = | treatment = | medication = | prognosis = | frequency = | deaths = }} A cementicle is a small, spherical or ovoid calcified mass embedded within or attached to the cementum layer on the root surface of a tooth, or lying free within the periodontal ligament.[1][2] They tend to occur in elderly individuals.[3][4] There are 3 types:[5][6]
They may be visible on a radiograph (x-ray).[2] They may appear singly or in groups,[1] and are most commonly found at the tip of the root.[6] Their size is variable,[3] but generally they are small (about 0.2 mm[5] – 0.3 mm in diameter).[3] Cementicles are usually acellular, and may contain either fibrillar or afibrillar cementum, or a mixture of both.[3] Cementicles are the result of dystrophic calcification,[3] but the reason why this takes place is unclear.[4] Cementicles are thought to form when calcification occurs around a nidus, a precipitating center. Around this nidus they slowly enlarge by further deposition of calcium salts.[3] Examples of how cementicles are thought to form include:
References1. ^1 {{cite book|author=Chiego Jr. DJ|title=Essentials of Oral Histology and Embryology: A Clinical Approach|url=https://books.google.com/books?id=LMrsAwAAQBAJ&pg=PA133|date=14 April 2014|publisher=Elsevier Health Sciences|isbn=978-0-323-29100-2|page=133}} 2. ^1 2 {{cite book|author1=Bath-Balogh M|author2=Fehrenbach MJ|title=Illustrated Dental Embryology, Histology, and Anatomy|url=https://books.google.com/books?id=uPMLBAAAQBAJ&pg=PA174|date=10 December 2010|publisher=Elsevier Health Sciences|isbn=978-1-4377-2934-4|page=174}} 3. ^1 2 3 4 5 6 7 8 9 10 11 {{cite book|author1=Ghom A|author2=Mhaske S|title=Textbook of Oral Pathology|url=https://books.google.com/books?id=yKqgUT4OAokC&pg=PA122|date=17 September 2010|publisher=Jaypee Brothers Publishers|isbn=978-81-8448-402-1|page=122}} 4. ^1 2 3 {{cite book|author=Kumar GS|title=Orban's Oral Histology & Embryology|url=https://books.google.com/books?id=061EAwAAQBAJ&pg=PA196|date=10 February 2014|publisher=Elsevier Health Sciences APAC|isbn=978-81-312-3801-1|page=196}} 5. ^1 2 3 {{cite book|author=Chatterjee K|title=Essentials of Oral Histology|url=https://books.google.com/books?id=1_ge-OtrElQC&pg=PA112|date=1 December 2006|publisher=Jaypee Brothers Publishers|isbn=978-81-8061-865-9|page=112}} 6. ^1 {{cite book|author=Mosby|title=Mosby's Dental Dictionary|url=https://books.google.com/books?id=hQejBQAAQBAJ&pg=PA115|date=1 August 2013|publisher=Elsevier Health Sciences|isbn=978-0-323-10013-7|page=115}} External links{{Medical resources| DiseasesDB = | ICD10 = | ICD9 = | ICDO = | OMIM = | MedlinePlus = | eMedicineSubj = | eMedicineTopic = | eMedicine_mult = | MeshID = }}{{oral pathology}} 1 : Periodontal disorders |
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