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Статистикаقناة خاصة طب اسنان/ المرحلة الخامسه / جامعة المشرق
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🛑طلبة المرحلة الرابعة سيكون موعد توزيع نتائج العام الدراسي ٢٠٢٥-٢٠٢٦ يوم غد الاربعاء ٢٤/٦/٢٠٢٦ حسب التوزيع ادناه ا،ب،ث في قاعة A1 في الساعة 10:00 ج،ح،خ،د،ر في قاعة A2 في الساعة 10:00 ز،س،ش،ص في قاعة A3 في الساعة 10:00 ض،ط،ع،ف في قاعة A1 في الساعة 11:00 ق،ك،ل،م في قاعة A2 في الساعة 11:00 ن،ه،ي في قاعة A3 في الساعة 11:00 يرجى الانتباه الى النقاط الاتية 🛑لا تسلم النتيجة بدون برائة الذمة الخاصه بالطالب 🛑الاتزام بالوقت المحدد للتوزيع 🛑لا تسلم النتيجة لمن لم يكمل النواقص المطلوبة من قسم التسجيل
11) What happens to the permeability of cementum with age, and what are the implications when it is exposed to the oral environment? A) Permeability increases with age, making it less susceptible to bacterial invasion. B) Permeability remains constant throughout life, preventing any diffusion from the oral environment. C) Cementum becomes completely impermeable in older individuals, protecting against all external substances. D) Permeability diminishes with age, but exposed cementum can still be invaded by bacteria. Answer: D) Permeability diminishes with age, but exposed cementum can still be invaded by bacteria. ✅ ⸻ 12) Which pair represents the main ground substances found in the periodontal ligament? A) Lipids and nucleic acids. B) Water and electrolytes. C) Calcium and phosphate. D) Proteoglycans and glycoproteins. Answer: D) Proteoglycans and glycoproteins.✅ ⸻ 13) What is the most effective strategy for minimizing the risk of developing ankylosis in a susceptible tooth? A) Surgical removal of the periodontal ligament to prevent its inflammation and subsequent obliteration. B) Regular application of topical fluoride to strengthen the cementum layer against resorption. C) Proactive management of endodontic infections and correction of traumatic occlusal contacts. D) Dietary modifications to reduce sugar intake, thereby decreasing the overall inflammatory load in the oral cavity. Answer: C) Proactive management of endodontic infections and correction of traumatic occlusal contacts. ✅ ⸻ 14) About cementum: A) Both cellular and acellular cementum are produced by cementoblasts. B) Cementum formation is most rapid in the apical regions to compensate for tooth eruption and attrition. C) Cementum is thicker in mesial than in distal surfaces because of functional stimulation from distal drift over time. D) A & B. Answer: D) A & B.✅ ⸻ 15) What are the terminal portions of principal fibers that insert into cementum and bone called? A) Oblique fibers. B) Apical fibers. C) Alveolar crest fibers. D) Sharpey’s fibers. Answer: D) Sharpey’s fibers.✅ ⸻ 16) Cementum overlaps the enamel at the cementoenamel junction in about: A) 60–65% of cases. B) 30% of cases. C) 5–10% of cases. D) 80% of cases. Answer: A) 60–65% of cases.✅ ⸻ 17) Which of the following is the principal cell type of the gingival epithelium? A) Keratinocytes. B) Melanocytes. C) Osteocytes. D) Fibroblasts. Answer: A) Keratinocytes.✅ ⸻ 18) Which of the following parts of alveolar bone gives attachment to principal fibers of periodontal ligament? A) External cortical plate. B) Alveolar bone proper. C) Cancellous trabeculae. D) Basal bone. Answer: B) Alveolar bone proper.✅ ⸻ 19) Alveolar bone proper: it is a thin layer of compact bone forming the inner socket wall (lines the alveolus), which is seen as ………. in radiographs. A) The radicular bone. B) The lamina dura. C) The spongy bone. D) The interradicular bone. Answer: B) The lamina dura.✅ ⸻ 20) A 10-year-old patient presents with an ankylosed permanent mandibular first molar, what is the most significant long-term developmental consequence for this patient’s oral health? A) Increased risk of periodontal disease in adjacent teeth due to altered occlusal forces. B) Enhanced bone density around the ankylosed tooth, making future orthodontic treatment more challenging. C) The tooth will likely become submerged relative to erupting adjacent teeth, potentially leading to occlusal discrepancies and space loss. D) A heightened sensitivity to temperature changes due to the loss of the periodontal ligament’s insulating properties. Answer: C) The tooth will likely become submerged relative to erupting adjacent teeth, potentially leading to occlusal discrepancies and space loss ✅.
10) Under certain pathological conditions, which cells found close to the cementum can proliferate rapidly and lead to the formation of cysts and tumors of the jaws? A) Mast cells. B) Epithelial rests of Malassez. C) Progenitor cells. D) Osteoblasts. Answer: B) Epithelial rests of Malassez. ✅ ⸻
1) In an adult jaw, what type of bone marrow is predominantly found, and how might foci of red bone marrow appear radiographically? A) Red marrow; as zones of radiopacity. B) Fatty or yellow marrow; as zones of radiolucency. C) Cancellous marrow; as dense white areas. D) Cortical marrow; as thin, dark lines. Answer: B) Fatty or yellow marrow; as zones of radiolucency. ✅ ⸻ 2) The alveolar bone proper (ABP) is histologically characterized by several features. Which statement accurately describes a characteristic of the ABP? A) It is primarily composed of cancellous trabeculae, providing structural support. B) It contains Volkmann’s canals, allowing blood vessels, lymphatics, and nerves to connect the PDL with cancellous bone. C) It appears as a radiolucent line surrounding the tooth root on radiographs. D) It is the external plate of cortical bone that surrounds the entire alveolar process. Answer: B) It contains Volkmann’s canals, allowing blood vessels, lymphatics, and nerves to connect the PDL with cancellous bone. ✅ ⸻ 3) What is the primary function of the periodontal ligament? A) To produce saliva for oral lubrication. B) To form the enamel layer of the tooth. C) To connect the tooth root with the alveolar bone. D) To provide sensory innervation to the tooth pulp. Answer: C) To connect the tooth root with the alveolar bone. ✅ ⸻ 4) What critical functional difference exists between a natural tooth and a successfully integrated dental implant? A) The bone around implants remodels at a significantly faster rate than the bone supporting natural teeth. B) Implants are inherently stronger and less prone to fracture than natural teeth because of their direct bone integration. C) Natural teeth possess a shock-absorbing mechanism and sensory feedback that implants lack, impacting occlusal load distribution and proprioception. D) Implants are more susceptible to bacterial infection due to the absence of a protective cementum layer. Answer: C) Natural teeth possess a shock-absorbing mechanism and sensory feedback that implants lack, impacting occlusal load distribution and proprioception. ✅ ⸻ 5) A clinician observes a healthy, stippled appearance on a patient’s attached gingiva. This characteristic texture is a direct result of the intricate interplay between which two microscopic features? A) The gingival sulcus and the junctional epithelium. B) The oral epithelium and the mucogingival junction. C) The gingival fibers and the underlying alveolar bone. D) The rete pegs of the epithelium and the connective tissue papillae. Answer: D) The rete pegs of the epithelium and the connective tissue papillae. ✅ ⸻ 6) ………. is the branch of dentistry concerned with prevention and treatment of periodontal disease. A) Periodontology. B) Prevention. C) Periodontics. D) Periodontal therapy. Answer: C) Periodontics ✅ ⸻ 7) ………. is defined as the space or shallow crevice between the tooth and the free gingiva. A) Interdental gingiva. B) Col. C) Gingival sulcus. D) Free gingival groove. Answer: C) Gingival sulcus. ✅ ⸻ 8) Regarding the thickness of the alveolar process, which statement is accurate? A) The distance between the crest of the alveolar bone and the cementoenamel junction decreases with age. B) The thickness is uniform across all regions of the maxilla and mandible. C) The thickness varies depending on the position of the teeth, with labially positioned teeth having thin labial radicular bone. D) Teeth positioned labially in the arch typically have thicker labial radicular bone and thinner lingual radicular bone. Answer: C) The thickness varies depending on the position of the teeth, with labially positioned teeth having thin labial radicular bone. ✅ ⸻ 9) Where is the mucogingival junction typically absent? A) Between the attached gingiva and the alveolar mucosa. B) On the palatal side of the gingiva. C) On the facial surface of the gingiva. D) On the lingual surface of the gingiva. Answer: B) On the palatal side of the gingiva .✅ ⸻
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