35 Questions
What is the main pathway for the ingress of irritants from necrotic pulp into peri-radicular tissue?
Apical foramen
Which of the following can carry toxic substances from pulp to periodontium or vice versa?
Lateral (accessory) canals
What formed due to the breakdown of epithelial root sheath of Hertwig before root dentin formation?
Lateral (accessory) canals
What carries irritants from necrotic pulp through the apical foramen into peri-radicular tissue?
Dentinal tubules
Which non-physiological cause is associated with vertical root fracture?
Root perforations
What is the main pathway for irritants if plaque covers the root and reaches the apical vessels?
Apical foramen
What carries toxic substances between dental papilla and dental sac?
Lateral (accessory) canals
What is the physiological cause associated with the breakdown of epithelial root sheath of Hertwig before root dentin formation?
Lateral (accessory) canals
What is NOT a physiological cause associated with the intercommunication between pulpal and periodontal tissues?
Dentinal tubules
What carries toxic substances from pulp to periodontium or vice versa?
Dentinal tubules
What is formed due to the breakdown of epithelial root sheath of Hertwig before root dentin formation?
C- Lateral (accessory) canals
What carries irritants from necrotic pulp through the apical foramen into peri-radicular tissue?
Dentinal tubules
What is the primary aim of the lecture?
To explain the differential diagnosis of endodontic and periodontal lesions
What does little or no pain indicate in the context of subjective signs and symptoms?
Periodontal disease
What is a common radiographic finding associated with periodontal disease?
Generalized angular bone loss
In the context of clinical tests, what does a positive response to percussion indicate?
Periodontal disease
What is the aim of regenerative approach in the treatment alternatives?
To prevent apical migration of gingival epithelium
What is the diagnosis for a 42-year-old male with acute localized pain and localized swelling in the left mandibular molar area, severe throbbing pain, and severe bone loss around the distal root of lower 2nd molar?
Primary periodontal disease with secondary endodontic involvement
What is the cause of bone loss around the distal root in the previous case?
Inaccessible space between lower 7 & 8
What is the diagnosis for a 52-year-old male with recurrent local swelling and drainage near the maxillary right second premolar, widened apical periodontal ligament space, and deep periodontal defect interproximally on the distal aspect?
Concomitant endo-perio lesion
What is the origin of a draining sinus tract near the maxillary right second premolar in the previous case?
Trauma-induced sinus tract
What is one of the educational aims of this lecture?
To explain how to differentiate between caries and periodontal lesions
What do widened apical periodontal ligament space and deep periodontal defect indicate in a radiograph?
Development of periapical lesion
Which condition results in an artificial communication between the root canal system and the periodontium?
Root perforations
What is the classical sign of a longstanding root fracture, usually in the mesiodistal plane?
J-shaped radiographic lesion
What condition leads to apical migration of the epithelial attachment due to progressive periodontal disease?
Primary periodontal lesions
What characteristic is associated with primary endodontic lesions involving a nonvital tooth?
Localized osseous destruction
What is the treatment for primary endodontic lesions without any periodontal involvement?
Root canal treatment alone
Which type of lesion begins in the sulcus and migrates to the apex due to plaque accumulation?
Primary periodontal lesions
What is a characteristic feature of true combined lesions?
Localized osseous destruction
What may mimic clinically the presence of a periodontal abscess in a nonvital tooth with a chronic apical lesion?
Primary endodontic lesions
What is the treatment for primary periodontal lesions?
Periodontal treatment alone
What happens when pulp becomes involved in primary periodontal with secondary endo involvement?
Deep pockets & extensive periodontal disease
What characterizes concomitant pulp and periodontal lesions?
Both diseases exist but no evidence that either disease has influenced the other.
What results from an acute exacerbation of a chronic apical lesion in a nonvital tooth?
Retrograde periodontitis.
This lecture aims to explain the relationship between endodontics and the periodontium, how to differentiate between endodontic and periodontal lesions, and the management of different lesions based on their origin. By the end of this lecture, students should have an understanding of how to diagnose endodontic, periodontal, or combined lesions.
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