National Dental Assisting Examining Board (NDAEB) Practice Exam

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Prepare for the National Dental Assisting Exam with comprehensive quiz questions, including multiple choice and detailed explanations. Equip yourself for success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Which group of fibres forms a band around the neck of the tooth?

Circular
Transseptal
Apical
Oblique

The correct answer is: Circular

The correct answer is the group of fibres that forms a band around the neck of the tooth is the circular fibres. These fibres are a part of the gingival connective tissue and encircle the necks of the teeth, providing support to the gingival tissue. Their primary function is to help maintain the position of the gingiva and protect the periodontal attachment against external forces. The circular arrangement allows these fibres to help adapt the gingiva closely to the tooth surface, contributing to the integrity of the periodontium and preserving the health of the surrounding soft tissues. Other fibre groups, such as transseptal, apical, and oblique fibres, serve distinct functions related to the periodontal attachment of teeth and the support structures but do not specifically encircle the neck of the tooth. Transseptal fibres connect adjacent teeth and help maintain the integrity of the interdental papillae. Apical fibres are located at the apex of the tooth root and assist in securing the tooth within the socket. Oblique fibres, which run from the cementum to the alveolar bone, help bear the occlusal load during chewing and provide resistance to vertical forces.