Final Answer:
The primary purpose of Horizontal, the fibre group of the periodontal ligament, is to aid in resisting tipping & twisting of the tooth. Thus the correct option is (B).
Step-by-step explanation:
The Horizontal fibre group of the periodontal ligament plays a crucial role in maintaining the stability of a tooth within the alveolar socket. It is specifically designed to resist tipping and twisting forces that may act on the tooth during various functional activities such as biting and chewing. This group of fibres runs horizontally from the cementum of the tooth to the surrounding alveolar bone, providing essential support to prevent lateral movements. The horizontal fibres act as a stabilizing force, ensuring that the tooth remains securely anchored within its socket.Thus the correct option is (B).
Furthermore, the mechanics behind this function can be understood by considering the orientation of the fibres. The horizontal fibres run perpendicular to the long axis of the tooth, creating a resisting force against lateral movements. This anatomical arrangement is biomechanically efficient in counteracting tipping and twisting forces, contributing to the overall structural integrity of the tooth within the oral cavity.
The significance of the Horizontal fibre group becomes particularly evident in situations where external forces may exert lateral pressure on the tooth, such as occlusal forces during mastication. In summary, the Horizontal fibre group serves as a critical component of the periodontal ligament, fulfilling its primary function of resisting tipping and twisting forces to maintain the stability of the tooth in the alveolar socket.