Notation - Deciduous mandibular central incisors are designated by uppercase letters in the universal system of notation. - The right deciduous mandibular central incisor is known as P. - The left deciduous mandibular central incisor is known as O. - In the international notation, the right deciduous mandibular central incisor is known as 81. - The left deciduous mandibular central incisor is known as 71. - In the universal system of notation, permanent mandibular central incisors are designated by numbers. - The right permanent mandibular central incisor is known as 25. - The left permanent mandibular central incisor is known as 24. - In the Palmer notation, a number is used in conjunction with a symbol designating the quadrant. - Both central incisors have the number 1, but the right one has the symbol ┐, while the left one has ┌. - In the international notation, the right permanent mandibular central incisor is known as 41, and the left one is known as 31.

Anatomy - The central incisors have fossa on their lingual surfaces. - The mesial and distal proximal contacts are located in the incisal third. - The facial and lingual heights of contour are in the cervical third. - This is consistent with all incisors and canines. - The central incisors do not have cusps.

Appearance and Function - The mandibular central incisor is located on the jaw, adjacent to the midline of the face. - Its function includes shearing or cutting food during mastication. - The tooth does not have cusps but has an incisal ridge or incisal edge. - The deciduous mandibular central incisor has incisal ridges that give it a serrated appearance. - The permanent mandibular central incisors are usually the first teeth to appear in the mouth, around 6-8 months of age.

References - Ash, Major M. and Stanley J. Nelson, 2003. - Wheelers Dental Anatomy, Physiology, and Occlusion. - 8th edition.