Notation - Universal system of notation designates deciduous maxillary lateral incisors with uppercase letters (D and G) - International notation designates deciduous maxillary lateral incisors with numbers (52 and 62) - Permanent maxillary lateral incisors in universal system are designated by numbers (7 and 10) - Palmer notation uses numbers and symbols to designate quadrant and laterality of the tooth - FDI notation has different numbering system for permanent maxillary lateral incisors (12 and 22)

Development - Primary maxillary lateral incisor develops between 14-23 weeks in utero - Permanent maxillary lateral incisor typically erupts around 8-9 years old - Crown development of the tooth is completed by age 4-5 - Upper lateral incisor is made of 4 lobes of calcification - Upper lateral incisors can have variations in shape and sometimes be missing

Deciduous dentition - Two maxillary lateral incisors in deciduous dentition - Distoincisal angle of deciduous maxillary lateral incisor is more curved than primary maxillary central incisor - Primary lateral incisor is longer cervicoincisally than mesiodistally - Average length of primary lateral incisor is 15.8 mm, with crown length of 5.6 mm and root length of 11.4 mm - Primary lateral incisor crown is wider mesiodistally and has longer roots compared to permanent tooth

Permanent dentition - Two maxillary lateral incisors in permanent dentition - Development of permanent maxillary lateral incisors begins at 10-12 months after birth - Permanent lateral incisor resembles central incisor but is smaller in every dimension except root length - Root of permanent lateral incisor is around 1.5 times the length of the crown - Permanent lateral incisors can have variations in crown shape and can be congenitally missing

Tooth aspects - Labial aspect: Maxillary lateral incisor has rounded mesial and distal incisal angles, smooth surface, and fits into a trapezoid shape - Lingual aspect: Prominent cingulum, concave lingual fossa, and fits into a trapezoid shape - Mesial aspect: Cementoenamel junction sharply inclines towards incisal ridge, fits into a triangle shape - Distal aspect: Distal cervical line is slightly more cervical, may have developmental groove, fits into a triangle shape - References: Citations from various sources for further reading and study