Prevalence of maxillary lateral incisor agenesis and associated skeletal characteristics in an orthodontic patient population

Objectives: This study was aimed to investigate the prevalence of maxillary lateral incisor agenesis and associated skeletal characteristics in an orthodontic patient population.

Materials and methods: The records of the 1066 patients seeking orthodontic treatment were screened for maxillary lateral incisor agenesis (MLIA). The following data were recorded for each subject: age; gender; unilateral or bilateral agenesis of MLI and side. The lateral cephalogram of each subject with MLIA was digitally traced. The data were compared to age-matched control orthodontic patients with skeletal Class I.

Results: The prevalence of maxillary lateral incisor agenesis was 4.9% (52 patients) in which 63.5% were females. There was a significant difference between MLIA patients and controls in sagittal relationships (ANB, Wits, AB plane, angle of convexity and Co-A/Co-Gn differential analyses) p?Conclusions: Patients with maxillary lateral incisor agenesis showed a significant tendency for skeletal Class III compared with the Class I control. This could be attributed to maxillary hypoplasia/retrognathia.     

WNT10A coding variants and maxillary lateral incisor agenesis with associated dental anomalies

Congenital maxillary lateral incisor agenesis (MLIA) is one of the most common subtypes of dental agenesis. Because little is known with regard to the aetiology of this anomaly, the aim of the study was to determine the contribution of nucleotide variants in wingless‐type MMTV integration site family, member 10A (WNT10A), msh homeobox 1 (MSX1), and paired box 9 (PAX9) to the risk of MLIA in a Polish population. Coding regions of the selected genes were analysed by direct sequencing in a group of 20 individuals with unilateral and bilateral MLIA, associated or not with other dental anomalies. The frequencies of the identified nucleotide variants were assessed in an additional cohort of patients with isolated dental agenesis (n = 147) and in 178 controls. Mutation screening showed four non‐synonymous substitutions located in the highly conserved coding sequence of WNT10A in five (25%) of the 20 patients. Analysis of genotyping results revealed that three of these variants – p.Arg113Cys, p.Phe228Ile, and the newly identified p.Arg171Leu – may represent aetiological mutations underlying MLIA with associated dental anomalies. No mutations that were potentially aetiologic were identified in MSX1 and PAX9. In conclusion, this is the first report implicating coding variants in the WNT10A gene in the aetiology of MLIA. These results will require further confirmation using larger‐scale studies.     

Unilateral agenesis of the maxillary lateral incisor: space closure versus space preservation in growing patients

A unilateral congenitally missing maxillary lateral incisor is often associated with a small or peg-shaped contralateral tooth. This form of hypodontia is also frequently combined with a generally undersized maxillary dentition, which could therefore be considered a paradigm for esthetic situations where problems of tooth position, size and form need to be connected and resolved. The space opening versus the space closure option should derive from a hierarchy of decisions. When we treat young patients, the restorative solutions should be obtained by a minimally invasive approach, which facilitates both the reversibility and ease of reintervention in the long term.     

Treatment considerations in a geminated maxillary lateral incisor

A patient with anomalous maxillary lateral incisor was referred for endodontic therapy. A diagnosis of irreversible pulpitis of a geminated maxillary lateral incisor was made. The preoperative radiograph revealed an image of a single root canal but in fact the tooth had two separate and distinct root canals. Treatment considerations of this anomaly are discussed.     

Maxillary lateral incisor agenesis; a retrospective cross-sectional study

Objective

This study aims to estimate the prevalence of congenitally missing lateral incisors in a sample of 2662 dental patients in Palestine.

Successful treatment of a two-canaled maxillary lateral incisor

Conventional and surgical therapy was successfully performed on a traumatized two-rooted maxillary lateral incisor. The treatment and rational are discussed along with some probable causes leading to formation of secondary roots and canals in teeth that are normally single rooted with one canal.     

Investigation of the maxillary lateral incisor agenesis and associated dental anomalies in an orthodontic patient population

Objectives: The aim of this study was to investigate the prevalence of maxillary lateral incisor (MLI) agenesis and associated dental anomalies as well as skeletal patterns in an orthodontic population, and then to compare it with the prevalence of these anomalies in the general population.Study Design: The material of the present study included the records of the 3872 orthodontic patients. The followings were recorded for each subject with the agenesis of MLI: Age, sex, unilateral or bilateral absence, anterior-posterior skeletal relationship of the maxilla and mandible, and presence of associated dental anomalies. The occurrence of these anomalies was compared with data previously reported for the general populations. Results: Of the 3872 patients examined, 94 were found to have agenesis of the MLI, representing a prevalence of 2.4 per cent, with females being more frequently observed. The most commonly found associated anomalies were ectopic eruption of maxillary canines and reduced or peg- shaped contralateral incisor with the frequencies of 21.3 per cent and 20.2 per cent respectively.Conclusions: Patients with agenesis of MLI showed a significantly higher prevalence of skeletal Class III malocclusion compared with the general population. The prevalence of ectopic eruption, transposition, and transmigration of the maxillary canine and reduced or peg- shaped MLIs were significantly increased. Key words:Hypodontia, missing laterals, associated dental anomalies.     

Developmental disturbance of maxillary lateral incisor after trauma

Abstract –  Traumatic injury to a primary tooth has a potential to damage the underlying permanent tooth germ. It may lead to developmental disturbance of permanent dentition. The impaction of the permanent maxillary central incisor because of the root dilaceration in children is rare. The purpose of this paper is to report a developmental disturbance of a permanent right maxillary lateral incisor in a 12-year-old girl with a history of trauma at an early age.     

Complex facial radicular groove in a maxillary lateral incisor

A case report of a developmental anomaly known as a radicular groove is presented. This case is unusual in that it is believed to be the first reported case of complex involvement of the entire facial aspect of a tooth root. An alveolar crest to apex facial root defect in a maxillary right lateral incisor of a 12-yr-old black female led to early pulpal necrosis and periapical rarefaction. Clinical and histologic findings as well as morphologic and treatment ramifications are discussed.