Effect of Tooth Agenesis on Mandibular Morphology and Position

Abstract

Congenital missing teeth (OMIM #106600) is the most common dental abnormality. The aim of the study was to evaluate the effects of tooth agenesis on the total mandibular length, length of the mandibular body and alveolar process, and the mandibular anteroposterior position. The material was obtained from the Department of Orthodontics, Medical University of Warsaw. The study group included 116 patients aged 9–18 years with a congenital absence of at least two permanent tooth buds in the maxilla and/or mandible (mean: 6.2 teeth missing/patient). All patients were Caucasians: 68 (59%) females and 48 (41%) males. The control group included 115 patients without tooth agenesis matched with the age and gender of the study group. A cephalometric analysis was performed, and it was focused on assessing anteroposterior mandibular measurements. This assessment was based on 17 measurements (12 linear and 5 angular). Statistical analysis of the cephalometric measurements between the study group and the control group showed significant changes regarding selected mandibular measurements. Tooth agenesis does not affect the total length of the mandible and the length of the mandibular body, but it might reduce the length of the mandibular arch length and result in a more retrusive mandibular position.

Effect of Diet Consistency on Rat Mandibular Growth: A Geometric Morphometric and Linear Cephalometric Study

“…In our study twenty-four wistar rats were grouped into hard diet group and soft diet group. Wistar rats were the experimental animal of choice because they are small, easy to house, report a minimal social concern, are short-lived and have well-known genetics, closely related to human development [ 12 , 13 , 14 , 15 , 16 ]. We included only female rats in our study in order to minimize any possible bias.…”

“…Therefore the impact of diet consistency on craniofacial growth triggers lots of research. Various experimental studies, mainly in wistar rats, studied the effect of diet consistency to craniofacial growth [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. During the last century, the human masticatory muscles demands seem to be reduced.…”

Tratamento endodôntico do segundo molar decíduo esquerdo inferior em paciente com oligodontia - relato de caso

“…Tooth agenesis can result in malocclusion, atrophy of the alveolar bone and a more retracted position of the mandible and, among the therapeutic options, we can mention orthodontic treatment, prosthetic rehabilitation or implant-supported crowns (De Santis et al, 2019;Jurek et al, 2021). In view of the aforementioned options, the choice of maintaining the deciduous element is defended by Consolaro et al (2021), because in the absence of the permanent element, the process of rhizolysis is slow and happens partially, making the element stable after a few months, allowing the maintenance of space and alveolar bone.…”

Tooth number abnormality: from bench to bedside

“…77 In addition, tooth agenesis may affect the oral arch length, jaw position and craniofacial morphological features. 78,79 Therefore, imaging is necessary for early diagnosis, prompt intervention 80 and multidisciplinary treatment to maintain the aesthetic and functional features of teeth.…”