Evaluation of the frequency of third molar agenesis according to different age groups

Abstract

Purpose Third molars (M3s) are the most common congenitally missing teeth. The aim of this study was to compare the frequency of M3 agenesis in two different age groups. Methods This study examined the panoramic radiographic images of 1036 patients. Two groups, each consisting of 518 patients, were arranged based on age ranges. The patients aged 12 to 19 years were in the first group and those 20 years and older were in the second group. The frequency of M3 agenesis was examined in both age groups. The distribution of M3 agenesis by sex and jaw was also recorded, along with the number of M3s affected by agenesis. Chi‐square tests were used to examine the relationships between categorical variables. Results M3 agenesis was observed in 29.3% and 20.5% in the first and second groups, respectively; the difference was statistically significant (P < .01). It was more common in female (27.3%) than in male patients (21.4%), and in the maxilla (11.2%) than in the mandible (5.8%), and the differences were statistically significant (P < .05). It was mostly observed forthemaxilla right M3 (18) (30.9%) and in the single quadrant of the jaws (9.7%). Conclusions The frequency of M3 agenesis was more common in patients aged 12 to 19 years than in those aged 20 years and older. Additionally, M3 agenesis was more common in females and in the maxilla.

Estimating the 18-Year Threshold with Third Molars Radiographs in the Southern Italy Population: Accuracy and Reproducibility of Demirjian Method

“…High reproducibility is one of the main reasons for preferring this method to the simple observation of the eruptive sequence of the teeth, which is unreliable and not useful for the goal of determining the adult age [ 28 ]. This is because the assessment of third molar eruption is not reliable due to the absence of a precise age of eruption and the high presence of inclusions and agenesis [ 29 ]. A study by Gambier et al reported a high probability that when the third molars have erupted in the arch, the subject is over 18 years old, but the authors themselves stated that the assessment of the eruption of M3s alone was not sufficient for the determination of whether or not an individual is aged 18 years or older [ 30 ].…”

Frecuencia De Agenesia Del Tercer Molar en La Ciudad De Chiclayo

“…La agenesia es el término que se usa cuando el paciente tiene ausencia congénita de uno o más dientes, puede estar asociado a enfermedades o síndromes (8), sin embargo, hay reportes de agenesia en pacientes no sindrómicos y se relacionan a la evolución humana, llamada también ausencia congénita de un diente o hipodoncia (3). La frecuencia de agenesia de terceros molares en pacientes no sindrómicos ha sido reportada en la literatura a nivel mundial, como González en Portugal 19.1% (4), Ramiro en España 13.11% (5), Pamukcu en Turquía 24.9% (6), Mishra en India 36.8% (7). A nivel Latinoamericano en Ecuador: Huilcarema 60% (9), Solis 16.67% (10), Martínez 45% (11).…”