Evaluating the Correlation between Overjet and Skeletal Parameters Using DVT

Abstract

Aim. To evaluate the degree of correlation between a dental parameter of immediate clinical relevance (overjet) with skeletal (ANB angle) and dentoskeletal parameters such as the IMPA angle and upper incisor-bispinal angle. Materials and Methods. A sample of 42 subjects, all in complete permanent dentition and without a history of orthodontic treatment or systemic pathologies, was subdivided into 2 groups: group 1 consisted of 25 subjects with ANB angle 0°-4° (skeletal class I), and group 2 was made up of 17 subjects with ANB angle >4° (skeletal class II). Each subject underwent cone-beam computed tomography (CBCT). For each right and left CBCT, the following parameters were measured: (1) ANB, (2) OJ (overjet), (3) IMPA angle, and (4) upper incisor-bispinal angle (U1/ANS-PNS). Results. Analysis of the entire sample revealed that both right and left overjets were correlated in a statistically significant fashion (P < 0.001) with ANB. No correlation between overjet and IMPA emerged, while a weak correlation between overjet and the left U1-bispinal plane was ascertained. Conclusions. Overjet may be a reliable predictor of ANB, and to a lesser extent the U1-bispinal plane, particularly in skeletal class II.

Figure 1

Examples of CBCT right and left of two subjects. The first two figures belong to a subject with ANB 0°–4° (skeletal class I), the second two to a subject with ANB >4° (skeletal class II). In the images, axes and angles like ANB, IMPA, U1-bispinal plane, and overjet were drawn to explain the aim of this work. In the research, each parameter was analysed via NNT NewTom 3G software using particularly secondary reconstruction.