جستجوی مقالات مرتبط با کلیدواژه « Occlusal plane » در نشریات گروه « پزشکی »

Determining the occlusal plane is one of the essential clinical steps in prosthetic treatment. Intraoral landmark of parotid papilla is used as an adjunct in determining the occlusal plan. The aim of this study was to investigate the exact distance between the parotid papilla and the occlusal plane as an additional criterion for determining the occlusal plane.

In this cross-sectional study, the study group consisted of 148 patients aged 18-50 years old including 74 men attending Sari Dental School in 2019. In maximum intercuspation, vertical distance from the parotid papilla site to the occlusal surface of the first molars of the maxilla was measured by a probe. Data analysis was performed applying Mann-Whitney and correlation test.

The mean distance (mm) between the parotid papilla and the occlusal plane for the right papilla (R) was 6.16, while for the left papilla (L) it was 6.51 (R=6.47 and L=6.70 in men and R=5.84 and L=6.31 in women).  The distance at both the right and left sides was higher in men (P= 0.009 and P= 0.044, respectively). Significant difference was seen between both sides in the distance which was higher at left side (P= 0.03). Findings showed no significant relationship between age and this distance at right (P= 0.083) and left (P=0.065) sides.

The amount of parotid papilla distance to the occlusal plane on both sides was significantly higher in men than that in women. Also, this distance on the left side is significantly higher than the right side. There was no significant relationship between age and the distance stusdied.

Some measurements such as angles and planes drawn in lateral cephalometry have different relationships and correlation coefficients which help to distinguish different types of malocclusions. The aim of this study was to investigate the correlation between ANB, Wits, occlusal plane, and Y-axis cephalometric measurements in patients with class II malocclusion.

A descriptive-analytical and retrospective cross-sectional study was performed using the lateral radiographic images (n=156) in the archive of the Dental Clinic affiliated with Golestan University of Medical Sciences obtained from patients aged 14-18 years of age with class II malocclusion in 2018-2019.

There were 91 (58.3%) lateral radiographic images of female patients, and 65 (41.7%) of male patients. The highest correlation was found between ANB and Wits measurements (r= 0.61) followed by ANB and Y-axis (r= 0.53), Wits and occlusal plane (r= 0.36), and Y-axis and occlusal plane (r= 0.33) and the lowest correlation was seen between ANB and occlusal plane measurements (r= 0.23).

According to current study, it seems that in addition to ANB angle, other cephalometric measurements such as Wits, Y-axis, and occlusal plane can be used to diagnose class II malocclusion (based on their correlation coefficient with ANB).

Occlusal plane in edentulous patients is lost and needs to be reconstructed. The most common method for reconstructing occlusal plane is to make it parallel to the ala-tragus line. There are disagreements about the posterior reference of ala-tragus line. The aim of this study was to determine the best posterior reference of ala-tragus line (superior, middle and anterior references) for reconstructing occlusal plane.

In this descriptive-analytical study, 150 dentate patients with class I relationship enrolled. Patients were placed 1.5 meters from the camera and their head was in NHP mode and symmetrical to the line perpendicular to the horizon. Fox-plane was placed in contact with central incisors and first molars of maxilla and imaging was performed from the right side of the face. The angles required were then measured using AutoCAD 2020.

There were 75 male and 75 female patients (mean age= 23.05±1.69 years) and the mean OT1-OP angle was 8.75, which was the closest to the mean OT1-AT3 angle (8.85). This finding also was repeated in both men and women. Among all patients, OT1-AT3 angle was found to have the highest proximity to the occlusal plane (61. 33%), 53.34% in men and 69.33% in women.

Inferior point on the tragus of the ear in ala-tragus is the best reference for reconstructing the occlusal plane during construction of a removable denture for male and female edentulous patients.

It is Important to make occlusal plane in complete dentures as closely as possible to occlusal plane in natural dentition. In this study it was tried to show the relationship between the occlusal plane in natural dentition to point's Porion-Nasion PN ANS+Frankfort plane and compare occlusal plane in denture teeth to the same points (Porion/Nasion/PN.ANS+Frakfort plane). Methods and Materials: 35 edentulous patients with class I occlusion: 21 male and 14 female, were randomly selected from Isfahan Dental School, department of prosthetic. Complete upper & lower denture was constructed for these patients following standard procedure. After completion of upper & lower prosthesis occlusal plane was marked and lateral cephalometric radiographs was made for them. At the same time 35 adult patients with normal class I occlusion with no history of orthodontic treatment were selected and leteral cephalometric radiographs were done for them. The angle between occlusal plane, frankfort plane and PN. ANS was measured for all seventy patients on radiographs. The results were compared to each other. In this study it was determined that there is an inverse linear relationship between the angle PN.ANS & occlusal plane, Frankfort plane. In patients with natural dentition coefficient of Correlation was 0.989. This relation did not exist in edentulous patients. Coefficient Correlation between two angles was 0.45. Since the only variable between edentulous and edentulous state is occlusal plane, we can conclude that the routine procedure for determining occlusal plane, for all the patients, does not restore the natural state.