ABSTRACT
The purpose of this study was to evaluate the possible structural variations of axial condyle morphology and horizontal condylar angle between patients with internal derangement and asymptomatic volunteers. Forty-five symptomatic patients and 31 asymptomatic volunteers (AV) were included in this study. All subjects had bilateral high-resolution magnetic resonance imaging scans. Axial condyle morphology was evaluated using these images and classified into four diagnostic groups: convex, flat, and concave anterior surfaces, and tapered form. The angulation between the condylar long axis and the transversal plane was then measured. A Wilcoxon-Whitney-Mann-U-test demonstrated no significant differences in the horizontal angulation of the patients with disk displacement with reduction (DDR) (24.35+/-9.31) as compared to patients with displacement without reduction (DDN) (25.61+/-10.11) and asymptomatic volunteers (25.68+/-9.31) (AV). Eighty percent of the flat type condyles and 73.3% of the tapered type condyles belonged to the symptomatic patients with disk displacement with reduction (DDR) and without reduction (DDN). Chi-square test demonstrated significant differences between the diagnostic groups of condyle types (p<0.01). A comparison of the angular difference of right and left joints of asymptomatic volunteers and patients using the Wilcoxon-Whitney-Mann-U test showed that the results of the asymptomatic volunteers were significantly lower (p = 0.05). The conclusion that an increase in the horizontal condylar angle is a predisposing factor for the development of internal derangement or that the derangement develops during the prognosis of the disorder could not be clearly stated based on the results of this study. It is proposed that the difference between condyle morphology in patients with disk displacement and asymptomatic volunteers may be a result of the remodeling or degeneration caused by the disorder.
Subject(s)
Mandibular Condyle/pathology , Temporomandibular Joint Disorders/pathology , Bone Remodeling/physiology , Cephalometry , Chi-Square Distribution , Female , Humans , Joint Dislocations/pathology , Joint Dislocations/physiopathology , Magnetic Resonance Imaging , Male , Observer Variation , Osteoarthritis/pathology , Osteoarthritis/physiopathology , Prognosis , Reproducibility of Results , Risk Factors , Statistics, Nonparametric , Temporomandibular Joint Disc/pathology , Temporomandibular Joint Disorders/physiopathologyABSTRACT
This study examined the effect of four different post systems, Cast Post, Para Post, Flexi-post and Fil Post, on the fracture resistance of crowned endodontically treated teeth. The Flexi-post and Para Post groups showed significantly higher resistance to fracture than the others. Horizontal root fractures were seen in the prefabricated post groups compared with vertical root fractures in the Cast Post group. Findings of this study suggest that the choice of prefabricated post systems is important in determining maximum resistance to fracture in teeth that have been endodontically treated.
