ABSTRACT
Dilaceration refer to an angulation or sharp bend or curve in the root or crown of formed tooth. It is usually occur due to trauma that lead to white or yellow brown discoloration, crown dilaceration, root dilacerations, crown duplication, root duplication, odontoma like malformation etc. This paper elaborated a useful clinical considerations for diagnosis and treatment planning of a severely dilacerated root of malformed tooth having turner’s hypoplasia.
ABSTRACT
Traumatic injuries lead to fracture of anterior teeth, frequently occurs in dentistry and the prevalence rate of fractured anterior teeth, as a result of traumatic injuries, occurs 8.1 in 1000. The fracture of a tooth is itself a traumatic incident for young patients which leads to functional, aesthetic, psychological problems and reduces patient's quality of life. Various materials are available to restore these types of traumatic injuries, but till date there is no material that has been proved to be as effective as natural structure considering mechanical and biological properties. This case report represents the management of traumatized fractured mandibular anterior teeth with biological posts and coronal restorations with composite.
ABSTRACT
Background: Acrylic resin dentures are susceptible to fracture after clinical use, which is a problem of concern in prosthodontics. Impact failure outside the mouth and flexure fatigue failure in the mouth are two most important causes of fracture of denture base. Aim: This study evaluated the transverse deflection and transverse strength of four commercial brands of heat cure acrylic resin (Stellon, Acrylin-H, Trevalon and Trevalon-HI). Materials and Methods: An experimental design was adapted. Twenty-four rectangular strip specimens, six for each group, were prepared. Strips were finished on the edges and equally from the both the molded surfaces to make strips of specific dimensions. The tests were conducted mainly in accordance with the American Dental Association Specification no. 12/ISO: 1567-1981 (ISO: 6887-1986) for denture base polymer. The transverse deflection and transverse strength were measured by Instron testing machine. Intergroup differences were assessed using student "t" test. Results: The heat cure denture base material D (Trevalon "HI") had the minimum mean value of transverse deflection under different loads. Trevalon "HI" also had minimum value of mean transverse strength among different brands of acrylic resins. There was no statistically significant variation between Stellon, Acrylin-H and Trevalon, but variation was significantly higher with D (Trevalon "HI") vs. Stellon, Acrylin-H and Trevalon. Conclusion: The heat cure denture base material D (Trevalon "HI") was the strongest and C (Trevalon) was the weakest among all materials used in this study. The study showed that the deflection of various denture base resins (A to D) increases proportionately with the increase in load.