OBJECTIVE The aim of this study was to assess the resistance of fracture of mesio-occlusal-distal (MOD) ceramic inlays and composite fillings in premolars and to compare fracture modes between the groups. MATERIAL AND METHODS Twenty seven extracted intact human premolars were selected and divided into three groups: I - intact teeth (control group), II - MOD cavities restored with indirect cer...

PURPOSE This in vitro study aimed to compare the failure load and failure characteristics of two different zirconia framework designs of premolar crowns when subjected to static loading. MATERIALS AND METHODS Two types of zirconia frameworks, conventional 0.5 mm even thickness framework design (EV) and 0.8 mm cutback of full contour crown anatomy design (CB), were made for 10 samples each. Th...

Data have been presented indicating that changes occur in the dental structures of growing albino rats fed diets adequate except for extreme restriction of inorganic salts (Arnim et al.2). Marked rarefaction of the alveolar bone and the formation of irregular dentine containing few tubules, many spaces, and occasional cells were observed. This unusual dentine was most prominent in the cusps of ...

BACKGROUND AND AIMS The present study evaluated the most common reasons for replacing amalgam restorations in a university clinic. MATERIALS AND METHODS A total of 217 restorations which needed to be replaced were clinically and radiographically evaluated in a period of 4 months. The frequencies of reasons for replacing amalgam restorations were calculated: The assessed items included recurre...

There are many treatment options for the pediatric patient with a talon cusp (TC). The purpose of this paper was to report the case of a TC involving a primary maxillary right central incisor in a 14-month-old male causing displacement of the affected tooth. The etiology of a TC is thought to be a disturbance during the morphodifferentiation stage of tooth development. Clinical problems include...

Aortic valve regurgitation is an uncommon consequence of closed chest injury. It is caused by damage to the valve apparatus (ruptured cusp) or when subadventitial rupture of the ascending aorta causes prolapse of a subjacent valve cusp. Aortic valve regurgitation was detected in 4 patients (2 men and 2 women, 30 to 65 years old) who had sustained multiple injuries in road accidents 1 week to 30...

objective: in all ceramic fixed partial dentures the connector area is a common fracture location. the survival time of three-unit fixed partial dentures may be improved by altering the connector design in regions of maximum tension. the purpose of this study was to determine the effect of buccolingual increase of the connector width on the stress distribution in posterior fixed partial denture...

We present a continuum theory of fracture which describes the fast propagation of cracks. The theory overcomes the usual problem of a finite time cusp singularity of the Grinfeld instability by the inclusion of elastodynamic effects which restore the selection of the steady state tip radius and velocity. Two different numerical approaches are presented to solve this problem. A sharp interface a...

intentional tooth reimplantation can be an alternative treatment option for teeth with poor or hopeless prognosis where coronal and surgical endodontic treatment(s) are not possible. this technique may help to restore a natural tooth to function in preference to prosthesis/implant replacements. a 38-years old male was referred to private practice with persistent chronic apical periodontitis of ...

The term talon cusp refers to a rare developmental dental anomaly characterized by a cusp-like structure projecting from the cingulum area or cement-enamel junction. This condition can occur in the maxillary and mandibular arches of the primary and permanent dentitions. The purpose of this paper is to report on the presence of talon cusps in the primary dentition of two southern Chinese sibling...