BACKGROUND This study investigates CAD/CAM ceramic cusp-replacing restoration resistance with and without buccal cusp replacement under static and dynamic cyclic loads, monitored using the acoustic emission (AE) technique. METHOD The cavity was designed in a typical MODP (mesial-occlusal-distal-palatal) restoration failure shape when the palatal cusp has been lost. Two ceramic restorations [w...

This clinical report describes a repair protocol for cusp fracture of a failed amalgam-dentin complex. A maxillary right first premolar with an amalgam restoration presented a buccal cusp fracture. Chairside repair has been undertaken by conditioning the existing amalgam restoration with silica coating (30 μm CoJet®-Sand), phosphoric acid etching the beveled enamel surface, priming dentin, and ...

AIM To investigate the effects of endodontic treatment, post placement and ceramic restoration type on the fracture resistance of premolars. METHODOLOGY One hundred and twenty teeth maxillary premolars were allocated to four groups (A-D; n = 30). In group A, mesio-occlusal-distal-inlays with a buccal and palatal wall of 2 mm (MOD), in group B partial onlays with palatal cusp coverage and in g...

PURPOSE Previous reports suggested that cusp fracture strength increases with the use of bonded composites. The purpose of this study was to assess fracture resistance of undermined cusps, when supported by a layer of bonded composite, in extensive occlusal carious lesions. METHODS Primary and permanent molars in children that were treated included those with extensive occlusal caries with un...

Mitral prosthetic valve regurgitation due to stent fracture with consequent cusp prolapse occurred in two patients with a Wessex porcine bioprosthesis.

Teeth are often assumed to be optimal for their function, which allows researchers to derive dietary signatures from tooth shape. Most tooth shape analyses normalize for tooth size, potentially masking the relationship between relative food item size and tooth shape. Here, we model how relative food item size may affect optimal tooth cusp radius of curvature (RoC) during the fracture of brittle...

The aim of this study is to compare the effect of various restorative materials on fracture resistance in maxillary premolars. Premolars (n = 64) with no restorations or cracks were selected. MOD cavities were prepared considering the buccolingual width to be equal to half of the intercuspal distance. The specimens were randomly divided into 8 groups, 8 specimens each: group A intact teeth, gro...

T he widespread use of pins to provide retention for amalgam restorations began with Markley’s’ description of cemented stainless steel pins. In 1966 the selfthreading pin technique was introduced.2 Unlike cemented pins, which rely on cement to hold them in place, self-threading pins are larger than the pinhole and are threaded into it. The cutting action of the threads retains self-threading p...

AIM To compare the cusp fracture resistance of teeth restored with composite resins and two post systems. METHODOLOGY Eighty extracted single-rooted human maxillary premolars were randomly assigned to eight groups (n = 10). Group 1 (control) did not receive any preparation. From groups 2 to 8, the teeth were root filled and mesio-occluso-distal (MOD) cavities were prepared. Group 2 remained u...

AIM To report the successful and conservative management of a fractured immature permanent maxillary incisor tooth with talon cusp by fracture reattachment. SUMMARY Coronal fractures of the maxillary anterior teeth are common dental injuries. Among these, the complicated fractures especially in immature teeth require an unambiguous treatment without any delay. When the tooth fragment is avail...