one of the important issues in hydraulic engineering is inspection of local scour depth around bridge pier. using piles is one of the ways for confronting local scour and erosion. in this study, the experiments were conducted in an 8m long, 0.5m deep and 0.25m wide flume. and the effectof using piles and number of them observed on the amount of scour in three different frude numbers. the shape ...

Introduction. One of the criteria of implant therapy success is marginal bone loss. The objective of the study was to assess the correlation between peri-implant marginal bone loss and implant-abutment connection systems used in the same patient, as well as other specific characteristics of implant treatment. The initial research hypothesis assumed that there was no difference in marginal bone ...

Although this is comparable to the 90 per cent survival rates of conventional bridges,3 dentists often question whe ther resin-bonded bridges are re liable for restorations. The main reason for the failure of this type of treatment is the debonding of the metal framework from the abutment teeth. The selection of non-mobile abutment teeth, preparation to enhance retention and resistance, the sel...

This article discusses a method for the predictable fabrication of fixed detachable maxillary reconstructions that abut and precisely follow the gingival contours--regardless of implant angulation or position. The technique reorders the traditional implant protocol and delays abutment selection until the definitive tooth position has been established. In this manner, final abutment selection an...

BACKGROUND Accumulating evidence suggests that alveolar crestal bone resorption occurs as a result of the microgap that is present between the implant-abutment interface in dental implants. The objective of this longitudinal radiographic study was to determine whether the size of the interface or the microgap between the implant and abutment influences the amount of crestal bone loss in unloade...

BACKGROUND It has been recently observed that in implants with screw-retained abutments, in in vitro as well as in vivo conditions, bacteria can penetrate inside the internal cavity of the implant as a consequence of leakage at the implant-abutment interface. An alternative to screw-retained abutments is represented by implants that can receive cemented abutments. In this case, the abutment goe...

The production of customized Ti-6Al-4V ELI dental implants by electron beam melting technology makes it possible to mass produce customized dental implants which introduce a porous surface to promote better osseointegration. By fabricating the root-form implant and the abutment as one piece, the authors expect to eliminate fracturing at the abutment screw and prosthetic screw. This paper descri...

Retrieval of cement-retained implant prostheses can be more demanding than retrieval of screw-retained prostheses. This case report describes a simple and predictable procedure to locate the abutment screw access openings of cementretained implant-supported crowns in cases of fractured ceramic veneer. A conventional periapical radiography image was captured using a digital camera, transferred t...

Abutment screw fracture, although uncommon, occurs in clinical practice (Fig. 1,A). In most circumstances, the fractured end can be retrieved and replaced by a new abutment screw. However, sometimes the screw cannot be removed conservatively. By using rotary instruments, internal threads of the screw hole may be damaged and the implant rendered useless. To overcome these problems, this article ...

This study aimed to evaluate the influence of the type of prosthetic abutment associated to different implant connection on bone biomechanical behavior of immediately and delayed loaded implants. Computed tomography-based finite element models comprising a mandible with a single molar implant were created with different types of prosthetic abutment (UCLA or conical), implant connection (externa...