Maintenance of the integrity of the abutment/implant interface is essential and is dependent on the abutment screw retaining a preload. Evaluation of this joint is usually done by manual assessment. The purpose of the current study was to determine whether the Periotest instrument could be used to evaluate abutment screw loosening. A custom-designed apparatus was constructed to measure abutment...

PURPOSE The aim of this study was to evaluate the interface accuracy of computer-assisted designed and manufactured (CAD/CAM) titanium abutments and implant fixture compared to gold-cast UCLA abutments. MATERIALS AND METHODS An external connection implant system (Mark III, n=10) and an internal connection implant system (Replace Select, n=10) were used, 5 of each group were connected to mille...

Bone remodeling and, consequently, soft tissue levels around osseointegrated implants may be influenced by many variables that are considered of prosthetic or biomechanical nature: implant-abutment connection type and geometry (external vs internal), timing of abutment connection (at uncovering vs delayed), abutment material (titanium vs gold vs ceramic), abutment shape and dimensions (convex v...

PURPOSE The purpose of this study is to evaluate the stability of interface between Co-Cr-Mo (CCM) UCLA abutment and external hex implant. MATERIALS AND METHODS Sixteen external hex implant fixtures were assigned to two groups (CCM and Gold group) and were embedded in molds using clear acrylic resin. Screw-retained prostheses were constructed using CCM UCLA abutment and Gold UCLA abutment. Th...

Background: To compare the loss of preload in absence loading and after a fixed number cyclic loadings on 7-mm distal cantilever two different connection systems using all-on-four prosthetic model. Methods: Two equal models an edentulous mandible rehabilitated with technique types abutment system (MUA OT-Bridge) supporting hybrid prosthesis, were used. Initial torque values fixing screw, ten mi...

Abstract The corrosion of reinforced concrete structures in coastal areas turns out to be very severe and can extend significantly windy zones. Additionally, frequent temperature changes and, above all, exposure extreme temperatures might induce wider cracks micro‐cracks which, turn, accelerate the diffusion corrosive agents. Motivated by this evidence, present study aims at verifying sensitivi...

PURPOSE Three-dimensional finite element analysis was conducted to evaluate and compare the stress distribution in the abutment and retention screw of implant-supported single crowns with platform switching and with a conventional platform under vertical and oblique loading. MATERIALS AND METHODS Two finite element models were created simulating an osseointegrated implant (4 × 10 mm, platform...

The aim of this study was to screen patients with fixed prosthodontic appliances that were in oral cavity for a period of 5 years or more and to assess clinically and radiologically root caries, gingival recession, pocket formation, alveolar ridge resorption, as well as gingival (GI) and plaque index (PI). The aim also was to find out the differences between materials and constructions, between...

OBJECTIVE Provisional cements are commonly used to facilitate retrievability of cement-retained fixed implant restorations; but compromised abutment preparation may affect the retention of implant-retained crowns.The purpose of this study was to investigate the effect of abutment design and type of luting agent on the retentive strength of cement-retained implant restorations. MATERIALS AND M...

a new design for replacing a missing anterior tooth is described. in this article, a lingually fixed partial denture, its advantages, disadvantages, indication and contraindications have been explained. the ability of this design to replace a single missing central or lateral incisor is discussed.