Displacement comparison of CAD-CAM titanium and zirconia abutments to implants with different conical connections.

Purpose: To compare the displacements of CAD-CAM zirconia and titanium abutments into different internal connection systems after torquing.

Methods: OsseoSpeed EV and OsseoSpeed TX implants (n=10) were placed in resin blocks. Zirconia and titanium abutments (n=5) were first hand tightened and then tightened to the recommended torque (20Ncm for TX and 25Ncm for EV).

Comparison of 3D displacements of screw-retained zirconia implant crowns into implants with different internal connections with respect to screw tightening.

Statement Of Problem: Internal conical implant-abutment connections without horizontal platforms may lead to crown displacement during screw tightening and torque application. This displacement may affect the proximal contacts and occlusion of the definitive prosthesis.

Purpose: The purpose of this in vitro study was to evaluate the displacement of custom screw-retained zirconia single crowns into a recently introduced internal conical seal implant-abutment connection in 3D during hand and torque driver screw tightening.

Strain analysis of 9 different abutments for cement-retained crowns on an internal hexagonal implant.

Statement Of Problem: Many aftermarket abutments for cement-retained crowns are available for the tapered screw-vent implant. Aftermarket abutments vary widely, from stock to custom abutments and in materials such as zirconia, titanium, or a combination of the two. How these aftermarket abutments perform under occlusal loads with regard to strain distribution is not clear.

Load to failure of different zirconia implant abutments with titanium components.

Statement Of Problem: Abutments with a zirconia superstructure and a titanium insert have recently become popular. Although they have been tested under static load, their performance under simulated mastication is not well known.

Purpose: The purpose of this in vitro study was to compare the cyclic load to failure of 3 types of zirconia abutments with different mechanisms of retention of the zirconia to the titanium interface.

Split-Mouth Comparison of Splinted and Nonsplinted Prostheses on Short Implants: 3-Year Results.

Purpose: To compare splinted and individual restorations supported by short implants featuring an internal connection utilizing a split-mouth design.

Materials And Methods: Splinted and nonsplinted implant crowns were prospectively compared in 18 patients. After verifying the need for at least two consecutive implants bilaterally, computed tomography scans were made, virtual planning was done, and qualifying patients were enrolled.

Displacement of Implant Abutments Following Initial and Repeated Torqueing.

Purpose: To measure and compare the three-dimensional (3D) position of nine different abutments manufactured by different manufacturers after repeated torqueing on an internal-hexagon implant.

Materials And Methods: Nine tapered implants were placed into an acrylic resin block. Five specimens each of nine different abutments (n = 45) were placed into one of nine implants.

Three-Dimensional Displacement of Nine Different Abutments for an Implant with an Internal Hexagon Platform.

Purpose: Clinicians need to know whether there are any differences among the many abutment options available for restoring a particular implant. This study aims to compare nine abutments for one implant system for positional changes between hand tightening and torqueing.

Materials And Methods: Nine Tapered Screw-Vent (TSV) implants were placed into a resin block.

Load to failure of different titanium abutments for an internal hexagon implant.

Statement Of Problem: Several aftermarket abutments are available for a commonly used internal hexagonal connection implant. However, their load to failure performance is unknown when compared with the manufacturer's abutment.

Purpose: The purpose of this in vitro study was to conduct a load to failure comparison of 5 different titanium abutments (manufacturer's and aftermarket) for cement-retained restorations used on an implant with an internal hexagon connection.

Load to failure of different zirconia abutments for an internal hexagon implant.

Statement Of Problem: Various zirconia abutment designs are available to restore implant systems. Fracture resistance is one of the criteria involved in selecting among these options.

Purpose: The purpose of this in vitro study was to measure and compare load to failure for 5 zirconia abutments for an internally hexagon implant.

Displacement of screw-retained splinted and nonsplinted restorations into implants with conical internal connections.

Purpose: Variable abutment displacement could potentially affect proximal contacts, incisal edge position, or occlusion of implant-supported prostheses. This study aimed to measure and compare displacements of splinted and nonsplinted restorations into implants featuring internal conical connections as screws were tightened by hand or by torque driver.

Materials And Methods: A stereolithic resin model was printed using computed tomography data from a patient missing mandibular left first and second molars.

Displacement of screw-retained single crowns into implants with conical internal connections.

Purpose: Internal conical implant-abutment connections without platforms may lead to axial displacement of crowns during screw tightening. This displacement may affect proximal contacts, incisal edge position, or occlusion. This study aimed to measure the displacement of screw-retained single crowns into an implant in three dimensions during screw tightening by hand or via torque driver.

Strain comparisons for splinted and nonsplinted cement-retained implant crowns.

The aim of this study was to compare strains generated by splinted and nonsplinted cement-retained implant crowns for two implants. A stereolithic resin cast was printed using computed tomography scan data from a patient. Two 4 × 6-mm implants were placed in the posterior left side of the cast.

Split-mouth comparison of the accuracy of computer-generated and conventional surgical guides.

Purpose: Recent clinical studies have shown that implant placement is highly predictable with computer-generated surgical guides; however, the reliability of these guides has not been compared to that of conventional guides clinically. This study aimed to compare the accuracy of reproducing planned implant positions with computer-generated and conventional surgical guides using a split-mouth design.

Materials And Methods: Ten patients received two implants each in symmetric locations.

A prospective clinical study to evaluate early success of short implants.

Purpose: Short implants are an alternative to bone augmentation procedures for patients with reduced bone height. This study evaluated the success of short implants in posterior locations prior to loading.

Materials And Methods: Eighteen patients received at least four Astra Tech implants in symmetric posterior locations.

Three-dimensional image correlation analyses for strains generated by cement and screw-retained implant prostheses.

Purpose: This study aimed to measure and compare strains generated by splinted implant crowns retained by cement or screws for two implants with applied load.

Materials And Methods: A stereolithic resin model was printed using computed tomography data from a patient missing all mandibular molar teeth. Two 4 × 6 mm implants were consecutively placed in the left side.

Comparison of strains for splinted and nonsplinted screw-retained prostheses on short implants.

Purpose: Because the evidence regarding the efficacy of splinting short implants on strain distribution is limited, this study aimed to measure and compare the strains generated by splinted and nonsplinted screw-retained implant crowns for short implants with internal connections.

Material And Methods: Computed tomographic scan data of a patient missing all mandibular molar teeth were digitized using a software program, and stereolithography was then used to produce an acrylic resin cast. Two 4- x 6-mm implants were placed in the left side.

Comparison of strains for splinted and nonsplinted implant prostheses using three-dimensional image correlation.

Purpose: This study aimed to analyze and compare strain distribution patterns for splinted and nonsplinted restorations for dental implants with an internal conical connection.

Materials And Methods: Two stereolithic acrylic resin models were created using computed tomographic scan data from a patient missing all mandibular molar teeth. Two implants were placed in the right side of two mandibular models using a computer-generated surgical guide and appropriate protocol.

Bond strengths of one- and two-step self-etch adhesive systems.

Statement Of Problem: One-bottle self-etching adhesives have been introduced that combine the etchant, primer, and adhesive into a single bottle in an effort to reduce the number of bonding steps. Limited research has been conducted comparing the efficacy of 1-bottle and 2-bottle self-etching adhesives.

Purpose: This investigation evaluated the microtensile bond strength (MTBS) of 3 one-step self-etching adhesives, 2 two-step self-etching adhesives, and a total-etch adhesive.

Influence of bond quality on failure load of leucite- and lithia disilicate-based ceramics.

Statement Of Problem: The long-term survival of bonded ceramic restorations for posterior teeth is a clinical concern. The durability of the bond between the ceramic and dentin during clinical service is a factor in the load-bearing capacity of the restoration.

Purpose: This study aimed to evaluate the effect of interfacial bonding quality on the interface failure initiation loads of 2 all-ceramic systems.

Influence of interface surface conditions on indentation failure of simulated bonded ceramic onlays.

Objective: This study aims to evaluate the influence of surface roughness and acid etching on interfacial failure load and fracture initiation site for simulated resin bonded ceramic restorations.

Methods: Layered disks were fabricated using soda lime glass to simulate porcelain and fiberglass to represent dentin. These materials were selected due to their approximate elastic modulus to porcelain or dentin.

Comparison of strains produced by titanium and poly D, L-lactide Acid plating systems to in vitro forces.

Purpose: To determine if a specific resorbable plating system provides similar fixation, in terms of strain distribution under load, to a titanium system when the Champy technique is applied for the treatment of a mandibular angle fracture.

Materials And Methods: A formalin-fixed cadaver mandible was harvested just before the study. A bicortical osteotomy was then made using a diamond disc extending in an oblique direction in the area of the angle.

Microtensile bond strengths of one-step and self-etching adhesive systems.

The microtensile bond strength of resin composite bonded to human enamel was evaluated utilizing four light-cure bonding agents. Human third molars were embedded in auto-cure acrylic and the buccal surfaces were sequentially abraded to 400 grit. Resin composite cylinders were then bonded using the four bonding systems according to the manufacturer's specifications.

Relative wear of flowable and highly filled composite.

Statement Of Problem: By decreasing the proportion of filler, flowable composites are easy to adapt to small cavity preparations. However, the wear resistance of flowable composites is a clinical concern, as improved wear has been related to increased filler percentage.

Purpose: The purpose of this study was to compare wear for flowable composites and comparable heavily filled materials.

Hardness and degree of conversion of posterior packable composites.

Knoop microhardness and the degree of conversion of three packable composites (SureFil, Alert and Solitaire), a microfil composite (Heliomolar), a microhybrid composite (Herculite) and an indirect laboratory-processed composite (Belleglass) were evaluated as a function of distance from the irradiated surface. Cylindrical specimens (5.0 mm [diameter] x 6.

Simulated oral wear of packable composites.

Wear resistance has been a problem for the posterior application of resin composites. This study evaluated and compared the wear characteristics of two conventional and two packable composites. Opposing enamel wear was also measured.