Regenerated Bone Pattern Around Exposed Implants with Various Designs.

Purpose: The design and surface features of dental implants substantially affect the healing and remodeling of adjacent bones. This study aimed to investigate the impact of design and surface on bone regeneration using implants of two different pitches, each with three different surface features.

Materials And Methods: Custom-manufactured titanium implants (length, 10 mm; diameter, 3.

A Long-Term Prospective Evaluation of Marginal Bone Level Change Around Different Implant Systems.

Purpose: The purpose of this prospective study was to assess the change of marginal bone level around three different types of external-hex implants after 5 years using radiography.

Materials And Methods: Included in this study were 54 patients randomly put into three different groups; rough-surface implants (Brånemark), machined coronal aspect implants (Restore), and microthreaded coronal aspect implants (Hexplant). Clinical and radiographic assessments were performed contemporaneously with implant loading (baseline) and at 1, 3, and 5 years post-functional loading.

A novel coping design to decrease maximum principal stress in zirconia ceramic restorations.

Purpose: The objective of this study was to evaluate the influence of coping design modifications on maximum first principal stress (MPS) in a mathematical zirconia ceramic crown model.

Materials And Methods: For a nonlinear, 3D finite element analysis, a simplified tooth model was built on the basis of the average dimensions of mandibular second molars. Virtual tooth reduction was performed to model an abutment with a flat occlusal surface and 16° convergence angle between facing walls.

The effect of ultraviolet-C irradiation via a bactericidal ultraviolet sterilizer on an anodized titanium implant: a study in rabbits.

Purpose: After placement, titanium dental implants are conditioned by blood and tissue fluid. These initial processes are affected by the hydrophilicity of the implant. The hydrophilicity of titanium dioxide (TiO2) can be increased by ultraviolet (UV)-C irradiation.

Bone regeneration with rabbit bone marrow-derived mesenchymal stem cells and bone graft materials.

Purpose: This study compared the bone regeneration response of different bone graft materials inside canals within anodized titanium implants in cortical and cancellous bone.

Materials And Methods: Upper and lower transverse canals were created in anodic oxidized-surface titanium implants to serve as sites for cortical and cancellous bone regeneration, respectively. The canals were filled with bone graft materials--rabbit bone marrow--derived mesenchymal stem cells and platelet-rich plasma, xenograft, or alloplast (micromacroporous biphasic calcium phosphate)-or left empty (as a control).

Influence of internal-gap width and cement type on the retentive force of zirconia copings in pullout testing.

Objectives: The purpose of this study was to evaluate the influence of internal-gap width and cement type on the retentive force of zirconia copings.

Methods: A CAD/CAM system was used to mill 48 identical abutments on extracted human molars and fabricate 48 zirconia copings. The internal-gap width for cement was set to 40 μm or 160 μm (n=24 each).

Effects of laser irradiation on machined and anodized titanium disks.

Purpose: Although the laser has become one of the most commonly used tools for implant dentistry, research is lacking on whether or not the laser causes any changes on the surface of titanium (Ti) implants. The present study analyzed the morphology, composition, crystal structure, and surface roughness changes of machined and anodized Ti surfaces, irradiated with erbium chromium-doped yttrium-scandium-gallium-garnet (Er,Cr:YSGG), erbium-doped yttrium-aluminum-garnet (Er:YAG), and carbon dioxide (CO2) lasers.

Materials And Methods: Seventy-two Ti disks were fabricated by machining commercially pure Ti (grade 3); 36 of them were anodized at 300 V.

Influence of cement thickness on resin-zirconia microtensile bond strength.

Purpose: The aim of this study was to evaluate the influence of resin cement thickness on the microtensile bond strength between zirconium-oxide ceramic and resin cement.

Materials And Methods: Thirty-two freshly extracted molars were transversely sectioned at the deep dentin level and bonded to air-abraded zirconium oxide ceramic disks. The specimens were divided into 8 groups based on the experimental conditions (cement type: Rely X UniCem or Panavia F 2.

Accuracy of implant impressions without impression copings: a three-dimensional analysis.

Statement Of Problem: Implant impressions without impression copings can be used for cement-retained implant restorations. A comparison of the accuracy of implant impressions with and without impression copings is needed.

Purpose: The purpose of this study was to evaluate and compare the dimensional accuracy of implant definitive casts that are fabricated by implant impressions with and without impression copings.

The level of buccal gingival margin around single and two adjacent implant restorations: a preliminary result.

Statement Of Problem: Little information is available about the buccal gingival level of multiple implant restorations.

Purpose: This study was aimed to evaluate the relationship between width and height of buccal soft tissue around single and 2 adjacent implant restorations.

Material And Methods: Four implant restoration groups (first and second molars, single second molars, posterior single restorations between teeth, and anterior single restorations between teeth) were randomly chosen from one dental institute.

The microtomographic evaluation of marginal bone resorption of immediately loaded scalloped design implant with various microthread configurations in canine mandible: pilot study.

This study was undertaken to evaluate the effect of microthread geometry of scalloped design implant on marginal bone resorption. Four types of scalloped design titanium implant specimens were prepared. The type 1 implant had a machined scalloped collar, type 2 had a sandblasted and acid-etched scalloped collar, type 3 had horizontal microthreads, and type 4 had parabolic microthreads, which are parallel with the scalloped conical margin.

Influence of transmucosal designs of three one-piece implant systems on early tissue responses: a histometric study in beagle dogs.

Purpose: The purpose of this study was to investigate the early tissue response around three one-piece implant systems with different transmucosal designs.

Materials And Methods: Three one-piece dental implant systems with different profiles and surface roughnesses on the transmucosal portion were examined in the current study. The transmucosal portions were flared and machined (FM), concave and machined with microgrooves (CMG), or straight and anodic oxidized (SA).

Healing response of cortical and cancellous bone around titanium implants.

Purpose: The purpose of this study was to evaluate differences in the healing of cortical and cancellous bone around titanium implants with two different surfaces (machined or anodized) in rabbit tibiae.

Materials And Methods: Screw-shaped commercially pure titanium implants of two different surface types were fabricated: machined implants (control) and anodized implants; each had two transverse canals that served as sites for bone ingrowth. In the tibiae of six New Zealand white rabbits, a total of 24 implants (12 implants of each surface) were surgically placed in a randomized arrangement.

The change of rotational freedom following different insertion torques in three implant systems with implant driver.

Statement Of Problem: Implant drivers are getting popular in clinical dentistry. Unlike to implant systems with external hex connection, implant drivers directly engage the implant/abutment interface. The deformation of the implant/abutment interface can be introduced while placing an implant with its implant driver in clinical situations.

Osseointegration of anodized titanium implants coated with fibroblast growth factor-fibronectin (FGF-FN) fusion protein.

Purpose: The synergistic effect of fibroblast growth factor (FGF) and human fibronectin fragment (hFNIII9-10) on osteoblast cell adhesion has been demonstrated in vitro. The purpose of this study was to evaluate the bone response around anodized titanium implants treated with FGF-FN fusion protein using the histomorphometric analysis and the removal torque test.

Materials And Methods: Threaded implants were manufactured by machining a commercially pure titanium (grade 4).

Radiographic evaluation of marginal bone level around implants with different neck designs after 1 year.

Purpose: To evaluate the influence of macro- and microstructure of the implant surface at the marginal bone level after functional loading.

Materials And Methods: Sixty-eight patients were randomly assigned to 1 of 3 groups. The first group received 35 implants with a machined neck (Ankylos); the second group, 34 implants with a rough-surfaced neck (Stage 1); and the third, 38 implants with a rough-surfaced neck with microthreads (Oneplant).

Displacement of implant components from impressions to definitive casts.

Purpose: Four possible displacements of implant components from a patient model to a definitive cast were assessed to suggest a standard method of comparing the accuracies of implant impression techniques.

Materials And Methods: Two techniques for impression making were assessed: a nonsplinted open-tray technique and a light-curing resin splinted open-tray technique. A mandibular model with 5 parallel implants was fabricated.

Influence of implant abutment type on stress distribution in bone under various loading conditions using finite element analysis.

Purpose: The purpose of this study was to investigate the effect of 3 different abutment types on the stress distribution in bone with inclined loads using finite element analysis.

Materials And Methods: The 1-body, internal-hex, and external-hex implant systems were modeled to study the effect of abutment type on stress distribution in bone. The bone model used in this study comprised compact and spongious bone assumed to be homogeneous, isotropic, and linearly elastic.

The effects of ion beam-assisted deposition of hydroxyapatite on the grit-blasted surface of endosseous implants in rabbit tibiae.

Purpose: This study was undertaken to evaluate ion beam-assisted deposition (IBAD) of hydroxyapatite (HA) on the grit-blasted surface of endosseous dental implants 6 weeks postplacement.

Materials And Methods: A total of 40 implants was placed in the tibiae of 10 New Zealand white rabbits. Twenty implants were grit-blasted only and the other 20 were grit-blasted and coated with HA by the IBAD method.

Development and evaluation of digital subtraction radiography computer program.

Objective: We developed a new program for digital subtraction radiography (DSR) having useful functions to get the DSR image more accurately and efficiently. The purpose of this study was to evaluate the accuracy of the DSR image acquired using the new program as compared with the ready-made program.

Study Design: Four observers performed the DSR process using our program and the ready-made program for digital intraoral radiographs taken from incisor, premolar, and molar regions.

Fractal analysis of mandibular bony healing after orthognathic surgery.

Objectives: We evaluated the radiographic changes to the operational sites after orthognathic surgery by using fractal analysis.

Study Design: Panoramic radiographs from 35 patients who underwent orthognathic surgery on the mandible without any complications during the osseous healing process were selected. The radiographs taken before the operation (stage 0) and 1 or 2 days (stage 1), 1 month (stage 2), 6 months (stage 3), and 12 months (stage 4) after the operation were digitized at 600 dpi with 256 gray levels.

Biological performance of calcium phosphate films formed on commercially pure Ti by electron-beam evaporation.

Thin and defect-free calcium phosphate films with a Ca/P ratio of 1.62 were formed by electron-beam evaporation. The as-deposited films had average bonding strengths to the metal implants of 64.