SEM evaluation of human gingival fibroblasts growth onto CAD/CAM zirconia and veneering ceramic for zirconia.

Aim: To evaluate the growth of Human Gingival Fibroblasts (HGFs) cultured onto sample discs of CAD/CAM zirconia and veneering ceramic for zirconia by means of Scanning Electron Microscope (SEM) analysis at different experimental times.

Methods: A total of 26 experimental discs, divided into 2 groups, were used: Group A) CAD/CAM zirconia (3Y-TZP) discs (n=13); Group B) veneering ceramic for zirconia discs (n=13). HGFs were obtained from human gingival biopsies, isolated and placed in culture plates.

Scanning electron microscopy evaluation of capsulorhexis in femtosecond laser-assisted cataract surgery.

Purpose: To use scanning electron microscopy (SEM) to evaluate capsulorhexis-cut quality obtained during femtosecond laser-assisted cataract surgery at different energy settings and evaluate whether there are differences between this technique and a standard manual technique.

Setting: Ophthalmology Clinic, Department of Medicine and Science of Ageing, University G. D'Annunzio Chieti-Pescara, Chieti, Italy.

Helicobacter pylori free-living and biofilm modes of growth: behavior in response to different culture media.

The physiological behavior of Helicobacter pylori in different growth conditions was investigated to approach its growth standardization. H. pylori free-living and biofilm modes of growth were assessed in four different liquid culture media (Brucella broth, brain heart infusion broth and Ham's F-12 supplemented with 2% fetal calf serum and Ham's F-12 without serum).

Biomechanical aspects in late implant failures: scanning electron microscopy analysis of four clinical cases.

Aim: The aim of this work is to analyze by scanning electron microscopy implant components that have mechanically failed in vivo.

Materials And Methods: Three clinical cases are presented relative to single lateral posterior restorations supported by implants and a case of a mandibular overdenture supported by two implants. In all the reported cases the presence of an incongruous occlusal load caused the fracture of the components of the implant supported restorations.

Clinical and histologic evaluation of fresh frozen human bone grafts for horizontal reconstruction of maxillary alveolar ridges.

The aims of the present study were to clinically and histologically evaluate human fresh frozen bone (FFB) grafts used to treat severe maxillary horizontal defects prior to dental implant placement. Ten patients were treated with FFB onlay grafts. Measurements using computed tomography scans were recorded preoperatively and at 5 months.

Evaluation of the friction of self-ligating and conventional bracket systems.

Objectives: This in vitro study evaluated the friction (F) generated by aligned stainless steel (SS) conventional brackets, self-ligating Damon MX(©) brackets (SDS Ormco, Glendora, California, USA), Time3(©) brackets (American Orthodontics, Sheboygan, Wisconsin, USA), Vision LP(©) brackets (American Orthodontics), and low-friction Slide(©) ligatures (Leone, Firenze, Italy) coupled with various SS, nickel-titanium (NiTi), and beta-titanium (TMA) archwires.

Methods: All brackets had a 0.022-inch slot, and the orthodontic archwires were 0.

In vitro analysis of resistance to cyclic load and preload distribution of two implant/abutment screwed connections.

The aim of the present research is an in vitro evaluation of the preload distribution in screw-retained implant systems under cyclic load. Two implant systems with internal connection were tested: fifteen 4.5 × 10 mm implants with internal hexagon and fifteen 4.

Bacterial adhesion on commercially pure titanium and anatase-coated titanium healing screws: an in vivo human study.

Background: Little is known about the mechanisms of bacterial interaction with implant materials in the oral cavity. Other surface characteristics, in addition to surface roughness, seem to be extremely important in relation to plaque formation. Different adhesion affinities of bacteria were reported for different materials.

Clinical, histologic, and histomorphometric analyses of regenerated bone in maxillary sinus augmentation using fresh frozen human bone allografts.

Background: The purpose of the present study was the clinical and the histologic evaluation of fresh frozen human bone (FFB) allografts used for maxillary sinus-augmentation procedures.

Methods: Ten subjects were treated with maxillary sinus augmentations using FFB. Radiologic measurements were recorded on computed tomography scans preoperatively and 5 months after the sinus surgeries.

Evaluation of peri-implant bone loss around platform-switched implants.

This clinical and radiographic prospective study evaluated bone loss around two-piece implants that were restored according to the platform-switching protocol. One hundred thirty-one implants were consecutively placed in 45 patients following a nonsubmerged surgical protocol. On 75 implants, a healing abutment 1 mm narrower than the implant platform was placed at the time of surgery.

Bone contact around osseointegrated implants: histologic analysis of a dual-acid-etched surface implant in a diabetic patient.

The clinical applicability and predictability of osseointegrated implants in healthy patients have been studied extensively. Although successful treatment of patients with medical conditions including diabetes, arthritis, and cardiovascular disease has been described, insufficient information is available to determine the effects of diabetes on the process of osseointegration. An implant placed and intended to support an overdenture in a 65-year-old diabetic woman was prosthetically unfavorable and was retrieved after 2 months.

Effect of margin design on the fracture resistance of Procera all ceram cores: an in vitro study.

Aim: The aim of the present in vitro study is to compare the resistance to fracture under a cyclic load applied to chamfer-edged vs. shoulder-edged Procera All Ceram cores.

Materials And Methods: An extracted first maxillary premolar was prepared with a 50 degrees chamfer margin using conventional diamond burs, and an impression was taken using a polyvinylsiloxane.

In vitro evaluation of thermomechanic coupling in conical implant-to-abutment joint.

Purpose: This study investigates the use of thermomechanic abutment-to-implant coupling.

Materials And Methods: Ten 3.5 x 1 mm commercially pure titanium Ankylos implants (Dentsply Friadent, Mannheim, Germany) and 10 standard abutment of titanium alloy Ti6Al4V were used in the present study.

In vitro evaluation of fracture resistance and failure mode of internally restored endodontically treated maxillary incisors with differing heights of residual dentin.

Statement Of Problem: Some of the associated effects of different restorative systems placed in endodontically treated teeth with varying heights of residual dentin have yet to be examined in a comprehensive manner. There is a need for additional information regarding fracture resistance and mode of failure.

Purpose: The purpose of this in vitro study was to evaluate the effect of 3 different restorative techniques with varying amounts of remaining dentin heights on the fracture resistance and failure mode of endodontically treated teeth.

An in vitro investigation of the influence of self-ligating brackets, low friction ligatures, and archwire on frictional resistance.

This study, performed using a specially designed apparatus that included 10 aligned brackets, evaluated the frictional resistance generated by conventional stainless steel (SS) brackets (Victory Series), self-ligating Damon SL II brackets, Time Plus brackets, and low-friction ligatures (Slide) coupled with various SS, nickel-titanium (NiTi), and beta-titanium (TMA) archwires. All brackets had a 0.022-inch slot and the orthodontic wire alloys were 0.

Friction of conventional and self-ligating brackets using a 10 bracket model.

The friction generated by various bracket-archwire combinations previously has been studied using in vitro testing models that included only one or three brackets. This study was performed using a specially designed apparatus that included 10 aligned brackets to compare the frictional resistance generated by conventional stainless steel brackets, self-ligating Damon SL II brackets and Time Plus brackets coupled with stainless steel, nickel-titanium and beta-titanium archwires. All brackets had a 0.

Shear bond strength, bond failure, and scanning electron microscopy analysis of a new flowable composite for orthodontic use.

A new dental flowable composite, Denfil Flow, was evaluated for the bonding of orthodontic brackets by determining its shear bond strength (SBS) and the mode of bond failure after debonding. Eighty extracted human premolars were divided into two equal groups. Metal brackets were bonded to etched enamel using a composite resin control (Transbond XT) or Denfil Flow.

Collagen fiber orientation in human peri-implant bone around immediately loaded and unloaded titanium dental implants.

Background: The main factor in determining the mechanical properties of bone is the collagen configuration.

Methods: This study investigated the birefringence in human bone around loaded and unloaded titanium dental implants to evaluate the collagen fiber orientation using circularly polarized light (CPL) and scanning electron microscopy (SEM). A total of 10 titanium dental implants, five immediately loaded and five unloaded, were used.

Quantitative evaluation of the fibrin clot extension on different implant surfaces: an in vitro study.

The aim of the present study was a quantitative evaluation of the in vitro fibrin clot extension on different implant surfaces. Forty-five disk-shaped commercially pure Grade 2 titanium samples with three different surface topographies (machined, DPS, and Plus) were used in the present study. For the quantitative evaluation of the fibrin clot, 30 specimens were used (10 per group); human whole blood was employed.