scholarly journals DIGITAL SPECTROPHOTOMETER EVALUATION OF THE INFLUENCE OF SCREW COLOR AND ACCESS HOLE FILL ON THE COLOR OF SCREW- RETAINED IMPLANT CROWNS

2016 ◽  
Vol 62 (1) ◽  
pp. 1251-1260
Author(s):  
Sahar Abdel Wahab
Keyword(s):  
Hole Fill ◽  
Access Hole

Influences of Screw Access Hole and Mechanical Cycling on the Fracture Load of Implant-Supported Crowns

2019 ◽  
Vol 32 (5) ◽  
pp. 423-429 ◽  
Author(s):  
Luciano Rosa ◽  
Márcia Borba ◽  
Fernando Mallmann ◽  
Fernando Fornari ◽  
Alvaro Bona
Keyword(s):  
Fracture Load ◽  
Mechanical Cycling ◽  
Access Hole

Screw-Retained Implant-Supported Fixed Dental Restorations: A Rational Method to Overcome Esthetic Issues with the Screw-Access Hole

2021 ◽  
Vol 7 (4) ◽  
Author(s):  
Etienne O ◽  
◽  
Waltmann E ◽  
Serfaty R ◽  
◽  
...  
Keyword(s):  
Bacterial Contamination ◽  
Point Of View ◽  
Dental Restoration ◽  
Rational Method ◽  
Rational Analysis ◽  
Dental Restorations ◽  
Access Hole ◽  
Functional Point ◽  
New Perspective ◽  
Materials Used

Achieving both esthetics and a perfect seal of the screw-access hole in a screw-retained implant-supported fixed dental restoration is a great challenge. From a functional point of view, a perfect seal needs to be obtained to prevent bacterial contamination along the screw access canal and the occlusion shall be addressed. Such a challenging procedure has to be based on a rational analysis of the different materials used. Screw-retained zirconia-based restorations offer a new perspective for esthetic and biocompatible results. The aim of this article is to describe an easy and reproducible clinical procedure to esthetically seal the screw-access hole of screw-retained implant-supported fixed dental restorations.

Limiting the dimension of a screw-access hole with an interim screw-retained prosthesis

2015 ◽  
Vol 113 (6) ◽  
pp. 648-650 ◽  
Author(s):  
Chandur Wadhwani ◽  
Kwok-Hung Chung
Keyword(s):  
Access Hole

scholarly journals Influence of Sealing of the Screw Access Hole on the Fracture Resistance of Implant-Supported Restorations

2016 ◽  
Vol 27 (2) ◽  
pp. 148-152 ◽  
Author(s):  
Rodrigo de Paula Pereira ◽  
Cibele Oliveira de Melo Rocha ◽  
José Maurício dos Santos Nunes Reis ◽  
João Neudenir Arioli-Filho
Keyword(s):  
Fracture Resistance ◽  
Resin Composite ◽  
Filling Material ◽  
Ceramic Surface ◽  
Access Hole ◽  
Mandibular Molar ◽  
Significant Difference ◽  
Metal Ceramic ◽  
One Way Anova ◽  
Ceramic Implant

Abstract The purpose of this study was to assess the influence of sealing of the screw access hole (SAH) on the fracture resistance of metal-ceramic implant-supported restorations. UCLA abutments were used to make 30 implant-retained mandibular molar restorations and divide equally into three groups: Group SRS: screw-retained restorations with SAH sealed; Group SRNS: screw-retained restorations with SAH not sealed; Group CR: cement-retained restorations. The following protocol was adopted to restore the SAH: the ceramic surface of the SAH was air-abraded with aluminum oxide; etched with 10% hydrofluoric acid; a silane coupling agent and a bonding agent were applied; cotton pellets were used as filling material and P-60 resin composite as restoring material. The cement-retained restorations were cemented with Rely-X U100. A metal rod with a spherical tip of 6.0 mm diameter was used to apply a vertical static load, simultaneously on the buccal and lingual incline cusps, at a crosshead speed of 0.5 mm/min until the fracture of the specimens. Data were analyzed using one-way ANOVA and Dunnet test (p<0.05) for multiples comparisons. The mode of failure was evaluated by a scanning electron microscopy (SEM). No significant difference between screw-retained restorations was found. The highest mean fracture resistance values were observed with CR group. Therefore, it was shown that SAH sealing did not influence the fracture resistance of the screw-retained restorations.

Acuity of Sound Localisation: A Topography of Auditory Space. II. Pinna Cues Absent

Perception ◽  
1984 ◽  
Vol 13 (5) ◽  
pp. 601-617 ◽  
Author(s):  
Simon R Oldfield ◽  
Simon P A Parker
Keyword(s):  
White Noise ◽  
Sound Source ◽  
Normal Hearing ◽  
Auditory Space ◽  
Sound Localisation ◽  
Access Hole ◽  
The Absolute

The acuity of azimuth and elevation discrimination was measured under conditions in which the cues to localisation provided by the pinnae were removed. Four subjects localised a sound source (white noise through a speaker) which varied in position over a range of elevations (-40° to +40°) and azimuths (0° to 180°), at 10° intervals, on the left side of the head. Pinna cues were removed by the insertion of individually cast moulds in both pinnae. Each mould had an access hole to the auditory canal. The absolute and algebraic, azimuth and elevation errors were measured for all subjects at each position of the source. The variability of azimuth and elevation error was also computed. The performance of the subjects was compared to their performance under normal hearing conditions. Insertion of the pinnae moulds was found to increase substantially elevation error and the number of front/back reversals. The importance of the cues provided by the pinnae in these discriminations was thus confirmed. However, the increase in elevation error did not result in a corresponding increase in azimuth error. These findings provide support for the proposition that azimuth and elevation discrimination are coded independently.

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