Effect of annealing procedure on the bonding of ceramic to cobalt-chromium alloys fabricated by rapid prototyping

S00223913.gif

Publication date: Available online 23 August 2017
Source:The Journal of Prosthetic Dentistry
Author(s): Ayca Tulga
Statement of problemAn annealing procedure is a heat treatment process to improve the mechanical properties of cobalt-chromium (Co-Cr) alloys. However, information is lacking about the effect of the annealing process on the bonding ability of ceramic to Co-Cr alloys fabricated by rapid prototyping.PurposeThe purpose of this in vitro study was to evaluate the effects of the fabrication techniques and the annealing procedure on the shear bond strength of ceramic to Co-Cr alloys fabricated by different techniques.Material and methodsNinety-six cylindrical specimens (10-mm diameter, 10-mm height) made of Co-Cr alloy were prepared by casting (C), milling (M), direct process powder-bed (LaserCUSING) with and without annealing (CL+, CL), and direct metal laser sintering (DMLS) with annealing (EL+) and without annealing (EL). After the application of ceramic to the metal specimens, the metal-ceramic bond strength was assessed using a shear force test at a crosshead speed of 0.5 mm/min. Shear bond strength values were statistically analyzed by 1-way ANOVA and Tukey multiple comparison tests (α=.05).ResultsAlthough statistically significant differences were found among the 3 groups (M, 29.87 ±2.06; EL, 38.92 ±2.04; and CL+, 40.93 ±2.21; P=.002), no significant differences were found among the others (P>.05). The debonding surfaces of all specimens exhibited mixed failure mode.ConclusionsThese results showed that the direct process powder-bed method is promising in terms of metal-ceramic bonding ability. The manufacturing technique of Co-Cr alloys and the annealing process influence metal-ceramic bonding.

from #Dental via xlomafota13 on Inoreader http://ift.tt/2vc5xfk

Advertisements

A multidisciplinary approach to the management of a maxillary midline diastema: A clinical report

S00223913.gif

Publication date: Available online 23 August 2017
Source:The Journal of Prosthetic Dentistry
Author(s): Mario F. Romero, Courtney S. Babb, Christian Brenes, Fernando J. Haddock
A maxillary midline diastema (MMD) is a common complaint of dental patients. An MMD can be closed with treatment from different disciplines, including operative dentistry and orthodontics. A comprehensive smile analysis is also a necessity before beginning treatment. This article highlights the closure of a 3-mm MMD by using a combination of orthodontics and direct composite resin restorations.

from #Dental via xlomafota13 on Inoreader http://ift.tt/2vvDJhi

Safe zone in anterior mandible related to the genial tubercle for implant osteotomy in a Chinese-Malaysian population: A CBCT study

alertIcon.gif

Publication date: Available online 24 August 2017
Source:The Journal of Prosthetic Dentistry
Author(s): Yik Sze Voon, Pravinkumar G. Patil
Statement of problemThe genial tubercle is a clinically palpable landmark in the mandible and can be identified in cone beam computed tomography (CBCT). Its location can be used to measure the safe zone in the interforaminal region of the mandible. These measurements may be helpful for implant treatment planning in patients with complete edentulism.PurposeThe purpose of this clinical study was to evaluate the safe distance in the interforaminal region of the mandible measured from the genial tubercle level for implant osteotomy in a Chinese-Malaysian population.Material and methodsA total of 201 Digital Imaging and Communications in Medicine (DICOM) files were selected for the study from the CBCTs of dentate or edentulous Chinese-Malaysian adult patients with ongoing or completed treatments. Measurements were made with implant planning software. The anatomy of the whole mandible was assessed in the coronal cross-sectional, horizontal view and in panoramic view. Measurements were obtained in millimeters on one side by locating and marking a genial tubercle and then marking the mesial margin of the mental foramen and the anterior loop of the inferior alveolar nerve. The corresponding points of these landmarks were identified on the crest of the mandibular ridge to measure the linear distances. All the measurement steps were repeated on the other side. The linear distance of 2 mm was deducted from the total distance between the genial tubercle and the anterior loop separately for left and right side measurements to identify the safe zone. The mixed 2-way analysis of variance (ANOVA) test was used to analyze side and sex-related variations.ResultsThe mean safe zone measured at the crestal level from the genial tubercle site on the left side of the mandible was 21.12 mm and 21.67 mm on the right side. A statistically significant (P<.05) difference was found between the left and right sides of the safe zone measurements in both men and women. No statistically significant differences were found in the safe zone between men and women on either the left or right side (P=.655). The minimum distance from the genial tubercle to the right side safe zone in women was 12.82 mm and 14.99 mm in men; however, on the left side, the minimum distance was observed to be 14.81 mm in women and 15.54 mm in men.ConclusionsThe safe zone related to the genial tubercle was 21.12 mm on the left side and 21.67 mm on the right side, with no significant sex-related variations. Within the same individuals, a significant difference was found in the safe zone between the left and right side.

from #Dental via xlomafota13 on Inoreader http://ift.tt/2vverQh

Pre-hospital Emergency Medicine at a Glance

1118829921.jpg rsstrack.gif?Section=RSS_WILEY2_MED&Page  

Pre-hospital Emergency Medicine at a Glance offers healthcare students and trainees the essential theoretical knowledge and practical skills relevant to the provision of immediate care outside of the hospital. This concise text provides information on the principles of managing acutely unwell patients with life-threatening injuries at the scene of their accident, all in highly-illustrated double-page spreads to help explain key messages.

Read More…

from #Dental via xlomafota13 on Inoreader http://ift.tt/2vmWWSX

Pre-Hospital Paediatric Life Support: The Practical Approach, 3rd Edition

1118339762.jpg rsstrack.gif?Section=RSS_WILEY2_MED&Page  

This practical book, written especially for pre-hospital staff, provides all the information needed to deal with children in life threatening situations before arriving at hospital. Complementing the best-selling Advanced Paediatric Life Support, this new edition reflects recent developments in practice, and covers the indispensable knowledge required for paediatric emergency care in the pre-hospital setting.

Read More…

from #Dental via xlomafota13 on Inoreader http://ift.tt/2wMoDZ2