Cracking of Porcelain Surfaces Arising from Abrasive Grinding with a Dental Air Turbine

Abstract

Wet abrasive grinding with a conventional dental air turbine and fine grit diamond burs has the potential to cause cracking in the four porcelain types tested. Similar abrasive grinding with smaller grit size particles does not cause similar observable cracking.

ADM guidance-Ceramics: all-ceramic multilayer interfaces in dentistry

“…Circular strain gauges (rosettes) attached to the surface accurately measure the dimensional changes during drilling. However, problems arise due to extreme local heating during drilling, which might significantly change the local stress state, and even might result in micro cracking [84]. Although planar measurements are possible along the depth of a hole this approach provides only global information on residual stresses in a plane-strain configuration parallel to the interface, and important features, such as whether or not the calculated stresses are radial, hoop or circular in nature, cannot be determined.…”

Ceramics in restorative dentistry

“…Sometimes the marginal fi t of the restorations is not wholly satisfactory because of procedural limits (preparation design) and needs to be adjusted clinically as well. Therefore, in restorative dentistry, intraoral adjustments are a routine practice for interceptive occlusal contact adjustments using dental handpieces and dental abrasive burs (Chang et al , 2011;von Fraunhofer, 1997, 1998;, 2010a, 2010b, 2010c, 2012.…”

“…Although ceramic restorations can be obtained using CAD/CAM processes, there are limitations to obtaining all the CAD data directly from the mouth to produce the full spectrum of restorations using current dental CAD/CAM systems (Miyazaki et al , 2009). The pieces must be precisely adjusted and fi nished using dental handpieces and diamond burs intraorally to give an occlusal and marginal fi t (Chang et al , 2011;Rekow and Thompson, 2007;Siegel and von Fraunhofer, 1998;Yin et al , 2001Yin et al , , 2003Yin et al , , 2004Yin et al , , 2006aYin et al , , 2007aYin et al , , 2007b.…”

The effect of standardised implantoplasty protocol on titanium surface roughness: an in-vitro study

“…A custom-made device (Figure 1a) based on previous designs 18,23 with further modifications which included a precision mobile disk stage and a pressure control lever was used. A handpiece (W&H Synea Turbine TA-98 CLED, Ignaz-Glaser-Straße, Bürmoos, Austria) was secured in an adjustable jig leading to the mobile disk stage.…”