Strub, "Survival rate, fracture strength and failure mode of ceramic implant abutments
after chewing simulation," Journal of Oral Rehabilitation, vol.
[r.sup.[sigma] [r.sup.[sigma] sub.c](MPa) .sub.bc] .sub.t] 25500 0.167 21.6 1.16 0.09 E(MPa) [r.sup.[epsilon] .sub.bc] 25500 1.28 Table 2: Physical and mechanical parameters of rock abutments
. [[rho].sub.r] [E.sub.r] [[mu].sub.r] (kg/[m.sup.3]) (MPa) (-) Upper abutment
2580 1750 0.32 Lower abutment
2640 8750 0.22 [f.sub.r] [c.sub.r] (-) (MPa) Upper abutment
0.55 0.20 Lower abutment
Tooth (zirconia) Abutment
(titanium) Young's modules (Pa) 2 x [10.sup.11] 9.6 x [10.sup.10] Poisson's ratio 0.3 0.3 Implant (titanium) Cancellous bone Young's modules (Pa) 9.6 x [10.sup.10] 1.37 x [10.sup.9] Poisson's ratio 0.3 0.3
The solution supports ATLANTIS abutments
for cement- and screw-retained restorations as well as the ATLANTIS Conus Abutments
custom for friction fit, removable restorations.
Dentsply Implants designs, manufactures and delivers the Atlantis abutments
, the dental technician finalises the restoration and ships it to the clinician, who installs the final restoration in the patient's mouth.
Fifty-four (18 per implant abutment
type) titanium implant analogs and prosthetic abutments
(Ti Anatomic Abutment-Straumann LLC, Esthetic Abutment-Nobel BioCare, and TiDesign-Astra Tech, Inc) were purchased from Straumann, Inc, Nobel BioCare and Astra, respectively.
This is the second part of a two-part article, and explains the techniques of making provisional restorations, such as the shell technique, the bulk technique for making a temporary restoration from scratch, or the basic technique of using the mold of the unprepared abutment
in the preoperative impression, to form the temporary restoration.
A filter material is normally provided at the interface between the impervious blanket and rock abutment
to control seepage (Widman, 1993).
height dimensional accuracy of group A showed the most inaccurate value was 1,125%, meanwhile the most accurate was 0,25%.
In short term wearers 5(26.3%) abutments
had class I gingival recession, 8(42.1%) had class II recession and 1(5.26%) had class III recession.
Although the researchers in [1-5], as well as many others [6-10], have studied and analyzed the stress conditions of bridge abutments
under the impact of temperature, live load, and creep and shrinkage, further efforts must be made to investigate the stress mechanism of abutment
cracking during construction as a result of hydration heat, the cooling effect from changes in atmospheric temperature, the shrinkage difference between the concrete of the pile cap and the abutment
body, and constraints applied by the pile foundations.
The present study encompasses petrographic, geotechnical studies of the foundation and abutment
rocks and structural geology of the surrounding area.