PMC3571521_01
Diamond CVD burs of different shapes and sizes.
DENT-7-128-g2.jpg
PMC3571521_01_DENT-7-128-g2.jpg
f2-dent7_p0127
In the clinical case number 1 (Figure 3), esthetic deficiencies and secondary caries, detected by a previous bite-wing radiographic exam were the reasons for replacement of the amalgam restorations with resin composite.
Clinical Case - Initial picture.
DENT-7-129-g3.jpg
PMC3571521_01_DENT-7-129-g3.jpg
f3-dent7_p0127
The removal of the amalgam restorations in a maxillary pre-molar and first molar was carried out using a CVD bur (cylindrical shaped point - Figure 4).
Cylindrical shaped CVD bur used for the removal of the amalgam restoration.
DENT-7-129-g4.jpg
PMC3571521_01_DENT-7-129-g4.jpg
f4-dent7_p0127
The adjacent tooth and soft tissue were protected by a plastic matrix, and not harmed by the CVD bur (Figure 5).
Plastic matrix positioned to protect soft tissue and the adjacent tooth.
DENT-7-129-g5.jpg
PMC3571521_01_DENT-7-129-g5.jpg
f5-dent7_p0127
This offers minimal risks of pulp damage, and makes the visibility of the operation field better requiring less frequent interruption during the procedure (Figure 6).
Clinical aspect after cavity preparation.
DENT-7-129-g6.jpg
PMC3571521_01_DENT-7-129-g6.jpg
f6-dent7_p0127
The authors present SEM images obtained in an in vitro previous study that demonstrated a typical cutting pattern that is expected to be seen in the prepared surfaces when working with CVD burs (Figure 7).
SEM Image of the prepared dentin surface.
DENT-7-129-g7.jpg
PMC3571521_01_DENT-7-129-g7.jpg
f7-dent7_p0127
The AFM obtained a three-dimensional image that illustrates the typical dentin surface that should be expected when working with this particular instrument (Figure 8).
AFM Image of the prepared dentin surface.
DENT-7-129-g8.jpg
PMC3571521_01_DENT-7-129-g8.jpg
f8-dent7_p0127
The qualitative results of the prepared dentin surface investigated in SEM and AFM, corroborates with other authors who have stated that CVD burs produce a characteristic dentin surface, where a thin smear layer is detected (Figure 9).
SEM Image of the obtained smear layer.
DENT-7-130-g9.jpg
PMC3571521_01_DENT-7-130-g9.jpg
f9-dent7_p0127
The curing light used was a LED (Light Emitting Diode - Radii - SDI) with 1400 mW/cm2 for 40 seconds (Figure 10), and the composite resin (4 Seasons - Ivoclar Vivadent - shade A2) was inserted in oblique increments.
Light-Curing
DENT-7-130-g10.jpg
PMC3571521_01_DENT-7-130-g10.jpg
f10-dent7_p0127
AFM image of the surface of a polymerized 4 Seasons dental composite, when a glycerin gel is used, is presented in Figure 11. After light curing, the rubber dam was removed and occlusion checked.
AFM Image of the polymerized resin surface layer.
DENT-7-130-g11.jpg
PMC3571521_01_DENT-7-130-g11.jpg
f11-dent7_p0127
The restoration was polished with enhance silicone abrasive points followed by a felt disk, to achieve an excellent final result (Figure 12).