PMC4134805_01
(a) Radiographic exam showing metal-ceramic crowns (teeth 45-46) with unsatisfactory marginal sealing. (b) Metallic posts cementation followed by tooth preparation. (c)-(d) Laser phototherapy (low power laser) applied on periodontal tissues. (e) Selection of tooth color. (f) Microbial reduction using the Nd:YAG laser (1,064 nm). (g)-(h) Porcelain restoration (Zircone LAVA, 3 M/ESPE). (i)-(k) Conditioning of the porcelain inner surface using the Er:YAG laser (2,940 nm). (l) Final luting of the ceramic restoration.
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fig1
The radiographic exam was conducted and revealed two metal-ceramic crowns on both first and second right lower molars with unsatisfactory marginal sealing (Figure 1(a)). Following root canals impression of the first molar and the placement of a new metallic post, tooth preparation was conducted, leaving enough space for the ceramic crown (approximately 2 mm from antagonist tooth) (Figure 1(b)). After tooth preparation, laser phototherapy with low power laser was performed in all clinical sessions (total of six sessions) on the surrounding periodontal tissue, until the final luting of the ceramic crown was conducted (Figures 1(c), 1(d) and 2(b)). The spot area was 0.028 cm2 (Figures 1(c), 1(d)-Figure 2(b)). The laser application was made using a 320 mum diameter optical fiber (Figure 1(f)). Paul, MN, EUA) (Figures 1(g) and 1(h)) were irradiated with the Er:YAG laser (Key Laser 2, KaVo, Biberach, Germany) (Figure 2(c)) emitting photons at a wavelength of 2.94 mum. The handpiece number 2052 was used and parameters were set at 250 mJ, 10 Hz, and 2.5 W (Figures 1(i), 1(j), and 1(k)). The restorations were seated in place and hold (Figure 1(l)).
(a) Nd:YAG laser (1,064 nm): microbial reduction; low power laser (660 nm): soft tissue biomodulation; Er:YAG laser (2,940 nm): conditioning of the inner ceramic surface.
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fig2
The spot area was 0.028 cm2 (Figures 1(c), 1(d)-Figure 2(b)). The irradiation was performed using the Nd:YAG laser (Smarty A10, DEKA, Firenze, Italy) (Figure 2(a)), 1,064 nm, with the following parameters: 1.5 W, 15 Hz, and 100 mJ. Paul, MN, EUA) (Figures 1(g) and 1(h)) were irradiated with the Er:YAG laser (Key Laser 2, KaVo, Biberach, Germany) (Figure 2(c)) emitting photons at a wavelength of 2.94 mum.