Lasers usage in dentistry intend to be a more efficient way to cut and coagulate in comparison with
traditional scalpel blades. The aim of this study is to evaluate the time efficiency for different
surgical procedures of diode lasers compare with the classical cutting technique. Soft tissue
modeling with this type of laser was slower, but in the whole management of these cases the
economy of time during the healing process was analyzed. In this study the Epic X (Biolase) diode
laser was used for performing three procedures: 1)gingivectomy, 2) a surgical procedure to discover
of an impacted canine and 3)a vestibuloplasty. In the gingivectomy procedure, the final impression
was possible in the same appointment, so it can be estimate a 14 days economy of time. When the
impacted canine was discovered, cutting and coagulating with laser beam create the possibility to
attach the bracket much more easy easy to the tooth, due to reduced bleeding and improved
visibility. The same advantages were also during the vestibuloplasty procedure, which enable not to
damage the mental nerve and the healing process was much quicker.
In conclusion, using the laser for different surgical procedures in dentistry offer the advantages of
better controlling the bleeding and also reducing the healing time.
Digital impressions were introduced in order to overcome some inconveniences related to
conventional impression materials.The aim of this in vitro study is to determine and evaluate the way
the abutment geometry influences the accuracy of both, digital and conventional impressions. Crown
preparations with occlusal convergence angles (0,6,10 and 20 degrees) were created from 4 resin
maxillary right incisors.Each preparation was scanned using a high resolution scanner (reference
scanner) and saved in stereolithography (STL) format. Then the prepared resin teeth were scanned
(PlanScan group) using an intraoral scanner and saved in STL format as well.A number of three
conventional polyvinyl siloxane (PVS) impressions were made from each preparation, which were
poured with Type IV dental stone and scanned using the same intraoral scanner (PVS group). All
STL files were compared using metrology software (Geomagic Studio 2013), in terms of trueness
and precision. Based on the findings in this study, it may be concluded that the accuracy of digital
impressions is superior to conventional methods, but the difference between them is not significant.
<strong>Aim of the study.</strong> Marginal fit of the all ceramic chair side CAD CAM inlays evaluation.
<strong>Materials and methods.</strong> Inlay class II standardized preparations were performed on twelve natural teeth (molars) which were adapted and fixed on a typodont. Scanning of the cavities was done (Planmeca FIT) and the milling of the inlays was realized (Planmeca Mill 40). Light body silicone (Fit Checker II, GC, Tokyo, Japan) was injected on the preparations of the typodont model, and then each of the Empress CAD inlays were seated on the abutments under finger pressure, reproducing the clinical situation of the luting process. The marginal gap between the all ceramic inlays and the cavities was measured using microscopic photos of the silicone fit checker between the inlays and the cavities in 12 points/restoration. A calibration scale and imaging computer software (Image J) were used for the measurements.
<strong>Results</strong> The values measured for the occlusal cavity (marginal occlusal) were ranged between 19.026µ and 139.669µ and the values for the vertical cavity (marginal cervical) ranged between 69.256 µ and 295.091. Marginal openings below 100μ-120μ are clinically acceptable so there where some problems regarding the cervical fit.
Conclusion</strong> Within the limits of this study there were some cases with poor cervical marginal fit. Extensive studies could be useful for more accurate evaluations.