Evaluation of Setting Parameters in Virtual Articulator: In-vitro Study
Abstract: Statement of Problem: This study addressed the lack of data available on the parameters of virtual articulator settings in CAD/CAM dentistry. Purpose: The purpose of this study was to evaluate the effects on maxillomandibular casts of different virtual articulator settings parameters in the Exocad software (anterior guide pin, condylar guide inclination, and Bennett angle). Materials and... read moreMethods: Maxillary and mandibular stone occlusal rims were mounted arbitrarily in a CPR semi-adjustable artex articulator using mounting stone. The occlusal rims were scanned, fixed in scan fixatorset, Artex, and then scanned again using an extraoral scanner. Next, the scanned casts were mounted in a virtual semi adjustable, Type A articulator in Exocad. The mounted models were evaluated with three different settings (N = 10): the incisal guide pin, condylar inclination, and Bennett angle. The incisal guide pin was evaluated at 0, 1, 2, and 3 mm, the condylar inclination at 0, 10, 20, 30, 40, and 50 degrees, and the Bennett angle at 0, 10, 20, and 30 degrees; Exocad was used to measure the distances in mm and the angles in degrees. The data were analyzed with SPSS v. 24 in which descriptive statistics (means and standard deviations) and 95% confidence intervals were calculated for each condition; the results were displayed graphically in error bar charts. Results: In incisal guide pin group, the space between the maxillary and mandibular casts increased with increased values of the anterior guide pin, and the 3 mm opening had the highest mean value compared to other conditions. In condylar inclination, the space between the maxillary and mandibular casts also increased with an increased condylar inclination angle, as did the Bennett angle between the laterotrusive condylar path and sagittal plane of the right and left condyles. Conclusions: Within the limitations of this in-vitro study, the anterior and posterior space between maxillary and mandibular master casts increased as the anterior guide pin value increased. The condylar inclination angle affected protrusive movements, and thus, increases in condylar inclination will affect posterior separation between maxillary and mandibular master casts in protrusive movement. A change in the Bennett angle had a similar effect on the medial wall of the condylar path of the virtual semi adjustable articulator, which functions differently in Exocad to the conventional semi adjustable articulator. Keywords:,,, digital articulator,,,
Thesis (M.S.)--Tufts University, 2018.
Submitted to the Dept. of Posthodontics.
Advisor: Ala Ali.
Committee: Matthew Finkelman, Vasiliki Tsakalelli, and Marcelo Suzuki.
Keyword: Dentistry.read less