Evaluation of biogeneric design techniques with CEREC CAD/CAM system
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PURPOSE. The aim of this study was to evaluate occlusal contacts generated by 3 different biogeneric design modes (individual (BI), copy (BC), reference (BR)) of CEREC software and to assess the designs subjectively. MATERIALS AND METHODS. Ten pairs of maxillary and mandibular casts were obtained from full dentate individuals. Gypsum cast contacts were quantified with articulating paper and digital impressions were taken. Then, all ceramic crown preparation was performed on the left first molar teeth and digital impressions of prepared teeth were made. BI, BC, and BR crowns were designed. Occlusal images of designs including occlusal contacts were superimposed on the gypsum cast images and corresponding contacts were determined. Three designs were evaluated by the students. RESULTS. The results of the study revealed that there was significant difference among the number of contacts of gypsum cast and digital models (P<.05). The comparison of the percentage of virtual contacts of three crown designs which were identical to the contacts of original gypsum cast revealed that BI and BR designs showed significantly higher percentages of identical contacts compared with BC design (P<.05). Subjective assessment revealed that students generally found BI designs and BR designs natural regarding naturalness of fissure morphology and cusp shape and cusp tip position. For general occlusal morphology, student groups generally found BI design “too strong” or “perfect”, BC design ”too weak”, and BR design “perfect”. CONCLUSION. On a prepared tooth, three different biogeneric design modes of a CAD/CAM software reveals different crown designs regarding occlusal contacts and morphology.
Abstract
PURPOSE. The aim of this study was to evaluate occlusal contacts generated by 3 different biogeneric design modes (individual (BI), copy (BC), reference (BR)) of CEREC software and to assess the designs subjectively. MATERIALS AND METHODS. Ten pairs of maxillary and mandibular casts were obtained from full dentate individuals. Gypsum cast contacts were quantified with articulating paper and digital impressions were taken. Then, all ceramic crown preparation was performed on the left first molar teeth and digital impressions of prepared teeth were made. BI, BC, and BR crowns were designed. Occlusal images of designs including occlusal contacts were superimposed on the gypsum cast images and corresponding contacts were determined. Three designs were evaluated by the students. RESULTS. The results of the study revealed that there was significant difference among the number of contacts of gypsum cast and digital models (P<.05). The comparison of the percentage of virtual contacts of three crown designs which were identical to the contacts of original gypsum cast revealed that BI and BR designs showed significantly higher percentages of identical contacts compared with BC design (P<.05). Subjective assessment revealed that students generally found BI designs and BR designs natural regarding naturalness of fissure morphology and cusp shape and cusp tip position. For general occlusal morphology, student groups generally found BI design “too strong” or “perfect”, BC design ”too weak”, and BR design “perfect”. CONCLUSION. On a prepared tooth, three different biogeneric design modes of a CAD/CAM software reveals different crown designs regarding occlusal contacts and morphology.
참고문헌 (19)
- Ender A, "Efficiency of a mathematical model in generating CAD", CAM-partial crowns with natural tooth morphology, 2011, pp.15, 283~289
- Kollmuss M, "Comparison of biogenerically reconstructed and waxedup complete occlusal surfaces with respect to the original tooth morphology", Clin Oral Investig, 17, pp.851~857 (2013)
- Litzenburger AP, "Fully automatic CAD design of the occlusal morphology of partial crowns compared to dental technicians’ design", Clin Oral Investig, 17, pp.491~496 (2013)
- Mattiola A, "The computer-generated occlusion of Cerec-2 inlays and onlays", Schweiz Monatsschr Zahnmed, 105, pp.1284~1290 (1995)
- De Nisco S, "Computer-generated occlusion of Cerec2 inlays and overlays", Cad, 1996, 391~407[DOI]
- Jedynakiewicz NM, "Functionally-generated pathway theory, application and development in Cerec restorations", Int J Comput Dent, 4, pp.25~36 (2001)
- Mormann WH, "Die CEREC Computer Reconstruction Inlays, Onlays und Veneers", pp.75~97 (1989), Quintessenz
- Reich S, "The self-adjusting crown (SAC)", Int J Comput Dent, 8, pp.47~58 (2005)
- Hartung F, "Comparison of the contact surface pattern between virtual and milled Cerec 3D full-ceramic crowns", Int J Comput Dent, 9, pp.129~136 (2006)
- Türp JC, "Dental occlusion: a critical reflection on past, present and future concepts", J Oral Rehabil, 35, pp.446~453 (2008)
- Christensen GJ, "Is occlusion becoming more confusing? A plea for simplicity", J Am Dent Assoc, 135, pp.767~768 (2004)
- Nemli SK, "InLab and Cerec Connect: virtual contacts in maximum intercuspation compared with original contacts--an in vitro study", Int J Comput Dent, 15, pp.23~31 (2012)
- Miyazaki T, "A review of dental CAD", CAM: current status and future perspectives from 20 years of experience, 2009, pp.28, 44~56
- DeLong R, "Accuracy of contacts calculated from 3D images of occlusal surfaces", J Dent, 35, pp.528~534 (2007)
- Delong R, "Comparing maximum intercuspal contacts of virtual dental patients and mounted dental casts", J Prosthet Dent, 88, pp.622~630 (2002)
- Schenk O, "Biogeneric-another step closer to nature. V3.8:largest update since introduction of the 3D software", Int J Comput Dent, 13, pp.169~174 (2010)
- Akgungor G, "Anterior single laminate veneer restoration using CEREC biogeneric reference design mode: case report", Key Eng Mater, 493-4, pp.599~603 (2012)
- Akgungor G, "Simultaneous Replacement of Maxillary Central Incisors with CEREC Biogeneric Reference Technique: A Case Report", J Dent Res Dent Clin Dent Prospects, 7, pp.112~118 (2013)
- Probst FA, "CAD reconstruction using contralateral mirrored anterior teeth: a 3-dimensional metric and visual evaluation", Int J Prosthodont, 21, pp.521~523 (2008)