ABSTRACT
OBJECTIVES@#This study aimed to compare the effects of virtual adjustment on occlusal interferences in mandibular posterior single crown and three-unit bridge restorations by using the mandibular movement track and the movement parameters of a virtual articulator.@*METHODS@#Twenty-two participants were recruited. Digital casts of the maxillary and mandibular arches were obtained using an intraoral scanner, and the jaw registration system was used to record the data of the mandibular movement track and the movement parameters of the articulator. Four kinds of restorations with 0.3 mm occlusal interferences were designed with dental design software. In particular, single crowns were designed for teeth 44 and 46, whereas three-unit bridges were designed for teeth 44-46 and 45-47, and the corresponding natural teeth were virtually extracted. Virtual adjustment of the restorations was performed using two dynamic occlusal recordings, namely, the mandibular movement track and the movement parameters of the virtual articulator. A reverse-engineering software was used to measure the root-mean-square of the three-dimensional deviation of the occlusal surfaces between natural teeth and the adjusted restorations. The differences between the two methods of virtual-occlusion adjustment were compared and analyzed.@*RESULTS@#For the same group of restorations, the three-dimensional deviation of the mandibular movement track group were lower than those of the virtual articulator group, and the differences were statistically significant (P<0.05). For the four groups of restorations adjusted by the same method, the three-dimensional deviation of the 46-tooth single crown was the largest and the smallest three-dimensional deviation was that of the 44-tooth single crown. Statistical differences existed between the 44-tooth single crown and the other groups (P<0.05).@*CONCLUSIONS@#For the occlusal design of posterior single crown and three-unit bridge, the mandibular movement track could be a more effective approach to virtual occlusal adjustment than the movement parameters of the virtual articulator.
Subject(s)
Humans , Mouth, Edentulous , Occlusal Adjustment , Jaw Relation Record , Dental Articulators , SoftwareABSTRACT
The field of dentistry, in particular prosthodontics has seen tremendous and much sophisticated advances. The advent of intra-oral scanners, CAD/CAM and reverse engineering technologies have even further improved the quality and precision of treatment procedures. Virtual articulators are one such tools that enables dentist to overcome the limitations and drawbacks of a traditional mechanical articulator. By input of real patient data it allows the analyses of static and dynamic occlusion. The purpose of this article is to highlight the procedure and benefits of using a virtual articulator over the traditional one
ABSTRACT
Objective@#To investigate the reliability of using virtual articulator in the fabrication of zirconia crowns for tetracycline discolored teeth.@*Methods@#To treat the patient with serious tetracycline stained teeth, we use zirconia crowns to shield the stained abutment teeth. To retain the characteristics of patient′s original occlusal contacts, meanwhile, to establish a stable and evenly distributed occlusal contacts, we recorded the functional movements of the patient′s jaw before preparing the teeth and transferred this relations to a physical articulator. Afterwards, relationship of the upper and lower arches was scanned through a specified fixature. Then we can customized the fabrication of the occlusal contacts of the restorations conveniently and efficiently with virtual articulator in CAD/CAM system.@*Results@#When the final restorations were inserted , a charming smile was achieved on patient′s face with satisfactory esthetics. With the application of virtual articulator in designing process, we made evenly distributed and stable bilateral occlusal contacting spots, smooth protrusive and lateral guidance on the lingual aspects of the upper anteriors. One year follow-up, this patient was observed in good oral hygiene, and was satisfied with her esthetic and functional outcome. The soft tissue around the restorations was assessed to be healthy and no signs of inflammation.@*Conclusion@# Applying the virtual articulator kits in CAD/CAM system in designing and fabricating the function-driven restorations could be an efficient way to obtain an satisfactory long-term outcome.
ABSTRACT
Este caso clínico foi realizado com as técnicas e os conceitos mais modernos da Odontologia na atualidade, iniciado pela análise multidisciplinar do conceito Digital Smile Design, do Dr. Coachman e grande equipe, com a qual conseguimos uma análise prévia e uma previsibilidade estética com medidas exatas para o procedimento técnico. Utilizou-se o sistema sem ajuste da AmannGirbach, que combina modelos precisos, com o articulador ARTEX e o sistema CAD/CAM CERAMILL completo. O trabalho foi realizado com ZIRCÔNIA ZOLID FX, monolítica e maquiada, material de última geração que tem uma altíssima translucidez. Esse conjunto de técnicas juntas diminuem o tempo de ajuste nas peças definitivas que chegam à clínica glazeadas e prontas para serem colocadas em boca.
This case was carried out with the most modern techniques and concepts of dentistry. The multidisciplinary analysis of the concept Digital Smile Design, Dr. Coachman and great team, has provided a previous analysis and an aesthetic predictability with precise measures for the technical procedure. We used the system without adjusting the Amann-Girbach,that combines accurate models with ARTEX articulator and complete CAD CAM Ceramill system. The work was made with monolithic ZOLID FX Zirconia, super high-translucent materal. This set of techniques decreases the time of adjustment of definitive pieces that reach the clinic glazed and ready to be placed in the mouth.
Subject(s)
Humans , Female , Middle Aged , Ceramics , Computer-Aided Design , Crowns , Esthetics, Dental , Technology, Dental , ZirconiumABSTRACT
With the wide application of digital technique in dental clinic,the virtual articulator has become an important tool of CAD/CAM systems for dental labs.The presented article introduces the classification,advantages and setting parameters of the virtual articulator.The authors also comment on the current commercial products of the virtual articulators in the domestic market.