Evaluation of artificial teeth color using spectrophotometer, 2014
Introduction: Artificial teeth used for removable prostheses frequently do not harmonize with the... more Introduction: Artificial teeth used for removable prostheses frequently do not harmonize with the color of natural teeth in partial denture wearers, leading to unpleasant esthetics. Accordingly, the aim of this study was to evaluate the validity of artificial teeth color, as supplied by the manufacturer, using a clinical spectrophotometer. Materials and methods: The VITA Easyshade Advance clinical spectrophotometer was used in the comparison mode to evaluate the color of 6 randomly selected artificial teeth sets (Vivodent Orthotype DCL by Ivoclar vivadent: A1, A2, A3, B3, C2, and D3). Results were analyzed using IBM SPSS software package version 20.0. Results: The results indicated that the color of the selected shades did not vary from those standard colors set in the device manufactured by a different company. Conclusion: Within the limitations of the present study, the coefficient of variation, of artificial teeth colors from standard color dimensions set in the clinical spectrophotometer, was not high, and such teeth colors are clinically acceptable and reliable.
In this paper, numerical methods are used to build a three-dimensional (3D) model for human mandi... more In this paper, numerical methods are used to build a three-dimensional (3D) model for human mandible with multi-objects from two-dimensional (2D) images captured by computed tomography (CT) scanner device. Three steps are used to evaluate realistic model; First step, segmentation techniques; are used to eliminate the undesired tissues, Second step, multi-object reconstruction technique; are used to evaluate both mandible bones and teeth, final step, texture models are generated. The output models are validated in comparison with the actual 3D model, which are generated by the CT scanner; they are meshed by tetrahedral elements to prepare the geometry for the finite elements analysis (FEA). Preliminary results are obtained for intensity measurements of teeth are presented.
Tissue engineering in the head and neck area, presents numerous advantages. One of the most remar... more Tissue engineering in the head and neck area, presents numerous advantages. One of the most remarkable advantages is that regeneration of only a small amount of tissue can be highly beneficial to the patient, particularly in the field of periodontal tissue regeneration. For decades, successful osseointegration has provided thousands of restorations that maintain normal function. With the increasing need to utilize dental implants for growing patients and enhance their function to simulate normal tooth physiology and proprioception, there appears to be an urgent need for the concept of periodontal tissue regeneration around dental implants. In the present work, 5 goats were used for immediate implant placement post canine teeth extraction. Each goat received 2 implant fixtures; the control side received a porous hollow root-form poly (DL-Lactide-co-Glycolide) scaffold around the titanium fixture, and the experimental side received the same scaffold but seeded with autogenous bone mar...
Introduction: This study clinically evaluated early loaded short dental implants compared to earl... more Introduction: This study clinically evaluated early loaded short dental implants compared to early long dental implants assisting mandibular Kennedy Class I implant assisted removable partial denture (IARPD) with the implants placed once at the position of the missing first molar once at the position of the missing second molar. Materials and methods: Twenty male patients, 30 to 60 years old, participated in this study and were blindly divided into 2 groups. The 10 patients of group I received one short implant placed in the mandibular right edentulous space at the site of the missing first molar, and a long implant placed in the left distal extension space at the site of the missing first molar. Group II was made of the same number of patients but with the implants placed at the sites of the missing second molars. After one year of the IARPD loading the implants were evaluated for plaque index, pocket depth, mobility, vertical bone loss, and bone density profile. Results: No signif...
— A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) s... more — A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) studies is presented in this paper. It is expected that the proposed approach will help automate different tissues regions by providing initial boundary points for deformable models or seed points for split and merge segmentation algorithms. Preliminary results obtained for dental CT studies of dentate and edentulous human-mandible are presented with finite element models divided by tetrahedral elements, which built based on actual CT data combined with triangulation equations. Identification of different anatomical regions set for mandible cortical and cancellous bones by generated 3D models by marching cubes technique. Keywords-medical imaging; tissue engineeing; 3D bone reconstruction; dental computed tomography I.
It takes a lot of training on patients for both undergraduate to develop clinical sense as regard... more It takes a lot of training on patients for both undergraduate to develop clinical sense as regards to the placement of dental implants in the jaw bones, also, the models provided by the dental implant companies for training are usually made of strengthened synthetic foams, which are far from the composition, and tactile sense provided by natural bone during drilling for clinical placement of dental implants. This is an in-vitro experimental study which utilized bovine femur bone, where the shaft of the femur provided the surface compact layer, and the head provided the cancellous bone layer, to provide a training model similar to jaw bones macroscopic anatomy. Both the compact and cancellous bone samples were characterized using mechanical compressive testing. The elastic moduli of the cancellous and cortical femur bone were comparable to those of the human mandible, and the prepared training model provided a more lifelike condition during the drilling and placement of dental implan...
Evaluation of artificial teeth color using spectrophotometer, 2014
Introduction: Artificial teeth used for removable prostheses frequently do not harmonize with the... more Introduction: Artificial teeth used for removable prostheses frequently do not harmonize with the color of natural teeth in partial denture wearers, leading to unpleasant esthetics. Accordingly, the aim of this study was to evaluate the validity of artificial teeth color, as supplied by the manufacturer, using a clinical spectrophotometer. Materials and methods: The VITA Easyshade Advance clinical spectrophotometer was used in the comparison mode to evaluate the color of 6 randomly selected artificial teeth sets (Vivodent Orthotype DCL by Ivoclar vivadent: A1, A2, A3, B3, C2, and D3). Results were analyzed using IBM SPSS software package version 20.0. Results: The results indicated that the color of the selected shades did not vary from those standard colors set in the device manufactured by a different company. Conclusion: Within the limitations of the present study, the coefficient of variation, of artificial teeth colors from standard color dimensions set in the clinical spectrophotometer, was not high, and such teeth colors are clinically acceptable and reliable.
In this paper, numerical methods are used to build a three-dimensional (3D) model for human mandi... more In this paper, numerical methods are used to build a three-dimensional (3D) model for human mandible with multi-objects from two-dimensional (2D) images captured by computed tomography (CT) scanner device. Three steps are used to evaluate realistic model; First step, segmentation techniques; are used to eliminate the undesired tissues, Second step, multi-object reconstruction technique; are used to evaluate both mandible bones and teeth, final step, texture models are generated. The output models are validated in comparison with the actual 3D model, which are generated by the CT scanner; they are meshed by tetrahedral elements to prepare the geometry for the finite elements analysis (FEA). Preliminary results are obtained for intensity measurements of teeth are presented.
Tissue engineering in the head and neck area, presents numerous advantages. One of the most remar... more Tissue engineering in the head and neck area, presents numerous advantages. One of the most remarkable advantages is that regeneration of only a small amount of tissue can be highly beneficial to the patient, particularly in the field of periodontal tissue regeneration. For decades, successful osseointegration has provided thousands of restorations that maintain normal function. With the increasing need to utilize dental implants for growing patients and enhance their function to simulate normal tooth physiology and proprioception, there appears to be an urgent need for the concept of periodontal tissue regeneration around dental implants. In the present work, 5 goats were used for immediate implant placement post canine teeth extraction. Each goat received 2 implant fixtures; the control side received a porous hollow root-form poly (DL-Lactide-co-Glycolide) scaffold around the titanium fixture, and the experimental side received the same scaffold but seeded with autogenous bone mar...
Introduction: This study clinically evaluated early loaded short dental implants compared to earl... more Introduction: This study clinically evaluated early loaded short dental implants compared to early long dental implants assisting mandibular Kennedy Class I implant assisted removable partial denture (IARPD) with the implants placed once at the position of the missing first molar once at the position of the missing second molar. Materials and methods: Twenty male patients, 30 to 60 years old, participated in this study and were blindly divided into 2 groups. The 10 patients of group I received one short implant placed in the mandibular right edentulous space at the site of the missing first molar, and a long implant placed in the left distal extension space at the site of the missing first molar. Group II was made of the same number of patients but with the implants placed at the sites of the missing second molars. After one year of the IARPD loading the implants were evaluated for plaque index, pocket depth, mobility, vertical bone loss, and bone density profile. Results: No signif...
— A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) s... more — A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) studies is presented in this paper. It is expected that the proposed approach will help automate different tissues regions by providing initial boundary points for deformable models or seed points for split and merge segmentation algorithms. Preliminary results obtained for dental CT studies of dentate and edentulous human-mandible are presented with finite element models divided by tetrahedral elements, which built based on actual CT data combined with triangulation equations. Identification of different anatomical regions set for mandible cortical and cancellous bones by generated 3D models by marching cubes technique. Keywords-medical imaging; tissue engineeing; 3D bone reconstruction; dental computed tomography I.
It takes a lot of training on patients for both undergraduate to develop clinical sense as regard... more It takes a lot of training on patients for both undergraduate to develop clinical sense as regards to the placement of dental implants in the jaw bones, also, the models provided by the dental implant companies for training are usually made of strengthened synthetic foams, which are far from the composition, and tactile sense provided by natural bone during drilling for clinical placement of dental implants. This is an in-vitro experimental study which utilized bovine femur bone, where the shaft of the femur provided the surface compact layer, and the head provided the cancellous bone layer, to provide a training model similar to jaw bones macroscopic anatomy. Both the compact and cancellous bone samples were characterized using mechanical compressive testing. The elastic moduli of the cancellous and cortical femur bone were comparable to those of the human mandible, and the prepared training model provided a more lifelike condition during the drilling and placement of dental implan...
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Papers by Dr.Mohamed Alkhodary