Dr.Mohamed Alkhodary - Academia.edu (original) (raw)
Papers by Dr.Mohamed Alkhodary
International Journal of Dental Sciences and Research
Egyptian Dental Journal /Egyptian Dental Journal, Apr 1, 2024
Introduction: Osteoblastic cell adhesion to the titanium alloy (Ti-6Al-4V) was found to improve a... more Introduction: Osteoblastic cell adhesion to the titanium alloy (Ti-6Al-4V) was found to improve as non-random repetitive surface roughness was provided, the aim of the current work was to produce 10 µm laser micro-grooves on titanium close to the size of osteoblastic cell body, and the results were verified by profilometry, and linear measurements of the scanning electron microscope images. Materials and methods: Plain titanium rods, 30 mm in length and 1.5 mm in diameter, were laser grooved using the coherent AVIA laser machine with different laser energies, and the resulting surface topographies were examined by profilometry, and the linear distance measurement tool of the scanning electron microscope for determination of the laser energy that produced an average of 10 µm groove width and depth. Results: Different surface topographies were obtained, ranging from surface melt down to specific micro-grooves of about 10 µm depth and width, which were produced with laser energy of 10 µJ. Conclusion: The current work produced 10 µm micro-grooves on the Ti-6Al-4V alloy using 10 µJ energy of ultraviolet laser.
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.
Egyptian Dental Journal /Egyptian Dental Journal, Apr 1, 2024
Introduction: Titanium alloy (Ti-6Al-4V) surface coating with the amino acid RGD peptide was foun... more Introduction: Titanium alloy (Ti-6Al-4V) surface coating with the amino acid RGD peptide was found to improves the adhesion of osteoblasts to the implant surface. This work aimed at comparing three different methods to immobilize the amino acid sequence RGD to the Ti-6Al-4V. Materials and methods: This article tested three different methods to immobilize the amino acid sequence RGD to Ti-6Al-4V implants surface, the first method used alkane phosphonic acid and maleimide as coupling factor, the second method used a simple dip-in technique and dehydration, and the third method used a collagen coating to which the RGD was linked, then the resulting coatings were tested using the Fourier Transform Infrared (FT-IR) spectroscopy, and surface binding energy. Results: The FT-IR and surface binding energy indicated the first method yielded better and stronger RGD coating. Conclusion: The titanium alloy chemical coating process of the amino acid sequence RGD was found to yield better results ac compare to the dip-in and RGD-collagen linking methods.
Acta Scientific Dental Scienecs
Egyptian Dental Journal
Introduction: CAD/CAM complete dentures were expected to provide better retention than convention... more Introduction: CAD/CAM complete dentures were expected to provide better retention than conventional dentures, the current work tested the retention of complete dentures manufactured by conventional and/or digital workflows using a clinical direct pull-out of the maxillary complete dentures. Materials and methods: Ten completely edentulous male patients participated in this study, each patient was provided with 3 dentures, a denture made with conventional techniques, then a denture made with combined conventional/digital techniques, and finally a denture made with digital techniques. Each denture was used for a period of one month, and at the end of the month, a denture pull-out retention test was conducted and the retentive forces of dentures in each group were collected, tabulated and statistically analyzed. Results: Dentures made with combined conventional/digital techniques had more retention than dentures made with conventional techniques, and both had more retention than dentures made with digital techniques. Conclusion: Combination of the conventional and digital workflows produced maxillary dentures with higher retention than those produced from conventional or digital workflows alone.
Egyptian Dental Journal
Introduction: The accuracy of different scanning techniques and intra-oral scan bodies (ISBs) in ... more Introduction: The accuracy of different scanning techniques and intra-oral scan bodies (ISBs) in allocating the position of dental implants in complete overdenture digital impression has been questioned, this work compared it to conventional impression in situation where 4 parallel implants were used to simulate implant-supported overdenture situations in an in-vitro setting. Materials and methods: A conventional and digital impressions using ISBs and 5 different scanning techniques were made of a study model having 4 parallel implants at teeth sites 36, 33, 43, and 46 which were designated as A, B, C, and D respectively. The resulting stone cast and digital impressions virtual casts were compared for linear deviations between the implant sites using a digital caliper versus computerized measurements, and for surface mismatching using a computerized superimposition process of the stone model scan and virtual models. The linear deviations measurements were statistically analyzed using the paired t test, and the horizontal deviations were statistically analyzed using the Kruskal Wallis test. Results: Comparison of the linear measurements on the stone cast and virtual models detected significant differences in the second and third sextants of the dental arch with techniques I and IV, while superimposition horizontal deviations detected significant differences at implant positions C and D also in techniques I and IV. Conclusions: Virtual models generated from full arch digital impressions using scan bodies and scanning techniques II, III, and V had similar accuracy to stone models developed from conventional elastomeric impressions.
Egyptian Dental Journal, 2022
Egyptian Dental Journal, 2020
Remaining teeth, attached gingiva, and eye colors present additional references for missing teeth... more Remaining teeth, attached gingiva, and eye colors present additional references for missing teeth color. 11-19 Adjacent and opposing teeth were found to have a significant color relationship. 11
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.
Advancing Nanobiomaterials and Tissue Engineering, 2013
Ramalingam/Integrated, 2012
Materials Science and Engineering: C, 2011
Titanium surfaces were designed, produced, and evaluated for levels of osseointegration into the ... more Titanium surfaces were designed, produced, and evaluated for levels of osseointegration into the femurs of rabbits. A total of 36 Ti-6Al-4V pins (15 mm length, 1.64 mm diameter) were prepared into three experimental groups. These were designed to test the effects of osseointegration on laser grooved, RGD coated, and polished control surfaces, as well as combined effects. Circumferential laser grooves were introduced onto pin surfaces (40 μm spacing) using a UV laser (λ = 355 nm). The tripeptide sequence, Arginine-Glycine-Aspartic acid (RGD), was functionalized onto laser grooved surfaces. Of the prepared samples, surface morphology and chemistry were analyzed using scanning electron microscopy (SEM) and Immunoflourescence (IF) spectroscopy, respectively. The experimental pin surfaces were surgically implanted into rabbit femurs. The samples were then harvested and evaluated histologically. Sections of the sample were preserved in a methylmethacralate mold, sliced via a hard microtome, and polished systematically. In the case of the RGD coated and laser grooved surfaces, histological results showed accelerated bone growth into the implant, pull-out tests were also used to compare the adhesion between bone and the titanium pins with/without laser textures and/or RGD coatings.
Journal of Oral Implantology, 2009
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...
Egyptian Dental Journal, 2022
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...
International Journal of Dental Sciences and Research
Egyptian Dental Journal /Egyptian Dental Journal, Apr 1, 2024
Introduction: Osteoblastic cell adhesion to the titanium alloy (Ti-6Al-4V) was found to improve a... more Introduction: Osteoblastic cell adhesion to the titanium alloy (Ti-6Al-4V) was found to improve as non-random repetitive surface roughness was provided, the aim of the current work was to produce 10 µm laser micro-grooves on titanium close to the size of osteoblastic cell body, and the results were verified by profilometry, and linear measurements of the scanning electron microscope images. Materials and methods: Plain titanium rods, 30 mm in length and 1.5 mm in diameter, were laser grooved using the coherent AVIA laser machine with different laser energies, and the resulting surface topographies were examined by profilometry, and the linear distance measurement tool of the scanning electron microscope for determination of the laser energy that produced an average of 10 µm groove width and depth. Results: Different surface topographies were obtained, ranging from surface melt down to specific micro-grooves of about 10 µm depth and width, which were produced with laser energy of 10 µJ. Conclusion: The current work produced 10 µm micro-grooves on the Ti-6Al-4V alloy using 10 µJ energy of ultraviolet laser.
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.
Egyptian Dental Journal /Egyptian Dental Journal, Apr 1, 2024
Introduction: Titanium alloy (Ti-6Al-4V) surface coating with the amino acid RGD peptide was foun... more Introduction: Titanium alloy (Ti-6Al-4V) surface coating with the amino acid RGD peptide was found to improves the adhesion of osteoblasts to the implant surface. This work aimed at comparing three different methods to immobilize the amino acid sequence RGD to the Ti-6Al-4V. Materials and methods: This article tested three different methods to immobilize the amino acid sequence RGD to Ti-6Al-4V implants surface, the first method used alkane phosphonic acid and maleimide as coupling factor, the second method used a simple dip-in technique and dehydration, and the third method used a collagen coating to which the RGD was linked, then the resulting coatings were tested using the Fourier Transform Infrared (FT-IR) spectroscopy, and surface binding energy. Results: The FT-IR and surface binding energy indicated the first method yielded better and stronger RGD coating. Conclusion: The titanium alloy chemical coating process of the amino acid sequence RGD was found to yield better results ac compare to the dip-in and RGD-collagen linking methods.
Acta Scientific Dental Scienecs
Egyptian Dental Journal
Introduction: CAD/CAM complete dentures were expected to provide better retention than convention... more Introduction: CAD/CAM complete dentures were expected to provide better retention than conventional dentures, the current work tested the retention of complete dentures manufactured by conventional and/or digital workflows using a clinical direct pull-out of the maxillary complete dentures. Materials and methods: Ten completely edentulous male patients participated in this study, each patient was provided with 3 dentures, a denture made with conventional techniques, then a denture made with combined conventional/digital techniques, and finally a denture made with digital techniques. Each denture was used for a period of one month, and at the end of the month, a denture pull-out retention test was conducted and the retentive forces of dentures in each group were collected, tabulated and statistically analyzed. Results: Dentures made with combined conventional/digital techniques had more retention than dentures made with conventional techniques, and both had more retention than dentures made with digital techniques. Conclusion: Combination of the conventional and digital workflows produced maxillary dentures with higher retention than those produced from conventional or digital workflows alone.
Egyptian Dental Journal
Introduction: The accuracy of different scanning techniques and intra-oral scan bodies (ISBs) in ... more Introduction: The accuracy of different scanning techniques and intra-oral scan bodies (ISBs) in allocating the position of dental implants in complete overdenture digital impression has been questioned, this work compared it to conventional impression in situation where 4 parallel implants were used to simulate implant-supported overdenture situations in an in-vitro setting. Materials and methods: A conventional and digital impressions using ISBs and 5 different scanning techniques were made of a study model having 4 parallel implants at teeth sites 36, 33, 43, and 46 which were designated as A, B, C, and D respectively. The resulting stone cast and digital impressions virtual casts were compared for linear deviations between the implant sites using a digital caliper versus computerized measurements, and for surface mismatching using a computerized superimposition process of the stone model scan and virtual models. The linear deviations measurements were statistically analyzed using the paired t test, and the horizontal deviations were statistically analyzed using the Kruskal Wallis test. Results: Comparison of the linear measurements on the stone cast and virtual models detected significant differences in the second and third sextants of the dental arch with techniques I and IV, while superimposition horizontal deviations detected significant differences at implant positions C and D also in techniques I and IV. Conclusions: Virtual models generated from full arch digital impressions using scan bodies and scanning techniques II, III, and V had similar accuracy to stone models developed from conventional elastomeric impressions.
Egyptian Dental Journal, 2022
Egyptian Dental Journal, 2020
Remaining teeth, attached gingiva, and eye colors present additional references for missing teeth... more Remaining teeth, attached gingiva, and eye colors present additional references for missing teeth color. 11-19 Adjacent and opposing teeth were found to have a significant color relationship. 11
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.
Advancing Nanobiomaterials and Tissue Engineering, 2013
Ramalingam/Integrated, 2012
Materials Science and Engineering: C, 2011
Titanium surfaces were designed, produced, and evaluated for levels of osseointegration into the ... more Titanium surfaces were designed, produced, and evaluated for levels of osseointegration into the femurs of rabbits. A total of 36 Ti-6Al-4V pins (15 mm length, 1.64 mm diameter) were prepared into three experimental groups. These were designed to test the effects of osseointegration on laser grooved, RGD coated, and polished control surfaces, as well as combined effects. Circumferential laser grooves were introduced onto pin surfaces (40 μm spacing) using a UV laser (λ = 355 nm). The tripeptide sequence, Arginine-Glycine-Aspartic acid (RGD), was functionalized onto laser grooved surfaces. Of the prepared samples, surface morphology and chemistry were analyzed using scanning electron microscopy (SEM) and Immunoflourescence (IF) spectroscopy, respectively. The experimental pin surfaces were surgically implanted into rabbit femurs. The samples were then harvested and evaluated histologically. Sections of the sample were preserved in a methylmethacralate mold, sliced via a hard microtome, and polished systematically. In the case of the RGD coated and laser grooved surfaces, histological results showed accelerated bone growth into the implant, pull-out tests were also used to compare the adhesion between bone and the titanium pins with/without laser textures and/or RGD coatings.
Journal of Oral Implantology, 2009
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...
Egyptian Dental Journal, 2022
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...