The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform

Zhiyong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Pathogenetic analysis and treatment of bone resorption after Chin Augmentation with prostheses
    Chinese Journal of Medical Aesthetics and Cosmetology, 2014
    Co-Authors: Xiaojun Tang, Zhiyong Zhang, Lei Shi, Lin Yin, Wei Liu
    Abstract:

    Objective To analyze and discuss the possible reasons of the bone resorption beneath the prostheses after Chin Augmentation.Methods Twelve patients were admitted to our department for further correction after Chin Augmentation with materials.The bone resorption was observed through the clinical research and X-ray examination.Results All the patients were underwent the removal of the materials,genioplasty was performed in 8 patients,and two patients were treated by Chin Augmentation with polyethylene.All the patients were satisfied with their facial contouring.Mild bone resorption was found in seven patients (depth of bone resorption ≤2 mm),in which five patients were used with silicone materials,two patients were performed with expanded polytetrafluoroethylene implants.Moderate bone resorption was seen in three cases.All of them were used with silicone implants (2 mm ＜ depth of bone resorption ≤4 mm).Severe bone resorption happened in two patients (depth of bone resorption ＞4 mm).One was used with silicone implant,and the other one was carried out with expanded polytetrafluoroethylene implant.Conclusions The imbalance among mentalis muscle,materials and underlying bone might be one of the key reasons.Thus for mild and moderate microgenia cases,Chin Augmentation with material is suitable,while long-term fellow-up study is necessary.But for the cases of severe mirogenia or microgenia and micrognathia with dentofacial deformity or mentalis muscle hyperactivity,genioplasty might be performed as well to correct their deformities. Key words: Prostheses;  Chin Augmentation;  Bone resorption;  Microgenia;  Silicone materials;  High-density porous polyethylene (Medpor)

  • Severe bone resorption in expanded polytetrafluoroethylene Chin Augmentation.
    Journal of Craniofacial Surgery, 2013
    Co-Authors: Lei Shi, Zhiyong Zhang, Xiaojun Tang
    Abstract:

    Expanded polytetrafluoroethylene implant is usually considered as a wonderful implant for Chin cosmetic Augmentation with no or less bone resorption compared with solid silicone implant. However, one severe bony erosion in expanded polytetrafluoroethylene Chin Augmentation was found in our clinical work. We consider that the possible reason about severe bone resorption in such situation is most relative to the mentalis muscle hyperactivity, rather than the kinds of materials. We also strongly advise that genioplasty is suitable for the cases with mentalis muscle hyperactivity caused by a dentofacial deformity.

  • Analysis of Chin Augmentation with autologous bone grafts harvested from the mandibular angle.
    Aesthetic Surgery Journal, 2009
    Co-Authors: Xiaojun Tang, Lai Gui, Zhiyong Zhang
    Abstract:

    Background Many different options are available for the treatment of microgenia, including Augmentation using silicone, alloplastic materials, and autologous bone grafts. In our experience, we have found that a prominent mandibular angle is often associated with mild to moderate microgenia. Objective The authors report on the use of bone from mandibular angle osteotomy for Chin Augmentation. Methods Exposure of the Chin region was accomplished using a transmucosal approach. The mentalis muscle fibers were sharply incised by electrocautery and stripped from the mandible in a subperiosteal plane. The excised bone from the osteotomy was formed into a suitable shape and transplanted into the mental region. Results The procedure was performed in 46 patients with an average age of 26 years. Follow-up ranged from 5 to 48 months. Cephalometric profile film and 3-dimensional computed tomography revealed undesirable levels of bone resorption in 73.9% of cases, with complete resorption in 5 cases. Only 2 cases showed minor resorption. Conclusions Use of bone from the mandibular angle for correction of microgenia shows a tendency toward resorption and a high degree of bone loss.

  • Genioplasty and Chin Augmentation with Medpore Implants: A Report of 650 Cases
    Aesthetic Plastic Surgery, 2007
    Co-Authors: Lai Gui, Lu-ping Huang, Zhiyong Zhang
    Abstract:

    Background Genioplasty is an old and useful technique. Chin Augmentation with Medpore has become popular in recent years. The authors briefly examine their experience with the two techniques.

  • Comparison study of three methods for the treatment of microgenia
    Chinese journal of plastic surgery, 2007
    Co-Authors: Lai Gui, Zhiyong Zhang, Yu-feng Liu, Ji Zhang
    Abstract:

    OBJECTIVE: To analyze the clinical results and complications of three methods for microgenia, including Chin Augmentation with silicone implant, bone autograft, and genioplasty. METHODS: The advantages and disadvantages of the three methods for microgenia were assessed through 3-D CT reconstruction, X-ray and intraoperative observation during the second operation. The indications for each technique were also studied. RESULTS: The frequently observed problems for Chin Augmentation with silicone implants were implant malposition, underlying bone absorption, periosteal reaction and undercorrection. Chin Augmentation with bone autograft had a great long-term bone graft absorption which led to undercorrection. Genioplasty showed a satisfactory cosmetic result with no serious complication. CONCLUSIONS: Chin Augmentation with silicone implant is suitable for mild microgenia with a shallow mentolabial groove, but without facial vertical insufficient and facial asymmetry. Genioplasty can be used in all kinds of microgenia in any severity, especially those with deviated Chin and facial asymmetry. Chin Augmentation with bone autograft can't achieve good long-term result and should be applied prudently.

Totsuka Yasunori - One of the best experts on this subject based on the ideXlab platform.

  • Chin Augmentation With Thin Cortical Bone Concomitant With Advancement Genioplasty
    'Elsevier BV', 2010
    Co-Authors: Matsushita Kazuhiro, Inoue Nobuo, Yamaguchi Hiro-o, Ooi Kazuhiro, Totsuka Yasunori
    Abstract:

    Genioplasty is a commonly performed procedure and various modifications of the technique have been described. One postoperative complication after advancement genioplasty is resorption of the genial segment, occasionally leading to so-called witch's Chin appearance when combined with a deep labiomental fold. To prevent this condition, bone grafting onto the advanced genial segment is commonly performed. This method, however, should necessitate grafting of a certain volume of block bone or autologous bone marrow. The donor site should be set up, occasionally even far from the recipient site such as iliac bone. We present two cases in which a novel Augmentation technique was taken. Thin cortical bone was harvested from the upper frontal sharp edge of the genial segment, where the sharp edge was sometimes reduced with a bur to avoid irritating surrounding tissues. This harvested bone was placed onto the advanced genial segment obliquely in the sagittal plane, just like covering the gap. Vacant space was made under the thin cortical bone. Neither particulate bone nor any substances were packed into the vacant space, instead keeping the space open. At least 8 months after Augmentation, the space was filled with newly formed bone. This phenomenon indicated that voluminous bone is not always required, but preparing adequate environmental circumstances for bone formation is crucial and integral. This method may bring about a new concept of the bone grafting and Augmentation

Adi Yoskovitch - One of the best experts on this subject based on the ideXlab platform.

  • estimating implant size in Chin Augmentation a simplified approach
    Canadian Journal of Plastic Surgery, 2003
    Co-Authors: Nabil Fanous, Adi Yoskovitch
    Abstract:

    A receding Chin, colloquially known as a weak Chin, is a significant aesthetic impediment to a pleasing face. Multiple techniques exist to evaluate the poorly projecting Chin, but most are imprecise when it comes to choosing the proper implant size. This choice is further complicated by the impracticality of commercially available Chin implants. Most implant manufacturers offer only three to four categories of implants (small, medium, large, etc) that differ in size from one company to another, making the choice of the proper implant size a real challenge. The present paper discusses a new approach to precise sizing of the Chin implant, based primarily on the degree of Chin convexity (curvature of the Chin pad) in the profile view. Examples of mentoplasties performed using the Chin convexity principle are presented.

  • estimating implant size in Chin Augmentation a simplified approach
    Canadian Journal of Plastic Surgery, 2003
    Co-Authors: Nabil Fanous, Adi Yoskovitch
    Abstract:

    A receding Chin, colloquially known as a weak Chin, is a significant aesthetic impediment to a pleasing face. Multiple techniques exist to evaluate the poorly projecting Chin, but most are imprecise when it comes to choosing the proper implant size. This choice is further complicated by the impracticality of commercially available Chin implants. Most implant manufacturers offer only three to four categories of implants (small, medium, large, etc) that differ in size from one company to another, making the choice of the proper implant size a real challenge. The present paper discusses a new approach to precise sizing of the Chin implant, based primarily on the degree of Chin convexity (curvature of the Chin pad) in the profile view. Examples of mentoplasties performed using the Chin convexity principle are presented.

Yasunori Totsuka - One of the best experts on this subject based on the ideXlab platform.

  • Chin Augmentation with thin cortical bone concomitant with advancement genioplasty.
    Journal of Oral and Maxillofacial Surgery, 2010
    Co-Authors: Kazuhiro Matsushita, Nobuo Inoue, Hiro-o Yamaguchi, Kazuhiro Ooi, Yasunori Totsuka
    Abstract:

    The Chin plays a prominent role in establishing, not only esthetics, but also function. An incompetent lip seal and tension of the mentalis muscle in swallowing can be important symptoms. Genioplasty is one of the options for addressing the Chin deformity and dysfunction caused by morphologic dcficiencies. 1 Postoperative complications can include resorption of grafted bone and a deep labiomental fold. Lateral wings of the genial segment are apt to be resorbed, occasionally leading to the so-called witch's Chin appearance, 2 if combined with a deep labiomental fold. To overcome this problem, various strategies have been reported. 3 We describe a novel method to augment the Chin structure with a desirable labiomental fold using thin cortical bone alone. Surgeons generally depend on radiography or computed tomography to evaluate genioplasty. However, we had the opportunity to see firsthand the actual state of bony union in these cases when subsequent anterior subapical alveolar osteotomy was performed several months later. We report 2 cases in which substantial bone Augmentation was achieved.

Xiaojun Tang - One of the best experts on this subject based on the ideXlab platform.

  • Pathogenetic analysis and treatment of bone resorption after Chin Augmentation with prostheses
    Chinese Journal of Medical Aesthetics and Cosmetology, 2014
    Co-Authors: Xiaojun Tang, Zhiyong Zhang, Lei Shi, Lin Yin, Wei Liu
    Abstract:

    Objective To analyze and discuss the possible reasons of the bone resorption beneath the prostheses after Chin Augmentation.Methods Twelve patients were admitted to our department for further correction after Chin Augmentation with materials.The bone resorption was observed through the clinical research and X-ray examination.Results All the patients were underwent the removal of the materials,genioplasty was performed in 8 patients,and two patients were treated by Chin Augmentation with polyethylene.All the patients were satisfied with their facial contouring.Mild bone resorption was found in seven patients (depth of bone resorption ≤2 mm),in which five patients were used with silicone materials,two patients were performed with expanded polytetrafluoroethylene implants.Moderate bone resorption was seen in three cases.All of them were used with silicone implants (2 mm ＜ depth of bone resorption ≤4 mm).Severe bone resorption happened in two patients (depth of bone resorption ＞4 mm).One was used with silicone implant,and the other one was carried out with expanded polytetrafluoroethylene implant.Conclusions The imbalance among mentalis muscle,materials and underlying bone might be one of the key reasons.Thus for mild and moderate microgenia cases,Chin Augmentation with material is suitable,while long-term fellow-up study is necessary.But for the cases of severe mirogenia or microgenia and micrognathia with dentofacial deformity or mentalis muscle hyperactivity,genioplasty might be performed as well to correct their deformities. Key words: Prostheses;  Chin Augmentation;  Bone resorption;  Microgenia;  Silicone materials;  High-density porous polyethylene (Medpor)

  • Severe bone resorption in expanded polytetrafluoroethylene Chin Augmentation.
    Journal of Craniofacial Surgery, 2013
    Co-Authors: Lei Shi, Zhiyong Zhang, Xiaojun Tang
    Abstract:

    Expanded polytetrafluoroethylene implant is usually considered as a wonderful implant for Chin cosmetic Augmentation with no or less bone resorption compared with solid silicone implant. However, one severe bony erosion in expanded polytetrafluoroethylene Chin Augmentation was found in our clinical work. We consider that the possible reason about severe bone resorption in such situation is most relative to the mentalis muscle hyperactivity, rather than the kinds of materials. We also strongly advise that genioplasty is suitable for the cases with mentalis muscle hyperactivity caused by a dentofacial deformity.

  • Analysis of Chin Augmentation with autologous bone grafts harvested from the mandibular angle.
    Aesthetic Surgery Journal, 2009
    Co-Authors: Xiaojun Tang, Lai Gui, Zhiyong Zhang
    Abstract:

    Background Many different options are available for the treatment of microgenia, including Augmentation using silicone, alloplastic materials, and autologous bone grafts. In our experience, we have found that a prominent mandibular angle is often associated with mild to moderate microgenia. Objective The authors report on the use of bone from mandibular angle osteotomy for Chin Augmentation. Methods Exposure of the Chin region was accomplished using a transmucosal approach. The mentalis muscle fibers were sharply incised by electrocautery and stripped from the mandible in a subperiosteal plane. The excised bone from the osteotomy was formed into a suitable shape and transplanted into the mental region. Results The procedure was performed in 46 patients with an average age of 26 years. Follow-up ranged from 5 to 48 months. Cephalometric profile film and 3-dimensional computed tomography revealed undesirable levels of bone resorption in 73.9% of cases, with complete resorption in 5 cases. Only 2 cases showed minor resorption. Conclusions Use of bone from the mandibular angle for correction of microgenia shows a tendency toward resorption and a high degree of bone loss.