Choosing Implant Type for Using with Allogeneic Bone Ring Graft: Guidance of Stress Analysis-Part I

WOS: 000429609000006Objective: The aim of this study is to compare the stress distribution of three different implant macro design applied with allogeneic cancellous bone rings using three dimensional finite element analyses. Material and Methods: Finite element models of maxilla and mandible that augmented with allogeneic bone ring graft with implants were created. Vertical force of 100 N and oblique force of 100 N at 45 degrees angle were applied to three different (variable thread, cylindrical, standard thread) macro design implants. Results: Stress concentrations in the conjunction of neck of the implant and allogeneic bone ring were higher than other areas. The highest calculated values of Von Misses stresses were observed in standard thread implant with oblique loading in mandible model. In all models the highest stress values were greater for oblique loading compare to vertical loading. Discussion: Implant macro designs shows different distributions to implanted bone or graft. It should be considered when choosing an implant in the cases augmented with allogeneic cancellous bone ring.Kirikkale University Scientific Research Project Department [2015/104]This study supported by Kirikkale University Scientific Research Project Department. Project No: 2015/104

Autogenous abdominal fat transplantation into temporomandibular joint following removal of osteochondroma

Background: An osteochondroma (OC) of the condylar process is a rare condition which primarily affects the mandibular condyle. There are several surgical treatment protocols of OC. As effective hemostatic agents and space fillers, autogenous free-fat grafts prevent scar formation and helps to hinder the accumulation of blood and serum, which otherwise, may be replaced by a dense collagen (scar), osteoid or bone. We report the autogenous abdominal fat transplantation, following the removal of a condylar OC. Methods: A 42-year-old man presented with the one-year history of progressive facial asymmetry and deviation of the chin, cross-bite to the contralateral side, and difficulty in mastication. Radiographic and clinical findings confirmed the diagnosis of an OC. Computed tomography (CT) showed lateral and inferior displacement of the right mandibular condyle due to the presence of a bone lesion from the medial aspect of the condylar head. Results: The OC was removed; the remaining portion of the condyle was re-shaped and smoothened. Abdominal fat harvesting was done 2–3 cm below the umbilicus and 3–5 cm length on the transverse midline. The defective area was filled with a harvested autogenous abdominal fat. Conclusion: Our results suggest that autogenous abdominal fat graft placement after the removal of OC with condyloplasty is yielded satisfactory treatment outcomes. Keywords: Autogenous abdominal fat, Osteochondroma, TM

Effect of Locally Applied bFGF on Implant Stability: Biomechanical Evaluation of 2 Different Implant Surfaces in Rabbits

WOS: 000340373100016PubMed: 25051415Objectives: The aim of this study was to evaluate the implant stability with the addition of local application of basic fibroblast growth factor (bFGF) during the osseointegration of 2 different dental implant surfaces using rabbit tibia model. Materials and Methods: Fifty-six dental implants, 28 of hydrophilic surface (SLActive) and 28 of hydrophobic surface (OsseoSpeed), were placed in 14 mature New Zealand rabbits. The rabbits each received both SLActive and OsseoSpeed implants per tibia, and bFGF was applied locally on 1 randomly selected tibia. Half of the subjects were killed at the fourth week of healing period, and the other half were killed at the twelfth week. Stabilization was assessed using resonance frequency analysis (RFA) and removal torque value (RTV). Results: The local application of bFGF was found to enhance osseointegration, especially at the fourth week of healing period after application (P = 0.046). RFAs and RTVs were found to be higher in bFGF-treated implant with hydrophilic surfaces when compared with both bFGF-treated hydrophobic implants and nontreated hydrophilic controls. Conclusion: Local application of bFGF seems to increase the stabilization values in implants with hydrophilic surfaces and those with hydrophobic surfaces

Oral rehabilitation with implant-supported fixed dental prostheses of a patient with cleidocranial dysplasia

Adisen, Mehmet Zahit/0000-0002-5493-8390; Yilmaz, Burak/0000-0002-7101-363X; ATIL, Fethi/0000-0002-8286-4819WOS: 000422700800005PubMed: 28578077This clinical report describes the oral rehabilitation with implant-supported fixed dental prostheses in the maxilla and mandible of a patient with cleidocranial dysplasia. Cone-beam computed tomography and a tilted implant protocol in the mandible helped to establish a conservative approach for bone preservation, prevent surgical complications, enable proper implant positioning to avoid anatomic structures, and support the fixed dental prostheses

Piezosurgery Versus Conventional Surgery in Radicular Cyst Enucleation

ATIL, Fethi/0000-0002-8286-4819WOS: 000311889300108PubMed: 23147343Objective: This study compared the use of piezosurgery and conventional surgery in radicular cyst enucleation. Study Design: The study was conducted with 29 patients who were radiologically and cytologically prediagnosed with radicular cysts in the jaw region. Nineteen patients were treated using piezosurgery, and 10 were treated using conventional surgical procedures. Surgical procedures were evaluated according to the following criteria: hemorrhage, soft-tissue damage, manipulation complexity, major perforation areas on the enucleated cyst tissue, and approximate operation duration. Patients were monitored postoperatively and evaluated for hemorrhaging at 24, 48, and 72 hours following surgery. Follow-up was conducted to check for recurrences and ranged from 5 to 24 months. Results: No complications were observed in any of the 20 patients treated using piezosurgery, although the duration of surgery was longer than expected. Of the 10 patients treated using conventional methods, hemorrhaging that affected the operation occurred in 3 cases, perforation of the cyst epithelium and difficulties in enucleation occurred in 5 cases, postoperative hemorrhage occurred in 2 cases, and recurrence was observed in 2 cases. Conclusions: Piezosurgery may be considered effective in procedures such as enucleation that require sensitive manipulation, despite the increase in the length of the overall surgical procedure. Given the results of the present study and the current lack of information in the literature regarding postoperative pain, infection, and long-term success rates associated with the use of piezosurgery in cyst enucleation, further study in this area is recommended

A Simple Solution for Vector Control in Vertical Alveolar Distraction Osteogenesis

Kisnisci, Reha/0000-0003-3397-4947WOS: 000343785000007PubMed: 25295887One of the important and frequent complications in alveolar distraction osteogenesis is vectorial change of the transport segment. This report presents a simple solution for vector angulation control by placing intermaxillary fixation screws intraoperatively. Advantages of the technique are also discussed

Spontaneous Healing of Mandibular Noncontinuous Defect Caused by Medication-Related Osteonecrosis of the Jaw

Bayram, Cem/0000-0001-8717-4668; ATIL, Fethi/0000-0002-8286-4819WOS: 000378088800026PubMed: 27244207Background: Bisphosphonates are used throughout supportive cancer therapies for the treatment of osteoporosis and metastatic bone diseases, but they invariably induce medication-related osteonecrosis of the jaw (MRONJ). This medicational modality may induce consequential losses that can lead to spontaneous or surgical therapy related bone fractures or defects. MRONJ stages and treatment alternatives are described in the current procedures. Accordingly, treatments for stages 0 and 1 are conservative whereas the treatment for stage 3 is surgical resection of the necrotic bone. Stage III MRONJ therapy is still controversial within the scope of conceivable bone fractures or defects. When the development of MRONJ is refractory to conventional treatment modalities, surgical management can be suggested. The aim of this study was to evaluate the results of the surgical treatment of MRONJ as part of a medical patient. Methods: A 72-year-old man was referred to our department for extensive pain of the left mandibular region that occurred after tooth extraction. It was identified in his medical history that he had received a nitrogen-containing intravenous bisphosphonate (Zometa; Novartis, East Hanover, NJ) therapy for prostate cancer. He had been administered 4 mg. IV Zolenat 9 times during the first year of therapy, followed by 2 doses of the same amount of Zolenat in the second year. Results: The treatment started with a therapy that combined antibiotics and antibacterial mouth rinse with chlorhexidine for maintaining oral hygiene. After the maturity of the sequestrum was identified through radiographic examination, the patient was treated by the segmental resection of the extensive necrotic bone, resulting in discontinuity of the mandibular corpus. Two years later, spontaneous bone healing occurred along the residual defect on the mandible. Conclusion: Treatment options for the defects resulting from MRONJ are still under debate, and no evidence-based guidelines are available. However, due to the results displayed in this patient; it may be a sound approach to closely follow up and observe MRONJ-related bone to prevent additional complications

A Comparison of the Low-Level Laser Versus Low Intensity Pulsed Ultrasound on New Bone Formed Through Distraction Osteogenesis

Onder, M Ercument/0000-0002-1488-616XWOS: 000307454100007PubMed: 22779421Objective: To assess and compare the effects of low-intensity pulsed ultrasound stimulation (LIPUS) and low-level laser therapy (LLLT) on the bone mineral density (BMD) of bone formed through distraction osteogenesis (DO) using dual energy x-ray absorptiometry (DEXA). Background data: LIPUS and LLLT are noninvasive supporting treatment concepts used for wound healing. LIPUS has been used to accelerate bone healing through the therapeutic effect arising from piezoelectric and angiogenetic effects on cell membranes. LLLT known as "photobiomodulation'' is used in the treatment of soft and hard tissue injuries. Methods: The study was conducted with 15 New Zealand rabbits randomly divided into three groups of 5 according to treatment, as follows: Group A: DO was performed with no further treatment; Group B: DO was performed followed by 30mW/cm(2) LIPUS at 1 Mhz for 20 min/day during the distraction period; Group C: DO was performed followed by 25mW/cm(2) LLLT at 650 nm for 10 min/day during the distraction period. DEXA was used to examine the treated areas prior to surgery and at 30 and 60 days postoperatively. Results: In the control group, the mean BMD values at both 30 and 60 days postoperatively were below the baseline level, whereas they were above at the same time intervals in the LIPUS group. In the LLLT group, the mean BMD value at 30 days postoperatively was below the baseline level, whereas it was above the baseline level at 60 days postoperatively. Conclusions: LIPUS and LLLT applied during the distraction period accelerated the DO treatment

Clinical Performance of Zygomatic Implants-Retrospective Multicenter Study

WOS: 000518823000192PubMed: 32050501The main objective of this analysis was to evaluate (1) implant survival, (2) biologic complications, and (3) demographics associated with zygomatic implants placed according to the zygomatic anatomy-guided approach (ZAGA). This retrospective multicenter study reviewed data from the charts of 82 consecutive patients who had received 182 zygomatic implants. Patients were fully edentulous (62.2%), partially edentulous (22.0%), or had failing dentition (15.9%). Most patients (87.5%) did not have previous sinusitis and 11.3% had been previously treated for it. Additionally, about half of the patients (53.8%) did not present periodontal pathology, and one-third (36.3%) did, but were subsequently treated. Most implants (93.8%) were loaded immediately, i.e., within 48 h of placement. Implants were followed for 10.5 +/- 7.2 months, and all were recorded as surviving and stable at last follow-up. Post-operative complications were infrequent and included sinusitis (10.1%) and peri-implant hyperplasia (0.8%). The low complication rate and 100% implant survival and stability indicate that zygomatic implants offer a viable treatment option when performing graftless restoration of severely resorbed maxilla, including immediate loading protocols.Nobel Biocare Services AGThis research was funded by Nobel Biocare Services AG grant number 2017-1509. The APC was funded by Nobel Biocare Services AG

Allogenic versus Autogenous Bone Rings in Dental Implant Surgery: Guidance of Stress Analysis-Part II

WOS: 000433041600020Objective The aim of this study is to compare the stress distribution along the alveolar bone following the allogenic and autogenous bone ring assisted immediate dental implant surgery using three dimensional finite element analyses Material and Methods Finite element models of maxilla and mandible that augmented with autogenous and allogenic bone ring graft with dental implant were created Vertical force of 100 N and oblique force of 100 N at 45(degrees) angle were applied to root formed design dental implant and abutment Results The highest calculated values of VonMisses (VM) stresses were observed in oblique loaded mandible model which augmented with allogenic graft In all models the highest VM stress values were greater for oblique loading compare to vertical loadings Allogenic bone ring grafts contribute the stresses more evenly through the implant, as for the autogenous grafts stresses are concentrated in the neck area of the implant Discussion Allogenic and autogenous grafts applied with implant placement create different stress distributions Stress distributions should be considered when choosing type of biomaterial.Kirikkale University Scientific Research Project Department [2015/104]This study supported by Kirikkale University Scientific Research Project Department. Project No: 2015/104