1,720,976 research outputs found
Accuracy of two cad-cam surgical templates
No full textObjectives: The aim of this study is to assess the accurancy of implants placed by two stereolithographic templates, Universal SurgiGuide® and Safe SurgiGuide®(Materialise-Leuven-Belgium).Methods: At the Department of Oral Sciences of “ Sapienza” , University of Rome, were selected 20 patients who needed an implant-prosthetic rehabilitation. All patients underwent CT and axial images , in DICOM format, were imported into the software SimPlant® for the planning. 227 P1H implants(Plan 1 Health- Amaro- Udine-Italia) were inserted , in partially and completely edentulous patients, using stereolithographic templates. 116 implants were inserted using the Universal SurgiGuide ®, which allowed us to control the preparation of the implant site, while 111 implants were inserted using the Safe SurgiGuide ® and guided surgery kit, with site preparation control , depth control and implant insertion guidance system. All patients underwent a CT post-operative and the images pre- and post-operative were compared. Four deviation parameters (i.e. global, angular, depth, and lateral deviation) were defined and calculated between the planned and the placed implants. Results: The implants inserted with the Universal SurgiGuide® showed a mean global deviation of 1.46 mm(range 3.88-0.17,SD 0.68), a mean angular deviation of 5.09°(range 21.16-0.10, SD 3.69), a mean lateral deviation of 0.97mm(range 3.15-0.08, SD 0.51)and a mean depth deviation of 0.97mm(range 3.53-0.02,SD 0.70). Considering the results obtained using the Safe SurgiGuide ® templates the implants inserted showed a mean global deviation of 1.51 mm(range 3.00-0.13,SD 0.60), a mean angular deviation of 4.67°(range 15.25-0.10, SD 2.97), a mean lateral deviation of 1.19 mm(range 2.61-0.12, SD 0.63) and a mean depth deviation of 0.74mm(range 2.29-0.03,SD 0.55). Conclusion: These results, allows us to confirm the reliability of two methods of computer-assisted implant placement tested
Il trattamento chirurgico conservativo delle cheratocisti odontogene.
No full textOBJECTIVES. TO report our experience in the surgical treatment of odontogenic keratocyst (OKC) patients using a ' conservative approach and evaluation of clinical results. MATERIALS AND METHODS. A clinical case treated conservatively with cystectomy and curettage of peripheral bone is fully described, with reference to the recurrence rate and review of the various treatment methods. CONCLUSIONS. Based on these results the conservative treatment of OKC offers a viable alternative to radical surgical excision. The OKC treated with an aggressive approach has a lower morbidity rate, but this method could be reserved 1 for recurrent cysts after conservative means
Piezosurgery in the maxillary sinus augmentation procedure.
No full textOBJECTIVES: The aim of this study was to investigate the incidence of the perforations of the Schneiderian membrane and the time spent for the antrostomy,separation and elevation of the sinus membrane related to the area of the bony window, using piezosurgery(Easy Surgery-BioSAFIN-Ancona-Italy). METHODS: At the Department of Oral Sciences of “Sapienza” University of Rome were selected 40 patients,19 females and 21 males, mean age was 53,6 years(range 42-67),total edentulous in the posterior maxilla, in the period between June 2005 and January 2008.The residual alveolar ridge height did not exceed 4mm. All patients underwent to maxillary sinus augmentation procedure , using piezosurgery for the osteotomy of the bony window (insert-OT1), sinus membrane separation (insert-EL1) and sinus membrane elevation (insert-EL2) .For each case treated has been evaluated the area of the bony window and the time necessary for the antrostomy, separation and elevation of the sinus membrane. Was recorded also the occurrence of Schneiderian membrane perforation. RESULTS:The average time necessary for the surgical procedure was 10.32 min (SD: 2,093) with 96.78 mm2 mean surface extension of the bony window . Seven Schneiderian membrane perforations were recorded with an incidence of 17.5%, resolved with the use of a resorbable membrane. CONCLUSION: Piezoelectric surgery allows to simplify the technique of the maxillary sinus lift by reducing the risk of perforation of the membrane, but due to less cutting efficiency, results in an increase in operative time compared with rotary instruments
Le metodiche CAD-CAM nella costruzione di pilastri protesici implantari in titanio.
No full textTo point out the use of CAD-CAM techniques in the construction of titanium customized abutment. MATERIALS AND METHODS. After evaluating the different uses of CAD-CAM techniques in dentistry over the past twenty years, the authors describe the pros and cons of currently available abutments: stock abutment, cast custom abutment (full and UCLA) and CAD-CAM abutment. After reviewing the literature about discrepancies in abutment-implant connection and freedom of rotation of CAD-CAM customized titanium abutment, the authors describe the construction of CAD-CAM abutment step by step from impression taking to finishing and polishing. CONCLUSIONS. The latest scanning technology and CADCAM production systems enable the construction of extremely accurate and perfectly fitting titanium abutments
Accuracy of 2 Different Cad-Cam Devices for Implant Placement.
No full textObjective: CAD-CAM technology allows clinicians to plan implant position on CT images and to fabricate customized surgical templates for transferring this information to the surgical field. The aim of the present study was to investigate the accuracy of a new device (SAFE SurgiGuide) of a CAD-CAM system for implant placement (Simplant®-Materialise, Leuven, Belgium) compared with the traditional one (SurgiGuide).
Methods: Ten patients were included and were treated with the Simplant® system. All patients received a scannographic template and underwent CT-Dentascan. CT images were used for planning implant positioning with the SimplantPro® software. Patients were divided into two groups: “SAFE SurgiGuide Group” (SSG), and “SurgiGuide Group” (SGG). Those in the SSG received implants with the SAFE SurgiGuide device, which uses special drills with stopping depth collars, one template with changeable drilling cylinders, and implant holders for fixture placement. In the SGG, 3 different templates (SurgiGuide) were used in each patient to guide drilling. Eighty-eight implants were placed. Two months after surgery, a control CT-scan was taken, and images of planned and placed implants were compared.
Results: Success rates for repetition of virtual and planned implant positions were: on the vestibular-oral/lingual axis, SSG = 98.35% vs. SGG = 47.39%; on the mesio-distal axis, SSG = 89.4% vs. SGG = 65.73%; and whole SSG = 96.62% vs. SGG = 56.97%. The distance from anatomical reference structures was always respected.
Conclusions: The Simplant® System allows clinicians to make precise pre-surgical evaluations and treatment programs, and to transfer them securely to the surgical phase. Better results seemed to be obtained with the Safe SurgiGuide
Etiological factors in second mandibular molar impaction.
No full textThe impaction of the second mandibular molar (MM2) has recently become more prevalent. Several etiological hypothesis have been proposed to investigate the association between skeletal features and impaction of MM2. The aims of this study were to analyze the skeletal features in patients with MM2 impaction and the association between arrested eruption of MM2 and the presence of the third mandibular molar (MM3). In this retrospective study 48 subjects from 3,530 Caucasian orthodontic patients with MM2 impaction were included in a study group (SG) and compared to a control group (CG) of 200 subjects without MM2 impaction. Panoramic radiographs evaluated the presence or absence of the MM3 germ. Cephalometric analysis was performed to evaluate linear and angular skeletal values. For the statistical analysis, descriptive statistics, Student's t-test, χ2 test and odds ratio (OR) were used. The paired comparisons between SG and CG showed in cephalometric analysis both a reduced mandibular gonial angle (ArGoMe) and lowered Jarabak's polygon value with a statistically significant difference (P≤ 0.05). MM3 was statistically significant associated (P≤ 0.05) with MM2 impaction but it is not a risk factor (OR 0.817). Subjects with MM2 impaction show a vertical condylar growth direction. MM3 is not a risk factor for MM2 impaction. Key words:Impacted mandibular second molar, skeletal features, orthodontic
Peri-implant bone loss around platform-switched Morse taper connection implants: a prospective 60-month follow-up study
No full textThe aim of this study was to measure the crestal bone level changes at 60 months of follow-up and to evaluate the influence of biologically relevant, anatomical, and implant-related variables. A prospective study design was used. STROBE guidelines were followed. A total of 576 implants were inserted in 270 patients needing an implant-supported, partial, fixed dental prosthesis or a single crown. Standardized peri-apical radiographs were obtained at 2 months (time of implant-abutment connection and prosthetic loading) and 60 months of follow-up. Descriptive statistics were used and inter- and intra-examiner reliability determined. A mixed model was used to evaluate the predictor variables. The correlation among multiple implants inserted in a single patient was considered. Significance was assessed using the type 3 test. Sensitivity analyses, least-squares means analyses, t-tests, and χ(2) tests were also conducted. The statistical analysis was performed at the implant level; P<0.05 indicated statistical significance. At the 60-month follow-up, the mean marginal bone remodelling was -0.59±1.34mm (range -5.70 to 3.65mm). Marginal bone loss was significantly influenced by implant depth, implant location, and the interactions implant depth×jaw, implant location×timing of implant placement, and jaw×implant diameter. At the 60-month follow-up, a low mean marginal bone loss was found, which was significantly higher with subcrestal implants and anterior implants
Accuratezza dell'inserimento implantare con una mascherina chirurgica stereolitografica.
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