scholarly journals Digital Workflow for Periodontal Crown Lengthening in Treatment of Altered Passive Eruption: Case Report

2020 ◽  
pp. 27-30
Author(s):  
Vilma A Umanzor ◽  
Hugo H Romero ◽  
Zamir Kafati ◽  
Ana Rodriguez ◽  
Juan Guifarro ◽  
...  
Keyword(s):  
Soft Tissues ◽  
Cone Beam ◽  
Computer Assisted ◽  
Surgical Guide ◽  
Computed Tomography Images ◽  
Surgical Guides ◽  
Planning Software ◽  
Cone Beam Computerized Tomography ◽  
Precise Representation ◽  
Crown Lengthening

This paper describes the treatment of a patient diagnosed clinically and based on cone beam computed tomography images with excessive gingival display caused by altered passive eruption Type 1B. A digitally computer designed and 3-D printed surgical guide was fabricated for crown lengthening to provide periodontal esthetics. The combination of intraoral scanners and cone-beam computerized tomography images, and use of planning software, provides a very precise representation of the real conditions of the hard and soft tissues. The design and fabrication of computer surgical guides can improve precision and predictability for surgical procedures and can be superior to conventional free-handed surgery in terms of efficiency and treatment outcomes. Surgical experience and general understanding of computer assisted systems and thorough knowledge of conventional protocols is mandatory to make routine use of these systems. To select a treatment modality, the etiology must be clearly identified and the patient has to be informed of his options for treatment which for this condition are a gingivectomy or an apically positioned flap with or without osseous reduction determined by the type of altered passive eruption.

scholarly journals In-house 3D-printed surgical guides for osseous lesions of the lower jaw: an experimental study

2021 ◽  
Vol 26 (1) ◽  
Author(s):  
Lukas Postl ◽  
Thomas Mücke ◽  
Stefan Hunger ◽  
Oliver Bissinger ◽  
Michael Malek ◽  
...  
Keyword(s):  
Control Group ◽  
Head Model ◽  
Computer Assisted ◽  
3D Printer ◽  
Surgical Guide ◽  
Surgical Guides ◽  
Lower Jaw ◽  
Bony Lesion ◽  
3D Printed ◽  
Phantom Head

Abstract Background The accuracy of computer-assisted biopsies at the lower jaw was compared to the accuracy of freehand biopsies. Methods Patients with a bony lesion of the lower jaw with an indication for biopsy were prospectively enrolled. Two customized bone models per patient were produced using a 3D printer. The models of the lower jaw were fitted into a phantom head model to simulate operation room conditions. Biopsies for the study group were taken by means of surgical guides and freehand biopsies were performed for the control group. Results The deviation of the biopsy axes from the planning was significantly less when using templates. It turned out to be 1.3 ± 0.6 mm for the biopsies with a surgical guide and 3.9 ± 1.1 mm for the freehand biopsies. Conclusions Surgical guides allow significantly higher accuracy of biopsies. The preliminary results are promising, but clinical evaluation is necessary.

scholarly journals Three-dimensional evaluation of mid-facial soft tissue changes after expansion using micro-implant-supported maxillary skeletal expander

2020 ◽  
Author(s):  
Hieu Nguyen ◽  
Jeong Won Shin ◽  
Hai-Van Giap ◽  
Ki Beom Kim ◽  
Hwa Sung Chae ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Computerized Tomography ◽  
Soft Tissues ◽  
Cone Beam ◽  
Maxillary Expansion ◽  
Hard Tissue ◽  
Facial Soft Tissue ◽  
Tissue Changes ◽  
Cone Beam Computerized Tomography ◽  
Soft Tissue Changes

Abstract Background The aim of this study was to assess the mid-facial soft tissue changes induced by a micro-implant-supported maxillary skeletal expander in late adolescents and young adults by cone-beam computerized tomography and the correlations between hard and soft tissue changes after expansion with maxillary skeletal expander.Subjects and methods Twenty patients with maxillary transverse deficiency treated with maxillary skeletal expander were selected. Cone-beam computerized tomography images taken before and after expansion were superimposed to measure the changes in soft and hard tissue landmarks.Results Anterior nasal spine, posterior nasal spine, and alveolar bone width were significantly increased after expansion with maxillary skeletal expander (p < 0.05). The average lateral movement of the cheek points was 1.13 ± 0.33 mm (left) and 1.41 ± 0.39 mm (right), while that of the alar curvature points was 1.07 ± 0.72 mm (left) and 1.06 ± 0.68 (right) (p < 0.05). The average forward displacement of the cheek points was 0.42 ± 0.66 mm (left) and 0.60 ± 0.58 mm (right), whereas that of the alar curvature points was 0.80 ± 0.67 mm (left) and 0.68 ± 0.56 mm (right) side (p < 0.05). The average downward movement of the subnasale was 0.40 ± 0.37 mm (p < 0.05). The changes in cheek points and alar curvature points on both sides significantly correlated with hard-tissue changes (p < 0.05).Conclusions Maxillary expansion using maxillary skeletal expander resulted in significant lateral and forward movement of soft tissues of the cheek and alar curvature points on both sides and correlated with the maxillary suture opening at the anterior and posterior nasal spines.

A New Twist on Surgical Guides

2008 ◽  
Vol 34 (6) ◽  
pp. 325-329 ◽  
Author(s):  
Trevor Bavar
Keyword(s):  
Computer Assisted ◽  
Implant Surgery ◽  
Surgical Guide ◽  
Time Of Surgery ◽  
Surgical Guides ◽  
Rotational Position ◽  
Computer Assisted Tomography ◽  
Ct Technology

Abstract Surgical guides have evolved to the point that they can be created with the aid of computer-assisted tomography (CT) technology. Surgical guides also are used in construction of the prosthesis prior to implant surgery. With existing guide techniques, the prosthesis is screw retained, or cone-shaped temporary abutments may be used to overcome the lack of parallelism of the implants. With the New Twist technique, we are able to create the surgical guide in such a way that optimum bone may be used and the rotational position of the implant may be established for the surgeon and for the laboratory. Custom abutments are inserted at the time of surgery, as is an esthetic, functionally provisional cemented prosthesis. Castings for the finished ceramo-metal bridge are fabricated before surgery is performed. The final prosthesis then is easily constructed by the restorative dentist during just 3 simple patient visits.

scholarly journals Accuracy of Customized Prefabricated Screw-Type Immediate Provisional Restorations after Single-Implant Placement

2019 ◽  
Vol 8 (4) ◽  
pp. 490 ◽  
Author(s):  
Kyung Chul Oh ◽  
Jee-Hwan Kim ◽  
Chang-Woo Woo ◽  
Hong Seok Moon
Keyword(s):  
Computer Aided Design ◽  
Computer Assisted ◽  
Angular Deviation ◽  
Intraoral Scanner ◽  
Planning Stage ◽  
Implant Placement ◽  
Surgical Guides ◽  
Planning Software ◽  
Single Implant

Limited evidence is available comparing the differences between pre-operative and post-operative 3D implant positions from the viewpoint of prosthetics. We aimed to investigate the differences between preplanned positions of virtual provisional restorations and their actual positions following fully guided single-implant placement. Ten maxillary typodonts with missing right central incisors were imaged using cone-beam computed tomography, and digital impressions were obtained using an intraoral scanner. These data were imported into implant-planning software, following which the provisional restorations were designed. After data superimposition, an appropriate implant position was determined, and a computer-assisted implant surgical guide was designed for each typodont. Orders generated from the implant-planning software were imported into relevant computer-aided design software to design the custom abutments. The abutments, provisional restorations, and surgical guides were fabricated, and each restoration was cemented to the corresponding abutments, generating a screw-type immediate provisional restoration. The implants were placed using the surgical guides, and the screw-type provisional restorations were engaged to the implants. The typodonts were then rescanned using the intraoral scanner. The restorations designed at the treatment planning stage were compared with those in the post-operative scan using metrology software. The angular deviation around the central axis of the implant was measured, and the differences in the crown position were converted to root mean square (RMS) values. The post-operative provisional restorations exhibited an absolute angular deviation of 6.94 ± 5.78° and an RMS value of 85.8 ± 20.2 µm when compared with their positions in the pre-operative stage. Within the limitations of the present in vitro study, the results highlight the potential application of customized prefabricated immediate provisional restorations after single-implant placement.

scholarly journals 3D-Printed Surgical Guide for Crown Lengthening Based on Cone Beam Computed Tomography Measurements: A Clinical Report with 6 Months Follow Up

2020 ◽  
Vol 10 (16) ◽  
pp. 5697
Author(s):  
Abdulkareem Alhumaidan ◽  
Ayed Alqahtani ◽  
Faisal al-Qarni
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Clinical Report ◽  
Surgical Guide ◽  
Satisfactory Outcome ◽  
Common Clinical Presentation ◽  
3D Printed ◽  
Crown Lengthening

Excessive gingival display is a common clinical presentation that often requires surgical intervention. This report is for a patient for whom esthetic crown lengthening is indicated due to altered passive eruption. Cone beam computed tomography (CBCT) scan and an intraoral scan were used to design and print a single surgical guide which provided a reference for both gingivectomy and osteoectomy. A satisfactory outcome was obtained 6 months after surgery. The present technique provided a simplified method of generating a surgical guide with predictable results by relying on the existing tooth anatomy rather than diagnostic waxing. This technique is particularly useful when crowns or veneers are not indicated.

scholarly journals Virtually Planned and Integrated Template-Guided Implant Surgical Placement: A Case Report

2018 ◽  
Vol 06 (01) ◽  
pp. 040-042
Author(s):  
K. Kuckreja ◽  
Harinder Kuckreja
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Functional Restoration ◽  
Cone Beam ◽  
Immediate Loading ◽  
Surgical Guide ◽  
Implant Placement ◽  
Planning Software ◽  
Osseointegrated Implants ◽  
Three Dimensional Space

AbstractThe placement of dental implants in the maxillary anterior region is a challenge for clinicians because of existing anatomy and high esthetic demands. This article presents a case with limited anatomical three-dimensional space for implant placement and immediate loading for esthetic and functional restoration.Virtual implant placement was planned using cone beam computed tomography (CBCT) scan, casts with trial denture bases, implant planning software (Nobel Clinician), and prosthetic designing software (Procera) to fabricate a surgical guide.The article describes the successful application of “Smart Fusion” (Nobel Biocare) in the production of the surgical template for accurate placement of osseointegrated implants.

scholarly journals Mandibular Reconstruction Using ProPlan CMF: A Review

2017 ◽  
Vol 1 (1) ◽  
pp. s-0037-1606835 ◽  
Author(s):  
Ryo Sasaki ◽  
Michael Rasse
Keyword(s):  
Computer Assisted Surgery ◽  
Mandibular Reconstruction ◽  
Patient Specific ◽  
Computer Assisted ◽  
Planning Service ◽  
Virtual Planning ◽  
Surgical Guide ◽  
Surgical Guides ◽  
Computer Aided

ProPlan CMF (Depuy Synthes, Solothurn, Switzerland, and Materialise, Leuven, Belgium) is a computer-aided surgical virtual planning service using an online meeting with professional medical engineers and transfers patient-specific surgical guide to the virtual plan. Moreover, prebent reconstruction plates or patient-specific computer-aided manufacturing-fabricated reconstruction can also be used. This service started in 2011. Currently, it is widely used in Europe. Current status of mandibular reconstruction with ProPlan CMF vertical planning service with the surgical guide was reviewed. The accuracy was excellent in terms of contact of the osteotomized parts and the contact to the remaining skeleton. The authors found that currently, a small number of reports regarding the mandibular reconstruction with virtual planning service and surgical guides are available. These reports also have a small number of cases and short-term follow-up results. In this situation, this review revealed that (1) mainly the resection guides, cutting guides, and patient-specific mandible reconstruction plates were adequately well fitted to the surgical site intraoperatively, (2) the ischemic time might be more reduced than that of the conventional surgery (3) the accuracy of computer-assisted surgery in the mandibular reconstruction was clinically acceptable, and (4) condyle positions after the computer-assisted surgery was mainly normal. The higher additional cost than that of the conventional technique is presently an issue. Large-scale clinical studies and long-term follow-up studies are demanded.

scholarly journals Prevalence of soft tissue calcifications in CBCT images from the Oral and Maxillofacial Radiology Service at UNAB, Viña del Mar, Chile.

2020 ◽  
Vol 9 (6) ◽  
pp. 457-465
Author(s):  
Patricio Meléndez-Rojas ◽  
◽  
Leniz Arancibia-Mesas ◽  
Carolina Poblete-Carrasco ◽  
◽  
...  
Keyword(s):  
Computed Tomography ◽  
Soft Tissue ◽  
Cone Beam Computed Tomography ◽  
Soft Tissues ◽  
Cone Beam ◽  
Maxillofacial Radiology ◽  
Cross Sectional ◽  
Radiology Service ◽  
Computed Tomography Images ◽  
Oral And Maxillofacial Radiology

Soft tissue calcifications can indicate the presence of more serious, potentially life-threatening pathologies. Therefore, their study can lead to an early diagnosis of those conditions that have not yet become clinically apparent. Main objective: To determine the prevalence of calcifications in soft tissues of the head and neck in cone beam computed tomography images obtained from the Oral and Maxillofacial Radiology Service at Universidad Andrés Bello (UNAB), Viña del Mar, Chile. Material and Methods: Retrospective, cross-sectional, quantitative study. A total of 288 images of cone beam computed tomography (CBCT) were used. Images were obtained at random from the database of the Oral and Maxillofacial Radiology Service at UNAB, Viña Del Mar, between 2014 and 2019. Results: A prevalence of 59.72% of soft tissue calcifications was obtained. The most prevalent were: tonsilloliths and calcified stylohyoid ligament, accounting for 30.65% and 45.56%, respectively. Conclusion: A high prevalence of soft tissue calcifications was found in a population that has not been studied previously; therefore, it is important that the dentist perform a detailed analysis of the cone beam computed tomography.

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