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Sekar Abinaya,Mariappan Saravanakumar,Krishnan Chitra Shankar,Sampathkumar Jayakrishnakumar,Ramakrishnan Hariharan,Mahadevan Vallabh,Sivaprakasam Azhagarasan Nagarasampatti 대한치과이식(임프란트)학회 2022 The Korean Academy of Implant Dentistry Vol.41 No.4
Purpose: This study compared the accuracy of different elastomeric impression materials with open tray implant level impression technique in a single-tooth replacement. Materials and Methods: A reference model representing a single implant with an adjacent simulated natural tooth was fabricated. Open tray implant level impressions were made with vinylpolysiloxane (light body ExpressXT, PentaputtyPentamix2, 3MESPE, Seinfield, Germany) (Group I, n=10) and polyether (medium body Impregnum Penta, Pentamix 2, 3MESPE, Seinfield, Germany), (Group II, n=10) and implant crowns were fabricated on each master cast from their respective impressions by CNC milling and connected to the reference model with 35 Ncm torque. The accuracy of the fit was evaluated by measuring the interface gap between the implant crown and the implant replica at the mesial and distal points and by measuring the proximal gap between the implant crown and the simulated natural tooth at the buccal and the palatal points by scanning electron microscopy for each test sample. The mean values were obtained and statistically analyzed using a Mann-Whitney test. Results: The interface gap observed at the mesial point was significantly higher than the distal point. The proximal gap observed at the palatal point was significantly higher than the buccal point for both Group I and Group II. A comparison of the groups showed that the interface gap at the mesial point and the proximal gap at the buccal and palatal points obtained from polyether impression material were lower than those observed with vinylpolysiloxane group, but the difference was not significant. However, the interface gap observed at the distal point was higher with the polyether group than with the vinylpolysiloxane group, but the difference was not significant. Conclusions: Polyether and vinylpolysiloxane can be used to produce open tray implant impressions for a single missing tooth.
Shin Yonsoo,Kim Young-Kyun,Um In-Woong 대한치과이식(임프란트)학회 2020 The Korean Academy of Implant Dentistry Vol.39 No.2
Purpose: Autogenous demineralized dentin matrix (ADDM), derived from a human extracted tooth, is commonly used as a bone-graft substitute to reconstruct alveolar defects when placing dental implants. This retrospective study examined the efficacy of ADDM in terms of surgical complications and marginal bone resorption by analyzing the medical records and radiographs of the patients. Materials and Methods: ADDM grafts were performed from 2008 to 2011 at the Seoul National University Bundang Hospital. The occurrence of complications and marginal bone loss around the implants were investigated with regard to the type of defect, location of bone grafting, and types of bone graft techniques. Results: ADDM-based bone grafting was performed on 221 sites in 82 patients, and 208 implants were placed afterward. The percentage of complications after bone grafting was 15.84%, and the implant survival rate was 95.19%. All complications were resolved with conventional treatment except for the 10 cases of osseointegration failure. The average marginal bone loss was 0.31 mm at the last examination after an average follow-up period of 7.2 years. Conclusions: The results of long-term follow-up are consistent with the short-term results of relevant studies. ADDM can produce promising clinical outcomes when used for alveolar ridge augmentation around implants.
Bone graft materials for current implant dentistry
Jang Keunyoung,Lee Jong-Ho,Oh Sung-Hwan,Ham Byung-Do,Chung Sung-Min,Lee Jeong Keun,Ku Jeong-Kui 대한치과이식(임프란트)학회 2020 The Korean Academy of Implant Dentistry Vol.39 No.1
In 2018, the Autumn conference of the Korean Academy of Implant Dentistry presented a lecture on the latest knowledge on bone grafts for implant dentistry. The author summarized the characteristics, advantages, and limitations of four typical bone graft materials, which are autogenous bone graft, autogenous tooth derived bone graft, xenograft, and alloplastic graft material. In addition, this study suggested the theoretical background through a literature review on bone graft surgery in current implant dentistry.
Kim Il-hyung,Kim Hyeong Gi,Yun Pil-Young,Kim Young-Kyun 대한치과이식(임프란트)학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.1
Purpose: Patients who visit a dental clinic for molar implant therapy often present with extruded opposing teeth or inclined adjacent teeth. In such cases, if implant therapy is performed with limited orthodontic treatment, the natural tooth structure can be preserved as much as possible. These treatment methods are conducted frequently, but most related studies have been confined to case reports. This study is considered meaningful because it is the first report to review and analyze the prognosis of dental implants with limited orthodontics. Materials and Methods: From 2010 to 2017, among the patients who underwent implant therapy at Seoul National University Bundang Hospital, those who also underwent limited orthodontic treatment were investigated. Eleven implants placed in 11 patients were analyzed retrospectively. 3D modeling software with scanned diagnostic models was used to evaluate the improvement in the horizontal or vertical occlusal relationship through limited orthodontics. The prognosis for the tooth undergoing orthodontic treatment was also evaluated. Results: The average age of the 11 patients (four males and seven females) was 46.7 years, ranging from 26 to 63 years. All 11 implants placed in the posterior region survived without complications for an average of 36.7 months after functioning. Nine out of 10 implants met the success criteria. An average of 11.4 months was required to upright the inclined posterior teeth, and an average of 3.2 mm of space was gained. The extruded molars were intruded by an average of 2.1 mm over an average of 13.5 months. One of the teeth that had undergone molar uprighting was extracted because of the increased mobility after 27.0 months of orthodontic treatment completion, and none of the remaining 10 teeth exhibited significant findings. Conclusions: Dental implant therapy accompanied by limited orthodontic treatment could be considered a good treatment method that produces a satisfactory prognosis.
Unfavorable outcome of a paranasal cosmetic prosthesis caused by dental implants: a case report
Jo Hyunmi,Oh Yeonjin,Jeong Bong-Jin,Jung Junho,Ohe Joo-Young 대한치과이식(임프란트)학회 2020 The Korean Academy of Implant Dentistry Vol.39 No.3
This article presents an unfavorable outcome of a paranasal cosmetic prosthesis, Medpor, which is affected by dental implants. The paper provides treatment insight for oral and maxillofacial specialists. The patients had undergone mandibular set-back surgery combined with both paranasal augmentations using Medpor. In due course, dental implants were placed on the anterior maxilla a few years later. The patient suffered from persistent pain and purulent discharge, but no significant correlation was observed on the panorama and CBCT. Dental implants were inserted near the Medpor for a paranasal augmentation, affecting each other, resulting in clinical symptoms. Medpor, as a radiolucent material, was not visible on dental radiography. Its characteristics of a bony-like texture and color could mislead dentists to misjudge a bony structure clinically. Therefore, the dental implant fixtures were inserted near the Medpor. The Medpors on the affected area were infected, requiring it to be surgically removed. This suggests that both dental implants and Medpors failed. A comprehensive evaluation of patient history and strategic presurgical planning should be obtained to avoid an inappropriate consequence of grafting.
Hwang Seok-Ha,Ku Jeong-Kui 대한치과이식(임프란트)학회 2020 The Korean Academy of Implant Dentistry Vol.39 No.1
This paper presents the postoperative complications, gingival swelling, and erythematous of a patient at one week after bone graft using 4.5 cc of DBM incorporated with rhBMP-2 (Bio BMP2, Cellumed, Seoul, Korea) on a maxillary large cystic defect and bone remodeling result after six months. The postoperative complication and the effect of DBM incorporated with rhBMP-2 on a large cystic defect in this patient are discussed.
Hong Inseok,Park Jung Ho,Seok Hyun,Leem Dae-Ho 대한치과이식(임프란트)학회 2020 The Korean Academy of Implant Dentistry Vol.39 No.3
This report presents a case of long-term observations after guided bone regeneration and implant repair in a patient who showed severe alveolar bone loss from a periapical lesion of #46. The patient received cyst enucleation and extraction of #46 under general anesthesia, and underwent guided bone regeneration after 18 months. The implant was placed in the following year, and the patient was followed up for eleven years.
Design of the implant fixture mount and clinical complications
González-González Jesús M. 대한치과이식(임프란트)학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.1
Implants in the maxilla can cause various complications. The design of the implant fixture mount has not been previously considered as a possible cause of complications. This report presents the case of a 69-year-old man, who visited his dentist in September 2020 for oral rehabilitation due to the absence of teeth in his maxilla. A Galimplant IPX 4×8 implant was placed in position 17. Primary stability was achieved, close to the sinus but without invading it. However, when the fixture mount was removed from the implant, it was not released. A lateral movement made to release it caused the implant to lose its stability. The fixture mount could be removed, but the implant was already displaced into the maxillary sinus. The complication occurred due to the difficulty in separating the fixture mount from the implant. In this situation, the dentist had to apply a lateral force to separate the mount and this caused a loss of stability of the implant. I point out that a possible cause of the described complication could be the conical design of the fixture mount of Galimplant implant. The excessive adjustment necessitated by this mount design causes difficulties in separating it from the implant once it is inserted into the bone. This, therefore, reduces the feasibility of using this type of implant in areas with low bone density.
Fundamental understandings of mesh process and various formats of digital data in digital dentistry
Lee So-Hyoun,Jung Chang-Mo,Yoon Mi-Jung,Huh Jung-Bo,Lee Hyeonjong 대한치과이식(임프란트)학회 2021 The Korean Academy of Implant Dentistry Vol.40 No.1
Clinicians manage three-dimensional (3D) data in routine practice in the era of digital dentistry. Fundamental knowledge of digital data beyond the user’s manual provided by the companies is needed to understand and handle the 3D data in clinics. The 3D data used in the clinic are acquired by scanners and processed using a step-by-step procedure. A point cloud is an initial form of raw data. The data are then filtered, and a triangle mesh is generated. The meshes could be exported in various file formats. This fundamental knowledge would be helpful for clinicians in daily practice.