대한구강악안면임플란트학회지

Original Article

Removal of Dental Implants using Electrocautery: A Preliminary Report

Se-Jin Park, DDS, Sang-Hoon Kang, DDS, PhD

Purpose: We introduce a technique using a monopolar electrocautery unit to eliminate failed dental implant fixtures. The goal of this research was ... + READ MORE

Purpose: We introduce a technique using a monopolar electrocautery unit to eliminate failed dental implant fixtures. The goal of this research was to establish a protocol of electrocautery settings when removing dental implants. Materials and Methods: The study was conducted on f resh pork ribs. Implantium implants sized Ø4.5 × 10 mm were used. They (n = 45) were categorized into three groups according to the monopolar electric cautery power (coagulation mode) and adapted time as follows: 30 watt and 20 second (n = 15), 40 watt and 40 second (n = 15), and control group (n = 15). The torque in the removal of the implant fixtures, after monopolar electro cauterization directly inside the implant fixture, was also measured. Results: The mean torque [unit; N·mm] during removal of the dental implant fixtures with an Elcomed implant engine, after monopolar electrocauterization directly inside the implant fixture, for each group was 296 in the 30 watt and 20 second group and 184 in the 40 watt and 40 second group. The mean torque of removal of the dental implant fixtures was 279 N·mm in the control group. The mean torque was significantly lower in the 40 watt and 40 second group than in the other groups (p = 0.006). Conclusion: This method employs the principle of thermo-necrosis of the surrounding bone and weakening of the bone-implant interface. Monopolar electrocautery can be considered as an alternative method for the removal of failed or poorly positioned dental implants without the need of grinding the bony tissue surrounding the implant fixture. - COLLAPSE

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December 2019
Clinical or Case Report

Technical Note on Vestibuloplasty Around Dental Implants using Modified Edlan-Mejchar Technique: Case Series
변형된 Edlan-Mejchar 술식을 이용한 임플란트 주위 전정성형술의 기술적 측면에 대한 보고

In-Woo Cho, DDS, MSD, PhD, Dae-Young Kang, DDS, MSD, Seung-Il Shin, DMD, MSD, PhD, Hyun-Seung Shin, DDS, MSD, PhD, Jung-Chul Park, DDS, MSD, PhD
조인우, 강대영, 신승일, 신현승, 박정철

Vestibuloplasty is usually considered for improving retention and/or stability of denture by deepening vestibule and providing attached gingiva. The current case ... + READ MORE

Vestibuloplasty is usually considered for improving retention and/or stability of denture by deepening vestibule and providing attached gingiva. The current case series aimed to describe the technical aspect of modified Edlan-Mejchar vestibuloplasty for improving the sof t tissue environment around dental implants. The technique was applied to 3 patients who had a lack of vestibule and keratinized peri-implant mucosa. A U-shape incision that opens toward the implant prosthesis was performed 1 mm deep into the mucosa. It comprises of 2 vertical incisions that start 3 mm apical point from the buccal and proximal side of the implant and 1 horizontal incision that roundly connects the apical ends of the vertical incisions. Split-thickness flap was reflected on the mucosal area surrounded by the U-shape incision in the coronal direction. Another horizontal incision was performed under the flap into the periosteum along the imaginary line with the coronal edge of the U-shape. An underlying mucoperiosteal flap was reflected with dull instrument and apically positioned so that the superficial split-thickness flap could be placed on the denuded bone surface. The surgical wound was stabilized by suturing, gauze pressing, or periodontal dressing. The deepened vestibule and newly formed attached mucosa around implants were maintained in all patients during the follow-up period ranging from 3 to 9 months. The vestibular deepening with attached mucosa might be simply obtained using the technique in selected indications. However, further studies are warranted to investigate the long-term stability and histologic feature of the newly formed attached mucosa. - COLLAPSE

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December 2019
Clinical or Case Report

Progressive Hemifacial Atrophy After Implant Placement in Patients Taking Immunosuppressive Agents: Case Report
면역억제제 복용 환자에서의 임플란트 식립후 발생한 진행성 반안면 위축증: 증례 보고

Dae-Hoon Kim, DDS, Hak-Jin Kim, DDS, PhD, Kug-Jin Jeon, DDS, PhD, Jong-Ki Huh, DDS, PhD
김대훈, 김학진, 전국진, 허종기

Progressive hemifacial atrophy (PHA) is a rare disorder characterized by acquired unilateral facial atrophy. This disease mainly affects the skin and the ... + READ MORE

Progressive hemifacial atrophy (PHA) is a rare disorder characterized by acquired unilateral facial atrophy. This disease mainly affects the skin and the craniofacial tissue below forehead. It also involves dermatomes of the fifth cranial nerve. Atrophy of subcutaneous tissue, fat, muscle and osseocartilaginous structures were seen. It resulted in a sunken hemifacial appearance. Although epidermal cutaneous tissue was minimally involved, the tongue, gingiva, teeth, and palate may also be affected. The purpose of this study is to report a case of progressive hemifacial atrophy in a patient taking immunosuppressive drugs after implant and sinus graft surgery. - COLLAPSE

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December 2019
Clinical or Case Report

Use of Model-Free and Zero-Setup Computer-Guided Implant Surgical Template for Partial Edentulous Cases
부분무치악에서 모델프리, 제로셋업 컴퓨터- 가이드 임플란트 수술용 템플릿의 활용 증례

Bongchun Hur, DDS, MSD, Kyung Chul Oh, DDS, PhD, June-Sung Shim, DDS, PhD, Ji-Man Park, DDS, PhD
허봉천, 오경철, 심준성, 박지만

This case report presents the cases of single anterior missing and posterior free-end edentulous ridge with computer-guided implant placement on the day ... + READ MORE

This case report presents the cases of single anterior missing and posterior free-end edentulous ridge with computer-guided implant placement on the day of visit through a special tray containing fiducial markers without model scan or intraoral scan data. Cone beam CT was taken after fixing the marker embedded ready-made tray with a photopolymerized resin material by light-curing in the patient's mouth. The implant location was planned on the registered CT data in the planning software. The tool path calculation for the milling machine was conducted in the computer-aided manufacture (CAM) software. The guide was completed by milling the drill hole in the special tray as designed. Although the preparation for the conventional implant guide surgery takes considerable time, including data acquisition and 3D printing, it was possible to produce a guide on the day of the patient visit without a separate procedure other than a CT scan through this protocol. Also, the transfer of the implant surgery plan, the process of scanning and 3D printing, was omitted, thereby reducing the positional error between the CT data and the actual guide. - COLLAPSE

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December 2019
Clinical or Case Report

Implant Fracture After Screw Fracture in a TissueLevel Implant: A Case Report

Kyehee Wee, MS, Bo-Ah Lee, DDS, PhD

Dental implants may be a valid prosthetic treatment to replace a single tooth, but there are some complications. One complication of dental ... + READ MORE

Dental implants may be a valid prosthetic treatment to replace a single tooth, but there are some complications. One complication of dental implants is a fracture of the implant. This case report describes the implant fracture of a tissue-level implant. A patient with a tissue-level implant that was placed on the right maxillary first molar ten years ago visited the clinic because the implant prosthesis was fallen out with the fractured abutment screw. Panoramic radiograph confirmed the fracture of the abutment screw. After removing the screw fragment, a new restoration was applied. After two years, not only the screw but also the fixture was broken. The fixture fragment was surgically removed. This case implies that screw fractures can be a precursor to fixture fractures and regular check-up is necessary for preventing implant fractures. - COLLAPSE

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December 2019