• Title/Summary/Keyword: Dental procedure

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Evaluation of marginal discrepancy in metal frameworks fabricated by sintering-based computer-aided manufacturing methods

  • Kaleli, Necati;Ural, Cagri;Us, Yesim Olcer
    • The Journal of Advanced Prosthodontics
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    • v.12 no.3
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    • pp.124-130
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    • 2020
  • PURPOSE. The aim of this in vitro study was to evaluate the effect of sintering procedures on marginal discrepancies of fixed partial metal frameworks fabricated using different sintering-based computer-aided design and computer/aided manufacturing (CAD/CAM) techniques. MATERIALS AND METHODS. Forty resin die models of prepared premolar and molar abutment teeth were fabricated using a three-dimensional (3D) printer and divided into four groups (n = 10) according to the fabrication method of metal frameworks used: HM (via hard milling), SM (via soft metal milling), L25 (via direct metal laser melting [DMLM] with a 25 ㎛ layer thickness), and L50 (via direct DMLM with a 50 ㎛ layer thickness). After the metal frameworks were fabricated and cemented, five vertical marginal discrepancy measurements were recorded in each site (i.e., buccal, facing the pontic, lingual, and facing away from the pontic) of both abutment teeth under a stereomicroscope (×40). Data were statistically analyzed at a significance level of 0.05. RESULTS. No statistically significant differences (P>.05) were found among the four axial sites of metal frameworks fabricated by sintering-based CAD/CAM techniques. The HM and L25 groups showed significantly (P<.001) lower marginal discrepancy values than the SM and L50 groups. CONCLUSION. Marginal discrepancy in the sites facing the pontic was not influenced by the type of sintering procedure. All fabrication methods exhibited clinically acceptable results in terms of marginal discrepancies.

A STUDY ON THE SURFACE ROUGHNESS OF GLAZED PORCELAIN AND POLISHED PORCELAIN (글레이징처리한 도재와 연마한 도재의 표면조도에 관한 연구)

  • Choi, Mee-Ra;Chung, Hun-Young;Lee, Sun-Hyeong;Yang, Jae-Ho
    • The Journal of Korean Academy of Prosthodontics
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    • v.36 no.4
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    • pp.549-565
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    • 1998
  • Porcelain is considered to be one of the materials of choice for restoration where esthetics is of concern. But porcelain surface without final glazing treatment may induce undesirable results such as inflammatory response on adjacent soft tissues due to plaque accumulation and increased wear of opposing teeth. Therefore, rough porcelain surface must be smoothened by final glazing treatment or chairside polishing procedure. The purpose of this study was to compare the surface roughness among self-glazed, overglazed and polished porcelain with various polishing kit, and to detect which phase of polishing is optimal in clinic. Specimens were fabricated with Vita VMK porcelain. The surface treatment of each group was performed as follows. Group 1 : overglazing treatment Group 2 : self-glazing treatment Group 3 : polishing with the Truluster Polishing System for Porcelain(Brasseler, U.S.A.) Group 4 : polishing with the Exa Cerapol Adjustment kit (Edenta dental products, Switzerland) followed by finishing with diamond-filled polishing paste Group 5 : polishing with the Shofu Porcelain Adjustment kit (Shofu inc., Japan) followed by finishing with diamond-filled polishing paste. At each polishing steps, the measurement of Ra and Rq values were performed, and the surface was examined by scanning electron microscope. The results were as follows : 1. Overglazing treatment brought smoother surface than self-glazing treatment. 2. Polishing systems without porcelain polishing paste did not make better result than self-glazing treatment. 3. Polishing system with porcelain polishing paste made similar result to overglazing treatment. 4. Applying diamond-filled polishing paste after using polishing system which has no porcelain polishing paste produced surface as smooth as overglazing treatment does.

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REIMPLANTATION OF FREEZE-TREATED AUTOGENOUS BONE AFTER MANDIBULECTOMY;REPORT OF THREE CASES (하악골 절제술후 재이식된 동결자가골 재이식;치험 3례)

  • Kim, Sik;Kim, Su-Gwan;Kim, Woon-Kyu;Kim, Soo-Min;Ryu, Chong-Hoy;Lee, Jun-Gil;Cho, Gyeong-An;Kim, Soo-Heung;Chung, Tae-Young;Yeo, Hwan-Ho
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.23 no.2
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    • pp.185-190
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    • 2001
  • We described three cases of immediate reimplantation of a frozen-thawed autogenous mandible composed of a mixture of iliac bone, marrow, and particulate hydroxyapatite in tumors of the mandible. Acceptable outcomes were obtained in three patients who underwent immediate autogenous mandibular graft reconstruction. The conditions leading to successful outcome of the procedure are also discussed. Reimplantation of frozen autogenous lesioned mandible was performed in three patients with mandibular tumors. Two reimplanted grafts survived without complications following surgery. One case had postoperative infection that resolved with appropriate antibiotic treatment. There were no recurrences of the primary lesions. Satisfactory facial contour after surgery was achieved. These results are most promising, and we believe that, with further refinement, this technique will offer a new and acceptable modality for facial reconstruction in patients with cancer.

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Anatomical Review of Anterolateral Thigh Flap for the Oral and Maxillofacial Reconstruction (구강악안면재건을 위한 전외측대퇴피판의 해부학적 고찰)

  • Kim, Soung Min;Park, Jung Min;Oh, Jin Sil;Myoung, Hoon;Lee, Jong Ho
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.35 no.4
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    • pp.265-275
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    • 2013
  • The anterolateral thigh flap (ALTF) is a versatile fasciocutaneous or myocutaneous flap, which can be harvested incorporating several skin islands and muscle components. The perforator of the ALTF is usually derived from the descending or transverse branch of the lateral circumflex femoral artery, and these vessels are based mainly on musculocutaneous perforators traversing the vastus lateralis muscle, and also based on the septocutaneous vessels running in between the rectus femoris and vastus lateralis muscle. Despite its usefulness for the oral cavity reconstruction, anatomic variations of these nutrient vessels, such as three main branches of ALTF and its relations with sartorius, vastus lateralis, tensor fasciae latae and rectus femoris muscle, have been reconstructive surgeons to be hesitated for the selection of ALTF. For the better understanding of ALTF as a routine reconstructive procedure in oral and maxillofacial surgery, various anatomical findings must be learned and memorized by young doctors in the course of the special curriculum periods for the Korean national board of oral and maxillofacial surgery. This review article will discuss the vascular anatomy and relavant anatomical variations of ALTF with Korean language.

A CLINICAL STUDY ON PULMONARY FUNCTION AFTER INTERMAXILLARY FIXATION (악간고정이 호흡기능에 미치는 영향에 대한 임상적 연구)

  • Kim, Chul-Hwan;Kim, Mi-Suk
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.25 no.4
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    • pp.361-366
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    • 1999
  • Intermaxillary fixation is routine procedure to oral and maxillofacial area in jaw bone fracture, surgical correction of jaw deformity, osseus reconstruction of jaw. After transoral surgery, accompanied by intermaxillary fixation, dysphagia or airway obstruction may be followed due to blood clot, vomitus, or laryngeal spasm resulting from irritation by blood or secretions. Lingual or pharyngeal edema is other contributing factors of airway obstruction. In addition, intermaxillary fixation itself may cause obstruction of airway. In this study, pulmonary function test and arterial blood gas analysis were evaluated before and after intermaxillary fixation in 30 patients suffered from mandibular fractures. Comparative analysis was performed by estimated values. The results were as followed. 1. The spirometric values of FEV1, FEV1/FVC and FEF25-75% without intermaxillary fixation were reduced from 97.57%, 85.1%, 98.3,% to 71.7%, 66.5%, 61.2% with intermaxillary fixation, indicating the presence of obstructive pulmonary impairment. 2. Spirometric value of MVV, as the most influencing value of sensitive to extrapulmonary factors, was changed from 84.5% to 46.48%. 3. After intermaxillary fixation, the spirometric value of FVC, as indicator of restrictive pattern of pulmonary function, was not reduced significantly as measured from 94.47% to 89.97%. 4. $O_2$ saturation of arterial blood gas analysis without intermaxillary fixation was 97.86%. While intermaxillary fixation, $O_2$ saturation was 97.47%. The results indicate that careful airway management is mandatory undergoing intermaxillary fixation of various oral and maxillofacial surgery.

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Transoral removal of proximal submandibular stone: report of 5 cases and review of the literature (구강 내 접근법에 의한 심부 악하선 타석제거술)

  • Lim, Kyoung-Min;Lee, Seung-June;Kil1, Tae-Jun;Choi, Eun-Ju;Kim, Hyung-Jun;Cha, In-Ho;Nam, Woong
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.36 no.6
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    • pp.548-552
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    • 2010
  • The submandibular gland is the second largest major salivary gland, which secretes 40% of the total daily saliva. Owing to its anatomic characteristics as well as the high viscosity and basicity of the saliva, sialolithiasis is found most commonly in the submandibular gland. Sialolithiasis that cannot be treated by conservative treatment is conventionally removed by an excision of the submandibular gland. Generally, an excision of the submandibular gland is performed via an extra-oral approach but the disadvantages of this treatment include a risk of injuring the facial nerve and scar formation. Case reports have revealed an even less invasive intraoral surgical technique for the removal of sialolith that does not affect the submandibular gland function. The functional recovery of the gland, complications and recurrence rates after surgery with this conservative intraoral procedure were all successful. We report 5 patients from the department of Oral and Maxillofacial Surgery at Dental Hospital, Yonsei University, who had undergone a resection of the sialolith though the intraoral approach with successful results.

A STUDY ON LABIOCERVICAL MARGINAL FITNESS AND MARGINAL ROUNDING OF COLLARLESS METAL CERAMIC RESTORATION (Collarless 도재용착주조관의 치경부 도재 변연부의 적합도 및 rounding의 비교)

  • Shin, Suk-Hoon;Lee, Ho-Yong
    • The Journal of Korean Academy of Prosthodontics
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    • v.33 no.2
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    • pp.198-209
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    • 1995
  • In order to evaluate the fitness and the degree of rounding of porcelain margins in collarless metal cermic restorations, collarless metal ceramic restorations were fabricated with shoulder margins of 90 and 120 degress, each consisting of ten specimens, on master dies through the direct lift technique. And ten metal ceramic restorations with a shoulder 90 degrees were fabricated. All specimens were embedded in resin and sectioned longitudinally. The sections were observed under a stereomicroscope and photographed(${\times}$200). The labial marginal gap between the die and the porcelain margin were measured with a scale. The space between the porcelain margin and the die, that is formed from marginal rounding and cementation were calculated with a computer coordinating area curvimeter. The following results were obtained. 1. There was no statistical difference between the fitness of porcelain margin of collarless metal ceramic restorations and marginal fitness of metal ceramic restoration. 2. There was no statistical difference between a shoulder of 90 and 120 degrees in the fitness of porcelain margin of collarless metal ceramic resorations. 3. Collarless metal ceramic restorations with a shoulder of 90 degrees and 120 degrees showed significantly more labial marginal rounding than metal ceramic restorations. 4. There was no statistical difference between a shoulder of 90 and 120 degrees in rounding of porcelain margin of collarless metal ceramic restorations. According to the results, rounding of porcelain margins can be observed in collarless metal ceramic restorations. Thus, there is a need for improvement in dental materials and techniques to minimize this problem, Furthermore, care should be exercised during the clinical procedure.

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Use of Digital Smile Design in esthetic restoration in anterior teeth: A case report (전치부의 심미 수복을 위하여 Digital Smile Design을 적용한 증례)

  • Shin, Sejun;Noh, Kwantae;Kwon, Kung-Rock;Kim, Hyeong-Seob
    • The Journal of Korean Academy of Prosthodontics
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    • v.55 no.2
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    • pp.164-170
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    • 2017
  • When restoring their anterior dentition, patients become more demanding on esthetics compared to posterior region during treatment planning phase. Digital Smile Design (DSD) procedure is performed in presentation software and digital photographs. This can widen diagnostic visualization and aid in transferring information between clinician, patient, and technician. This case presented is that of patient with dissatisfaction of his anterior old restoration. Retreatment procedures were carried out in two different manners: (1) using DSD protocol for diagnosis, smile simulation, communication and fabricating interim and definitive prosthesis by totally digitized workflow. (2) Using diagnostic wax-up for smile design and fabricating restorations by conventional workflow. Comparing two methods, DSD was easier to communicate between the dental team than the diagnostic wax-up method. But the final result obtained failed to meet total esthetic factors. Therefore, to obtain predictable esthetic results, more advanced design tool would be needed, including consideration of various esthetic factors besides successful communications.

Immediate loading of mandibular single implant by using surgical guide and modeless digital prosthesis: a case report (수술용 가이드와 modeless 디지털 보철물을 이용한 하악 구치부 단일 임플란트 즉시 하중 증례)

  • Lim, Hyun-jeong;Kim, Myung-Joo;Kwon, Ho-Beom;Lim, Young-Jun
    • Journal of Dental Rehabilitation and Applied Science
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    • v.33 no.4
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    • pp.299-306
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    • 2017
  • In this case report, immediate loading of an implant-supported single-tooth prosthesis through complete digital workflow. A patient presented for restoration of missing a single tooth in the mandibular first molar. The digital impression was made with intraoral scanner and implant was placed using surgical guide pre-fabricated with pre-operative computed tomography (CT) and scan data. After 1 week later, prefabricated customized abutment and provisional restoration were connected for immediate loading. After 8 weeks later, abutment level impression was taken by intraoral scanner. At 3 months later from implant installation, monolithic zirconia crown were fabricated. This clinical report presents satisfying result in accuracy and patient satisfaction. A completely modeless digital procedure met expectations regarding precision, esthetics, and functionality.

Implant-retained overdenture with CM LOC® Pekkton® in maxillary edentulous patient (상악 완전 무치악 환자에서 CM LOC® Pekkton® attachment를 이용한 임플란트 유지 피개의치 수복 증례)

  • Hong, Mun Gi;Shin, Soo-Yeon
    • Journal of Dental Rehabilitation and Applied Science
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    • v.33 no.4
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    • pp.321-328
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    • 2017
  • Treatment options for edentulous patients are complete denture and implant prosthesis. A two implant-retained overdenture can be considered the first treatment in the edentulous mandible, but there is no clear consensus of treatment for edentulous maxilla. Implant-retention/support overdenture shows better retention and stability than complete denture and is less expensive and more esthetic than implant-supported fixed prosthesis. CM $LOC^{(R)}$ $Pekkton^{(R)}$ attachment is a solitary type attachment and evaluated to have excellent abrasion resistance and retention with a female part made of poly-ether-ketone-ketone. Meanwhile, SR Ivocap system is injection molding method and discussed to show few changes in the vertical dimension of denture and have excellent fracture resistance. In this case, we restored maxillary arch with a four implant-retained overdenture using CM $LOC^{(R)}$ $Pekkton^{(R)}$ and SR Ivocap system, and mandibular arch with a removable partial denture. Through this procedure, satisfactory outcomes were achieved both in functional and esthetic aspects.