• Title/Summary/Keyword: stainless steel crown

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TREATMENT OF ECTOPIC ERUPTING MANDIBULAR FIRST PERMANENT MOLAR CAUSED BY IMPROPERLY RESTORED STAINLESS STEEL CROWN : CASE REPORT (부적절하게 수복된 stainless steel crown에 의해 야기된 하악 제1대구치 이소맹출의 치험례)

  • Park, Chu-Seok;Choi, Byung-Jai;Sohn, Heung-Kyu
    • Journal of the korean academy of Pediatric Dentistry
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    • v.27 no.1
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    • pp.98-102
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    • 2000
  • Ectopic eruption is out of a normal position by local eruption disturbance in the developing permanent molar. The prevalence of ectopic eruption is reported to be the between 2 and 6%, most often associated maxillary first permanent molar whereas, the occurrence for the mandibular is quite rare. The etiologic factors of ectopic eruption are inadequate arch length, lack of growth in the posterior region of the jaw, mesially inclined eruption path of first permanent molars, abnormally large first permanent molars, hereditary factor and a stainless steel crown which has been improperly restored. Ectopic eruption can be treated by the use of brass wire, separating elastics, distal disking and Humphrey appliance and the use of removable appliance and cervical traction headgear after extraction of the second primary molar. This case was that lower right first permanent molar was mesially tilted state by locking on the stainless steel crown of a lower right second primary molar. The stainless steel crown was removed and Humphrey appliance was set. Like this case, ectopic eruption could be happened by the stainless steel crown which improperly restored. In restoration of the stainless steel crown, selection of proper size, trimming and contouring are very important.

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A CASE REPORT ON PRIMARY INCISOR TREATMENT USING OPEN-FACE STAINLESS STEEL CROWN (Open-face Stainless Steel Crown을 이용한 유전치의 치료에 대한 증례보고)

  • Kim, Jong-Min;Choi, Hyung-Jun;Lee, Jae-Ho;Choi, Byung-Jae
    • Journal of the korean academy of Pediatric Dentistry
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    • v.24 no.4
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    • pp.781-787
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    • 1997
  • In spite of the improvements of the techniques in the field of preventive dentistry, many children still present with extensive destruction of primary anterior teeth. Not only the practioner must consider the pulp state of the primary incisor, but also restore the form, function and esthetics of the tooth. Restorative treatment of primary incisor tooth requires durability, retention and esthetics. Stainless steel crowns used in restoring primary anterior teeth is retentive and durable in comparison with the composite resin, celluloid crown. But they are not esthetic. To enhance the esthetics of the anterior stainless steel crown without reducing its superior retention, an open-face stainless steel crown has been suggested. Several authors have suggested cutting away the labial portion of the stainless steel crown and placing the composite resin in that area. By following this technique, the practioner can prepare a retentive, durable, and esthetic restoration for primary teeth which have suffered from extensive loss of teeth structure. In addition, the single missing primary anterior teeth can be successfully restored by soldering the stainless steel crown together. Open-face stainless steel crown is indicated in the areas of large interproximal lesions involving incisal edge, crown fracture with pulp exposure and congenital malformation of the teeth. By this technique, the practioner can restore primary anterior teeth successfully regardless of the amount of remaining tooth structure, bruxism habit and presence of attrition. In this case, rampant caries with extensive loss of tooth structure and single missing of primary anterior tooth hart been successfully treated with open-face stainless steel crown.

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FULL COVERAGE RESTORATION OF PRIMARY ANTERIOR TEETH : A CASE REPORT (유전치의 전장피개수복 : 증례보고)

  • Hong, Kee-Sang;Jang, Ki-Taeg;Lee, Sang-Hoon
    • Journal of the korean academy of Pediatric Dentistry
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    • v.26 no.2
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    • pp.240-247
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    • 1999
  • Primary anterior teeth requiring extensive restorative therapy due to caries, trauma or developmental defects can present a particularly challenging problem for the pediatric dentist. The ideal restorative technique would combine strength, durability esthetics and efficiency in placement. Couple these concerns with the technical difficulties of operating on children with behavior management problems, and the dentist is left with the difficult task of choosing from a variety of restorative options. Restorative modalities currently in use to treat primary anterior teeth include bonding with composite resin as in celluloid strip crowns, conventional stainless steel crowns, open-faced stainless steel crowns, commercially and chairside veneered stainless steel crowns and epoxy-coated stainless steel crowns. Each of these techniques presents technical, functional or esthetic compromises that complicate their efficient and effective usage. This is a report of the results obtained at the Department of Pediatric Dentistry, College of Dentistry Seoul National University, through the use of these various methods of treating primary anterior teeth.

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A COMPARISON OF THE BOND STRENGTHS BETWEEN SOME CEMENTS AND STAINLESS STEEL MATERIAL (Stainless steel crown을 위한 수종 시멘트의 접착력 비교)

  • Kim, Hong-Ryoul;Jeong, Tae-Sung;Kim, Shin
    • Journal of the korean academy of Pediatric Dentistry
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    • v.26 no.3
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    • pp.528-537
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    • 1999
  • The purpose of this study was to analyze and compare the bond strengths between stainless steel plate and zinc phosphate cement, polycarboxylate cement and glass ionomer cement, which are frequently used for cementation of stainless steel crowns. Three cementing materials were glued to the poles standing above stainless steel plate, bovine teeth, light cured glass ionomer restorative material and amalgam. And the tensile bond strengths between them were measured with universal testing machine and the results were statistically processed using ANOVA and Student t-test. The obtained results were as follows : 1. On stainless steel plate, glass ionomer cement and polycarboxylate cement showed higher tensile bond strengths compared to zinc phosphate cement, with no significant difference between the former two. 2. On the surface of bovine teeth and glass ionomer restorative material, glass ionomer cement showed highest bond strength, followed by polycarboxylate cement and zinc phosphate cement in order. 3. For amalgam restoration, polycarboxylate cement and glass ionomer cement showed higher tensile bond strengths than zinc phosphate cement, with no significant difference between the former two.

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EVALUATION OF CONSERVATIVE TREATMENT BETWEEN AMALGAM FILLING AND STAINLESS STEEL CROWN IN PRIMARY TEETH. (乳齒(유치)에 있어서 Stainless steel crown Amalgam과 充塡(충전)과의 비교연구(比較硏究))

  • Woo, Won-Sup
    • Journal of the korean academy of Pediatric Dentistry
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    • v.4 no.1
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    • pp.35-38
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    • 1977
  • The study was performed to evaluate effects of Conservative treatment between amalgam filling and stainless steel crown. The selected subjects for this study was 350 children who have amalgam filling or stainless steel crown. The obtained results are as followings. 1. In amalgam filling teeth, 120 teeth (60.0%) showed marginal leakage, 57 teeth (28.5%) showed fracture of filling material and 28 teeth (14.0%) teeth showed periapical lesion. 2. In crowned teeth, 6 teeth (3.0%) showed hole on the surface of crown, 29 teeth (14.5%) showed avulsion of crown and 10 teeth (5.0%) showed periapical lesion. 3. After 12 months from examining date, 69 teeth (34.5%) showed sound condition in amalgam filling teeth and 155 teeth (75.2%) showed sound condition in crowned teeth.

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CLINICAL EVALUATION OF VENEERED STAINLESS STEEL CROWN RESTORATION BY SILICOATER TECHNIQUE : CASE REPORT (Silicoater technique을 이용한 veneered stainless steel crown수복의 임상적 평가)

  • Jeong, Youn-Hwa;Kim, Wang-Kwen;Lee, Chang-Seop;Lee, Sang-Ho
    • Journal of the korean academy of Pediatric Dentistry
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    • v.26 no.1
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    • pp.103-108
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    • 1999
  • Restoration of severly carious, malformed or traumatically fractured primary incisors is one of the most difficult challenges in restorative dental care for preschoolers. In restoring primary anterior teeth, four types of complete coverage crowns have been attempted over the years. Stainless steel crowns, open-faced stainless steel crowns, acid-etched crowns(strip crowns), and preformed polycarbonate crowns have been the choices. While these restorations have been acceptable for many patients, they all have very distinct limitations. The ideal full coronal restoration for a primary incisor requires durability, retention, and esthetics. This paper reported veneered stainless steel crown restoration of primary anterior teeth by silicoater technique. Veneered stainless steel crown restoration by silicoater technique is considered to be a durable, retentive, and esthetic restoration.

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Comparison Study for the Shear Strength of the Bondings between Stainless Steel Crown/Direct Type Composite Resin and Stainless Steel Crown/Indirect Type Composite Resin (치과 치료학에서 적용되는 접합기술 연구 ; 스테인리스강 크라운에 접합된 직접용 콤포짓트 레진과 간접용 콤포짓트 레진의 전단결합강도 비교)

  • Kim, Gwang-Soo;Baek, Kwang-Woo
    • Journal of Welding and Joining
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    • v.29 no.4
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    • pp.93-99
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    • 2011
  • This study was performed to compare the shear strength of the bondings between stainless steel crown/direct type composite resin and stainless steel crown/indirect type composite resin. Four groups of bonding conditions were prepared. Two groups of bonding conditions were made by the indirect type composite resin system and the other two groups were made by the direct type composite resin system. The shear strength tests were carried out using universal testing machine, Model 4465 of Instron Co.. It was indicated that the bond strength values of the indirect type composite resins were higher than those of the direct type composite resins. TE-SE group was superior to the TE-ONE in indirect type resin system. These results were thought to be the high degree of the polymerization accompanied with temperature and pressure of the resin of indirect type resin. It was also found that indirect composite resin contains less amount of porosity in resin.

CHANGES IN ROOT CANAL CONFIGURATION USING DIFFERENT FILE TYPES AND TECHNIQUES (근관형성 기구 및 방법에 따른 근관 형태의 변화)

  • Huh, Young-Ju;Kim, Sung-Kyo
    • Restorative Dentistry and Endodontics
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    • v.22 no.1
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    • pp.291-304
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    • 1997
  • The purposes of this study were to evaluate the changes in root canal configuration with canal instrumentation using different file types and techniques and to investigate most appropriate instrumentation technique in maintaining the original canal configuration with different file types. Fifty curved mesiobuccal or distobuccal canals of extracted human maxillary molar teeth were instrumented using a step-back technique with stainless steel K-files or nickel-titanium K-files, a crown-down pressureless technique with stainless steel K-files or nickel-titanium K-files and nickel-titanium engine-driven files. Radiographs were taken before and after instrumentation using a specially designed device that allowed for the pre-and postinstrumentation canals to be taken with the same X-ray angulation. Magnified X-ray images on a magnifier screen were traced and post instrumentation canal images were compared with the preinstrumentation ones. Changes in canal curvature and the incidence of procedural accidents were analyzed. The results were as follows : Crown-down pressureless technique with nickel-titanium K-files and nickel-titanium engine-driven filing produced no significant changes in canal curvature (p>0.05), while the step-back technique with stainless steel K-files or nickel-titanium K-files (p<0.01) and the crown-down pressureless technique with stainless steel K-files (p<0.05) produced significant changes. With nickel-titanium K-file, crown-down pressureless technique produced significantly less changes in canal curvature than step-back technique (p<0.05), while there was no significant difference between techniques with stainless steel K-files (p>0.05). File types exerted no significant influences in the changes of canal curvature both in the step-back technique and crown-down pressureless technique (0>0.05). Regardless of the file types used, step-back technique produced more procedural accidents such as ledge or elbow formation, apical zipping and apical transportation than the crowndown pressureless technique and nickel-titanium engine-driven filing. Both with stainless steel K-files and with nickel-titanium K-files, the incidence of apical extrusion of canal debris was higher in step-back technique than in crown-down pressureless technique.

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A Morphometric Study of the Stainless Steel Permanent Molar Crown with Three-Dimensional Scanner (3차원 스캐너를 이용한 대구치용 기성금속관의 형태에 관한 계측학적 연구)

  • Shin, Jonghyun;Lee, Hyeongjik;Jeong, Taesung;Kim, Shin;Kim, Jiyeon
    • Korean Journal of Dental Materials
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    • v.45 no.4
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    • pp.287-300
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    • 2018
  • The aim of this study was to compare the morphological characteristics of two types of stainless steel permanent molar crowns using three-dimensional scanners and the morphological changes of these crowns after crimping. Two types of stainless steel permanent molar crowns, PO-96 and PERMACROWN were scanned using three-dimensional scanner. Crown size, crown index (ratio of buccolingual diameter to mesiodistal diameter at height of contour), cervical convergency of crown were measured. Stainless steel crowns were crimped and re-scanned with three-dimensional scanner. Morphological changes of stainless steel permanent molar crowns were analyzed. As for the crown index, maxillary PERMACROWN was larger buccolingually and smaller mesiodistally than maxillary PO-96 and mandibular PERMACROWN was smaller buccolingually and larger mesiodistally than mandibular PO-96. Maxillary PO-96 was more convergent to cervical mesiodistally than maxillary PERMACROWN and mandibular PO-96 was more convergent to the cervical mesiodistally, buccolingually than mandibular PERMACROWN. Both types of stainless steel permanent molar crowns showed reduction of cervical circumference after crimping. Two products were morphologically different in crown size, shape and cervical convergence. Although both types of stainless steel permanent molar crowns are pre-contoured type, additional crimping is needed to achieve better marginal adaptation.

Survival rate of stainless steel crown restorations according to depth of caries in primary molars (유구치에서 우식의 깊이에 따른 기성 금속관 수복물 생존율 연구)

  • Yoo, Hyunkyoung;Ra, Jiyoung;Lee, Jewoo
    • The Journal of the Korean dental association
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    • v.57 no.10
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    • pp.569-578
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    • 2019
  • The purpose of this retrospective study was to compare outcome of preformed stainless steel crown restorations according to depth of caries in primary molars. The study subjects consisted primary molars having dentin caries extending at least one-fourth of dentin without signs and symptoms of irreversible pulpitis. A total 295 primary molars received preformed stainless steel crown restorations without any base materials were included in this study. Survival rates were compared using a Kaplan-Meier analysis test. There was no significant difference between depth of caries and survival period in primary molars. And also there was no significant difference with or without pulp therapy. The results of this study suggest that neither the amount of caries nor pulp therapy affect the survival period of primary molars significantly. Proper restoration is more important to achieve sealing for stopping caries progression.

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