• Title/Summary/Keyword: 제2소구치 발거

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ERUPTION GUIDANCE OF IMPACTED SECOND PREMOLAR TOOTH BY EXTRACTION OF PROLONGED RETAINED SECOND PRIMARY MOLAR. (만기 잔존된 제 2 유구치 발거에 의한 제 2 소구치의 자발적 맹출 유도)

  • Lee, Keun-Hye;Nam, Dong-Woo;Kim, Hyun-Jung;Kim, Young-Jin;Nam, Soon-Hyeun
    • Journal of the korean academy of Pediatric Dentistry
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    • v.30 no.3
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    • pp.495-501
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    • 2003
  • Impaction is defined as the cessation of the eruption of the tooth caused by a clinically or radiographically detectable physical barrier in the eruption path or by the ectopic position of tooth germ. Besides the third molars and the maxillary canines, the most common impacted tooth is the second premolar. The overall frequency of premolar impaction has been reported to be 0.5%. In some cases, orthodontic traction and surgical repositioning may be indicated. When impacted second premolar is involved with prolonged retained second primary molar, extraction of primary molar and space maintenance lead to eruption of second premolar. In these cases, all patients visited to department of pediatric dentistry of Kyungpook National University Hospital for the chief complaint of unerupted second premolar. Extraction of prolonged retained second primary molar and space management are tried for spontaneous eruption of impacted second premolar tooth. The results were as follows: 1. When impacted second premolar is involved with prolonged retained second primary molar, minimal treatment via elimination of primary molar leads to successful results. 2. Proper space management and periodic radiographic examination are required before eruption of second premolar. 3. Sufficient time must be allowed for confirm of tooth movement before orthodontic traction or surgical repositioning. 4. The result is more successful in incomplete root development.

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Upper and lower second premolar extraction treatment case - Treatment strategy for Class III borderline cases (상하악 제2소구치 발거 치료 증례 - III급 부정교합 경계증례의 치료전략)

  • Kim, Tae-Kyung;Kim, Jong-Tae;Yang, Won-Sik
    • The korean journal of orthodontics
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    • v.32 no.3 s.92
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    • pp.185-194
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    • 2002
  • When treating borderline cases which have mild crowding, non-extraction treatment may be considered firstly. But crowding may be reappeared by relapse and it may have problems in esthetics and stability. Secondarily four first premolar extraction treatment may be considered. But this may cause dish-in face by overretracting anterior teeth. In this cases, extraction of four second premolar is preferred because this resolves crowding without aggravating profile and has good stability after treatment. So we review cases treated by four second premolar extraction which show good treatment results and stability. The patients had good profile, Class I molar relationship, mild crowding and skeletal discrepancy and their growth had almost completed.

Eruption Guidance of Distally Displaced Mandibular Second Premolar by the Hemisection of Primary Second Molar: Two Case Reports (선행 유치의 편측치아절제술에 의한 원심으로 변위된 하악 제2소구치의 맹출 유도)

  • Yongwook, Shin;Howon, Park;Juhyun, Lee
    • Journal of the korean academy of Pediatric Dentistry
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    • v.49 no.3
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    • pp.340-347
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    • 2022
  • Distal displacement of the tooth germ of the mandibular second premolar (MnP2) leads to its impaction and obturation of the eruption path of the mandibular first molar delaying its eruption. The present case report describes the treatment of 2 cases of eruption guidance for distally displaced developing MnP2 that caused delayed eruption of the mandibular first molar. Intentional extraction of primary predecessor results in the mesial shift of the displaced MnP2. However, unfavorable distal ectopic eruption of the mandibular first premolar after the premature loss of primary second molar has been previously reported. Hemisection and sequential extraction of the mandibular primary second molar were performed to mesially shift the distally displaced MnP2, while preventing unfavorable distal ectopic eruption of the mandibular first premolar.

A STUDY ON THE PRE-ERUPTIVE POSITIONAL CHANCE OF THE LOWER THIRD MOLAR FOLLOWING ORTHODONTIC TREATMENT (교정치료에 따른 미맹출 하악 제3대구치의 위치 변화에 관한 연구)

  • Lee, Kyoung-Won;Bae, Seong-Ryol;Kim, Sang-Cheol
    • The korean journal of orthodontics
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    • v.26 no.1 s.54
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    • pp.105-111
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    • 1996
  • Most of orthodontic cases are treated with extraction of certain teeth, which influence the pre-eruptive movement of the lower third molar The purpose of this study was to evaluate the positional change of lower third molar following orthodontic treatment. Pre- and post-treatment pantomograms of 163 orthodontic patients (77 nonextraction group, 78 first premolar- extraction group, 8 second molar- extraction group) were analyzed in terms of the mesiodistal and buccolingual angles of lower third molar. The results were as follows. 1. The change of the mesiodistal angle of lower third molar by orthodontic treatment was significant in second molar-extraction group. 2. The mesiodistal angle of lower third molar in pre-treatment was significantly correlated to the mesiodistal angle in post-treatment and/or the change of the mesiodistal angle by treatment. 3. The change of the buccolingual angle of lower third molar by orthodontic treatment was significant in non -extraction group or first premolar-extrction group. 4. The change of the buccolingual angle of lower third molar by treatment was significantly correlated to the mesiodistal angle in post-treatment, the change of the mesiodistal angle by treatment, the buccolingual angle in pre-treatment or the buccolingual angle in post-treatment.

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Additional Root of the Primary Maxillary Second Molar Possibly Associated with Displacement and Rotation of the Permanent Successor : Two Case Reports (상악 제2유구치의 부가치근과 함께 관찰된 영구 계승치의 변위 및 회전 : 증례 보고)

  • Ku, Jaewon;Lee, Jewoo;Ra, Jiyoung
    • Journal of the korean academy of Pediatric Dentistry
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    • v.44 no.1
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    • pp.116-121
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    • 2017
  • An additional root of the primary maxillary second molar is rarely observed. Two cases are presented herein, and we discuss a possible association between additional root of the primary maxillary second molar and displacement and rotation of the permanent successor. Investigation of crown morphology enables the detection of a potential additional root of the primary maxillary second molar, and eruption of the permanent successor needs to be examined carefully if an additional root is present. Early extraction of primary molar and space maintenance can be used as a conservative treatment if the premolar germ shows an abnormal eruption pattern.

AUTOTRANSPLANTATION OF A MALPOSITIONED MANDIBULAR SECOND PREMOLAR : A CASE REPORT (이소매복된 하악 제2소구치의 자가치아이식을 이용한 치험례)

  • Chung, Youn-Joo;Koong, Hwa-Soo;Choi, Sung-Chul;Kim, Kwang-Chul;Park, Jae-Hong
    • Journal of the korean academy of Pediatric Dentistry
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    • v.36 no.4
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    • pp.591-596
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    • 2009
  • In the case of the impacted teeth, the clinician has to consider development of tooth, site of impaction, eruption path, and cooperation of patient. Treatment options for the management of impacted teeth are separated into four categories: observation, intervention, orthodontic or surgical relocation and extraction. Autotransplantation may be defined as the transplantation of embedded, impacted or erupted teeth, from one site to another in the same individual into extraction site or surgically prepared sockets. Autotransplantation ensures preservation of natural tooth, induction of alveolar bone growth and root development, offers one of the fastest and most economically feasible means in the replacement of young patients' missing teeth. This case presents a malpositioned impacted mandibular premolar of an 11-year-old girl. It was thought that orthodontic traction was difficult because of its unfavorable impacted position. Therefore the tooth was treated by autotransplantation, we can observe good healing pattern during 12 months.

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A study of the arch length discrepancy and the diagnostic analysis (치열궁내 공간 부조화와 진단적 평가에 관한 연구)

  • Ryu, Young-Kyu;Ahn, Kwang-Seok
    • The korean journal of orthodontics
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    • v.34 no.1 s.102
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    • pp.1-11
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    • 2004
  • Predicting the arch length discrepancy by simply comparing the available arch perimeter with tooth materials is merely a 2-dimensional analysis of the teeth movement. However, the real teeth movement takes place 3-dimensionally and is affected by various factors such as, the arch fen the curve of Spee and the axis of the incisors. The purpose of this study is to clarify the relationship between the decrease in the arch perimeter and the horizontal positional change of the incisors after extraction of the 1st bicuspids, for more analytic evaluation of the arch length discrepancy at pre-treatment model analysis stage. In addition to that to evaluate the effect of the curve of Spee, teeth axis to the basal plane, and the incisional crowding to the treatment outcome. All patients were treated at the department of orthodontics, dental hospital, Yonsei university. Inclusion criteria for patients selection were as follows. $\cdot$ Angle classification I malocclusion with bialveolar protrusion $\cdot$ Extraction of 4 1st bicuspids $\cdot$ No tooth anomaly or prosthesis $\cdot$ No abnormal attrition $\cdot$ No ectopically erupted teeth $\cdot$ Angle classification I canine and molar relationship $\cdot$ Less than 3mm of crowding Model analysis of the above patients was performed and the following conclusions were obtained. 1. When the intercanine distance was maintained, the available space for the distal movement of the mandibular incisors after the extraction of the 4 1st bicuspids was larger than the space provided by the extraction of the 4 1st bicuspids. However the difference was less than 1mm. The more tapered the anterior arch form, the larger the difference. 2. Compared to the situation in which the intercanine distance was maintained, when the intercanine distance was expanded to meet the width of the Posterior teeth, the incisors could move about 3mm more distally. 3. The positional difference of the incisal tip was insignificant whether the central incisors were moved by tipping or bodily movement. 4. When the anterior crowding was solved without changing the intercanine distance, the larger the anterior arch length was, the more the anterior movement of the incisors. 5. When the curve of Spee was levelled, the increase in the arch perimeter was less than half of the deepest curve of Spee.

UNERUPTED PRIMARY MOLARS (미맹출 유구치의 치험례)

  • Kang, Sun-Hee;Yang, Young-Sook;Lee, Kwang-Hee
    • Journal of the korean academy of Pediatric Dentistry
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    • v.32 no.2
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    • pp.217-223
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    • 2005
  • The term 'impaction teeth' is used to designate a tooth which remains unerupted in jaw beyond the time at which it should normally be erupted. Most cases of impacted teeth reported in the literature are permanent teeth. The impaction of primary teeth occur rarely whereas impaction of second primary molars is more numerous than all other impactions. Failure of eruption of primary teeth may cause a number of complications, such as interference with development and eruption of successive permanent teeth, malocclusion, cystic change of tooth follicle. The clinican should consider the various treatment option available (a) No treatment and observation, (b) surgical extraction (c) space regainer. Proper treatment plan should be established after thought consideration of impacted tooth and it's relation with successive permanent tooth.

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ORTHODONTIC TREATMENT OF IMPACTED MAXILLARY INCISOR : A CASE REPORT (매복된 상악 전치의 교정적 치료 : 증례보고)

  • Kim, Hae-Ri;Oh, So-Hee;Kim, Young-Hee
    • Journal of the korean academy of Pediatric Dentistry
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    • v.34 no.4
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    • pp.709-717
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    • 2007
  • Impaction of maxillary incisor is rare than the third molar and canine, but its rate is higher than the other anterior teeth due to frequent mesiodens, trauma and variation of root formation (root dilaceration etc.). It is often observed in the dental age of about eight years and over. It will be occurred that the space loss, midline deviation and cyst formation due to the impaction of maxillary incisor. So it is important to evaluate the precise location of impacted tooth and to make appropriate treatment plan. Treatment would be surgical extraction or expectation for spontaneous eruption. If the impacted tooth has no pathologic change and development of the root is favorable, orthodontic traction is recommended for recovery of function and esthetics. In these cases, we performed orthodontic traction for the eruption of impacted maxillary incisors, and obtained satisfactory results.

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