• Journal of Oral Medicine and Pain
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• 제34권3호
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• pp.277-294
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• 2009

본 연구의 목적은 II급 청소년, 성인 환자에서 발치와 비발치 후 연조직 변화를 비교하기 위한 것이었다. 원광대학교 치과병원 교정과에 내원한 환자 68명을 각각 청소년발치군, 청소년비발치군, 성인발치군, 성인비발치군으로 분류하여 치료 전후의 측모 두부방사선사진을 계측하였다. 각 군의 치료 전후를 비교하고 각 군 간의 변화량을 비교하였으며, 그 중 통계적으로 유의한 변수들의 상관성과 회귀분석을 하여 다음과 같은 결과를 얻었다. 청소년과 성인의 발치군에서 비순각은 유의하게 증가하였고 비발치군에서는 유의하게 감소하였다. 발치군에서는 vertical-U1과 E line-upper lip의 변화량 간에, vertical-U1과 E line-lower lip의 변화량 간에, vertical-L1과 vertical-Li의 변화량 간에 양의 상관관계를 보였다. 또한 발치군에서 회귀분석을 통해 E line-upper lip, E line-lower lip, Li에 대한 단순회귀방정식이 도출되었다.

• 대한치과교정학회지
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• 제49권2호
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• pp.116-123
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• 2019

As an alternative to the conventional fixed appliance that uses orthodontic brackets, a simple round tube without a bonding base can be bonded to the tooth surface by covering the tube with flowable resin. In this technique, bent wires cannot be inserted into the simple tubes; therefore, repositioning of the simple tubes is often required for adjustments. To reduce repositioning of simple tubes, a dome-shaped resin covering of the simple tube can be designed with a customized in-and-out compensation, using three-dimensional computer-aided design software based on digital simulation of orthodontic tooth movement. In the present case, the use of simple tubes bonded with customized resin coverings in a Class I nonextraction case is described in a 17-year-old male, in whom moderate crowding of the anterior teeth was treated over an 8-month period. This case shows that simple tubes can be used as an alternative to brackets in some Class I nonextraction cases, with the potential benefit of reducing decalcification.

• 대한치과교정학회지
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• 제40권3호
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• pp.176-183
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• 2010

고정식 교정장치를 이용한 교정치료 후 교합의 기능적 변화를 평가하기 위해, 교합력 및 교합접촉면적을 측정하여 단기적인 변화 양상을 확인하고 소구치 발치 여부에 따른 차이를 파악하였다. 고정식 교정장치로 치료를 종료한 18세 에서40세 사이의 성인을 남자군과 여자군으로 분류하고, 각각의 군을 4개의 소구치를 발치한 군과 비발치로 치료한 군으로 세부 분류하였다(남자발치군 16명, 남자비발치군 18명, 여자발치군 19명, 여자비발치군 21명). Dental prescalesystem (Fuji Film Corp., Tokyo, Japan)의 pressure sensitive sheet를 5초간 최대교두감합위에서 최대근력으로 교합하도록 한 뒤 CCD camera를 이용해 교합력과 교합면적을 측정하였다. 고정식 교정장치를 제거하고 고정식유지장치를 붙인 직후, 교정장치 제거 1주일, 1개월, 3개월, 6개월, 1년 뒤에 각각 측정하여 비교하였다. 모든 군에서 교정장치 제거 후 1년간의 유지기간 동안 교합력과 교합면적은 점진적으로 증가하였다 (p < 0.05). 모든 측정 시기에서 남자군은 여자군보다 높은 교합력과 교합면적을 보였으며 (p < 0.05), 남자, 여자군 모두에서 발치군과 비발치군 사이에는 교합력 및 교합면적에서 통계적으로 유의한 차이가 관찰되지 않았다 (p > 0.05). 본 연구를 통해 교정치료 후 1년간의 유지기간 동안 교합이 기능적으로 향상됨을 파악하였고, 소구치 발치로 인한 교합의 기능적 저하는 없을 것이라 추측할 수 있었다.

• 대한치과교정학회지
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• 제27권1호
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• pp.79-89
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• 1997

이 연구는 제1급 총생치 부정교합자를 비발치로 치료한 후, 교정치료개시기에서부터 보정완료 후까지 장기간의 변화를 관찰하여 치열의 양적 변화와 그경향을 이해하기 위하여 시행되었다. 연구자료는 26명에 대한 교정치료개시, 교정치료 직후 빛 보정종료까지의 일련의 석고모형과 두부엑스선규격사진이었으며, 이들을 계측하고 분석하여 다음의 결과와 결론을 얻었다. 1. 수직부피개의 재귀량은 치료량과 상관성이 있었다. 2. 상악견치간 폭경은 치료직후 확대된 증례에서는 안정성이 있었으나 감소된 증례에서는 재귀율이 컸다. 3. 하악견치간폭경은 치료직후 확대 혹은 축소에 관계없이 재귀율이 높았다. 4. 상하악 전치는 치료직후 순측경사를 보였고, 보정기간동안에 안정성이 있었다. 5. 치료직후 상하악 제1대구치는 대체로 원심경사하였으며 보정기간중에 원래의 위치로 재귀하였으며, 대구치간 폭경은 치료직후 약간 확대되어 보정기간중에 안정성을 보였다. 6. 비발치 치료증례의 보정은 하악 견치간 폭경의 유지에 유의하여야 하며, 하악치열궁의 확대는 해당악골의 생리적한계내에서 이루어져야 할것으로 생각된다.

• 대한치과교정학회지
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• 제50권4호
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• pp.290-290
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• 2020

• 대한치과교정학회지
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• 제48권4호
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• pp.224-235
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• 2018

Objective: The purpose of this study was to compare the skeletal, dental, and soft-tissue treatment effects of nonextraction therapy using the modified C-palatal plate (MCPP) to those of premolar extraction (PE) treatment in adult patients with Class II malocclusion. Methods: Pretreatment and posttreatment lateral cephalographs of 40 adult patients with Class II malocclusion were retrospectively analyzed. The MCPP group comprised 20 patients treated with total arch distalization of the maxillary arch while the PE group comprised 20 patients treated with four PE. Fifty-eight linear and angular measurements were analyzed to assess the changes before and after treatment. Descriptive statistics, paired t-test, and multivariate analysis of variance were performed to evaluate the treatment effects within and between the two groups. Results: The MCPP group presented 3.4 mm of retraction, 1.0 mm of extrusion, and $7.3^{\circ}$ lingual inclination of the maxillary central incisor. In comparison, the PE group displayed greater amount of maxillary central incisor retraction and retroclination, mandibular incisor retraction, and upper lip retraction (5.3 mm, $14.8^{\circ}$, 5.1 mm, and 2.0 mm, respectively; p < 0.001 for all). In addition, the MCPP group showed 4.0 mm of distalization and 1.3 mm of intrusion with $2.9^{\circ}$ distal tipping of the maxillary first molars. Conclusions: These findings suggest the MCPP is an effective distalization appliance in the maxillary arch. The amount of incisor retraction, however, was significantly higher in the PE group. Therefore, four PE may be recommended when greater improvement of incisor position and soft-tissue profile is required.

• 대한치과교정학회지
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• 제47권2호
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• pp.100-107
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• 2017

Objective: To analyze the long-term changes in maxillary arch widths and buccal corridor ratios in orthodontic patients treated with and without premolar extractions. Methods: The study included 53 patients who were divided into the extraction (n = 28) and nonextraction (n = 25) groups. These patients had complete orthodontic records from the pretreatment (T1), posttreatment (T2), and postretention (T3) periods. Their mean retention and postretention times were 4 years 2 months and 17 years 8 months, respectively. Dental models and smiling photographs from all three periods were digitized to compare the changes in three dental arch width measurements and three buccal corridor ratios over time between the extraction and nonextraction groups. Data were analyzed using analysis of variance tests. Post-hoc multiple comparisons were made using Bonferroni correction. Results: Soft-tissue extension during smiling increased with age in both groups. The maximum dental width to smile width ratio (MDW/SW) also showed a favorable increase with treatment in both groups (p < 0.05), and remained virtually stable at T3 (p > 0.05). According to the MDW/SW ratio, the mean difference in the buccal corridor space of the two groups was $2.4{\pm}0.2%$ at T3. Additionally, no significant group ${\times}$ time interaction was found for any of the buccal corridor ratios studied. Conclusions: Premolar extractions did not negatively affect transverse maxillary arch widths and buccal corridor ratios. The long-term outcome of orthodontic treatment was comparable between the study groups.

• 대한치과교정학회지
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• 제52권3호
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• pp.210-219
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• 2022

Objective: The purpose of this study was to examine the effectiveness and mechanism of clear aligner therapy for the correction of anterior open bite in adult nonextraction cases. Methods: Sixty-nine adult patients with anterior open bite were enrolled and classified into Angle's Class I, II, and III groups. Fifty patients presented with skeletal open bite (mandibular plane angle [MPA] ≥ 38°), whereas 19 presented with dental open bite. Fifteen cephalometric landmarks were identified before (T1) and after (T2) treatment. The magnitudes of planned and actual movements of the incisors and molars were calculated. Results: Positive overbite was achieved in 94% patients, with a mean final overbite of 1.1 ± 0.8 mm. The mean change in overbite was 3.3 ± 1.4 mm. With clear aligners alone, 0.36 ± 0.58 mm of maxillary molar intrusion was achieved. Compared with the Class I group, the Class II group showed greater maxillary molar intrusion and MPA reduction. The Class III group showed greater mandibular incisor extrusion with no significant vertical skeletal changes. Conclusions: Clear aligners can be effective in controlling the vertical dimension and correcting mild to moderate anterior open bite in adult nonextraction cases. The treatment mechanism for Class III patients significantly differed from that for Class I and Class II patients. Maxillary incisor extrusion in patients with dental open bite and MPA reduction with mandibular incisor extrusion in patients with skeletal open bite are the most significant contributing factors for open bite closure.

• 대한치과교정학회지
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• 제18권2호
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• pp.475-488
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• 1988

Certain malocclusion are associated with specific "facial type," and it is important for the clinician to classify the common facial characteristic of each patient. Because the reaction to treatment mechanics and the stability of the denture is depended upon the analysis of the facial pattern. Basically, there are 3 district facial types or patterns under which almost all malocclusion can be classified. 1. mesofacial is the most average growth. 2. brachyfacial which is a horizontal growth pattern has a week muscle, with dental arch, deep bite. 3. dolichofacial which is a vertical growth pattern has a strong muscle, narrow dental arch, open bite. Brachyfacial pattern show a resistant to mandibular rotation during treatment can accept a more protrusive denture and are prominantly nonextraction, whereas dolichofacial patterns tend to open during treatment require a more retracted denture in order to assure post-treatment stability. Brachyfacial pattern would better treat to use extrusive force system, whereas dolichofacial pattern treat to use intrusive force system with head gear and intermaxillary elastics.

• 대한치과교정학회지
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• 제50권1호
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• pp.52-62
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• 2020

This case report presents the orthodontic treatment of a 25-year-old patient with skeletal Class II and severe maxillary arch crowding, moderate mandibular arch crowding, anterior crossbite, and a missing lower incisor. He was treated with molar distalization using a modified C-palatal plate and temporary anchorage devices to create sufficient space for retraction. The total treatment duration was 21 months. After treatment, his occlusion and smile esthetics showed significant improvement. The modified C-palatal plate represents a treatment modality that enhances the prospects of non-extraction treatment and reduces the need for extraction.