• 대한치과교정학회지
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• 제49권6호
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• pp.381-392
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• 2019

Objective: The objective of this two-arm parallel trial was to compare the type of tooth movement during en masse retraction of the maxillary anterior teeth using labial versus lingual biocreative therapy. Methods: Twenty-eight subjects were randomized in a 1 : 1 ratio to either the labial or lingual group. En masse anterior retraction was performed using labial biocreative therapy in group A and lingual biocreative therapy in group B. Cone beam computed tomography scans were taken before and after retraction and the primary outcome was the type of tooth movement during anterior retraction. Data were analyzed using paired t-tests for comparisons within each group and independent-sample t-test for comparison of the mean treatment changes between the two groups. Results: Significant differences were found between the two groups in relation to the type of tooth movement (labiolingual inclination of the central incisor; mean difference, $5.85{\pm}1.85^{\circ}$). The canine showed significant distal tipping in the lingual group (mean difference, $6.98{\pm}1.25^{\circ}$). The canine was significantly more intruded in the lingual group (mean difference, $1.67{\pm}0.49mm$). Good anchorage control and significant soft tissue changes occurred in both groups. No serious adverse effects were detected. Conclusions: With a 10-mm retraction hook, the labial biocreative technique with the reverse curve overlay provided anterior retraction with good torque control, while in the lingual group, anterior retraction occurred with controlled tipping movement with significant distal tipping and intrusion of the canine (trial registration: The trial was registered at ClinicalTrials.gov [NCT03239275]).

• 대한치과교정학회지
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• 제51권3호
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• pp.157-165
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• 2021

Objective: This study aimed to identify the clinical effectiveness of two different penetration depths of micro-osteoperforations (MOPs) on the rate of orthodontic tooth movement. Methods: Twenty-four patients requiring the removal of the upper first premolar teeth were selected and randomly divided into two groups. The control group participants did not undergo MOPs. Participants in the experimental group underwent three MOPs each at 4-mm (MOP-4) and 7-mm (MOP-7) depths, which were randomly and equally performed to either the left or right side distal to the canine. The retraction amount was measured on three-dimensional digital models on the 28th day of retraction. MOP-related pain was measured using a visual analog scale (VAS). Between-group statistical differences in the VAS scores were determined using an independent t-test and those in canine retraction were determined using analysis of variance and post-hoc Tukey test. Results: No significant difference was found between the MOP-4 (1.22 ± 0.29 mm/month) and MOP-7 (1.29 ± 0.31 mm/month) groups in terms of the canine retraction rate. Moreover, both the groups demonstrated a significantly higher canine movement than the control group (0.88 ± 0.19 mm/month). MOPs did not significantly affect the mesialization of the posterior teeth (p > 0.05). Moreover, the pain scores in the MOP-4 and MOP-7 groups were similar and showed no statistically significant difference. Conclusions: Three MOPs with a depth of 4 mm can be performed as an effective method to increase the rate of tooth movement. However, three MOPs with depths of 4-7 mm does not additionally enhance tooth movement.

• 대한치과의사협회지
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• 제37권5호통권360호
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• pp.359-364
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• 1999

• 대한치과교정학회지
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• 제33권4호
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• pp.279-291
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• 2003

낮은 강도의 전류는 골세포의 활성화 대사를 증가시키는 것으로 알려져 왔다. 이 연구는 초소형 전기 장치에 의한 전기 자극이 교정적 치아 이동에 미치는 영향을 규명하기 위하여, 체중 3kg내외의 고양이 6마리를 대상으로 가철성 교정장치와 NiTi coil spring(75gm)을 사용하여 상악 견치를 이동시켰다. 실험군측 견치에는 교정력과 간헐적인 $20{\mu}A$의 전기 자극을 가하였고, 대조군측에는 같은 크기의 교정력만을 가한 후 4주 동안의 치아 이동량을 측정하여 비교하였으며, 치아를 중심으로 조직을 절취하여 탈회하고 조직 처리 후 광학 현미경으로 치주조직의 변화를 비교하여 다음과 같은 결론을 얻었다. 1. 28일간의 실험 기간 동안 실험측의 치아 이동량은 대조군에 비하여 현저히 증가하여, 4주후에 실험측의 치아는 대조군에 비하여 37% 증가된 이동량을 기록하였다. 2. 전기 자극을 받은 치아의 치근 견인측에서 대조군에 비하여 조직학적으로 증가된 골형성 양상이 관찰되었다. 3. 28일간의 전기 자극과 교정력으로 실험측 치아의 압박측에서 대조군에 비하여 증가된 골 흡수 양상이 관찰되었다. 4. 실험군 견치 치근 주위 조직에서는 전반적으로 더 많은 수의 조골 및 파골 세포들과 모세 혈관, 골양 조직들이 관찰됨으로써 증가된 조직 세포 활성을 반영하였다. 5. 1일 5시간 동안의 간헐적 전류 자극은 치아 이동량을 증가시키고 조직 개조를 활성화시키는 효과가 있었다. 이상의 결과는 외부에서 가한 낮은 강도의 간헐적 전기 자극으로 교정적 치아 이동량이 많아지고 치주 조직의 개조 활성이 증가됨을 보이므로 초소형 전기 장치에 의한 자극은 치아 이동과 주위 조직 개조를 촉진시킬 가능성이 있을 것으로 평가되었다.

• 대한치과교정학회지
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• 제29권2호
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• pp.157-163
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• 1999

본 연구의 목적은 교정적 치아 이동시 교정력과 Half sine-wane pulsed electromagnetic field (HSPEMF)를 함께 적용한 경우 교정력 만을 적용한 경우보다 치아 이동량이 증가한다는 가설을 확인하고, HSPEMF의 적용 시간을 다양하게 적용하여 치아 이동이 일어나는 적용 시간의 역치와 적용 시간과 치아 이동량과의 관계를 밝히는데 있다. Hartley guinea pig를 실험 대상으로 하여 상악 좌우측 중절치에 12 g의 이개력을 발휘하는 스프링을 장착하여 실험군에 각각 4 시간, 8 시간 및 12 시간 동안 HSPEMF를 적용한 후 치아 이동량을 측정하여 다음과 같은 결론을 얻었다. 1. 10 일간의 실험 기간 동안 하루 4 시간의 HSPEMF를 적용한 경우 실험군과 대조군에서 치아 이동량이 유의성있는 차이를 보이지 않았다. 2. 10일간의 실험 기간 동안 발생한 치아 이동량에 있어서, 하루 8 시간 및 12 시간의 HSPEMF를 적용한 경우 각각 실험 8 일 및 6 일 이후부터 실험군이 대조군보다 더 큰 유의성 있는 증가를 보였다. 3. 10일간의 실험 기간 동안 발생한 치아 이동량에 있어서, HSPEMF를 하루 12시간씩 적용한 경우가8시간씩 적용한 경우보다 실험 후 7 일과 8 일에서 더 큰 유의성 있는 증가를 보였다.

• 대한치과교정학회지
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• 제38권3호
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• pp.159-174
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• 2008

치아이동 시 피질골 천공이 치조골 재형성에 미치는 영향을 알아보기 위해서 생후 15주된 자성백서를 사용하여 피질골 천공 후 치아이동을 실시한 실험군(Tooth movement with cortical punching: TMC group, n = 16)과 교정적 치아이동만 실시한 대조군(Tooth movement only group: TM group, n = 16)의 치아주위조직을 면역조직화학염색을 통하여 관찰하였다. 실험군과 대조군의 실험동물에 20 gm의 힘으로 상악 전치부 사이를 이개시키는 치아이동을 시행하였으며 실험군에서는 상악 전치부 구개부위에 피질골 천공을 실시하였다. 치아이동 후 1, 4, 7, 14일째에 실험군과 대조군의 실험동물을 희생시켰다. 면역조직화학염색법으로 OPG, RANK, RANKI의 발현을 비교한 결과, OPG의 발현은 양 군 모두에서 미처치 대조군에 비하여 감소되었으나, 실험군에서의 발현이 대조군보다 컸으며, RANK, RANKL은 피질골 천공을 시행한 경우에 더 강한 발현을 보이는 것이 관찰되었다. 따라서 피질골 천공이 치주조직의 OPG, RANK, RANKL의 발현에 영향을 미치며 치조골의 재형성을 향상시키는 것을 알 수 있었다.

• 대한치과교정학회지
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• 제51권6호
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• pp.366-374
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• 2021

Objective: This study investigated the impact of a single piezocision in the maxillary alveolar process on the speed of tooth movement. The null hypothesis was that the speed of tooth movement will be equal with and without piezocision. Methods: All maxillary molars on one side were moved against the combined incisors in 10 ten-week-old male Wistar rats. Under general anesthesia, a force of 25 cN was applied on either side using a Sentalloy closed coil spring. After placing the orthodontic appliance, vertical corticision was performed using a piezotome under local anesthesia, 2 mm mesial from the mesial root of the first molar on a randomly selected side; the other side served as the control. At the beginning of the treatment, and 2 and 4 weeks later, skull micro-computed tomography was performed. After image reconstruction, the distance between the mesial root of the first molar and the incisive canal, and the length of the mesial root of the first maxillary molar were measured. Moreover, the root resorption score was determined as described by Lu et al. Results: Significantly higher speed of tooth movement was observed on the corticision side; thus, the null hypothesis was rejected. The loss of root length and root resorption score were significantly more pronounced after piezocision than before. A strong correlation was observed between the speed of tooth movement and root resorption on the surgical side, but the control side only showed a weak correlation. Conclusions: Piezocision accelerates orthodontic tooth movement and causes increased root resorption.

• 대한치과교정학회지
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• 제19권2호
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• pp.25-34
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• 1989

This experiment was performed to study the effect of prostaglandin $E_2$ on tooth movement and root resorption in orthodontically treated cats. Twenty five cats were divided into five groups and closed coil springs delivered 80gm were stretched between upper canine and 3rd premolar. $10{\mu}g$ of $PGE_2$ was injected locally in the submucosal area of the upper right canine, while the left side served as a control and was injected saline 0.1ml. The distance between canine tip and central cusp tip of the 3rd premolar was measured. Scanning electron photomicrographs were made of the coronal half of the distal root surface of canines and cemental craterings were observed and quantified using point-counting volumetry. Data were analyzed by 2-way ANOVA and paired t-test. The results were as follows: 1. The rate of tooth movement of the $PGE_2$ side was increased, particularly at 1 day, compared with the control side. 2. The rate of tooth movement was minimum from 7 days to 10 days. 3. The resorption of root surface of the $PGE_2$ side was decreased from 4 days to 10 days, compared with the control side.

• 대한치과교정학회지
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• 제54권1호
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• pp.3-15
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• 2024

The prevalence of intrabony defects in patients with advanced periodontitis stages III and IV is high. These patients usually need both periodontal treatment and orthodontic therapy, including tooth movement through bone defects, to improve masticatory function, aesthetics, and overall quality of life. Clinical practice guidelines recommend periodontal regenerative surgical interventions to resolve these defects and propose initiating orthodontic tooth movement (OTM) once periodontal therapy goals have been met. Surgical interventions using various regenerative technologies like barrier membranes and enamel matrix proteins, combined or not with bone replacement grafts, have proven effective in regenerating lost periodontal tissues. However, the combination of periodontal and orthodontic treatments requires consideration of how periodontal regenerative therapies influence OTM. Studies suggest that regenerated bone may differ in density, composition, vascularity, and cellular activity, potentially affecting the speed and efficiency of OTM, and potential root resorption of moved teeth. Understanding the sequence and timing of implementing OTM after regenerative periodontal interventions is crucial due to their interlinked processes of bone resorption and formation. This narrative review aims to uncover scientific evidence regarding these combined treatments, examining the impacts of different regenerative technologies on OTM and delineating their advantages, limitations, and best practices.

• Restorative Dentistry and Endodontics
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• 제37권2호
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• pp.114-118
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• 2012

인접면의 우식증으로 인해 인접면의 공간 소실과 후방치아의 근심 경사가 발생한 본 증례에서 치아의 보철 수복 전 교정용 링의 삽입과 임시 전장관의 수정을 통해 치간 공간의 획득과 치축의 개선을 시행할 수 있었다.