• 대한치과교정학회지
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• 제34권3호
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• pp.241-251
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• 2004

교정치료에 대한 인지도 변화 및 보호자의 관심증가로 조기에 내원하는 환자가 많으며 그 중 일부가 전치부 치근첨이 완성되기 전인 10세 이전에 고정식 교정장치가 필요하게 된다 따라서 본 연구에서는 미완성 치근의 치료 전후 치근의 길이 변화를 측정하고 형태변화를 관찰하여 완성된 치근의 교정력에 의한 변화양상과 비교하고, 환자의 성별, 기간, 이동양상 등과의 연관성을 조사하였다. 상악의 전치부 치근첨이 완성되지 않은 상태에서 고정식 교정치료를 시작한 8~10세 환자 28명을 실험군으로 하고, 치근첨이 완성된 상태에서 고정식 교정치료를 시작한 11~15세 환자 31명을 대조군으로 삼았다. 상악 4전치의 치료 전후 치근단 방사선사진상에서 치관, 치근길이를 측정해서, 치근길이의 변화량, 치관/치근 비의 변화량을 계산했고 분류체 계에 따라 치근형태에 점수를 부여했다. 결과는 다음과 같다. 1. 대부분의 미완성 치근은 교정치료 후에도 치근 길이가 증가하였으며 정상적인 치근첨 형태를 보였다. 2. 치료기간이 길어지거나 개방교합의 경우, 미완성 치근이라도 치근길이가 증가하지 않거나 더 짧아진 경우도 있었으며 정상적인 길이가 되더라도 치근첨의 완성 형태가 뭉툭한 흡수 형태를 보였다. 3. 완성치근에서는 교정치료에 의하여 대부분의 치근이 경미한 치근흡수를 보였으며, 흡수된 치근첨의 형태는 미완성 치근의 완성형태보다 더 뭉툭하였다(p<0.05). 4, 미완성 치근에서는 치료기간과, 완성치근에서는 치아의 이동거리(U1 to facial plane의 변화량)와 유의한 상관관계를 보였다(P<0.05). 5. 미완성 치근, 완성치근 모두 성별, 부정교합 분류, 수직피개의 변화량, 두개저에 대한 치아의 위치 변화(U1 to SN의 변화량)등과는 유의한 상관관계를 보이지 않았다.

• 대한치과교정학회지
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• 제41권5호
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• pp.361-370
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• 2011

Objective: Speedy surgical orthodontics (SSO), an innovative orthodontic treatment, involves the application of orthopedic forces against temporary skeletal anchorage devices following perisegmental corticotomy to induce movement of specific dental segments. Herein, we report the biological effects of SSO on the teeth and periodontal structures. Methods: Five beagle dogs were divided into 2 groups and their 6 maxillary incisors were retracted $en$ $masse$ by applying 500 g orthopedic force against a single palatal mini-plate. Retraction was performed without and with perisegmental corticotomy in groups I and II, respectively. All animals were killed on the 70th day, and their periodontal structures were processed for histologic analyses and scanning electronic microscopy (SEM). The linear distance between the third maxillary incisor and canine was used as a benchmark to quantify the retraction amount. Results: Retraction was markedly faster and retraction amount greater in group II than in Group I. Surprisingly, Group II did not show any root resorption despite extensive retraction, while Group I showed prominent root surface irregularities. Similarly, SEM showed multiple resorption lacunae in Group I, but not in Group II. Conclusions: SSO is an effective and favorable orthodontic approach for major en masse retraction of the maxillary anterior teeth.

• 대한치과교정학회지
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• 제26권4호
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• pp.441-447
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• 1996

본 연구는 상악 전돌증을 보이는 환자에게서 상악 제 1 소구치를 발치한 후 견인시 bracket 종류에 따른 치근흡수 차이, 이동양상에 따른 치근 흡수 차이, 각 치아간에 따른 전치부의 치근 흡수 정도를 연구하기 위해 단국 대학교 부속 치과 병원 교정과에 내원한 남녀 환자 32명을 대상으로 연구하여 다음과 같은 결과를 얻었다. 1. 상악 전치 후방 견인시 치근 흡수를 보이지 않는 것은 31.77%, 약간의 흡수는 33.33%, 치근의 1/4이하 흡수는 23.96%, 1/4이상은 10.94%를 보였다. 2. Apical tipping, lingually bodily movement, ant-post apical displacement 의 세가지 이동 양상은, 치근 흡수와의 상관 관계에 유의한 차이를 보이지 않았다. 3. Standard br.을 사용한 환자는 많은 치축 변화를 보이고 치근첨의 이동은 적었으나, straight br.을 사용한 환자는 적은 치축 변화를 보이고 치근첨의 이동량은 많았다. 4. Standard br.과 straight br.의 치근흡수에서 standard br.을 사용한 환자가 더 많은 치근 흡수를 보였다. 5. Standard br.을 사용시 치근 흡수정도는 2>1>3=0순을 보이고, straight br.을 사용시에는 0>1>2>3으로 나타났다.

• 대한치과의사협회지
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• 제52권1호
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• pp.8-16
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• 2014

The introduction of cone-beam computed tomography(CBCT) and computer software in orthodontics has allowed orthodontists to provide more accurate diagnosis and treatment. The most common use of CBCT imaging allows orthodontists to visualize the precise position of supernumerary or impacted teeth, especially impacted canines. In doing so, the exact angulation of impaction and proximity of adjacent roots can be evaluated by orthodontists, allowing them to choose vector forces for tooth movement while minimizing root resorption. Even though 2-dimensional panoramic images can be used to view the position of the impacted canines, they have limitations because it is not possible to evaluate the impacted tooth position 3-dimensionally. An accurate knowledge of root position improves the determination of success in orthodontic treatment. Nowadays, considering the fast pace of technological development, a combination of intraoral scanning, digital setups, custommade brackets and wires, and indirect bonding may soon become the orthodontic standard. In this paper, this will be discussed along with the digital models.

• Journal of Periodontal and Implant Science
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• 제38권4호
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• pp.709-716
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• 2008

Purpose: Autogenous transplantation of teeth can be defined as transplantation of teeth from one site to another in the same individual, involving transfer of impacted or erupted teeth into extraction sites or surgically prepared sockets". Successful autogenous transplantation of teeth depends upon a complex variety of factors. Such factors include damage to the periodontal ligament of the donor tooth, residual bone height of the recipient site, extra-oral time of tooth during surgery. Schwartz and Andreasen previously reported that autogenous transplantation of teeth with incomplete root formation demonstrated higher success rate than that of teeth with complete root formation. Gault and Mejare yielded similar rate of successful autogenous transplantation both in teeth with complete root formation and in teeth with incomplete root formation when appropriate cases were selected. This case report was aimed at the clinical and radiographic view in autogenous transplantation of teeth with complete root formation. Materials and Methods: Patients who presented to the department of periodontics, Chonnam National University Hospital underwent autogenous transplantation of teeth. One patient had vertical root fracture in a upper right second molar and upper left third molar was transplanted. And another patient who needed orthodontic treatment had residual root due to caries on upper right first premolar. Upper right premolar was extracted and lower right second premolar was transplanted. Six months later, orthodontic force was applied. Results: 7 months or 11/2 year later, each patient had clinically shallow pocket depth and normal tooth mobility. Root resorption and bone loss were not observed in radiograph and function was maintained successfully. Conclusion: Autogenous transplantation is considered as a predictive procedure when it is performed for the appropriate indication and when maintenance is achieved through regular radiographic taking and follow-up.

• 대한치과교정학회지
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• 제21권3호
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• pp.635-656
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• 1991

It was the aim of this investigation to evaluate some histologic aspect of rat pulp tissue after it had been compromised by an experimental orthodontic force. Experimental animals of thirty five Spraque-Dawley rats were employed. The first upper molars had been successively mesial moved (initial load 100 gr.) with a closed coil spring during 21 days. The experimental periods were set on immediate, 1 day, 1 week, 2 weeks, 3 weeks, 4 weeks following retention time. On each experimental period, the rats were killed and prepared for the light microscopy. After prepared with H/E stain and Gomori's one-step trichrome stain, the specimens were analyzed with evaluation criteria which were adopted in this study. The result may be summarized as follows; 1. The main pulp changes due to experimental orthodontic force included vacuolization of odontoblastic layer, circulation disturbance, root resorption, reduced pulp collagenous fiber density and mean cell count of pulp fibroblast in the immediate group. 2. The pulp tissue changes were revealed reversible because the relieved pulp tissues from experimental orthodontic force were recovered rapidly in each evaluation criteria during retention periods. 3. Compared with normal control group, pulp collagenous fiber density were decreased in immediated group (p < 0.01), but increased in each retention groups. These seem to suggest that the pulp tissues were aged after experimental orthodontic force conditions. 4. Compared with normal control group, mean cell counts of pulp fibroblasts were decreased in immediate group (p < 0.05), but increased continuous in each retention groups. These seem to indicate that the pulp tissues were highly regenerative after experimental orthodontic force conditions. 5. Compared with normal control group, root resorptions occurred in all immediate specimens (p < 0.01) and they were healed in each retention periods, but often observed in 4 weeks retention group. These seem to indicate that root resorptions were recovered slowly after experimental orthodontic force conditions.

• 대한치과교정학회지
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• 제29권6호
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• pp.689-698
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• 1999

교정치료의 목표는 치아와 악골의 기능성과 심미성을 높이며 안정성을 도모하는데 있지만 치료 과정 중에 치근흡수와 치조골 흡수와 같은 여러 가지 후유증이 발생할 수 있다. 이러한 치근첨의 흡수는 예측이 불가능하고, 상아질 부위까지 파급될 수 있으며, 발생 후 비가역적이다. 여러 가지 구강악습관중 손톱 깨물기 버릇의 치근과 치주조직에 대한 영향을 평가하여 교정 치료시 적절한 생역학을 고려하고, 교정치료동안 잠재적으로 치근흡수와 치조골 상실의 가능성에 대처하며, 사전에 법적인 문제에 신중을 기할 수 있을 것이다. 연구대상은 10~15세의 남녀 환자를 문진을 통해서 파악된 손톱깨물기 버릇을 가진 63명을 실험군으로 하였고, 같은 연령대의 손톱 깨물기 버릇이 없는 군을 대조군으로 설정하였다. 이들은 실험군에서 각각 남자30명, 여자 33명이었고, 대조군에서는 남자 31명, 여자 32명이었으며 다음과 같은 연구 결과를 얻었다. 1. 실험군과 대조군은 각각 63명을 대상으로 하였으며 남.여 비율은 1:1이었고, 치근흡수에 있어서 통계학적으로 남.여간의 유의성 차이는 보이지 않았다. 2. 치관의 길이를 비교할 때 실험군과 대조군에서 유의성 있는 차이를 보이지 않았으나, 치근의 길이는 실험군에서 상 하악 양측 중절치와 하악 우측 측절치에서 상대적으로 더 짧은 값을 보였다(p<0.001). 3. 실험군의 치근단 방사선 사진상에서 치관 대 치근 평균 길이의 비에서 상.하악 양측 중절치와 하악 양측 측절치에서 유의성 있는 큰 값을 보였다 (p< 0.01). 4. Cemento-Enamel Junction에서 alveolar crest bone까지의 거리 측정에 의한 치조골 상실량의 비교 평가한 경우 실험군에서 상 하악 좌 우측 중절치의 근심면과 상악 우측 중절치의 원심면에서 대조군보다 유의성 있게 crestal bone의 상실을 보였다 (p<0.05).

• 대한치과교정학회지
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• 제54권1호
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• pp.16-25
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• 2024

Objective: To compare the effectiveness of laser-engineered copper-nickel titanium (SmartArch) and superelastic nickel-titanium (SENT) archwires in aligning teeth and inducing root resorption and pain experienced by patients. Methods: Two-arm parallel groups with a 1:1 allocation ratio were used. The participants were patients aged 11.5 years and older with 5-9 mm of mandibular anterior crowding who were indicated for non-extraction treatment. The primary outcome was alignment effectiveness, assessed using Little's irregularity index (LII) over 16 weeks with a single wire (0.016-inch) in the SmartArch group and 2 wires (0.014- and 0.018-inch) in the SENT group (8 weeks each). Secondary outcomes included root resorption evaluated by pre- and post-intervention periapical radiographs and pain levels recorded by the participants during the first week. Results: A total of 40 participants were randomly allocated into 2 groups; 33 completed the study and were analyzed (16 in the SmartArch group and 17 in the SENT group, aged 16.97 ± 4.05 years). The total LII decrease for the SmartArch and SENT groups was 5.63 mm and 5.29 mm, respectively, which was neither statistically nor clinically significant. Root resorption was not significantly different between the groups. The difference in pain levels was not statistically significant for the first 5 days following wire placement; however, there was a significant difference favoring the SENT group in the final 2 days. Conclusions: SmartArch and SENT archwires were similarly effective during the alignment phase of orthodontic treatment. Root resorption should be observed throughout the treatment with either wire. SmartArch wires demonstrated higher pain perception than SENT wires.

• 대한소아치과학회지
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• 제38권4호
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• pp.435-440
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• 2011

상악 견치의 매복은 소아치과 의사가 흔히 접할 수 있는 맹출장애이며, 이를 방치하였을 경우 인접치의 치근 흡수, 낭종 형성 등의 임상적인 문제점을 유발할 수 있다. 이에 대한 치료는 간단한 유치 발치에서부터 매복치아의 교정적 견인, 외과적 자가이식 등 다양한 방법을 고려할 수 있다. 이 중 자가 이식은 매복치아가 교정적 견인술을 시행하기 어려운 위치에 존재하거나 재위치 시키는데 실패했을 경우에 매복치아의 발거에 앞서 고려할 수 있으며, 그 예후는 치근의 완성도, 환자연령, 외과적 술식, 근관치료 시기, 치아고정 기간 등에 의해 결정된다. 본 두 증례들은 혼합치열기 말기에 상악 견치가 매복된 환자에서 그 매복 위치가 자발적인 맹출 유도나 교정적 견인 및 배열이 어렵다고 판단된 경우이며, 자가 이식 후 근관치료와 교정 치료를 시행하고 현재까지 성공적으로 유지되고 있어 보고하는 바이다.

• 대한치과의사협회지
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• 제15권6호
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• pp.437-443
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• 1977

Author came to the following conclusion and made the following report as a result of corticotomy that treated in department of orthodontics and oral surgery, Tokyo Dental College. 1. In the respect of oral surgery, corticotomy is able to operate under local anesthesia. This operation is very simple and there is little clinical discomfort after operation. 2. In the respect of orthodontics, tooth movement is 2-3 times rapid than common orthodontic treatment in adult and clinical problem such as pain, root resorption are slight. Especially, tooth movement by differential force, rapid expansion in adult and unilateral expansion which was difficult, came to possible. 3. Corticotomy shorten the treatment time in preoperative orthodontic treatment of developmental abnormality of jaw, application to cleft lip & palate, orthodontic treatment before prosthetics. It's application is so wide that bring on much profits.