• Title/Summary/Keyword: hard tissue

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A CEPHALOMETRIC STUDY OF SOFT TISSUE PROFILE CHANGES ASSOCIATED WITH ORTHODONTIC TREATMENT (Cephalogram 분절(分折)에 의(依)한 부정교합자(不正咬合者) 치료전후(治療前後)의 연조직(軟組織) 측모(側貌) 변화(變化)에 관(關)한 연구(硏究))

  • Park, Young Guk;Lee, Ki Soo
    • The korean journal of orthodontics
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    • v.14 no.1
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    • pp.103-113
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    • 1984

  • This work was undertaken to evaluate the integumental response in lower face to hard tissue changes, and to grope the prediction equation for expected integumental profile changes. Cephalometric headplates of 25 persons consisted of 8 Angle's class 1 maxillary protrusive and 17 Angle's class II division 1 patients whose mean age was 15.2 years were traced, diagramatized, and statistically analyzed. The results were as follows; 1. Upper incisor and lips were retracted and convexity of integumental profile decreased concurrently with decrease of hard tissue procumbency, however soft tissue point A', B', and Pog' did not undergo significant changes after orthodontic treatment. 2. Remarkable increment of upper lip thickness and upper lip height was shown and this was related to upper incisor retraction. The ratio between the amount of upper incisor retraction and the increment o f upper lip thickness was approximately 1.16:1. 3. Moderate correlation of upper lip retraction to upper incisor retraction, and of lower lip retraction to lower incisor movement were arranged, and yet comparatively wide variability from subject to subject was shown. 4. It was possible to predict statistically for horizontal alteration of lip position and change of upper lip angulation ground in orthodontic treatment.

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SOFT TISSUE CHANGES AFTER DOUBLE JAW ROTATION SURGERY IN SKELETAL CLASS III MALOCCLUSION (골격성 III 급 부정 교합자에서 양악 회전 수술 후 연조직 변화에 대한 연구)

  • Jeong, Mi-Hyang;Choi, Jeong-Ho;Kim, Byuong-Ho;Kim, Seong-Gon;Nahm, Dong-Seok
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • v.32 no.6
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    • pp.559-565
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    • 2006

  • The aim of this study was to evaluate the amount and interrelationship of the soft and hard tissue changes after simultaneous maxillary clockwise rotation and mandibular setback surgery in skeletal class III malocclusion. The sample comprised of 16 adult patients who had anteroposterior skeletal discrepancy. These patients had received presurgical orthodontic treatment and surgical treatment which consisted of Le fort I Osteotomy and bilateral saggital split ramus osteotomy. The presurgical (T1) and postsurgical (T2) lateral cephalograms were evaluated. The computerized statistical analysis was carried out with SPSS/PC program. The results demonstrated a decrease in the vertical dimension in the soft and hard tissue. The nasolabial angle was increased and the mentolabial angle was decreased. The results showed also many statistically significant correlations(p<0.05). The lower lip closely followed the skeletal movement of the B- point in the horizontal plane. The double jaw rotation surgery can afford a good solution to solve the problems of class III malocclusion cases.

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