구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)

  • 제32권1호
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  • Pages.47-59
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  • 2016
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  • 2384-4353(pISSN)
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  • 2384-4272(eISSN)
대한턱관절교합학회 (Korean Academy of Stomatognathic Function and Occlusion)
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하악 제1대구치 상실 시 인접 및 대합 치아들의 이동양상에 따른 교합력 변화: 스트레인게이지를 이용한 비교 연구

Changes in occlusal force depending on the movement of the adjacent and opposing teeth after loss of lower first molar: comparative study by using a strain gauge

  • 송명자 (이화여자대학교 임상치의학대학원 교정학교실) ;
  • 박지만 (관악서울대학교치과병원 치과보철과) ;
  • 전윤식 (이화여자대학교 임상치의학대학원 교정학교실)
  • Song, Myoung-Ja (Department of Orthodontics, Graduate School of Clinical Dentistry, Ewha Womans University) ;
  • Park, Ji-Man (Department of Prosthodontics and Dental Research Institute, Seoul National University Gwanak Dental Hospital) ;
  • Chun, Youn-Sic (Department of Orthodontics, Graduate School of Clinical Dentistry, Ewha Womans University)
  • 투고 : 2016.02.17
  • 심사 : 2016.02.29
  • 발행 : 2016.03.31
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초록

목적: 하악 제1대구치 상실 시 인접 및 대합 치아들의 경사 및 정출 정도에 따른 교합력의 변화를 스트레인게이지를 이용하여 측정 및 비교하는 것이다. 연구 재료 및 방법: 인접 및 대합 치아들의 경사 및 정출이 심화되는 정도를 점진적으로 네 개의 다이에 표현 후, CAD/CAM 제작 맞춤형 다이 시스템을 통하여 주모형에 부착 및 교체 가능하도록 하였다. 치아에 스트레인게이지를 부착 후, 만능물성시험기로 저작력을 가하면서 상하악 치아의 교합력을 측정하였다. 통계처리는 독립표본 t검증과 일원배치 분산분석을 시행하였다(${\alpha}=.05$). 결과: 대구치 상실 후 치아이동에 따른 교합력의 양상은, 네 단계의 모형에 대한 교합력의 차이가 통계적으로 유의하였고, 감소 추세였다. 음식물 저작 시 인접 치아들의 이동에 따라 상악 제1, 2소구치, 하악 제2대구치에서 점차 교합력이 감소되었다. 음식물의 경도가 감소함에 따라 치아의 교합력이 점차적으로 감소하였다. 육포 저작 시 하악 제2대구치의 교합력이 가장 높게 측정되었다(P < 0.05). 결론: 하악 제1대구치가 상실되고 치아 이동이 일어나기 전에는 저작 시 치아가 상실되지 않았을 때에 비해 인접 및 대합 치아들의 교합력이 높은 반면, 치아 이동이 진행됨에 따라 교합력은 정량적으로 감소하였다.

Purpose: The aim of this study was to investigate the changes in occlusal force after loss of the lower first molar depending on the inclination and extrusion of the adjacent and opposing teeth by using a strain gauge. Materials and Methods: Anatomic teeth were used to reconstruct the normal dental arch with loss of the lower right first molar. A uniformly thick layer of silicone was applied to the root to mimic the periodontal ligament. Four stages of dies with varying degrees of inclination and extrusion of the adjacent and opposing teeth were constructed and attached to master model interchangeably by using a CAD/CAM fabricated customized die system. The strain gauges were attached to teeth and a universal testing machine was used to determine the changes in occlusal force. An independent t-test and one-way ANOVA were performed (${\alpha}=.05$). Results: While simulating chewing food, the upper first, second premolar and lower second molar showed greater occlusal force than before extraction. When the change of adjacent teeth's occlusal force with their progressive movement after molar loss was evaluated, the difference among four die models was significant and was in the decreasing aspect (P < 0.05). Conclusion: When the lower first molar was lost and the adjacent teeth did not move yet, the occlusal force in adjacent teeth was higher than that when the lower first molar still existed. In addition, the occlusal force in the upper premolars and lower second molar decreased significantly with the progressive movement of adjacent teeth.

키워드

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