MicroCT를 이용한 상악 전치의 법랑질 두께에 관한 연구
A study on enamel thickness of maxillary incisors using X-ray micro computed tomography
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
연구 목적: 이번 연구의 목적은 법랑질 두께를 측정하는데 있어 microCT의 정확성을 평가하고, 한국인의 상악전치 법랑질 두께를 알아봄으로써 임상에 도움을 주고자 한다. 연구 재료 및 방법: 발거된 상악 중절치 5개를 레진 포매하여 치아 장축을 따라 정중부에서 협설로 절단하고 연마한 후에 microCT를 촬영하여 scanning electron microscope 상 (× 20)에서와 microCT 상에서 거의 동일한 절단면을 구현하였고, 각각 백악법랑경계 상방 1, 3, 5 mm 부위의 협측 법랑질 두께를 측정하여 microCT의 정확성을 평가하였다. 또한 상악 중절치 26개와 측절치 11개를 이용하여 각 치아의 순측 정중부와 정중부에서 근원심으로 각각 2 mm 떨어진 선상에서 백악법랑경계의 상방 1, 3, 5 mm 지점의 법랑질 두께를 측정하였다. 정중부의 세 지점에서는 정중부를 지나는 시상면에서 법랑질 표면에 접선을 그어 이 접선에 수직으로 법랑상아경계까지 수선을 내려 법랑질 두께를 측정하였고, 근원심 2 mm를 지나는 선상에 있는 6개 지점에서는 각 지점을 지나는 수평면에서 법랑질 표면에 접선을 그어 이 접선에 수직으로 법랑상아경계까지 수선을 내려 법랑질 두께를 측정하였다. 결과: 동일한 절단면에서 주사전자현미경과 microCT를 이용하여 백악법랑경계 상방 1, 3, 5 mm 지점의 순면 법랑질 두께를 측정한 값은 평균 3.81% 차이가 났으나, independent t-test 결과 두 가지 방법에 의한 측정값은 통계적으로 유의한 차이가 없었다. 상악 중절치의 정중부에서 백악법랑경계 1, 3, 5 mm 상방의 순면 법랑질 두께는 각각 0.32 ± 0.01, 0.50 ± 0.02, 0.70 ± 0.02 mm로 나타났다. 상악 측절치의 정중부에서 백악법랑경계 1, 3, 5 mm 상방의 순면 법랑질 두께는 각각 0.30 ± 0.01, 0.55 ± 0.03, 0.80 ± 0.02 mm로 나타났다. 결론: 법랑질 두께를 측정하는데 있어 microCT는 유용한 측정방법의 하나이며, 이번 연구의 결과로 볼 때 한국인의 상악전치부 도재 라미네이트 수복시 법랑질의 삭제량에 주의를 기울일 필요가 있는 것으로 사료된다.
Abstract
Purpose: The objectives of the current study are to assess the accuracy of X-Ray Micro Computed Tomography (microCT) in measuring enamel thickness and to evaluate enamel thickness in maxillary incisors of Koreans. Materials and methods: Five maxillary incisors were embedded in resin block. These teeth were longitudinally sectioned labiolingually through the medial axis. After polishing, the teeth were scanned using a microCT (X-EYE SYSTEM; DRGEM, Seoul, Korea). On a scanning electron microscope (S-4300; Hitachi, Tokyo, Japan) (×20) and a microCT, nearly identical planes were reconstructed. In each tooth, the thickness of labial enamel was measured 1, 3 and 5 mm above the cementoenamel junction (CEJ). Thus, the accuracy of the microCT was evaluated. In addition, using 26 maxillary central incisors and 11 maxillary lateral incisors, in the medial axis and 2 mm remote areas mesially and distally from the medial axis, the thickness of labial enamel was measured 1, 3 and 5 mm above the CEJ along the long axis of the teeth. Results: Measurements from nearly identical planes in physical and microCT sections differed by 3.81%. An independent t-test was performed and this showed that there were no significant differences in the measurements between the two methods. Mean values of labial enamel thickness in maxillary central incisors 1, 3 and 5 mm above the CEJ were 0.32 ± 0.01, 0.50 ± 0.0.2 and 0.70 ± 0.02 mm, respectively. Mean values of labial enamel thickness in maxillary lateral incisors 1, 3 and 5 mm above the CEJ were 0.30 ± 0.01, 0.55 ± 0.03 and 0.80 ± 0.02 mm, respectively. Conclusion: In measuring enamel thickness, microCT is one of useful way of measurement. So according to the results of this research, when restoring a porcelain laminate veneer on maxillary incisors in Koreans, careful consideration is needed in the amount of enamel reduction.
참고문헌 (38)
- Freidman MJ, "Augmenting restorative dentistry with porcelain veneers", J Am Dent Assoc, 122, pp.29~34 (1991)
- Shillingburg HT, "Fundamentals of Fixed Prosthodontics. 3rd Ed", pp.441~ (1997), Quintessence
- Christensen GJ, "Veneering of teeth. State of the art", Dent Clin North Am, 29, pp.373~391 (1985)
- Clyde JS, "Porcelain veneers: a preliminary review", Br Dent J, 164, pp.9~14 (1988)
- Tjan AH, "Microleakage patterns of porcelain and castable ceramic laminate veneers", J Prosthet Dent, 61, pp.276~282 (1989)
- Ferrari M, "Measurement of enamel thickness in relation to reduction for etched laminate veneers", Int J Periodontics Restorative Dent, 12, pp.407~413 (1992)
- Edelhoff D, "Tooth structure removal associated with various preparation designs for anterior teeth", J Prosthet Dent, 87, pp.503~509 (2002)
- Christensen GJ, "Has tooth structure been replaced?", J Am Dent Assoc, 133, pp.103~105 (2002)
- Walls AW, "Crowns and other extracoronal restorations: porcelain laminate veneers", Br Dent J, 193, pp.73~76 (2002)
- Sheets CG, "Advantages and limitations in the use of porcelain veneer restorations", J Prosthet Dent, 64, pp.406~411 (1990)
- Hui KK, "A comparative assessment of the strengths of porcelain veneers for incisor teeth dependent on their design characteristics", Br Dent J, 171, pp.51~55 (1991)
- Kedici PS, "Effect of glass ionomer liners on bonding strength of laminate veneers", J Prosthet Dent, 68, pp.29~32 (1992)
- Peumans M, "Porcelain veneers: a review of the literature", J Dent, 28, pp.163~177 (2000)
- Sorensen JA, "Relative gap formation of resin-cemented ceramic inlays and dentin bonding agents", J Prosthet Dent, 76, pp.374~378 (1996)
- Schneider PM, "The effect of enamel surface reduction in vitro on the bonding of composite resin to permanent human enamel", J Dent Res, 60, pp.895~900 (1981)
- Lacy AM, "In vitro microleakage at the gingival margin of porcelain and resin veneers", J Prosthet Dent, 67, pp.7~10 (1992)
- Zaimoglu A, "Microleakage in porcelain laminate veneers", J Dent, 19, pp.369~372 (1991)
- Zaimŏglu A, "Influence of porcelain material and composite luting resin on microleakage of porcelain laminate veneers", J Oral Rehabil, 19, pp.319~327 (1992)
- Sim C, "The effect of dentin bonding agents on the microleakage of porcelain veneers", Dent Mater, 10, pp.278~281 (1994)
- Atsu SS, "Age-related changes in tooth enamel as measured by electron microscopy: implications for porcelain laminate veneers", J Prosthet Dent, 94, pp.336~341 (2005)
- Grine FE, "An evaluation of dental radiograph accuracy in the measurement of enamel thickness", Arch Oral Biol, 46, pp.1117~1125 (2001)
- Harris EF, "A radiographic assessment of enamel thickness in human maxillary incisors", Arch Oral Biol, 43, pp.825~831 (1998)
- Stroud JL, "Enamel thickness of the posterior dentition: its implications for nonextraction treatment", Angle Orthod, 68, pp.141~146 (1998)
- Stroud JL, "Sexual dimorphism in mesiodistal dentin and enamel thickness", Dentomaxillofac Radiol, 23, pp.169~171 (1994)
- Scotti R, "Clinical applicability of the radiographic method for determining the thickness of calcified crown tissues", J Prosthet Dent, 65, pp.65~67 (1991)
- Barber FE, "Urasonic pulse-echo measurements in teeth", Arch Oral Biol, 14, pp.745~760 (1969)
- Huysmans MC, "Ultrasonic measurement of enamel thickness: a tool for monitoring dental erosion?", J Dent, 28, pp.187~191 (2000)
- Schwartz GT, "Enamel thickness and the topography of the enamel-dentine junction in South African Plio-Pleistocene hominids with special reference to the Carabelli trait", J Hum Evol, 35, pp.523~542 (1998)
- Beynon AD, "Variations in enamel thickness and structure in East African hominids", Am J Phys Anthropol, 70, pp.177~193 (1986)
- Olejniczak AJ, "Assessment of the accuracy of dental enamel thickness measurements using microfocal X-ray computed tomography", Anat Rec A Discov Mol Cell Evol Biol, 288, pp.263~275 (2006)
- Piemjai M, "Compressive fracture resistance of porcelain laminates bonded to enamel or dentin with four adhesive systems", J Prosthodont, 16, pp.457~464 (2007)
- Nakamura T, "Adhesive strength between teeth and resin cements for porcelain laminate veneer", J Osaka Univ Dent Sch, 32, pp.21~26 (1992)
- Dumfahrt H, "Porcelain laminate veneers. A retrospective evaluation after 1 to 10 years of service: Part II-Clinical results", Int J Prosthodont, 13, pp.9~18 (2000)
- Horn HR, "Porcelain laminate veneers bonded to etched enamel", Dent Clin North Am, 27, pp.671~684 (1983)
- Calamia JR, "Etched porcelain veneers: the current state of the art", Quintessence Int, 16, pp.5~12 (1985)
- Weinberg LA, "Tooth preparation for porcelain laminates", N Y State Dent J, 55, pp.25~28 (1989)
- Chpindel P, "Tooth preparation and fabrication of porcelain veneers using a double-layer technique", Pract Periodontics Aesthet Dent, 6, pp.19~28 (1994)
- Garber D, "Porcelain laminate veneers: ten years later. Part I: Tooth preparation", J Esthet Dent, 5, pp.56~62 (1993)