The dimension analysis of prepared natural teeth for developing customized zirconia block

Min-Hyuk Kim; Sung-Hun Kim; In-Sung Yeo; Hyung-In Yoon; Jae-Hyun Lee; Jung-Suk Han

doi:10.4047/jkap.2017.55.4.381

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Kim, Kim, Yeo, Yoon, Lee, and Han: The dimension analysis of prepared natural teeth for developing customized zirconia block

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2017;55(4):381-388.

Published online: NaN October 2017

DOI: https://doi.org/10.4047/jkap.2017.55.4.381

The dimension analysis of prepared natural teeth for developing customized zirconia block

Min-Hyuk Kim, Sung-Hun Kim, In-Sung Yeo, Hyung-In Yoon, Jae-Hyun Lee, Jung-Suk Han^∗

Department of Prosthodontics, Seoul National University School of Dentistry, Seoul, Republic of Korea

∗Corresponding Author: Jung-Suk Han Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehakno, Jongno-gu, Seoul 03080, Republic of Korea +82 (0)2072 2661: e-mail, proshan@snu.ac.kr

Received 7 June 201716 August 2017 Accepted 21 August 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

Unpredictable shrinkage of zirconia during sintering process causes discrepancy. Therefore, there have been attempts to reduce discrepancy by milling zirconia after sintering. However, due to the hardness of sintered zirconia, milling takes longer time, causes damage to the machine and causes chip formation. With customized zirconia block using the mean dimension of prepared natural dentition, it is expected to overcome these shortcomings.

Materials and methods

The mean dimension of prepared natural dentition was analyzed as STL file after scanning of prepared teeth treated at SNUDH. The transverse, frontal and sagittal planes were set using Mimics and Photoshop. 3D volume was projected on each plane, and the outer line was measured through external tangent line, and the inner line was measured through inflection point of tangent line.

Results

The mean height of prepared incisal (N = 57) is 6.60 ± 1.05 mm, mesiodistal length is 2.98 ± 0.73 mm, buccolingual length is 2.04 ± 0.73 mm. The mean height of prepared premolar (N = 15) is 5.37 ± 1.49 mm, mesiodistal length is 4.10 ± 1.78 mm, buccolingual length is 5.86 ± 1.55 mm. And the mean height of prepared molar (N = 13) is 5.11 ± 1.29 mm, mesiodistal length is 6.80 ± 1.18 mm, buccolingual length is 7.34 ± 1.40 mm.

Conclusion

Using the mean dimension of prepared natural dentition, it is expected to be able to fabricate customized zirconia block. (J Korean Acad Prosthodont 2017;55:381-8)

Keywords: Zirconia, Sintering, Customized zirconia block

REFERENCES

1.Giordano RA. Dental ceramic restorative systems. Compend Contin Educ Dent. 1996. 17:779–82. 784-6 passim; quiz 794.

2.Campbell SD. A comparative strength study of metal ceramic and all-ceramic esthetic materials: modulus of rupture. J Prosthet Dent. 1989. 62:476–9.

3.Seghi RR., Sorensen JA. Relative flexural strength of six new ceramic materials. Int J Prosthodont. 1995. 8:239–46.

4.Kelly JR. Dental ceramics: current thinking and trends. Dent Clin North Am. 2004. 48(viii):513–30.

5.Kang DW. Fixed prosthodontics. 1st ed.DanhanNarae Publishing: Seoul;2012. p. 330.

6.Okutan M., Heydecke G., Butz F., Strub JR. Fracture load and marginal fit of shrinkage-free ZrSiO4 all-ceramic crowns after chewing simulation. J Oral Rehabil. 2006. 33:827–32.

7.Hjerppe J., Vallittu PK., Fröberg K., Lassila LV. Effect of sintering time on biaxial strength of zirconium dioxide. Dent Mater. 2009. 25:166–71.

8.Kunii J., Hotta Y., Tamaki Y., Ozawa A., Kobayashi Y., Fujishima A., Miyazaki T., Fujiwara T. Effect of sintering on the marginal and internal fit of CAD/CAM-fabricated zirconia frameworks. Dent Mater J. 2007. 26:820–6.

9.Bolton WA. The clinical application of a tooth size analysis. Am J Orthod. 1962. 48:504–29.

10.Kim EJ., Hwang HS. Reproducibility and accuracy of tooth size measurements obtained by the use of computer. Korean J Orthod. 1999. 29:563–73.

11.Sim EJ., Hwang HS., Moon JD. A study on the error of tooth size measurements. Korean J Orthod. 1999. 29:491–502.

12.Kim DS., Kim YJ., Choi JH., Han JH. A study of Korean norm about tooth size and ratio in Korean adults with normal occlusion. Korean J Orthod. 2001. 31:505–15.

13.Lee SP. Dental anatomy. 1st ed.DanhanNarae Publishing: Seoul;2009. p. 46.

Fig. 1.

3D volume was projected on each plane. The outer line was measured through external tangent line, and inner line was measured through inflection point of tangent line using Mimics auto setup. (A) Transverse Plane, (B) Frontal Plane, (C) Sagittal Plane.

Fig. 2.

Mesiodistal length (X) of incisal group in transverse plane is (6.98 ± 1.05 mm, Max = 11.05 mm), buccolingual length (Y) is (7.39 ± 1.05 mm, Max = 9.84 mm).

Fig. 3.

Mesiodistal length (X1) of incisal group in frontal plane is (7.50 ± 1.15 mm, Max = 11.04 mm), crown height (Y) is (9.61 ± 1.17 mm, Max = 12.80 mm).

Fig. 4.

Mesiodistal length (X2) of prepared incisal group in frontal plane is (2.98 ± 0.73 mm, Min = 1.39 mm), crown height (Y2) is (6.60 ± 1.05 mm, Min = 4.11 mm).

Fig. 5.

Buccolingual lenth (X1) of incisal group in sagittal plane is (6.88 ± 0.88 mm, Max = 4.04 mm), crown height (Y1) is (9.61 ± 1.17 mm, Max = 9.62 mm).

Fig. 6.

Buccolingual lenth (X2) of prepared incisal group in sagittal plane is (2.04 ± 0.73 mm, Min = 0.93 mm), crown height (Y2) is (6.75 ± 1.09 mm, Min = 4.24 mm).

Fig. 7.

Mesiodistal length (X) of premolar group in transverse plane is (8.01 ±1.47 mm, Max = 12.03 mm), buccolingual length (Y) is (9.74 ±1.18 mm, Max = 13.33 mm).

Fig. 8.

Mesiodistal length (X1) of premolar group in frontal plane is (8.01 ± 1.46 mm, Max = 12.09 mm), crown height (Y) is (8.01 ± 1.48 mm, Max = 11.07 mm).

Fig. 9.

Mesiodistal length (X2) of prepared premolar group in frontal plane is (4.10 ± 1.78 mm, Min = 1.97 mm), crown height (Y2) is (5.37 ± 1.49 mm, Min = 3.67 mm).

Fig. 10.

Buccolingual lenth (X1) of premolar group in sagittal plane is (9.76 ± 1.22 mm, Max = 13.48 mm), crown height (Y1) is (8.01 ± 1.48 mm, Max = 11.07 mm).

Fig. 11.

Buccolingual lenth (X2) of prepared premolar group in sagittal plane is (5.86 ± 1.55 mm, Min = 2.86 mm), crown height (Y2) is (5.38 ± 1.33 mm, Min = 4.07 mm).

Fig. 12.

Mesiodistal length (X) of molar group in transverse plane is (10.87 ± 1.04 mm, Max = 12.63 mm), buccolingual length (Y) is (11.41 ± 1.18 mm, Max = 13.33 mm).

Fig. 13.

Mesiodistal length (X1) of molar group in frontal plane is (10.62 ± 1.25 mm, Max = 12.44 mm), crown height (Y) is (8.15 ± 1.17 mm, Max = 10.65 mm).

Fig. 14.

Mesiodistal length (X2) of prepared molar group in frontal plane is (6.80 ± 1.18 mm, Min = 4.44 mm), crown height (Y2) is (5.11 ± 1.29 mm, Min = 3.38 mm).

Fig. 15.

Buccolingual lenth (X1) of molar group in sagittal plane is (11.53 ± 1.18 mm, Max = 13.48 mm), crown height (Y1) is (8.12 ± 1.19 mm, Max = 10.59 mm).

Fig. 16.

Buccolingual lenth (X2) of prepared molar group in sagittal plane is (7.34 ± 1.40 mm, Min = 4.09 mm), crown height (Y2) is (5.15 ± 1.23 mm, Min = 3.63 mm).

Fig. 17.

Comparison of milling area between conventional zirconia block (A) and customized zirconia block (B).

Table 1.

The mean dimension of natural dentition of Korean (Unit: mm)

Tooth number	1	2	3	4	5	6	7
Crown height	10.5	9.5	10.0	8.5	8.5	7.5	7.0
Mesiodistal length	8.5	7.0	7.5	7.5	7.0	10.5	9.5
Buccolingual length	7.0	6.5	8.0	9.5	9.0	11.0	11.0

Table 2.

The mean length of each tooth group sorted by each planes (unit: mm)

	Transverse plane	Frontal plane	Sagittal plane
Incisals (N = 57)		MD = 7.50 ± 1.15	BL = 6.88 ± 0.88
	MD = 6.98 ± 1.05	CH = 9.61 ± 1.17	CH = 9.61 ± 1.17
	BL = 7.39 ± 1.05	MDP = 2.98 ± 0.73	BLP = 2.04 ± 0.73
		CHP = 6.60 ± 1.05	CHP = 6.75 ± 1.09
Premolars (N = 15)		MD = 8.01 ± 1.46	BL = 9.76 ± 1.22
	MD = 8.01 ± 1.47	CH = 8.01 ± 1.48	CH = 8.01 ± 1.48
	BL = 9.74 ± 1.18	MDP = 4.10 ± 1.78	BLP = 5.86 ± 1.55
		CHP = 5.37 ± 1.49	CHP = 5.38 ± 1.33
Molars (N = 13)		MD = 10.62 ± 1.25	BL = 11.53 ± 1.18
	MD = 10.87 ± 1.04	CH = 8.15 ± 1.17	CH = 8.12 ± 1.19
	BL = 11.41 ± 1.18	MDP = 6.80 ± 1.18	BLP = 7.34 ± 1.40
		CHP = 5.11 ± 1.29	CHP = 5.15 ± 1.23

MD = medisodistal length, BL = buccolingual length, CH = crown height, MDP = mesiodistal length of prepared tooth, BLP = buccolingual length of prepared tooth, CHP = crown heigh of prepared tooth.

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