Effect of different pattern size and pattern shape on castability of commercially pure titanium

Yoon-Jeong Seo; Gye-Jeong Oh; Hyo-Il Lee; Yoo-Jin Shin; Hong-Joo Kim; Sang-Won Park

doi:10.4047/jkap.2013.51.4.261

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Seo, Oh, Lee, Shin, Kim, and Park: Effect of different pattern size and pattern shape on castability of commercially pure titanium

ORIGINAL ARTICLE

J Korean Acad Prosthodont 2013;51(4):261-268.

Published online: NaN October 2013

DOI: https://doi.org/10.4047/jkap.2013.51.4.261

Effect of different pattern size and pattern shape on castability of commercially pure titanium

Yoon-Jeong Seo, MSD¹, Gye-Jeong Oh, PhD, MSD², Hyo-Il Lee, MSD¹, Yoo-Jin Shin, MSD¹, Hong-Joo Kim, DDS, MSD³, Sang-Won Park, DDS, MSD, PhD^1,^2,^∗

^¹Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, Korea

^²RIS Foundation for Advanced Biomaterials, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju, Korea

^³Prosthodontic Clinic, Daejeon Sun Dental Hospital, Daejeon, Korea

∗Corresponding Author: Sang-Won Park Department of Prosthodontics, School of Dentistry, Chonnam National University, 300 Yongbong-Ro, Buk-gu, Gwangju, 500-070, Korea +82 62 530 5638: e-mail, psw320@chonnam.ac.kr

Received 8 August 201326 August 2013 Accepted 16 September 2013

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

The purpose of this study was to investigate the effect of geometrically different wax pattern shapes and sizes on the castability of Grade2 Cp-Ti (commercially pure titanium).

Materials and methods

Total of 40 mesh wax pattern (61 mm × 24 mm, 207 grids), (61 mm × 17 mm, 138 grids) was cast in this experiment. Depending on the geometrical shape of the wax pattern, 8 groups was organized; Flat, Semicircular, Horse-shoe and V-shape, each consisting 5 samples. Runner-bar sprue was used in all patterns. The number of completely cast grid in wax pattern served as a measure for the castability of comercially pure titanium.

Results

The mean value of square count in each group was as followed; 133.20 squares in group SS (96.52%), 132.40 squares in group SH (95.94%), 132.00 squares in group SF (95.65%), 127.60 squares in SV (91.43%), 198.60 squares in group LF (95.94%), 197.80 squares in group LV (95.56%), 196.40 squares in group LS (94.88%), and 188.00 squares in group LH (90.82%).

Conclusion

Within the limitations of this study the results indicate that there were no sttistically significant difference in castability of titanium regarding wax pattern shape (P>.05). However, Small size wax patterns were showing the noticeable castability more than Large size pattern. (J Korean Acad Prosthodont 2013;51:261-8)

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Keywords: Titanium, Castability, Wax pattern, Size, Shape, Sprue

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Fig. 1.

Schematic represntation of pattern size. A: Small, B: Large.

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Fig. 2.

Stone block indexes used for fabricating wax patterns. A: Semicircular, B: Horse-shoe, C: V-shape.

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Fig. 3.

Wax patterns of each group. A: Flat, B: Semicircular, C: Horse-shoe, D: V-shape.

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Fig. 4.

Preheating schedule of the invested molds.

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Fig. 5.

Titanium castability of shapes and size on the wax pattern.

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Fig. 6.

Sample of casted mesh patterns. A: Small Flat, B: Small Semicircular, C: Small Horse-shoe, D: Small V-shape, E: Large Flat, F: Large Semicircular, G: Large Horse-shoe, H: Large V-shape.

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Table 1.

Experimental groups used in this study

Pattern size	Pattern design	Code (n = 5)
Small (138 Grids)	Flat	SF
	Semicircular	SS
	Horse-shoe	SH
	V-shape	SV
Large (207 Grids)	Flat	LF
	Semicircular	LS
	Horse-shoe	LH
	V-shape	LV

Table 2.

Castability measurements of specimens

Group		N	Mean	SD	Max	Min	Reproducibility (%)
SF		5	132.00	5.66	137	123	95.65
SS	Small	5	133.20	3.96	138	128	96.52
SH	(138 Grids)	5	132.40	3.51	138	129	95.94
SV		5	127.60	7.50	138	121	92.46
	Average		131.30	5.16	-	-	95.14
LF		5	198.60	4.93	205	192	95.94
LS	Large	5	196.40	6.58	205	187	94.88
LH	(207 Grids)	5	188.00	14.32	201	169	90.82
LV		5	197.80	7.73	206	187	95.56
	Average		195.20	8.39	-	-	94.30

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