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A STUDY ON THE EFFECTS OF CAVITY FORMS ON FRACTURE OF AMALGAM RESTORATION IN DECIDUOUS MORTARS

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Abstract

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Ä¡¾Æ¿ì½ÄÁõÀÌ ¾ø´Â »ó¡¤ÇÏ¾Ç À¯±¸Ä¡ 80°³·Î ¿Íµ¿ÀÇ ÇùºÎ¸¦ ±³ÇÕ¸é Ä¡¾Æ±³µÎ°£ ³ÐÀÌ 1/3°ú
1/4·Î ÇÏ°í, internal line angleÀ» ¿¹°¢°ú µÕ±Û°ÔÇÏ¿©, Instron universal testing machine
(Model 1132)À¸·Î ±× ÆÄÀýÇÏÁßÀ» ÃøÁ¤ ºñ±³ÇÑ °á°ú ¾Æ·¡¿Í °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1) ÇùºÎ ³ÐÀÌ°¡ Ä¡¾Æ ±³µÎ°£ ³ÐÀÌ 1/3±ºÀÌ 1/4±ºº¸´Ù °úÀýÇÏÁß¿¡ Àß °ßµð¾úÀ¸¸ç ƯÈ÷ »ó
ÇÏ¾Ç Á¦ 2À¯±¸Ä¡¿¡¼­ ¶Ñ·ÇÇÏ¿´´Ù.
2) internal line angleÀ» µÕ±Û°Ô ÇÑ ±ºÀÌ ¿¹°¢À¸·Î Çü¼ºÇÑ ±ºº¸´Ù ÆÄÀýÇÏÁß¿¡ Àß °ßµð¾î³Â
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ÀÌ»óÀÇ °á°ú¿¡ µû¸£¸é ÇùºÎ ³ÐÀÌ°¡ Ä¡¾Æ ±³µÎ°£ 1/3ÀÌ°í internal line angleÀÌ µÕ±Ù ±ºÀÌ
ÆÄÀýÇÏÁß¿¡ °¡Àå Àß °ßµð¾î ³ÂÀ¸¸ç, ÇùºÎ ³ÐÀÌ°¡ 1,/4ÀÌ°í internal line angleÀÌ µÕ±Ù ±ºµµ
±³ÇÕ·ÂÀÇ ¹üÁÖ³»¿¡¼­´Â ÆÄÀý¿¡ ´ëÇØ °ßµð¾î³¾ ¼ö ÀÖÀ¸¹Ç·Î ½ÇÁ¦ ÀÓ»ó¿¡¼­ ¹Þ¾Æµé¿©Áú ¼ö ÀÖ
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In this experiments, the fracture loads were measured and analysed by using of
Instron universal testing machine (Medoel 1132).
With 80 upper and lower deciduous molars that were free of dental caries.
Isthmus of teeth were prepared to 1/3 and 1/4 of intercuspal width, and infernal line
angles with round and sharp shape, and then amalgam restoration were performed.
The results of this study were as follows ;
1. Resistance to fracture loads were seater with isthmus of 1/3 intercuspal width than
of 1/4 intercuspal width, especially, statistically significant difference on upper and lower
second deciduous molars.
2. Resistance to fracture loads were greater with rounded internal lie angle than sharp
internal line angle.
The above results were as follows, the fracture loads had greater resistance on
isthmus of its intercuspal width, and rounded interval line angle, but normal
physiological occlusal forces could permit isthmus of 1/4 intercuspal width and rounded
internal line angle.

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