If a tooth with a gold crown breaks, it is generally because the underlying tooth structure has fractured or decayed. Gold crowns are not immune to becoming loose, especially if you are eating foods and candy that are harmful to crowns and bridges. Gold crowns also cause the least wear on the opposing tooth.
Making the world better, one answer at a time. An artificial boundary is a boundary made by humans, examples include dams, the fence at the border between the U.S and Mexico. A natural boundary is a boundary made by nature, a boundary that happens naturally, examples include rivers, mountains and such.
On the MMPI thin boundaries are associated with high scores on the paranoia scale, and in males with high femininity and low defensiveness. Thin boundaries in males are therefore associated with willingness to accept feminine aspects of the self, whereas men with thick boundaries recognize that men are men, women are women. Dreaming