Advice 1: How often should I change crowns

Installation of crowns is one of the ways to restore damaged teeth. They are used to restore the tooth to strengthen it and to improve its aesthetic appearance. However, once is not enough to put the crown. Periodically they must be replaced.
How often should I change crowns



The rate of change of crowns depends on the material from which they are made. The most commonly used metal, ceramic and metal-ceramic crowns. Of metal crowns in Russia, the most common steel-plated titanium and gold. Crowns are made of different techniques, from which also depends on their lifetime. Gold falling faster than steel, so their owner needs to be especially attentive to their teeth. Preferably after four or five years of wearing crowns to visit a doctor who will examine you and say, is it not time to change them.

Ceramic crowns, they are the same in common – porcelain, have high aesthetics. They mimic the transparency of the tooth, do not absorb dye and can not be erased. Their only disadvantage is low strength. Often ceramic crowns are used on front teeth where you want the most natural look with minimal loads. The owner of the porcelain crowns should worry about replacing them after eight to ten years.

In the metal-ceramic crowns, first made a steel frame to which the subsequently added ceramic. This tooth has a and durability, and a decent aesthetic look, only slightly less in this all-ceramic crowns. The main disadvantage of these crowns is that they wear out the adjacent teeth. Similar crowns can last up to fifteen years.

Even if the life of the crown has not yet passed, signal that it is time to change, will be inflamed gums "repaired" tooth stuck pieces of food, bare roots. In addition, the physician must regularly inspect the tooth wearing a crown. If no change in the dental cavity, and the tooth is healthy, as long as you don't have to worry about replacing the crown.


Advice 2: How to change the bearings in the bike

Bikes are extremely popular today. Like any transport, they can fail. If you decide to replace the bearings, the work can be performed independently. The replacement procedure consists of several stages.
bikes
You will need
  • tools, new bearings
Instruction
1
If we talk about the bearings, they are the most vulnerable part of the bike. The vehicle has several bearing units. They are in the front fork and in the saddle, the pedals and the wheels.
2
This files most often out of order, bearings in the carriage which provides the rotation of the pedals. This bearing unit is at the bottom of the frame.
3
Suppose you need to get to the bearings of the carriage. Flip the bike and remove both connecting rod. For this purpose, the wedges loosen the nuts and remove them. Note that all work must be performed slowly, so as not to confuse nuts and Bicycle parts.
4
Sometimes loosen the nuts very difficult. In this case, set the wooden bar to the threaded part and tap with a hammer. Please note that the work should be done without effort not to damage the nodes of the bike.
5
After you remove the anthers. You should clean it thoroughly. Pollution and effects of water quickly eliminate the bearings in the carriage down.
6
Install in the grooves of the carriage, a special key and remove the left Cup. Pull it together with the bearing. Gently pull it out of the slot of the frame. Then replace and perform all operations in reverse order.
7
After completion of the Assembly process to adjust the bearing. The connecting rods should rotate freely. The axial displacement should not be.
8
If you have decided to replace the bearings in the front fork, remove the wheel. Then gently Unscrew the head of the bolt holding the steering wheel. Remove it by unscrewing the locknut.
9
Under the nut is a light hook or washer. Remove it, then Unscrew the top Cup. You will gain access to the clip that holds the bearing.
10
On some models of Bicycle balls in the cups are without cage. Because of this, you should be sure to hold the plug crown at the moment of loosening of the locknut. So balls will not fall apart.
11
By removing the top Cup, tilt the bike to one side. So you can gently pour the balls. Then remove the plug from the head pipe.
Dismantling the plug, flush with kerosene cups and balls. Wipe dry.
12
Buy petroleum jelly and smear it thickly over the Cup. If you saw at least one balloon popped or rusted, change the whole set. The fact is that the difference of the diameters of the balls leads to their rapid wear.
13
Completing Assembly, carefully lay the balls in the track of the Cup. Then enter the pipe frame stem fork and press it to the bottom of the Cup cone crown.
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