What is the Spider Screw made of?
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| Is the Spider Screw packaged sterile?
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| During the procedure the screw is coming loose. I tried switching from 1.5mm to 2.0mm then I switched locations. Is this typical?
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| I am reluctant to administer an injection of local anesthetic, is it necessary?
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In one case I tried immediate loading and in another I did not load right away, which procedure is correct?
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If you are pre-drilling prior to spider screw placement, what RPM's should be used with the low speed handpiece?
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What is the pitch of the Spider Screws?
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How is the Spider Screw removed?
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I use long neck Spider Screws (2mm) and have encountered several cases where the tissue was deep in the posterior area and it is growing over the screw head, have you thought of an even longer neck height Spider Screw, possibly 3mm?
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What is the Spider Screw made of?
The Spider Screws are made from the purest medical Grade 5 Titanium Alloy. Grade 5 Ti 6Al-4V ELI is known for its high strength, light weight, and corrosion resistance. It is most commonly used in medical and aerospace applications. As interstitials, the elements oxygen, nitrogen, and carbon have been reduced beyond the standard titanium alloy requirements in order to improve the ductility and fracture toughness of the alloys.
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Is the Spider Screw packaged sterile?
Yes. The Spider Screws have been cleaned, decontaminated, and sterilized via gamma radiation. Should the screw become contaminated prior to placement, simply clean, bag, and process the screw according to normal sterilization protocol.
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During the procedure the screw is coming loose. I tried switching from 1.5mm to 2.0mm then I switched locations. Is this typical?
Failure of the Spider Screw is not typical; the average failure rate is only 7%. If there is a mobile screw we recommend changing the placement site instead of using a larger size screw. Also, always choose the longest screw the area can accommodate, as we rely on simple mechanical retention not osseointegration.
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I am reluctant to administer an injection of local anesthetic, is it necessary?
Placement of the Spider Screw in most cases does not require nerve block or local anesthesia. The use of a topical anesthetic applied directly to the screw placement site will suffice. Place the topical anesthetic onto dry mucosa for 2-3 minutes, peak anesthesia is usually achieved in 5-10 minutes and will last for approximately 20-30 minutes.
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In one case I tried immediate loading and in another I did not load right away, which procedure is correct?
The Spider Screw is designed to be loaded immediately. One of the main advantages of miniscrews is they can placed and loaded at the same visit, with very little or no discomfort to the patient. The force levels applied can range from 50 – 300 grams depending on the quality of the bone and the desired orthodontic movement.
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If you are pre-drilling prior to spider screw placement, what RPM's should be used with the low speed handpiece?
Maintain a speed of about 100 RPM's when using low speed handpiece to perforate the tissue and bone.
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What is the pitch of the Spider Screws?
The pitch is exactly how far the screw will go in with each full rotation (every 360° degrees).
K1 and C1 pitch = 0.7mm
K2 and C2 pitch = 1.0mm
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How is the Spider Screw removed?
The Spider Screw is simply unscrewed using the appropriate screwdriver or handle driver. The technique best suited, is to alternate between unscrewing and screwing until the screw is completely removed from the bone. This can usually be accomplished without local anesthesia; however individual patient sensitivity may require the use of a topical anesthetic.
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I use long neck Spider Screws (2mm) and have encountered several cases where the tissue was deep in the posterior area and it is growing over the screw head, have you thought of an even longer neck height Spider Screw, possibly 3mm?
Thank you for your suggestion, I’m also using mostly long neck miniscrews in the posterior areas. If I am using in the molar areas or in the tuberosity, I use the C2 (2mm) long neck 11mm Spider Screws as they have a higher and a larger head. The large head allows the soft tissue to stay apart better than the K1 or K2. Furthermore, if the tissues are very thick I leave some threads out from the bone and this automatically provides a longer neck. In the case of a 3mm neck height we should consider the probability of the lever effect on the infrabony portion which can affect the miniscrew’s stability. It is my opinion that a longer neck could be useful in limited situations, but in my experience not very frequently.
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