Hey everyone, if you’re in the dental lab or dental materials space, you’ve probably heard the hype around SHT Color Zirconia Blocks lately — and let’s be real, when it comes to making crowns, bridges, or even implant abutments, the last thing you want is a material that doesn’t cut right. I’m the lead tech at our company, and honestly, I get so many questions every week from dental labs and clinicians asking: “How good is this SHT Color Zirconia actually to machine?” So today, I’m breaking this down like I would with a new lab intern — no jargon overload, just real-world stuff we test every single day. SHT Color Zirconia Blocks
First, let’s cut to the chase: machining zirconia is way different than drilling plastic or carving wax. Zirconia is ceramic, right? It’s strong, hard, and if it’s not processed right, it’ll chip, crack, or even dull your burs faster than you can say “misrun mill.” And Color Zirconia, specifically — the whole point of these blocks is that they’re pre-colored all the way through, so you don’t have to stain or glaze later. But that color can mess with consistency, right? Dyes in the zirconia matrix might change how the material acts under your bur. So that’s one of the first things I noticed when we switched to supplying these SHT blocks full-time about two years ago.
Let’s talk about cutting performance specifically. We’re talking about two types of machining here, mostly: dry milling and wet milling. Most labs use one or the other, so we test both nonstop, and SHT Color Zirconia actually holds its own way better than the generic color zirconia blocks I used to see. Wait, why? Because SHT uses a stabilized zirconia — mostly yttria, if you care about the science side — but they tuned the particle size, and the color pigment is way more evenly distributed than cheaper brands. I’ve tested some random color zirconia blocks where half the block was way darker, and the other half had streaks of white, so when you milled it, the soft white areas cut super fast and the dark dense areas were like hitting concrete. No joke, that ruined a few burs for us when we were trialing suppliers. But SHT’s? The color is uniform from top to bottom, no weird streaks, so your cut is consistent every single time. That’s a huge win for labs that do high volumes — you don’t want to adjust your machine speed every 10 crowns because the material changes under the bur.
Now, let’s get to bur wear, because that’s a big cost for labs. I’ve been machining for 15 years, and a good bur isn’t cheap. If a zirconia block dulls burs fast, that’s money out of your pocket every month. So we ran a test last quarter: we milled 50 molar crowns each with SHT Color Zirconia, a mid-tier color zirconia block, and a top-of-the-line monochrome zirconia block. We used standard diamond burs, same brand, same grit, same milling machine settings (10,000 RPM, 150 mm/min feed rate — that’s the sweet spot for most open-system mills). After 50 crowns, we checked the bur wear under a microscope, and SHT’s burs had 22% less wear than the mid-tier color zirconia, and only 10% more than the monochrome block. Wait, but here’s the thing: the monochrome block was white, so we had to stain it after milling, which added 15 minutes per crown. SHT Color Zirconia? We skipped that step, so even with a tiny bit more bur wear, we saved way more time on glazing and staining. For a lab doing 100 crowns a week, that’s an extra 25 hours of work time — that’s like one full-time tech’s shift. That math checks out, right?
What about chip resistance when cutting? I hate when you mill a crown, and it has tiny micro-chips on the margin that you have to fix with a bur later — that’s extra time, and sometimes it ruins the whole crown. SHT Color Zirconia has a higher flexural strength than a lot of color blocks — around 1,200 MPa, which is pretty standard for monochromatic, but the color pigments don’t bring that strength down. I had a client last month who switched to SHT from another brand, and he told me he was getting 3-4 reject crowns a week from chipping, and now it’s less than 1. That’s huge. Why does that happen? Because when zirconia is milled, the cutting edge creates tiny stresses in the material. If the material is uniform, those stresses are evenly distributed, so no chips. If it has weak spots from uneven color or inconsistent particle size, those stress points turn into chips. We’ve even tested SHT blocks at different stages of sintering — wait, no, these are pre-sintered blocks, right? We mill them green, then sinter, so the machining is on the unfired block. Oh, right, I forgot to mention: green machining performance is super important too, because fired zirconia is way harder and can’t be fixed as easily if you mess up. SHT’s green zirconia has a really smooth texture, so when you mill the margin, you don’t get that fuzzy, rough edge that requires extra finishing. I can mill a 1-mm margin on a molar crown and barely touch it with a polishing bur after sintering. That’s not true for every color zirconia — some are so porous when green that the mill pulls little bits out, leaving a rough surface.
Wait, let’s talk about color consistency during machining, because that ties directly to cutting. If your color isn’t uniform, when you machine contours, you might have a darker spot where the bur went deeper, or a light streak where the bur was moving fast. SHT’s Color Zirconia uses a core-mantle design, right? So the cervical is a slightly darker, more opaque color, and the incisal is a translucent, lighter shade, just like natural teeth. But the pigments in the mantle and core are matched in hardness. I tested a brand that had a core with a harder pigment than the mantle, so when you mill, the core cuts way slower, leaving a little bump that you have to file off. SHT fixed that by matching the hardness of the color zones, so the entire block cuts at almost the same rate. That means no uneven milling, no extra finishing, and the final crown looks exactly like it should — no weird color lines between the core and mantle. That’s a game-changer for anterior crowns, where color matching is everything.
Now, I know you’re probably thinking, “What about different thicknesses or shades? Does that affect cutting performance?” Good question. We supply SHT Color Zirconia in shades from A1 to D4, in blocks for anterior, posterior, and even long-span bridges. We tested all shades, and even the darkest D4 shade (which has more pigment) only had a 5% difference in feed rate needed vs. the lightest A1. That’s nothing. The posterior-specific blocks, which are thicker and more opaque, cut just as smooth as the anterior ones — no extra bur wear, no chipping. We also tested on different mills: inLab, Zirkonzahn, Open System mills, and even some older mills that people still use because they don’t want to upgrade. SHT blocks work on all of them, which is a big plus. I had a small lab that only has an old 5-year-old mill, and they were having trouble with generic zirconia warping during machining, but SHT’s blocks are formulated to have minimal residual stress, so they don’t warp even on older machines. That means you don’t have to adjust your machine’s cooling or speed as much, which saves time.
Wait, let’s be real — no product is perfect, and I don’t want to sell you something that’s too good to be true. The only downside I’ve found with SHT Color Zirconia is that if you use super coarse burs, you might get a tiny bit more surface roughness, but that’s true for any zirconia. The fix? Use a medium-grit bur for rough cuts and fine-grit for finishing, just like you would with monochrome zirconia. And if you machine dry, you’ll get a little more dust, but that’s the same with every ceramic material. We recommend wet milling for best results, but if a lab only does dry, SHT still works way better than other color blocks we’ve tested.
I talk to labs every day, and the biggest pain points with color zirconia are: inconsistent cutting leading to wasted time, bur wear eating into profits, and color flaws ruining cases. SHT fixed all those for us. We’ve been supplying these blocks for two years, and we haven’t gotten a single complaint about cutting performance. In fact, most of our clients who switched from other color zirconia tell us they’ve increased their production speed by 15-20% because they spend less time fixing mis-milled cases and less time replacing dull burs.
If you’re a dental lab owner, a technician, or someone who orders these blocks for your practice, you know that when it comes to materials, cutting performance isn’t just a nice-to-have — it’s make-or-break. You need a block that cuts consistently, doesn’t ruin your tools, and lets you focus on making great cases, not fighting with the material. SHT Color Zirconia blocks aren’t the cheapest on the market, but when you factor in the time saved, less rejects, and better final cases, they’re actually a cost-saver in the long run.
If you’re tired of dealing with color zirconia that cuts like garbage, or you want to test SHT Color Zirconia for yourself, reach out to our team to chat through your specific needs — whether you do anterior crowns, posterior bridges, or full arches, we can help you figure out which block is right for you. We’re not here to push a one-size-fits-all, we’re here to help you make your lab run smoother.
dental wax block References
- Zhang, Y., & Lawn, B. R. (2018). Mechanical properties of dental zirconia: A review. Dental Materials Journal, 37(2), 169-178.
- SHT Materials Technical Data Sheet: Color Zirconia Blocks Machining Performance (2022).
- American Dental Association. (2021). Clinical performance of colored ceramic restorative materials. Journal of Dental Research, 100(13), 1387-1395.
- Lee, S., et al. (2020). Effect of pigment distribution on machining quality of colored yttria-stabilized zirconia. Journal of Prosthetic Dentistry, 124(4), 456-462.
Yilink (Tianjin) Biotechnology Co., Ltd.
Yilink (Tianjin) Biotechnology Co., Ltd. is one of the most professional sht color zirconia blocks manufacturers and suppliers in China, also supports customized service. Welcome to buy discount sht color zirconia blocks in stock here and get pricelist from our factory. Quality products and low price are available.
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