Why I Keep Coming Back to .022 MBT by Dr. Jonathan Dzingle

15 clinical pearls for efficient, predictable finishing

by Dr. Jonathan Dzingle

Recently, I came across a question in an online orthodontic forum asking for tips and tricks to achieve better finishing with the .022 MBT bracket prescription. This post reminded me how much practical knowledge is exchanged in these forums between experienced clinicians practicing around the world.

Orthodontics is a profession of strongly held opinions about optimal bracket prescriptions, slot sizes, wire sequences, and treatment mechanics. Sometimes these conversations become contentious, but they also challenge us to think critically about the efficacy and efficiency of our own treatment modalities. I believe these forums play a critical role in our profession by connecting practitioners and creating a venue to offer unique solutions to lingering clinical dilemmas.

Throughout my career, I have had the opportunity to work with multiple bracket prescriptions, slot dimensions, and ligation techniques. However, I repeatedly find myself returning to .022 MBT because of its versatility and biomechanical flexibility.

That does not mean I think .022 MBT is objectively superior to other bracket prescriptions. On the contrary, clinical literature has demonstrated that excellent results can be achieved with a variety of bracket systems. Here, I’ll explain why I prefer it over other bracket prescriptions and share some of the lessons I’ve learned along the way to use it more efficiently.

A brief history of slot size and the rise of MBT
The .022-inch slot size was not an arbitrary decision. Edward Angle first developed the edgewise appliance in the 1920s, when orthodontic wires were primarily made from relatively soft precious-metal alloys. These alloys required larger cross-sectional dimensions to provide adequate stiffness for three-dimensional tooth movement.^1,2

As stainless steel gradually replaced gold alloys, smaller wire dimensions became more practical. Dr. Cecil Steiner is commonly credited with introducing the .018 edgewise appliance in the early 1950s.² Orthodontic brackets evolved further when Dr. Lawrence Andrews introduced the Straight-Wire Appliance System: a preadjusted edgewise system. In the 1970s, Dr. Ronald Roth subsequently refined Andrews’ initial bracket prescription to reflect his own treatment and finishing philosophy. It wasn’t until the 1990s that the .022 MBT prescription was developed by McLaughlin, Bennett, and Trevisi as a philosophical shift to create a bracket that reflected how teeth behaved under actual clinical conditions.

The most important concept behind the creation of MBT is that the prescription manufactured into a bracket is not necessarily the prescription ultimately expressed by the tooth. Archwire-slot play, manufacturing tolerances, bracket position, tooth morphology, wire material, and mechanics all influence torque expression.³

MBT therefore incorporated deliberate prescription changes, including greater maxillary incisor torque, more negative mandibular incisor torque, and multiple canine torque options. Commonly cited values include +17 degrees for the maxillary central incisor in MBT versus +12 degrees in Roth, and -6 degrees for the mandibular incisor versus -1 degree in Roth.⁴

But why make these changes? McLaughlin, Bennett, and Trevisi recognized that torque is not expressed particularly efficiently through a preadjusted edgewise appliance. A commonly used .019 × .025 stainless-steel working wire in a .022 slot still has meaningful torsional play, so the torque value built into a bracket is not necessarily the torque value ultimately expressed clinically. MBT therefore incorporated additional torque in selected areas to help compensate for this discrepancy and achieve desired tooth positions with less dependence on compensatory wire bending.⁴

The specific changes also reflected predictable clinical problems. Greater maxillary incisor torque was intended to help preserve palatal root torque during mechanics such as space closure and Class II elastic correction, while increased negative mandibular incisor torque helped counter the tendency toward lower incisor proclination during leveling, crowding relief, and Class II mechanics. Multiple canine torque options added flexibility for differences in archform, canine prominence, and extraction versus nonextraction treatment. In other words, MBT attempted to build some of the compensation for real-world orthodontic mechanics directly into the prescription.⁴

Freedom with .022 MBT
One reason I continue to prefer .022 MBT is based on the premise that archwire-to-slot play can provide a biomechanical advantage over .018 Roth by allowing greater freedom of choice when deciding archwire sequence, torque expression, and the use of light-force sliding mechanics.

A typical .017 × .025-inch rectangular working wire in an .018-inch slot has substantially less nominal clearance, a lower critical contact angle, and less torsional play than a .019 × .025-inch working wire in an .022-inch slot. While actual play is more complicated because real brackets and wires vary from their nominal dimensions, the practical difference remains: The .019 × .025/.022 slot combination has more freedom before significant bracket-wire contact occurs.³

For the way I practice, this is an advantage. A .019 × .025 stainless-steel working wire gives me substantial stiffness and three-dimensional control while still preserving enough freedom for space closure, Class II correction, and other sliding mechanics. The trade-off is less immediate torque expression, but I can decide when greater torque engagement becomes clinically necessary rather than having the appliance dictate that decision for me.

There is also a practical reality: Orthodontic treatment does not occur in a laboratory. Patients accumulate plaque, food debris, and tartar around bracket slots, making them more difficult to engage and potentially increasing resistance to sliding. Intraoral exposure and surface debris have been shown to increase friction at the bracket-wire interface.^5,6 While I would not claim that .022 bracket systems are more resistant to debris than .018 systems, I appreciate having additional working clearance rather than operating with extremely tight tolerances.

The prescription is only part of the equation
Bracket prescriptions can become almost tribal: Roth versus MBT, .018 versus .022, conventional versus self-ligating. The reality is more nuanced. Wire sequence, bracket placement, biomechanics, elastics, treatment planning, and the clinician’s ability to correct mid-treatment deviations may influence the final result at least as much as the name printed on the bracket package.

My former orthodontic program director, Dr. Flavio Uribe at the University of Connecticut, used to remind us: “If you profess to be an orthodontic treatment specialist, then you should aim to provide something special.”

That sentiment has stayed with me and made me realize that bracket prescription can help us get closer to the final goal, but it cannot replace the judgment of an astute orthodontist. Here are 15 principles that have made .022 MBT more efficient and predictable in my practice.

15 clinical pearls
1. Not all .022 MBT brackets are the same.
Bracket material, manufacturing technique, slot dimensions, pad design, profile, and mesiodistal width vary among manufacturers. These differences influence bond reliability, wire engagement, and finishing.

I pay particular attention to bracket-pad design, resistance to deformation, and rotational control. Extremely small or low-profile brackets may be aesthetic, but, in my experience, they can make subtle rotational corrections more frustrating.

2. Archform matters.
I try to respect mandibular intercanine width and the patient’s underlying anatomy. From an inventory standpoint, however, stocking every possible archform at every stage is rarely practical.

I tend to favor broader ovoid-to-square forms in many patients. Archwire coordination matters less to me during early stages of alignment, but it becomes critical as larger rectangular wires are introduced and finishing begins.

3. Learn your appliance’s imperfections.
No bracket system is perfect. Study your bracket long enough to recognize recurring tendencies.

With the .022 MBT systems I have used, I generally prefer to cheat slightly mesial-in on the maxillary and mandibular lateral incisors (U2s/L2s) and mandibular canines (L3s). In my hands, this small compensation can help counteract mesial-in rotational tendencies that may appear during space closure, power-chain use, and sliding mechanics.

The important point is not that every clinician should copy that exact compensation. It is that you should know your appliance well enough to anticipate its recurring quirks.

4. Reposition before placing large bends, but remember that NiTi can be bent.
I generally prefer repositioning brackets to large finishing bends. A well-positioned bracket is usually more predictable than an increasingly complicated wire.

That said, NiTi wires can be bent sufficiently for simple vertical step adjustments. I would not treat NiTi like stainless steel or TMA, but a modest vertical step can be useful before a planned repositioning appointment. Improving the vertical position of the tooth first can make the subsequent bracket reposition more accurate and easier to visualize.

5. Be patient when bonding premolars.
Not every available tooth needs a bracket immediately. Incompletely erupted premolars can force compromised vertical placement if bonded too early. Sometimes the most efficient decision is to allow additional eruption, and bond the tooth later in a better position. Mother Nature can occasionally do more between appointments than we can do with additional mechanics.

6. Use lower second molars strategically in deep-bite cases.
When eruption and occlusion permit, I frequently bond lower second molars relatively early in deep-bite cases. Extending leveling mechanics posteriorly can help flatten the curve of Spee and reduce the need for more complicated auxiliaries later. I am often more patient with upper second molars, especially when they remain buccal or incompletely erupted.

7. Build into rectangular wires, but do not assume you must finish in the largest wire.
I want enough rectangular-wire engagement to achieve the torque a case requires, but I do not believe every patient needs to finish in the same wire. Once torque objectives have largely been achieved, smaller rectangular TMA wires such as .017 × .025 or .018 × .025 in a .022 slot can provide useful flexibility and allow the occlusion to settle. The finishing wire should serve the finishing objective, not simply follow a predetermined sequence.

8. Memorize your bracket heights.
Develop a consistent height-gauge protocol and know your preferred measurements. Before curing, compare contralateral teeth. A few seconds of bilateral verification can prevent months of compensatory mechanics or future repositioning.

9. Think transverse, then AP, then vertical.
My default mental sequence is transverse, then anteroposterior, then vertical. These overlap, and every case is different, but the framework keeps treatment organized. A late posterior crossbite is more frustrating to correct with cross-elastics than a transverse discrepancy recognized and treated early.

10. Use simple auxiliaries for severely displaced teeth.
A full bracket is not always the easiest first attachment for an ectopic, rotated, or severely displaced tooth. Eyelets and low-profile bonded tubes can simplify initial engagement. Once alignment improves, the definitive bracket can be placed more accurately.

11. Consider mini-tubes on lower second molars.
Lower second molars often combine poor access with heavy occlusal forces. Mini-tubes can reduce interference and breakage when a full-size bracket is unnecessary. Significant rotation, lingual displacement, or torque requirements may still justify a full bracket.

12. Keep the starting occlusion visible throughout the treatment.
A Class II, Division 1 patient and a Division 2 patient can have very different anterior torque requirements. I like to identify those differences early and keep the patient’s original occlusion highly visible in the chart or clinical header.

Was the patient Division 1 or Division 2? Were the incisors initially proclined or retroclined? Was there severe lower crowding? Was there a deep bite? Was there an asymmetry?

As treatment progresses and the original malocclusion disappears, it is surprisingly easy to forget where the patient started. Keeping that information visible helps me continually reassess torque needs, wire selection, and possible relapse tendencies, particularly in crowded cases.

The question should not simply be, “What wire comes next?” The question should be, “Where did this patient start, where are we now, and what movement is still needed?”

13. Do not ignore small Bolton discrepancies.
Minor tooth-size discrepancies can create major finishing annoyances. When indicated, conservative IPR can resolve persistent spacing, overjet discrepancies, and anterior interferences that mechanics alone will not fix.

I prefer reciprocating IPR with a 1:1 low-speed motor rather than a gear-reduced 4:1 system. Having used both, I simply find the 1:1 setup more efficient in my hands. I also find IPR lubricant useful because it improves movement through the contact and can make the procedure more comfortable. I work incrementally, often in approximately 0.2-mm steps, reassessing contacts and tooth shape as I proceed.

14. Think strategically about hooks.
I like hooks on the mandibular canines and premolars because they give me more Class II and vertical elastic options. I generally find hooks on the maxillary premolars less useful for the mechanics I employ. Order your appliance around the mechanics you actually use, not simply the manufacturer’s default configuration.

15. Reposition early and without hesitation.
If there is one principle I would emphasize above the others, it is this: Do not be afraid to reposition brackets. A poorly positioned bracket creates a problem that follows the clinician through every subsequent wire. Correcting it early simplifies everything that comes afterward.

As alignment improves, treatment should increasingly become a process of arch coordination, torque management, AP correction, elastic wear, and settling, not a continuing battle against errors created during the initial bonding.

Conclusion
I do not choose .022 MBT because I believe the prescription can finish a case for me. I choose it because its combination of slot dimension, prescription, and archwire flexibility gives me a broad biomechanical toolbox.

I can use relatively free sliding mechanics when I want them, increase rectangular-wire engagement when torque becomes important, and transition to more flexible finishing mechanics when the occlusion needs room to settle.

Another orthodontist may accomplish the same objectives beautifully with .018 Roth or another appliance. That is precisely the point. Treatment efficiency comes from understanding your appliance well enough to anticipate what it will do, recognizing when it is not doing what you expected, and correcting small discrepancies before they become finishing problems.

Orthodontics is scientific and mechanical, but it is also artistic. Every patient is different, and no prescription replaces clinical judgment.

One of my favorite lines from Top Gun: Maverick captures the idea well: “Success, now more than ever, comes down to the man or woman in the box.” The same is true in orthodontics.

The prescription is built into the bracket; the result is built by the clinician.

References

1. Coronel-Zubiate FT, Arbildo-Vega HI, Cruzado-Oliva FH, et al. Clinical effectiveness of 0.018-inch vs. 0.022-inch bracket slot size in fixed orthodontic treatment: a systematic review and critical appraisal of the evidence. Front Oral Health. 2026;7:1862036.

2. Kusy RP. Orthodontic biomaterials: From the past to the present. Angle Orthod. 2002;72(6):501–512.

3. Arreghini A, Lombardo L, Mollica F, Siciliani G. Torque expression capacity of 0.018 and 0.022 bracket slots by changing archwire material and cross section. Prog Orthod. 2014;15:53.

4. McLaughlin RP, Bennett JC, Trevisi HJ. Systemized Orthodontic Treatment Mechanics. St. Louis, MO: Mosby; 2001.

5. Arici N, Akdeniz BS, Arici S. Comparison of the frictional characteristics of aesthetic orthodontic brackets measured using a modified in vitro technique. Korean J Orthod. 2015;45(1):29–37.

6. Kumar A, Khanam A, Ghafoor H. Effects of intraoral aging of arch-wires on frictional forces: An ex vivo study. J Orthod Sci. 2016;5(4):109–116.

Jonathan Dzingle, DDS, MDS, is a private practice owner of Great Lakes Orthodontics in northern Michigan, with practices in Petoskey and Gaylord. His clinical interests include efficient fixed-appliance biomechanics, digital orthodontics, and predictable treatment finishing. He completed his orthodontic training at the University of Connecticut and focuses on combining systematic treatment mechanics with individualized clinical decision-making.