Full transcript
0:00Welcome . Today we're looking at a topic
0:03many of you know from your own youth .
0:06Perhaps with a slight shudder , too :
0:09orthodontics .
0:10Hello . Yes , the topic of memories .
0:13Absolutely . Today we want to find out
0:16what really lies behind straightening
0:19teeth . And I can promise you , the
0:22sources you sent us — excerpts from
0:24German dental textbooks — reveal a
0:27world that goes far beyond mere
0:30aesthetics .
0:31Absolutely . When you dive into these
0:33texts , you realize very quickly that
0:35this isn't just cosmetic work .
0:37No , not at all . It is a discipline that
0:39operates at the intersection of
0:41medicine , physics , and , well , almost
0:44engineering . It’s about biomechanics ,
0:47growth control , and ultimately the
0:50restoration of function — the complex
0:53diagnostics involved , and of course ,
0:56the " how , " the amazing tools and
0:59techniques used . So , we are taking a
1:02deep dive into the logic of
1:03straightening .
1:04And we will see that it involves an
1:07incredibly complex interaction of teeth
1:10, jawbones , and , what many don't know ,
1:13even daily habits . The sources show a
1:16very structured , almost algorithmic
1:19path from the initial assessment to the
1:22long-term stabilization of the result .
1:25Okay , let's unpack this . When I think
1:28of orthodontics , I immediately get an
1:30image of crooked teeth . But the sources
1:33make it clear that the problems are far
1:34more multifaceted . How do you even
1:36begin to sort out this chaos in the
1:38mouth ?
1:39Mhm . What are the fundamental
1:41malocclusions that are distinguished ?
1:44Well , the texts clearly differentiate
1:46between two levels . The first , most
1:49obvious level , is purely dental
1:51malocclusions . That concerns the
1:54position of individual teeth .
1:55Okay ,
1:56a tooth might have a rotation , for
1:58example , twisted around its own axis ,
2:01or a tipping , meaning it's tilted
2:04forward or backward , or in some cases ,
2:07it's impacted . That means the tooth is
2:10stuck in the jaw and doesn't even erupt
2:12. So that’s the micro-level , the
2:14individual tooth , but the problem is
2:16often bigger . It affects the entire
2:18bite .
2:19Exactly . And that’s the second level :
2:22jaw anomalies . They are also called
2:24dysgnathias . Here , the position of the
2:26jaws in relation to each other is
2:27incorrect . The sources use terms like
2:30prognathism when a jaw protrudes too
2:32far in relation to the cranial base .
2:35Ah , I see .
2:35Or retrognathism , when it is set too
2:38far back . This can affect the upper jaw
2:40, the lower jaw , or both . And naturally
2:43, it has massive effects on the facial
2:45profile and chewing function .
2:46That almost sounds like a coordinate
2:49system for the mouth . And to
2:51systematically record this relationship
2:53between the dental arches , there must
2:56surely be a standard , right ?
2:57One name keeps popping up in the
2:59sources . Angle .
3:01Yes , and that is absolutely central .
3:03The Angle classification is still the
3:06global gold standard today , over 100
3:08years after its development .
3:11Really ? Still today ?
3:12Yes , for describing the bite position
3:15in the sagittal plane . So , when you
3:18look at it from the side , it describes
3:20how the first molars , the so-called
3:22six-year molars , of the upper and lower
3:25jaw relate to each other . But wait a
3:28minute , over 100 years old . In an era
3:31where we work with 3D scans and digital
3:34planning , does such an old system still
3:37hold up , or is it more of a historical
3:39relic that you just happen to learn ?
3:43That is a valid question , and the
3:46answer is sort of both . It is , of
3:49course , a simplification because it
3:51only looks at one plane , but for fast ,
3:54basic , and crucially , universally
3:56understandable communication , it is
3:58irreplaceable . Class 1 is the ideal
4:01state , the neutral bite .
4:05Okay , here the front cusp of the upper
4:07molar fits exactly into the central
4:09groove of the lower one . In Class 2 ,
4:12the distocclusion , the entire lower jaw
4:15is positioned too far back in relation
4:17to the upper jaw . The lower molars are
4:20therefore biting behind their ideal
4:23position .
4:24And there are sub-classifications for
4:26that , right ? That wasn't everything .
4:28Exactly . In Class 2 , Division 1 , the
4:31upper front teeth are tipped forward .
4:34This often leads to a large gap between
4:37the incisors , the so-called increased
4:39overjet .
4:41Division 2 is trickier . The upper
4:43incisors are tipped steeply inward and ,
4:46so to speak , cover the lower ones . That
4:49is called a deep bite . It often goes
4:51hand in hand with a deep bite where you
4:53can barely see the lower incisors
4:55anymore . And Class 3 is then the exact
4:57opposite ,
4:58logically . Yes ,
5:00that is the mesiocclusion , where the
5:02lower jaw sits in front of the upper
5:04jaw . Okay . And here I stumbled upon
5:06something in the sources that really
5:08made me sit up and take notice . A
5:10specifically German system that decides
5:13whether treatment is medically
5:15necessary and covered by health
5:17insurance . The Orthodontic Indication
5:20Groups . KIG for short .
5:22Mhm . Wait a minute , that is a decisive
5:24point . The sources reveal that in
5:27Germany , it is not primarily about the
5:29desire for a Hollywood smile , but about
5:32a hard-hitting , millimeter-precise
5:34medical necessity . That is a completely
5:36different philosophy than in many other
5:38countries , isn't it ?
5:39Absolutely . That is the core of the
5:42German statutory health insurance
5:44system in this area . The IOTN system
5:46classifies the severity of a
5:48misalignment into 5 grades , and a claim
5:51for coverage only exists for grades 3 ,
5:544 , or 5 . The sources provide very
5:57precise , almost legalistic definitions
5:59for this .
6:00On one hand , this sounds very objective
6:02and fair , but on the other hand , it is
6:04terribly bureaucratic ; does such a
6:06rigid system lead doctors to look more
6:09at the millimeter count for insurance
6:11than at the individual patient's
6:13well-being , who might be just on the
6:15borderline ? That debate is certainly
6:17taking place , but the basic idea is to
6:20create an objective , measurable
6:22foundation . Let's take the overjet
6:25again , meaning the distance between the
6:27incisors .
6:28Yes , good example .
6:29An overjet of more than 3.5 to 6 mm ,
6:31where the lips can no longer be closed
6:34in a relaxed position , falls into grade
6:373 . That is a borderline case that
6:39justifies treatment . An overjet of over
6:426 to 9 mm is then clearly grade 4 . The
6:46same applies to a deep bite , where the
6:48lower incisors bite into the palate and
6:50injure the mucous membrane there . That
6:53is a clear medical indication
6:55and therefore eligible for
6:56reimbursement .
6:57Exactly . It is about distinguishing
6:59functional impairments from purely
7:01aesthetic wishes .
7:03A truly German approach . But where do
7:06all these misalignments come from ? Is
7:08it all predisposition and bad luck ? Not
7:10only , and that is an incredibly
7:12important point in the sources ; a large
7:15part of the problems are acquired ,
7:17specifically through so-called habits .
7:20Habits ,
7:21meaning harmful habits , usually in
7:24childhood .
7:25What kind of habits are those ?
7:27The absolute classic is thumb sucking .
7:30If a child sucks intensely beyond the
7:33age of three , the thumb permanently
7:36pushes the upper jaw forward and upward
7:38. Oh
7:39boy . and simultaneously inhibits the
7:41growth of the lower jaw . The result is
7:44often an open bite , where the front
7:47teeth gape apart like a Gothic arch and
7:50can no longer bite together .
7:52Wow . Another example is an incorrect
7:55swallowing pattern . Normally , the
7:57tongue presses against the palate when
7:59swallowing . With a visceral swallowing
8:01pattern , however , it presses against
8:03the front teeth during every one of the
8:05approximately 2,000 swallowing acts per
8:08day , pushing them slowly but surely
8:10forward .
8:102,000 times a day . That is fascinating .
8:14That means the orthodontist acts more
8:17like a behavioral coach in some cases .
8:21They try to break deep-seated patterns
8:24before even reaching for the hard tools
8:27. Isn't that the much more sustainable
8:29approach ?
8:30Definitely . You always try to eliminate
8:33the root cause first . The sources
8:36describe here , for example , the
8:37vestibular plate .
8:39Sounds interesting . It is a very simple
8:41, loose plastic shield that you place
8:43between the lips and the teeth . It
8:46prevents sucking and forces the tongue
8:48and lip muscles to reorganize
8:50themselves . Sometimes that alone is
8:53enough to correct a developing
8:54misalignment .
8:55Really ?
8:56Yes . And for more complex functional
8:59disorders like incorrect swallowing ,
9:02speech therapy is also recommended to
9:05actively retrain muscle function . There
9:08are cases where simply breaking such a
9:10habit has made an impending complex
9:13treatment with fixed braces unnecessary
9:15. That is a huge lever . So if these
9:18habits are the problem and you address
9:21them with such a vestibular shield , is
9:23that the first step in the
9:25orthodontist’s toolbox , or do you
9:27clearly separate that from the
9:30appliances that actually move teeth ?
9:32It's a fluid transition , but you can
9:35see it as the first stage of the
9:38toolbox . The sources roughly divide the
9:41actual therapeutic tools into two main
9:43groups . First , the removable appliances
9:47. Removable braces .
9:48Exactly . For one , there are the classic
9:51plate appliances , those colorful
9:53removable braces . They often have
9:56integrated screws to expand the jaw or
9:58springs to move individual teeth . They
10:02are also used as space maintainers if a
10:04baby tooth falls out too early .
10:06And the second type of removable braces
10:08, they almost sound a bit magical .
10:10Functional orthodontic appliances .
10:13Yes , the FKO appliances . The concept is
10:16really exciting . These appliances , such
10:19as the Bionator or the Activator , lie
10:21completely loose in the mouth .
10:24Loose ? How does that even work ?
10:27They don't exert any force themselves ,
10:29but instead use the body’s own muscle
10:31power from the tongue , lips , and cheeks
10:33. They position the lower jaw in a new
10:36forward position , and the muscles and
10:39growing bone tissue then adapt to this
10:41new position . So you are essentially
10:44reshaping jaw growth using your own
10:46body's forces .
10:47Patients who are still in the growth
10:49phase . I see . And then we come to the
10:53second large group that everyone knows
10:55and probably fears a little bit : fixed
10:58appliances . Exactly , the multi-band or
11:00multi-bracket appliance . At its core ,
11:04it consists of three components : the
11:06brackets , which are the small metal or
11:09ceramic plates precisely bonded to the
11:11teeth .
11:12Everyone knows those . Then the bands ,
11:14which are metal rings cemented like a
11:17belt around the large molars to create
11:20a rock-solid anchor . And the most
11:22important component , the arches , the
11:25wires that run through the brackets and
11:27generate the actual force for tooth
11:29movement . Regarding these arches , there
11:32is a detail in the sources that really
11:34blew me away . It talks about first - ,
11:37second - , and third-order bends . That
11:39finally sounds like engineering . It
11:42absolutely is . These three orders are
11:45basically the manual programming of the
11:47three-dimensional tooth movement that
11:50is bent into the wire .
11:51That is just insane . So , an
11:53orthodontist is not just a medical
11:55professional , but also a kind of
11:57sculptor or programmer , writing a
12:00complex 3D instruction into a tiny
12:02piece of wire .
12:03That analogy hits the nail on the head .
12:05Every archwire is essentially an
12:07individual software update for the
12:09teeth .
12:10You could look at it that way . The
12:12first-order bend controls the tooth's
12:14position inward or outward , toward the
12:17cheek or the tongue . The second-order
12:20bend controls the tilting forward or
12:22backward .
12:23Okay .
12:24And the supreme discipline is the
12:26third-order bend , the so-called torque .
12:29That is a twisting of the wire along
12:31its longitudinal axis , and it controls
12:33the inclination of the tooth root .
12:35The root . Why is that so important ?
12:38It is extremely important so that in
12:40the end , not only is the crown aligned
12:43straight , but the entire tooth is
12:45anchored stably in the bone at the
12:47correct angle with its root . And all
12:49that is bent into the wire ? That
12:52requires incredible manual dexterity .
12:55Traditionally , yes . But here , a crucial
12:57development mentioned in the sources
12:59comes into play , which is standard
13:02today : the straight-wire technique .
13:04Ah , okay .
13:06Here , this three-dimensional
13:08programming is no longer in the wire ,
13:10but built directly into the brackets .
13:13Every single bracket is designed for
13:15its specific tooth position in the
13:17dental arch and has an individual angle
13:20in the slot and an individual thickness
13:22.
13:22That means the intelligence is in the
13:24bracket , not the wire .
13:26Exactly .
13:27The phenomenal thing about it is that
13:30the orthodontist can use an
13:32industrially pre-formed , yet
13:34essentially straight wire — the
13:36straight wire . The wire wants to return
13:39to its tension-free shape , and because
13:41the brackets are all programmed
13:43differently , the teeth are still moved
13:45into the intended ideal position in all
13:48three dimensions . That’s brilliant .
13:51However , it requires extremely precise
13:53placement of the brackets . If a bracket
13:56is placed just half a millimeter too
13:58high or too low , that error is
14:00transferred one-to-one to the final
14:02result . Precision is everything here . A
14:05high-precision , almost self-regulating
14:08system . But eventually , the time comes .
14:11The teeth are straight , the fixed
14:13braces come off . After all this
14:15high-tech engineering , are the teeth "
14:18cured , " so to speak , and will they stay
14:20like that forever , or is there a catch ?
14:23Quite the opposite ; many think that ,
14:26but now comes a phase that is
14:28absolutely crucial for long-term
14:30success : the retention phase .
14:32Retention , meaning holding . Exactly .
14:35The teeth , the elastic fibers of the
14:37gums , and the bone have , so to speak , a
14:40memory . They have a strong tendency to
14:43wander back to their old , accustomed
14:46position . This is referred to as a
14:48relapse . The goal now , as the sources
14:52say , is the long-term stabilization of
14:54the treatment success .
14:56And how do you ensure that ?
14:57With a brace again .
14:58Exactly . The tool for that is the
15:00retainer . Here , too , the sources name
15:03two main types . First , the removable
15:06retainers . These can be passive plates
15:09that look like loose braces , or what is
15:12very common today , transparent plastic
15:15trays , so-called thermoformed retainers
15:17,
15:17the aligners that people know ,
15:19something like that . Yes , these are
15:21usually only worn at night to keep the
15:24teeth in their new position .
15:26And the second option is the more
15:27comfortable one , where you don't have
15:29to think about it yourself . Right ,
15:31those are the fixed retainers . These
15:34are thin , specially shaped wires that
15:37are bonded invisibly from the inside
15:39onto the tongue side , the lingual
15:41surfaces of the front teeth .
15:43Ah , you can't see them at all . No , and
15:45they often stay in the mouth for many
15:47years or even a lifetime , passively
15:50securing the position of the teeth that
15:52are most prone to shifting . Without
15:55this security , all the painstaking work
15:57beforehand would often be undone after
15:59just a few years . Let's summarize that .
16:02After this tour through the sources , it
16:05is clear : orthodontics is so much more
16:07than just cosmetics . Much more . It is a
16:09highly specialized field with precise
16:12diagnostic systems like the old Angle
16:15classes and the very German KIG , which
16:18determine medical necessity and cost
16:20coverage . There is a huge toolbox of
16:23devices that guide behavior and growth ,
16:25right up to the complex 3D programming
16:28of the straight-wire technique .
16:30Mhm .
16:30And at the very end is this crucial
16:32retention phase , without which all the
16:34effort could be in vain .
16:36Exactly . The sources paint a picture of
16:39a discipline that combines functional
16:42health — meaning a correct bite and jaw
16:45function — with aesthetics in a very
16:47structured , evidence-based framework .
16:50The precision of the KIG system , in
16:53particular , underlines this German
16:55endeavor for standardized ,
16:57comprehensible , and medically justified
17:00treatment .
17:00So , far beyond the desire for a perfect
17:03smile . Exactly . And finally , a thought
17:06that occurred to me while reading and
17:08which you might take with you . The
17:10sources speak at length about the
17:13correction of malocclusions that arise
17:15from harmful habits in childhood . That
17:18raises an exciting question for the
17:20future . Could orthodontic interventions
17:23in the future be less about using great
17:26force to move already misaligned teeth ,
17:28and instead start much , much earlier to
17:31specifically and gently guide growth
17:33and function , perhaps even before all
17:36permanent teeth have erupted ?