CATEGORY AUSTRALASIAN DENTIST 49 CLINICAL Pulpal and Tooth Vitality Changes Orthodontic forces can cause transient changes in pulp blood flow and sensibility, but systematic reviews suggest that they do not usually cause loss of pulp vitality. So when does it become a problem? It is suggested that the risk is higher in teeth with previous trauma, so these teeth should be monitored more closely during treatment. Take-home points u Most pulpal changes caused by orthodontic treatment are reversible. u However, excessive forces can increase the risk of pulpal damage. u And teeth with prior trauma require careful monitoring. Temporomandibular Joint (TMJ) Issues The relationship between orthodontics and temporomandibular disorders is controversial, but the best available evidence suggests orthodontic treatment is generally TMD NEUTRAL and does not directly cause TMD. But still, treatment planning should be cautious in patients who already have pain or joint symptoms, because unstable occlusal changes may aggravate pre-existing problems. Key conclusion: u Orthodontic treatment does not appear to directly cause TMD. u However, improper occlusal changes or unstable mechanics may aggravate preexisting problems. Soft Tissue Injuries Orthodontic appliances can injure oral soft tissues as the sharp wires can poke the mucosa. Examples: u Ulceration u Lip and cheek irritation u Trauma from wires or brackets Usually, these are minor and manageable with proper appliance adjustment and wax use. Anchorage Loss and Unwanted Tooth Movement Anchorage loss is a recognized biomechanical complication in orthodontics, caused by inadequate force control or poorly planned anchorage reinforcement. Evidence from systematic reviews shows that anchorage outcomes vary widely, so careful biomechanics and individualized planning are essential to prevent unwanted tooth movement. Improper biomechanics can result in: u Uncontrolled tipping u Anchorage loss u Occlusal discrepancies u Relapse but is still possible in orthodontic movement generally. u Gingival irritation or pressure-related soreness from tray edges. u Caries or demineralization risk if trays are worn over a high-sugar or poorly controlled oral environment. u Speech difficulty, dry mouth, and mucosal irritation in some patients. u Over-opening of the bite or posterior open bite if wear or mechanics are not managed well. u Relapse if retention is not used properly. For aligners, the big clinical risks are usually less about bracket-related trauma and more about treatment planning errors, patient noncompliance, and unintended tooth movement. In other words, aligners are not risk-free; they just shift the pattern of risk toward planning, tracking, and wearrelated problems. Red flags u IPR planned before establishing proper contacts between the teeth. u Staging multiple difficult movements together. u Advancing the trays despite poor tracking. u Repeating IPR without confirming the need. u Ignoring periodontal inflammation or hygiene problems. Risk area Braces Clear aligners Soft tissue irritation Higher in conventional orthodontics, Lower, but tray edges can still irritate due to brackets and wires rubbing mucosa when it is not trimmed cheeks/lips properly. Plaque and gingival Higher, because fixed appliances Lower, because trays are removable inflammation make cleaning harder. and brushing/flossing is easier. Root resorption Higher Lower than braces in that study, but not totally absent Pain early in Often more prolonged recovery after Often subsides faster after the first treatment start-up 1–2 weeks Treatment errors / More mechanics-related risks, but Higher risk of under-correction, poor tracking issues movement is more controlled for tracking, or unintended movement complex case. if compliance is poor. Compliance-related Less dependent on patient wear More dependent on 22–23 hour failure time. daily wear. Fig 2: Soft tissue impingement by Orthodontic appliance2 Fig 3: Anchor loss during Orthodontic treatment3 Iatrogenic effects of aligners Clear aligners generally produce fewer softtissue and hygiene-related problems than fixed appliances, but they are still not free from iatrogenic risks! Common or plausible iatrogenic effects with aligners include: u Poor fit or incorrect staging, which can lead to unwanted tooth movement or inadequate correction. u Root resorption, which is usually less emphasized than with fixed appliances, Fig 4: Mis-tracking during aligner treatment 4
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