CATEGORY 42 AUSTRALASIAN DENTIST The integration of orthodontics into restorative treatment planning has become a defining feature of modern, conservative dentistry. In recent years, clear aligner therapy has emerged as the most commonly used orthodontic modality for pre-restorative cases, particularly in adults who might otherwise decline orthodontic treatment. When used appropriately, aligners can dramatically simplify restorative care, reduce tooth preparation, and improve long-term outcomes. When misused, however, they can create instability, periodontal risk, and restorative compromise. This article provides a balanced, evidence-based review of the benefits and limitations of using clear aligners as a prerestorative option, framed specifically for general dentists. Why consider orthodontics before restoration? The fundamental principle of prerestorative orthodontics is simple: moving teeth is biologically cheaper than cutting them. Orthodontics allows correction of tooth position, spacing, and occlusal relationships without irreversible loss of enamel or dentine. Restorative dentistry, by contrast, permanently alters tooth structure. Peer-reviewed literature consistently supports the interdisciplinary approach, demonstrating that orthodontic alignment prior to restoration reduces restoration size, improves enamel bonding, enhances periodontal health, and improves aesthetic longevity. Clear aligners have lowered the threshold for offering this option to adult patients. The benefits of clear aligners in prerestorative cases 1. Increased patient acceptance Adult restorative patients are often motivated by aesthetics but reluctant to undergo fixed orthodontic treatment. Clear aligners offer: u Superior aesthetics during treatment CLINICAL Using clear aligners as a pre-restorative option – the benefits and the issues Dr Geoff Hall By Dr Geoff Hall, BDsc (Melb) Cert Orth (Uni of Penn) MRACDS (Orth), Diplomate – American Board of Orthodontics (ABO) u Removability for social and professional situations u Improved comfort compared with fixed appliances This increased acceptance allows clinicians to offer orthodontics in cases that previously would have been restored directly – often with biological compromise. 2. Precise space management Clear aligners are particularly effective at controlled space redistribution, which is critical in pre-restorative planning. Common applications include: u Closing or redistributing diastemata u Creating symmetrical spaces for veneers or crowns u Repositioning contact points to eliminate black triangles Digital setups allow restorative and orthodontic objectives to be planned together, improving predictability when the software is used critically rather than blindly. 3. Alignment to preserve enamel One of the strongest arguments for pre-restorative orthodontics is enamel preservation. Studies clearly show that restorations bonded predominantly to enamel have: u Higher bond strengths u Improved marginal integrity u Superior long-term survival By aligning rotated or crowded teeth orthodontically, clear aligners reduce the need for aggressive preparation, especially for veneers. 4. Occlusal optimisation before restoration Clear aligners can be used to: u Improve anterior guidance u Reduce unfavourable edge-to-edge or crossbite relationships u Level occlusal planes prior to fullmouth rehabilitation Restorations placed into a more favourable occlusal environment are less prone to fracture, debonding, and wear. 5. Tooth uprighting and implant site development In partially edentulous patients, aligners are effective for: u Uprighting tilted molars u Reopening collapsed spaces u Improving implant site geometry The literature supports orthodontic uprighting as a predictable method of simplifying implant placement and reducing the need for surgical augmentation. The biological and mechanical limitations of aligners Despite their advantages, aligners are not biologically neutral and must be used with the same diagnostic discipline as fixed appliances. 1. Over-reliance on expansion Digital aligner setups frequently propose transverse expansion as a default solution. In adult pre-restorative cases, this is often inappropriate. Evidence shows that: u Posterior dentoalveolar expansion in adults is limited and relapse-prone u Excessive expansion risks buccal bone dehiscence and gingival recession u “Creating space” via expansion can destabilise restorative outcomes In many adult cases, interproximal reduction or extractions are biologically safer than expansion, even if they appear less attractive digitally. 2. Incisor proclination and aesthetic risk Aligner-based non-extraction treatments often rely on incisor proclination to gain space. In a restorative patient, this can: u Compromise facial aesthetics u Increase lip strain u Reduce restorative longevity due to unfavourable loading Pre-restorative orthodontics should improve aesthetics, not create new problems that restorations must later mask. 3. Limited vertical control Aligners are less predictable for:
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