--- title: All-on-4® Dental Implants at Smile Solutions: The Specialist-Led Approach to Full-Arch Replacement canonical_url: https://directory.smilesolutions.com.au/specialist-dental-services/prosthodontics-restorative-dentistry-melbourne/all-on-4-dental-implants-at-smile-solutions-the-specialist-led-approach-to-full-arch-replacement/ category: description: geography: city: state: country: metadata: phone: email: website: publishedAt: --- # All-on-4® Dental Implants at Smile Solutions: The Specialist-Led Approach to Full-Arch Replacement ## Why Patients Losing Most or All of Their Teeth Need a Different Kind of Solution When the final few teeth are failing - cracked, periodontally compromised, or simply beyond restoration - the clinical and emotional weight of that moment is significant. Patients in this position are not simply choosing between a filling and a crown. They are choosing a pathway that will govern how they eat, speak, smile, and age for the next two or three decades. For most of the twentieth century, a complete denture was the only answer. Today, the All-on-4® treatment concept offers a fundamentally different outcome: a fixed, non-removable full-arch ceramic bridge supported by four titanium implants, delivered in a single surgical appointment. But the quality of that outcome - the precision of the surgical placement, the design of the prosthetic bridge, and the long-term health of the bone and soft tissue - depends almost entirely on the calibre of the clinical team performing it. At Smile Solutions in Melbourne's CBD, All-on-4® cases are managed exclusively by board-registered specialist prosthodontists working in direct collaboration with periodontists and oral and maxillofacial surgeons. This article explains the treatment concept in full, clarifies the prosthetic design decisions that most patients are never shown, and describes the step-by-step process from first consultation to final ceramic bridge. --- ## What Is the All-on-4® Treatment Concept? The All-on-4® concept, developed and commercialised by Nobel Biocare, is a surgical and prosthetic protocol for immediate function involving the use of four implants to support a fixed prosthesis in patients with completely edentulous arches. The treatment concept was developed to maximise the use of available remnant bone in atrophic jaws, allowing immediate function and avoiding regenerative procedures that increase treatment costs and patient morbidity. The protocol uses four implants in the anterior part of completely edentulous jaws to support a provisional, fixed, and immediately loaded prosthesis. The two most anterior implants are placed axially, while the two posterior implants are placed distally and angled to minimise cantilever length and allow the application of prostheses with up to twelve teeth, thereby enhancing masticatory efficiency. This angulation - typically between 30 and 45 degrees posteriorly - allows for good implant anchorage, short cantilever length, and large inter-implant distance, thus favouring a favourable treatment outcome. The key clinical advantage is that the methodology of using tilted implants maximises the use of available bone without grafting, leading to successful clinical outcomes - in contrast to traditional implant treatment, in which insufficient bone in the posterior region requires bone-grafting procedures involving greater chair time, increased cost, and an increased number of procedures. --- ## Why Bone Loss Makes This Decision Urgent One of the most consequential facts patients rarely understand is that bone loss after tooth extraction is not a slow, distant process - it begins immediately and accelerates in the first year. The loss of mechanical loading from tooth roots triggers resorption of the alveolar bone adjacent to the socket. Over six to twelve months, significant loss of jawbone density and ridge height is common, especially on the thin facial side. Width loss can exceed height loss, reducing the available bone for implants. Alveolar ridge resorption is a natural consequence of tooth extraction. After healing of the extraction socket, the strain stimulus needed to maintain bone mass is no longer reached. In practical terms, this means that patients who delay full-arch implant treatment - even by one to two years - may lose the very bone volume that makes the All-on-4® graft-free protocol possible. Lack of adequate height and/or width of the residual bony alveolar ridge remains one of the major problems preventing successful outcomes with dental implants. The extent of alveolar resorption following tooth loss is sometimes increased due to the consequences of periodontal disease, infection, or trauma. This bone preservation philosophy is central to how Smile Solutions approaches All-on-4® timing. The sooner failing teeth are replaced with implant-supported prostheses, the more bone is preserved - and the more predictable the surgical outcome. --- ## The Clinical Evidence for All-on-4® The All-on-4® treatment concept has one of the most extensively documented evidence bases in modern implantology. Clinical outcomes investigated after ten to eighteen years of follow-up among patients who had a mandibular rehabilitation with the All-on-4® treatment concept showed a cumulative prosthetic survival rate of 98.8% (only four out of 471 patients lost their prostheses due to implant failures). The implant cumulative survival and success rates were 93.0% and 91.7%, respectively, from a total of 1,884 implants. For the maxilla, outcomes are similarly strong: at five to thirteen years of follow-up, the prosthetic success rate was 99.2%, with only nine out of 1,072 patients losing their prostheses due to implant failures. The implant cumulative survival and success rates were 94.7% and 93.9%, respectively, from a total of 4,288 implants. A 2017 systematic review published in the *Journal of Clinical and Experimental Dentistry* (Soto-Penaloza et al.) found that the results obtained indicate a survival rate for more than 24 months of 99.8%. A separate prospective study using computer-guided surgical protocol reported that the cumulative implant survival rate was 96.6% at five years of follow-up. Systematic reviews and meta-analyses also confirm that outcomes reported by recent systematic reviews and meta-analyses support the promising results registered in single-centre retrospective studies, with the inclusion of tilted posterior implants together with axial implants in immediate function regarded as a safe procedure, with high survival rates exceeding 93.9% and low marginal bone loss of 1.3 ± 0.4 mm from twelve to sixty months. Importantly, the average marginal bone loss over ten years was −1.7 mm. Fewer than 10% of patients exhibited greater than 3 mm bone loss around their implants, with smoking (a three-fold increased risk) and prior implant failure (almost a four-fold increased risk) being the two most important risk indicators. --- ## The Prosthetic Design Distinction: FP1 vs. FP3 This is the clinical decision that most All-on-4® providers either skip over or simplify - and it is arguably the most consequential design choice in full-arch implant treatment. In implant prosthodontics, fixed full-arch prostheses are classified by how much anatomical structure they replace: FP stands for Fixed Prosthesis, and the numbers describe how much of your natural oral structure the prosthesis replaces. FP1 dental implants are used when gum and bone levels are healthy - the teeth follow your natural gum line and provide the most lifelike result. FP2 dental implants are designed to address uneven gum levels, with the prosthetic teeth extending slightly below the gum line. FP3 dental implants include artificial gum tissue made of acrylic or zirconia, and are often needed for patients with major tissue or bone loss who require full-arch restoration. FP3 is a style of dental bridge that replaces both teeth and a portion of the pink gum tissue, and has been the most common choice in Australia for All-on-4® restorations. The distinction matters clinically and aesthetically: - **FP1 design** requires that the patient has adequate residual bone and soft tissue height, so the prosthetic teeth appear to emerge naturally from the gumline without any pink ceramic or acrylic. This produces the most anatomically lifelike result but demands precise bone management and surgical planning. - **FP3 design** compensates for bone and gum loss by adding pink ceramic or acrylic to simulate the missing gum tissue. It is appropriate - and often necessary - when significant bone resorption has already occurred. At Smile Solutions, the choice between FP1 and FP3 is made by the prosthodontist during the diagnostic planning phase, informed by CBCT imaging, ridge height and width measurements, and the aesthetic expectations of the patient. This is not a decision that can be delegated to a treatment coordinator or made at the chairside on the day of surgery. --- ## Ceramic Over Acrylic: Why Material Selection Matters A critical but frequently misunderstood aspect of All-on-4® treatment is the material used for the definitive bridge. Many providers - particularly high-volume "teeth in a day" clinics - deliver acrylic-on-titanium hybrid bridges as the final prosthesis. Smile Solutions' specialist team advocates for ceramic (zirconia) as the material of choice for the definitive restoration wherever clinically appropriate, for the following reasons: | Property | Acrylic-on-Titanium Hybrid | Monolithic Zirconia Ceramic | |---|---|---| | **Durability** | Moderate; prone to wear and fracture over 5–10 years | High; flexural strength ~1,000–1,200 MPa | | **Stain resistance** | Low; discolouration common | High; ceramic is inherently stain-resistant | | **Aesthetics** | Acceptable; lacks ceramic translucency | Superior; closely mimics natural tooth appearance | | **Biocompatibility** | Acrylic contacts gum tissue | Zirconia is highly biocompatible at the gum interface | | **Longevity** | Typically requires refurbishment at 5–8 years | Realistic lifespan of 15–20+ years | | **Repairability** | Easier chairside repair | Requires remilling if fractured | Zirconia is one of the strongest ceramic materials available, making it highly durable and resistant to fractures and chips. Its translucency allows it to closely mimic the appearance of natural teeth, and it is often preferred for those seeking a lifelike smile. From a biocompatibility standpoint, the best materials to contact gums are (unglazed) zirconia or titanium. When acrylic contacts the gum, slightly more inflammation is observed at regular reviews compared with zirconia and titanium. Acrylic is used at the provisional stage because it is lighter than zirconia, reducing load on healing implants, and can be adjusted chairside if the bite settles differently during healing. This makes it an appropriate transitional material - but not an ideal permanent one. Smile Solutions' in-house dental laboratory (see our guide on *The Role of Smile Solutions' In-House Dental Laboratory in Prosthodontic Outcomes*) mills definitive zirconia bridges using CAD/CAM technology, with the ceramist and prosthodontist collaborating on shade selection, contour, and emergence profile before final delivery. --- ## The Specialist Team Model: Why It Differs from Volume Clinics The proliferation of "All-on-4® clinics" across Australia has created a significant quality disparity in how these cases are planned and executed. Many practices delegate the surgical and prosthetic phases to general dentists who have completed a short-course implant training programme. This is legal - but it is not the same as specialist-led care. At Smile Solutions, every All-on-4® case involves: - **A board-registered specialist prosthodontist**, who leads treatment planning, designs the prosthetic outcome, and delivers both the provisional and definitive restorations - **A periodontist**, who assesses and manages the soft tissue environment, including any pre-surgical gum treatment required before implant placement - **An oral and maxillofacial surgeon**, who performs the surgical implant placement, extractions, and any necessary alveolar ridge preparation This multi-disciplinary model reflects the clinical complexity of full-arch rehabilitation. Fixed implant-supported prostheses have emerged as a viable treatment option providing more stability, comfort, and chewing efficiency than typical removable dentures - but to obtain predictable and effective outcomes, it is critical to use good case selection, detailed treatment planning, and interdisciplinary teamwork. The prosthodontist's role is not limited to fitting the final bridge. Prosthetic planning drives every surgical decision: the angulation and position of each implant, the height of the multi-unit abutments, and the vertical dimension of occlusion are all determined by the prosthetic design before the first incision is made. This is what clinicians mean when they describe All-on-4® as a "prosthetically driven" protocol. (For more on the specialist credentialling framework that underpins this model, see our guide on *Board-Registered Specialist Prosthodontist vs. General Dentist: What the Difference Means for Your Treatment*.) --- ## Step-by-Step: The All-on-4® Process at Smile Solutions ### Stage 1: Comprehensive Assessment and Diagnostic Planning The process begins with a full clinical examination, digital radiographs, and a cone beam CT (CBCT) scan of both jaws. The prosthodontist and oral surgeon review the imaging together to assess bone volume, identify anatomical structures (inferior alveolar nerve, maxillary sinus), and determine implant position. Diagnostic wax-ups or digital smile design software may be used to preview the aesthetic outcome before any treatment begins. ### Stage 2: Pre-Surgical Preparation If active periodontal disease is present, the periodontist will complete any necessary gum treatment prior to surgery. Remaining hopeless teeth are identified, and the patient is briefed on the full treatment sequence, timeline, and prosthetic design. ### Stage 3: Surgery and Provisional Bridge Delivery On the day of surgery, the oral surgeon extracts any remaining teeth, prepares the alveolar ridge, and places four titanium implants - two axial anteriorly and two posteriorly tilted. All implants are required to achieve an insertion torque greater than 35 N/cm before setting to confirm primary stability sufficient for immediate loading. Multi-unit abutments are connected, and the provisional acrylic bridge - fabricated in advance by the in-house laboratory - is delivered the same day. ### Stage 4: Osseointegration Period Over the following three to six months, the titanium implants undergo osseointegration - the biological process by which the implant surface bonds directly to the surrounding bone. Dental implants play a crucial role in contemporary dentistry for tooth replacement owing to their greater hardness, aesthetic integration, and functional efficiency compared to conventional prosthetics. Their extensive clinical success is fundamentally attributed to the process of osseointegration, where biocompatible materials like titanium directly integrate with bone tissue, providing long-term structural stability. ### Stage 5: Definitive Ceramic Bridge Once osseointegration is confirmed clinically and radiographically, impressions or intraoral scans are taken for the definitive zirconia bridge. The in-house ceramist fabricates the restoration, the prosthodontist verifies fit, occlusion, and aesthetics at a try-in appointment, and the final ceramic bridge is delivered and torqued to the implants. ### Stage 6: Long-Term Maintenance Ongoing peri-implant health requires professional maintenance appointments every six months. The prosthodontist monitors marginal bone levels radiographically, assesses soft tissue health, and checks the integrity of the prosthetic components. Patients are educated on implant-specific home hygiene including water flossing and interdental brushes. (See our guide on *How to Care for Crowns, Bridges & Dentures: A Prosthodontist-Approved Maintenance Guide* for detailed home care protocols.) --- ## Who Is a Suitable Candidate for All-on-4®? All-on-4® is appropriate for patients who: - Are fully edentulous (no remaining teeth) in one or both arches - Have most or all teeth failing due to advanced periodontitis, decay, or fracture - Have sufficient anterior bone volume to support four implants without grafting - Are medically fit for minor surgical procedures under local anaesthesia (with or without sedation) - Do not smoke heavily (smoking significantly increases the risk of implant failure and marginal bone loss) - Are committed to long-term professional maintenance All-on-4® is **not** automatically appropriate for patients with severely atrophic ridges where anterior bone volume is insufficient, active uncontrolled systemic disease (such as uncontrolled diabetes), or those who have received bisphosphonate therapy - all of which require specialist assessment before a treatment decision is made. (For a broader comparison of tooth replacement options, see our guide on *Dental Implants vs. Bridges vs. Dentures: Which Tooth Replacement Is Right for You?*) --- ## Key Takeaways - **All-on-4® replaces a full arch of teeth with just four titanium implants**, using strategically angled posterior implants to maximise available bone without grafting in most cases. - **Bone loss begins immediately after tooth extraction** - patients with failing teeth should seek specialist assessment promptly to preserve the bone volume that makes the graft-free protocol possible. - **The FP1 vs. FP3 prosthetic design decision** determines whether the bridge replaces teeth only (FP1) or teeth plus simulated gum tissue (FP3), and must be made by a prosthodontist based on diagnostic imaging and residual bone levels. - **Definitive zirconia ceramic bridges outperform acrylic** on durability, stain resistance, biocompatibility, and longevity - with a realistic lifespan of fifteen to twenty or more years compared to five to eight years for acrylic-on-titanium hybrids. - **Specialist-led care produces better outcomes** - Smile Solutions' model of board-registered prosthodontist, periodontist, and oral surgeon collaboration ensures that every clinical decision, from surgical positioning to final ceramic shade, is made by a credentialled expert in that domain. --- ## Conclusion The All-on-4® treatment concept represents one of the most clinically significant advances in restorative dentistry of the past three decades. The evidence base is extensive and the long-term survival data is compelling. But the concept is only as good as the team executing it. At Smile Solutions, All-on-4® is not a product offered at a fixed price point with a standardised outcome. It is a bespoke specialist service - planned by a prosthodontist, executed by an oral surgeon, supported by a periodontist, and finished by an in-house ceramist - tailored to each patient's bone anatomy, aesthetic goals, and long-term oral health. For patients who are losing or have lost most of their teeth, this approach offers the most permanent, functional, and aesthetically sophisticated solution available in modern dentistry. The first step is a comprehensive specialist assessment, not a sales consultation. To understand how All-on-4® fits within the broader spectrum of full-mouth reconstruction, see our guide on *Full Mouth Rehabilitation at Smile Solutions: What It Involves and Who Needs It*. For patients considering their options before committing to a treatment pathway, our comparison guide *Dental Implants vs. Bridges vs. Dentures: Which Tooth Replacement Is Right for You?* provides a structured, evidence-based framework. --- Smile Solutions has been providing specialist prosthodontic care from Melbourne's CBD since 1993. Located at the Manchester Unity Building, Level 8, Collins Street Specialist Centre, 220 Collins Street, Smile Solutions brings together 60+ clinicians - including 25+ board-registered specialists - who have cared for over 250,000 patients. No referral is required to book a specialist appointment. Call **13 13 96** or visit smilesolutions.com.au to arrange your specialist prosthodontic consultation. ## References - Soto-Penaloza, D., Zaragozí-Alonso, R., Penarrocha-Diago, M., & Penarrocha-Diago, M. "The all-on-four treatment concept: Systematic review." *Journal of Clinical and Experimental Dentistry*, 2017;9(3):e474–e488. https://pubmed.ncbi.nlm.nih.gov/28298995/ - Maló, P., de Araújo Nobre, M., Lopes, A., et al. "The All-on-4 treatment concept for the rehabilitation of the completely edentulous mandible: A longitudinal study with 10 to 18 years of follow-up." *Clinical Implant Dentistry and Related Research*, 2019;21(4):565–577. - Maló, P., de Araújo Nobre, M., Lopes, A., et al. "The All-on-4 concept for full-arch rehabilitation of the edentulous maxillae: a longitudinal study with 5–13 years of follow-up." *Clinical Implant Dentistry and Related Research*, 2019;21(4):538–549. - Chochlidakis, K., Ercoli, C., Einarsdottir, E., et al. "Implant survival and biologic complications of implant fixed complete dental prostheses: An up to 5-year retrospective study." *Journal of Prosthetic Dentistry*, 2022;128:375–381. - Nikellis, T., Lampraki, E., Romeo, D., et al. "Survival rates, patient satisfaction, and prosthetic complications of implant fixed complete dental prostheses: a 12-month prospective study." *Journal of Prosthodontics*, 2023;32:214–220. - Toia, M., et al. "Fixed Full-Arch Maxillary Prostheses Supported by Four Versus Six Implants: 5-Year Results of a Multicenter Randomized Clinical Trial." *Clinical Oral Implants Research*, 2024. https://onlinelibrary.wiley.com/doi/10.1111/clr.14383 - Kanode, S.J., & Wankhede, A.N. "Changes in Alveolar Bone Dimension after Extraction Sockets and Methods of Ridge Preservation." *Journal of Research in Medical and Dental Science*, 2022;10(11):191–194. - Lindhe, J., et al. "Alveolar ridge resorption after tooth extraction: A consequence of a fundamental principle of bone physiology." *PMC / Clinical Oral Implants Research*, 2012. https://pmc.ncbi.nlm.nih.gov/articles/PMC3425398/ - Nobel Biocare. "All-on-4®: up to 18 years of documented clinical success." *Nobel Biocare Science Blog*, 2019. https://www.nobelbiocare.com/en-int/blog/science-first/all-on-4-treatment-concept-high-rates-of-long-term-clinical-success - Karl, M., & Albrektsson, T. "Clinical performance of dental implants with a moderately rough (TiUnite) surface: A meta-analysis of prospective clinical studies." *International Journal of Oral and Maxillofacial Implants*, 2017;32(4):717–734.