--- title: Crown Lengthening and Gum Lifts at Smile Solutions: Periodontal Surgery for Restorative and Aesthetic Outcomes canonical_url: https://directory.smilesolutions.com.au/dental-health-specialist-care/periodontics-gum-disease-treatment/crown-lengthening-and-gum-lifts-at-smile-solutions-periodontal-surgery-for-restorative-and-aesthetic-outcomes/ category: description: geography: city: state: country: metadata: phone: email: website: publishedAt: --- # Crown Lengthening and Gum Lifts at Smile Solutions: Periodontal Surgery for Restorative and Aesthetic Outcomes ## Crown Lengthening and Gum Lifts at Smile Solutions: Periodontal Surgery for Restorative and Aesthetic Outcomes When a tooth is too broken down, too decayed, or too buried beneath the gumline to be properly restored - or when an excess of gum tissue makes a smile appear disproportionately "gummy" - crown lengthening surgery offers a precise, evidence-based solution. It is one of the most clinically versatile procedures in a specialist periodontist's repertoire, serving both the functional demands of restorative dentistry and the aesthetic goals of smile design. Yet it is also one of the most technically demanding, requiring an accurate diagnosis, careful surgical planning, and - at its best - close collaboration between a specialist periodontist and a prosthodontist before a single incision is made. At Smile Solutions in Melbourne's CBD, this collaboration is built into the practice model. Board-registered specialist periodontists and prosthodontists work under the same roof, planning crown lengthening outcomes together so that the surgical result directly serves the restorative or aesthetic objective. This article explains exactly what crown lengthening is, why it is performed, how it is done, what patients can expect during recovery, and why specialist-level care is essential for predictable outcomes. --- ## What Is Crown Lengthening? A Clinical Definition The American Academy of Periodontology's Glossary of Periodontal Terms defines clinical crown lengthening as a surgical procedure that aims at exposing sound tooth structure for restorative purposes via apical repositioning of the gingival tissue, with or without removal of alveolar bone. In practical terms, the procedure exposes more of the tooth by surgically moving the gumline and, where necessary, the underlying bone to a lower position. Crown lengthening is one of the most common surgical procedures in periodontal practice, with indications including subgingival caries, crown or root fractures, altered passive eruption, cervical root resorption, and short clinical abutment, with the aim of re-establishing the biologic width in a more apical position. Crown lengthening is done for functional and/or esthetic reasons. Functionally, it is used to increase retention and resistance when placing a fabricated dental crown, provide access to subgingival caries, access accidental tooth perforations, and access external root resorption. Esthetically, crown lengthening is used to alter gum and tooth proportions, such as in a gummy smile. --- ## The Two Clinical Indications: Restorative vs. Aesthetic ### Restorative Crown Lengthening: Protecting the Biological Width The most medically critical indication for crown lengthening is restorative - specifically, the need to establish adequate tooth structure above the bone level before placing a crown, filling, or other restoration. At the heart of this indication is a concept called the **supracrestal tissue attachment** (formerly known as the biological width). Previously known as biologic width, supracrestal tissue attachment (STA) consists of the junctional epithelium and connective tissue attachment above the alveolar crest. On average, STA is 2.04 mm, with the junctional epithelium and connective tissue constituting 0.97 and 1.07 mm respectively. However, the STA has been observed to vary between 0.75–4.33 mm. This zone of biological attachment must not be invaded by a dental restoration. It is important to avoid invading the STA when fabricating dental restorations. If a dental restoration invades the STA, chronic inflammation is likely to occur, which then causes pain, gum recession, and unpredictable loss of alveolar bone. When the biologic width is violated, the body attempts to reestablish it through osseous resorption. This pathological process is believed to often result in chronic inflammation, bone loss, and periodontitis. To prevent this outcome, the periodontist must surgically create sufficient clearance between the planned restorative margin and the alveolar bone crest. Achieving 1.5–2 mm of ferrule and 3 mm of supra-alveolar tooth structure is essential for long-term restorative success; other studies suggest this facilitates biologic width formation and ensures prosthesis stability. The ferrule itself plays a critical biomechanical role. In dentistry, the ferrule effect is "a 360° collar of the crown surrounding the parallel walls of the dentin extending coronal to the shoulder of the preparation." This circumferential collar should have a height of approximately 2 mm and width of approximately 1 mm. The presence of adequate ferrule helps resist tooth fracture by minimising stress concentration at the junction of tooth structure and the dental restoration. This has been shown to significantly reduce the incidence of fracture in the endodontically treated tooth. **Common restorative indications for crown lengthening include:** - Deep subgingival caries that cannot be accessed or restored without first exposing more tooth structure - A tooth fracture at or below the gumline - An existing restoration whose margin encroaches on the biological width, causing chronic inflammation - An endodontically treated tooth with insufficient coronal structure to achieve an adequate ferrule for crown placement - Root perforation in the coronal third requiring surgical access ### Aesthetic Crown Lengthening: Correcting the "Gummy Smile" The second major indication is aesthetic. A normal smile has 1–2 mm of gingival display from the inferior border of the upper lip to the gingival margin of the upper central incisors. Greater than 4 mm of gingival display is aesthetically not pleasing for most patients and is known as excessive gingival display (EGD), leading to a gummy smile. The prevalence of EGD ranges from 10.5% to 29% worldwide, and it is more common in women than men. The most frequent cause of a gummy smile amenable to surgical correction is **altered passive eruption (APE)**. Failure in passive eruption - by the apical movement of gingiva from the enamel surface - generally results in a clinical condition known as altered passive eruption. It can result in the shortened crown height of a tooth and an esthetically unpleasant situation, i.e., excessive gingival display or gummy smile. The prevalence of APE is reported to be approximately 12% considering more than 1,000 adult patients with a mean age of 24 years. This condition may create esthetic concerns due to the display of excessive quantity of gingival tissue at upper anterior teeth when smiling. The psychosocial impact of a gummy smile is well-documented in peer-reviewed literature. A 2013 study published in the *Journal of Periodontology* by Malkinson, Waldrop, Gunsolley, Lanning, and Sabatini found that excessive gingival display did negatively affect how attractive a person's smile is judged to be. In addition, how friendly, trustworthy, intelligent, and self-confident a person was perceived to be was inversely related to the amount of gingival display. Untrained laypeople were just as sensitive to these differences as senior dental students. Importantly, not all gummy smiles have the same cause. The condition is multifactorial in origin, with causes ranging from altered passive eruption and vertical maxillary excess to hyperactive lip musculature. Proper diagnosis is critical to determine the most appropriate treatment modality. Aesthetic crown lengthening is specifically indicated for gummy smiles caused by APE - where the anatomical crown is fully formed but obscured by excess gingival tissue and/or a bone crest positioned too far coronally. Cases driven by vertical maxillary excess may require orthognathic surgery, while those caused by a hyperactive lip may be better addressed by lip repositioning surgery, sometimes in combination with crown lengthening. --- ## Presurgical Assessment: What Happens Before the Procedure At Smile Solutions, no crown lengthening procedure is undertaken without a thorough diagnostic workup. This is where the collaboration between the specialist periodontist and prosthodontist begins - and where the quality of the outcome is largely determined. **Key presurgical assessments include:** - **Periodontal charting and pocket depth measurement** to confirm the periodontium is healthy and free of active disease before any elective surgery is considered (see our guide on *Your First Periodontist Appointment at Smile Solutions*) - **Periapical radiographs** to assess the position of the alveolar bone crest relative to the cementoenamel junction (CEJ) and the extent of any caries or fracture - **Bone sounding** (transgingival probing under local anaesthetic) to precisely locate the bone crest and plan the extent of osseous reduction - **Crown-to-root ratio assessment** to ensure that removing bone will not compromise the long-term support of the tooth - **Smile analysis and Digital Smile Design (DSD)** for aesthetic cases, allowing the anticipated gingival margin to be simulated before surgery Using cone-beam computed tomography to determine the cementoenamel junction for smile design and treatment planning brings many benefits. Patients and clinicians can foresee treatment results, and from there, appropriate changes can be made. Predictable results in the treatment of excessive gingival display are obtained through periodontal plastic surgery and osseous surgery. Careful preoperative planning improves surgical outcomes, increases gingival margin stability after surgery, and satisfies patient aesthetic expectations. For restorative cases, the prosthodontist at Smile Solutions communicates the planned crown margin position to the periodontist before surgery, so the surgical endpoint is defined by the restorative requirement - not the other way around. In a multidisciplinary model, where the restoring dentist refers the patient to a surgeon, the restoring dentist should evaluate all factors that might affect the dentition's prognosis. Such consideration can help the referring dentist and surgeon develop a treatment plan and establish the sequence of the procedure. Generally, the restorative dentist can collaborate with the surgeon to determine the amount of tooth structure to be exposed during the surgery. --- ## The Surgical Technique: Step by Step The surgical technique - either via gingivectomy or apically repositioning the flaps - will depend on two critical factors: the underlying crestal bone and the width of the attached gingiva. There are three primary surgical approaches, selected based on the clinical findings: ### 1. Gingivectomy (Soft Tissue Only) Used when there is an adequate band of keratinized gingiva and the bone crest is already at an appropriate level (typically ≥3 mm below the planned restorative margin). The excess gum tissue is excised and repositioned. This is the simplest approach and is suitable for some aesthetic cases where the bone does not need to be moved. If only a gingivectomy is performed rather than bone removal in subcategory B clinical scenarios (where the osseous crest is at the CEJ), soft tissue rebound is likely in the future. This is why correct diagnosis is essential - performing a gingivectomy alone when bone recontouring is required will result in gum tissue growing back. ### 2. Apically Positioned Flap with Osseous Resection This is the most commonly required technique for both restorative and aesthetic crown lengthening where the bone must be repositioned. The steps are as follows: 1. **Local anaesthetic** is administered to ensure the patient is fully comfortable throughout the procedure 2. **Sulcular and releasing incisions** are made to create a full-thickness mucoperiosteal flap 3. **The flap is reflected** to expose the underlying alveolar bone 4. **Osseous recontouring** (osteotomy and osteoplasty) is performed using rotary instruments or piezoelectric devices to reposition the bone crest apically, creating the required 3 mm of clearance between bone and the planned restorative margin 5. **The flap is repositioned apically** and sutured at or just coronal to the CEJ 6. **A periodontal dressing** may be applied to protect the surgical site during initial healing Ostectomy with apically positioned flap can be considered a more effective procedure than gingivectomy for surgical crown lengthening. Osteoblastic activity reaches its peak between the third and fourth week after osseous resective surgery. Soft tissue repair - including reestablishing the attached epithelium and connective tissue - begins one week postoperatively and reaches functional maturity between 6 to 9 months post-treatment. ### 3. Laser-Assisted Crown Lengthening For select cases - particularly where only soft tissue removal is required - erbium lasers offer a minimally invasive alternative. Erbium lasers may be useful in localised osseous tissue removal for establishing a new biologic width without raising a gingival flap. In allowing for careful removal of osseous tissue in a closed-flap technique, along with soft tissue removal, the clinician can create the biologic width for the final restoration and complete the impressions for the indirect restoration in the same appointment. (See our guide on *Laser Periodontal Treatment at Smile Solutions* for a full discussion of laser applications in periodontics.) --- ## Healing Timeline: When Can Restorative Work Begin? One of the most clinically important - and frequently misunderstood - aspects of crown lengthening is the healing timeline. Proceeding with final restorations too early risks placing margins that will end up subgingival as the gum tissue settles, compromising both the biological and aesthetic result. It is commonly accepted that 6 to 12 weeks of healing after crown lengthening are sufficient before the restoring dentist can place the final restorative margins and take the final impression for functional or posterior restorations. For esthetic or anterior cases, 3 months is the minimal healing time for impressions and final restoration. The final position of the free gingival margin can occur at three months after surgery but may occur as long as six months after surgery. For treated areas in the esthetic zone, a waiting period of six months is advisable. Factors that affect the postoperative reconstitution of the biological width include gingival biotype, immediate post-suturing position of the flap, inter-individual variation of the biologic width, amount of osseous resection, post-surgical bone remodelling, and clinical experience of the operator. Gingival biotype is particularly relevant: patients with thick tissue biotype demonstrated significantly more coronal soft tissue regrowth than patients with thin biotype due to the natural biological differences in inter-individual patterns of healing responses. A 2024 study published in *Clinical Oral Investigations* (Springer Nature) confirmed that the esthetic crown lengthening procedure has led to stability of the gingival margin at 3, 6, and 12 months post-surgically in individuals with shortened clinical crown length due to altered passive eruption. --- ## Aesthetic Outcomes: The Evidence for Gummy Smile Correction For patients undergoing aesthetic crown lengthening for altered passive eruption, the clinical outcomes are highly predictable when performed correctly. A case series study from the Department of Periodontology and Implant Dentistry at the University of Florence–Siena (Cairo et al., *PubMed* 2012), which included eleven patients with a total of 58 teeth treated with flap surgery and osseous resective therapy at upper anterior natural teeth, found that at the last follow-up, a significant and stable improvement of crown length was obtained compared to baseline (P < 0.0001). All patients rated as satisfactory in the final outcomes (final VAS value = 86.6). The study concluded that periodontal plastic surgery including osseous resection leads to predictable outcomes in the treatment of altered passive eruption/gummy smile, and that careful preoperative planning avoids unpleasant complications and enhances postsurgical stability of the gingival margin. A 2019 study by Aroni, Pigossi, Pichotano, de Oliveira, and Marcantonio, published in the *International Journal of Esthetic Dentistry*, evaluated six female patients aged 18–22 with APE type 1B. Compared with baseline, an increase of 1.6 mm in mean tooth crown height was observed in photographic analysis at 12 months. A minimal difference was observed between mean tooth crown height immediately post-operatively and at 12 months, indicating stability of the gingival margin. The surgical protocol resulted in predictable outcomes and stability of the gingival margin one year after surgery. Aesthetics plays an important role in the patient's self-esteem, so a gummy smile could have a negative effect on their social and personal life. Surgically correcting excessive gingival exposure through esthetic recontouring can help patients improve the appearance of their smile and regain self-confidence. --- ## The Interdisciplinary Advantage at Smile Solutions Crown lengthening sits at the intersection of periodontics and restorative dentistry. When performed in isolation - without a clear restorative plan - the risk of a suboptimal outcome increases substantially. At Smile Solutions, the co-location of board-registered specialist periodontists and prosthodontists means that treatment planning is genuinely collaborative. The combination of periodontal surgery and advanced restorative techniques successfully addresses patients' esthetic concerns, achieving a balanced gingival-dental relationship and a natural, harmonious smile. This demonstrates the value of an interdisciplinary approach in managing complex esthetic challenges, providing predictable and satisfying outcomes for both clinicians and patients. For complex aesthetic cases, digital smile design tools allow the prosthodontist to define the ideal gingival zenith positions, tooth proportions, and crown lengths before surgery. The findings of recent studies indicate that marginal soft-tissue stability following crown lengthening is primarily determined by the accuracy with which the bone crest is positioned relative to the planned restorative outcome. The digitally guided approach allows the transfer of the prosthetic design directly to the surgical field, providing a reproducible reference for determining the target bone level. This integration also matters for patients who require crown lengthening as part of a broader smile rehabilitation - for example, those who need crown lengthening to expose sufficient tooth structure before veneers or ceramic crowns can be placed. (See our guide on *Periodontics & Gum Disease Treatment at Smile Solutions Melbourne: The Complete Guide to Specialist Periodontist Care* for an overview of how these treatments fit into a comprehensive care plan.) --- ## Risks, Limitations, and Contraindications Crown lengthening is a safe and well-established procedure, but it is not without considerations that must be discussed with every patient. - The alveolar bone surrounding a tooth also surrounds adjacent teeth. Removing bone for a crown lengthening procedure will effectively decrease the bony support available for surrounding teeth and unfavourably increase the crown-to-root ratio. Additionally, once alveolar bone is removed, it is almost impossible to restore it to previous levels. - Crown lengthening can result in loss of the interdental papilla, which results in poor soft tissue aesthetics known as "black triangles." Some patients develop significant sensitivity because of the exposed dentine. - There might not be enough alveolar bone to support an implant in an area where a crown lengthening procedure has been completed. Thus, it would be prudent for patients to thoroughly discuss all of their treatment options with their dentist before undergoing an irreversible procedure such as crown lengthening. - If a gummy smile is caused by vertical maxillary excess rather than altered passive eruption, crown lengthening alone will not resolve the underlying skeletal issue and a surgical referral may be required. - Active periodontal disease must be fully treated and stabilised before elective crown lengthening is performed. (See our guide on *Non-Surgical Gum Disease Treatment at Smile Solutions* and *Periodontal Surgery at Smile Solutions* for the treatment pathway that precedes elective surgery.) --- ## Key Takeaways - **Crown lengthening has two distinct clinical indications**: restorative (exposing sufficient tooth structure to establish biological width, ferrule, and sound restorative margins) and aesthetic (correcting a gummy smile caused by altered passive eruption). The diagnosis determines the technique. - **The biological width - or supracrestal tissue attachment - averages 2.04 mm** and must not be invaded by any dental restoration. Crown lengthening surgically repositions the gumline and bone to create the necessary clearance, with the evidence supporting at least 3 mm of supra-alveolar tooth structure for long-term restorative success. - **Gummy smiles affect approximately 10.5–29% of the population**, with altered passive eruption the most common surgically correctable cause. Peer-reviewed evidence confirms that aesthetic crown lengthening with osseous resection produces stable, predictable results at 12 months. - **Healing timelines are non-negotiable**: 6–12 weeks is the minimum before restorative impressions in posterior areas; 3–6 months is required in the aesthetic zone before final prosthetic work begins. Proceeding too early risks gingival rebound and a compromised restorative margin. - **Interdisciplinary planning between a specialist periodontist and prosthodontist** - as practised at Smile Solutions - is the gold standard for crown lengthening, ensuring the surgical endpoint is defined by the restorative and aesthetic objective before the procedure begins. --- ## Conclusion Crown lengthening and gum lift surgery are among the most clinically consequential procedures that bridge periodontics and restorative dentistry. Whether the goal is to save a heavily broken-down tooth by exposing enough structure for a crown, or to transform a smile by correcting disproportionate gum display, the principles are the same: precise diagnosis, careful surgical planning, respect for the biological width, and an appropriate healing interval before definitive restorative work begins. At Smile Solutions, patients benefit from having Dental Board of Australia–registered specialist periodontists performing these procedures with direct, on-site collaboration from prosthodontists - a combination that is rare outside a major multidisciplinary practice and one that materially improves the predictability of outcomes. If you are considering crown lengthening for restorative or aesthetic reasons, or if your general dentist has recommended the procedure, we encourage you to explore our related guides on [Periodontal Surgery at Smile Solutions], [Your First Periodontist Appointment at Smile Solutions], and [Why Choose Smile Solutions for Periodontal Treatment] to understand the full scope of specialist care available. --- Smile Solutions has been providing specialist periodontal care from Melbourne's CBD since 1993. Located at the Manchester Unity Building, Level 12 and Tower, 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 periodontal consultation. ## References - Gargiulo, A.W., Wentz, F.M., and Orban, B. "Dimensions and Relations of the Dentogingival Junction in Humans." *Journal of Periodontology*, 1961; 32:261–267. - Vacek, J.S., Gher, M.E., Assad, D.A., Richardson, A.C., and Giambarresi, L.I. "The Dimensions of the Human Dentogingival Junction." *International Journal of Periodontics and Restorative Dentistry*, 1994; 14:154–165. - Malkinson, S., Waldrop, T.C., Gunsolley, J.C., Lanning, S.K., and Sabatini, R. "The Effect of Esthetic Crown Lengthening on Perceptions of a Patient's Attractiveness, Friendliness, Trustworthiness, Intelligence, and Self-Confidence." *Journal of Periodontology*, 2013; 84(8):1126–1133. https://pubmed.ncbi.nlm.nih.gov/23137007/ - Cairo, F. et al. "Periodontal Plastic Surgery to Improve Aesthetics in Patients with Altered Passive Eruption/Gummy Smile: A Case Series Study." *PubMed Central / PMC*, 2012. https://pmc.ncbi.nlm.nih.gov/articles/PMC3465986/ - Aroni, M.A.T., Pigossi, S.C., Pichotano, E.C., de Oliveira, G.J.P.L., and Marcantonio, R.A.C. "Esthetic Crown Lengthening in the Treatment of Gummy Smile." *International Journal of Esthetic Dentistry*, 2019; 14(4):370–382. https://pubmed.ncbi.nlm.nih.gov/31549103/ - Deas, D.E., Moritz, A.J., McDonnell, H.T., Powell, C.A., and Mealey, B.L. "Osseous Surgery for Crown Lengthening: A 6-Month Clinical Study." *Journal of Periodontology*, 2004; 75:1288–1294. - Goel, A., Mott, D.A., Wilkerson, C., and Ellzey, A.T. "Insights Into Healing Phases and Tissue Adaptations of Crown Lengthening." *Decisions in Dentistry*, January 2024. https://decisionsindentistry.com/2024/01/insights-into-healing-phases-and-tissue-adaptations-of-crown-lengthening/ - Qali, et al. "Clinical Considerations for Crown Lengthening: A Comprehensive Review." *Cureus*, November 2024; 16(11):e72934. https://www.researchgate.net/publication/385509224 - Nguyen Thai Cong, Pham Hoai Nam, Hoang Viet, and Anand Marya. "Digitally Planned Surgical Crown Lengthening: A Novel Bone Reduction Strategy to Correct a Gummy Smile." *Journal of Surgical Case Reports*, April 2024. https://doi.org/10.1093/jscr/rjae202 - Systematic Review: "Periodontal Tissue Changes After Crown Lengthening Surgery: A Systematic Review and Meta-Analysis." *PMC / NIH*, 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10213835/ - Lanning, S.K., Waldrop, T.C., Gunsolley, J.C., and Maynard, J.G. "Surgical Crown Lengthening: Evaluation of the Biological Width." *Journal of Periodontology*, 2003; 74:468–474. - American Academy of Periodontology. *Glossary of Periodontal Terms*, 5th Edition. Chicago: AAP, 2001.