Biomimetic Strategies for the Rehabilitation of Compromised Anterior Teeth

Abstract

The esthetic and biomechanical rehabilitation of teeth with significant structural compromise remains a complex yet vital component of contemporary restorative and endodontic practice. Given their prominent role in facial appearance and psychosocial confidence, the loss of structural integrity in anterior teeth presents, with significant clinical challenges. Such teeth necessitate strategic internal reinforcement to withstand functional load and achieve a long-term success. This case series describes a customized approach for utilizing evidence-based reinforcing methods to restore severely damaged anterior teeth. The use of fiber-reinforced posts and anatomic/custom posts is emphasized to maximize even stress distribution and mimic the elasticity of the natural dentin. Furthermore, crown selection and other periodontal procedures, such as gingivectomy, were performed as required. The outcomes highlight the vital role of patient-specific treatment planning, biomechanical reinforcement, and appropriate material selection in achieving esthetically harmonious and long-term outcomes in complex anterior rehabilitations.

Introduction

The rehabilitation of severely mutilated anterior teeth presents a complex challenge, owing to their esthetic prominence and role in phonetics. High esthetic standards must be met while restoring anterior teeth since even slight variations in color, translucency, or form can be easily detected and affect patient satisfaction. A successful rehabilitation is essential for general well-being since anterior tooth loss or compromised esthetics have significant psychological and social repercussions.

The clinical difficulties in restoring these teeth stem from a variety of factors, including missing teeth, proclination, discoloration, spacing, attritted or abraded dentition, and malocclusion. In addition, previous trauma, caries, or endodontic treatments can further compromise the remaining tooth structure, making conventional restorative options less predictable or even unfeasible and often require extensive removal of healthy tooth tissue to accommodate crowns or bridges, which can weaken the remaining tooth and reduce the longevity of the restoration.

Biomechanically, these teeth are subjected to complicated lateral and shearing pressures during function, necessitating restorations that can effectively distribute stress and prevent structural failure, a concern emphasized in occlusal studies.[1] Although a ferrule of ≥2 mm greatly increases fracture resistance, an in vitro investigation by Kutesa-Mutebi and Osman showed that its removal in teeth with little coronal dentin remaining may allow restorations without posts but with a significantly higher probability of failure.[2] Another challenge is soft tissue management since the esthetic “smile zone” relies on a harmonious gingival architecture, which frequently necessitates surgical intervention to provide proper tooth exposure and symmetry.[1]

Traditional restorative approaches for rehabilitation of such teeth often require extensive removal of healthy tooth tissue to accommodate crowns or bridges, which can weaken the remaining tooth and thus may not be suitable in cases of significant tooth structure damage. Therefore, such cases where conventional coronal restoration is unfeasible, the endodontically treated teeth may further demand intracoronal retentive features for establishing stability.[3] Such cases, therefore, require a highly customized treatment approach that addresses the biological, functional, and esthetic concerns, including soft-tissue management.[4]

Biomimetic restorative dentistry has evolved as a transformative approach to these challenges. Biomimetic strategies aim to preserve as much natural tooth structure as possible by employing innovative adhesive techniques and restorative materials that closely resemble the mechanical, optical, and biological qualities of natural teeth. These protocols prioritize minimally invasive procedures, stress-reduction strategies, and the use of materials that mimic the elasticity and robustness of dentin and enamel. By doing this, biomimetic restorations increase the longevity and durability of the treated teeth, minimizing the possibility of future fractures or failures, in addition to improving the functional and esthetic outcomes. Biomimetic techniques thus seek to overcome the obstacles encountered during the rehabilitation of severely mutilated teeth by emphasizing tissue preservation, functional integrity, and natural esthetics, resulting in superior clinical outcomes and patient satisfaction.[5]

In the present case series, each case presents with unique clinical challenges which required a distinct approach for rehabilitation, carefully tailored for the anatomical, structural, and esthetic need. The selected treatment modalities reflect a deliberate consideration of various factors such as soft-tissue management, canal morphology, remaining dentin structure, and restorative requirements to establish successful outcomes.

Case Reports

Case 1: Laser-assisted crown lengthening and custom fiber post rehabilitation of mutilated anterior teeth

A 19-year-old female patient reported to the Department of Conservative Dentistry and Endodontics with the chief complaint of broken upper front teeth for 1 year. The patient had undergone endodontic therapy 1 year back and did not present with relevant medical history.

Intraoral examination revealed grossly mutilated upper central and lateral incisors. No tenderness on percussion was noted. Soft tissue examination revealed an inflamed, soft, and erythematous gingiva. Bleeding on probing was present. Figure 1a illustrates the preoperative clinical image. Intraoral periapical radiograph revealed endodontically treated maxillary incisors [Figure 1b]. Due to insufficient coronal structure, gingivectomy was done using Laser (Picasso Dental Diode laser, AMD lasers, USA) to enhance the ferrule effect and improve the gingival health. After achieving adequate local anesthesia using a 27-gauge needle and 2% lidocaine with 1:100,000 epinephrine (Xylocaine, Dentsply Sirona, Charlotte, NC), transgingival probing was done around intended teeth to determine biologic width, which was 2 mm, and probing depth was 3 mm. Thus, 0.5 mm of soft tissue was excised using a soft-tissue diode laser. Care was taken to maintain the gingival zenith. Figure 1c shows the immediate postoperative crown lengthening image. A moist pack was given, and the patient was recalled after a week to evaluate gingival stability. After satisfactory healing, careful treatment planning was done, and rehabilitation with anatomic posts was proposed based on patient’s functional and esthetic requirements. The procedure was explained, and written informed consent was obtained.

Figure 1.

(a) Preoperative clinical image, (b) Preoperative radiograph showing endodontically treated maxillary incisors, (c) Immediate postoperative crown lengthening image, (d) Post space preparation using peeso reamers, (e) Fabrication and cementation of anatomic posts, (f) Postoperative radiograph after anatomic post cementation, (g) Tooth preparation completed prior to impression, (h) Impression and bite registration done, (i) Shade selection, (j) Temporization done

Isolation was done using the split rubber dam technique using the Hygienic^® Dental Dam (Coltene, Altstätten, Switzerland) and #2 clamp (Fiesta Color Coded Clamps, Coltene). Post space preparation was done using Peeso-reamers (MANI, INC. Japan) [Figure 1d]. Esthetics posts #1 (REFORPOST, Angelus, USA) were used for the fabrication of anatomic posts. The root canals were coated with separating medium, and post was treated with silane coupling agent (Silane Bond Enhancer, Pulpdent, USA) for 1 min. A dual-cure, glass-reinforced composite (ParaCore, Coltene) was adapted to the post and seated to reproduce the canal anatomy. Light curing was done for 20 s intraorally and extraorally. After confirming the fit, the canal was rinsed with 17% liquid ethylenediaminetetraacetic acid (EDTA) for 1 min, etched with 37% phosphoric acid gel for 15 s, rinsed, and dried using paper-points. Universal bonding agent (Tetric N-Bond Universal, Ivoclar) was coated into the canal and light-cured for 20 s. Finally, the anatomic posts were coated with dual-cure composite (ParaCore, Coltene), firmly seated in the canal, and light cured. Figure 1e and f illustrate the fabrication and cementation of the anatomic posts. Tooth preparations were done [Figure 1g], and impressions were made with addition silicone (Aquasil, Dentsply Sirona, Australia). Bite registration and shade selection were completed, and teeth were temporized [Figure 1h-j] Lithium disilicate crowns (IPS E-Max), A3.5 shade, medium opaque with incisal translucency, were fabricated.

Patient was recalled after 4 days for verifying crown fit and esthetics. Teeth were isolated using the split rubber dam technique and etched with 37% phosphoric acid gel. Following rinsing and drying, the teeth were coated with universal bonding agent (Tetric N-Bond Universal) and cured for 20 s. Simultaneously, the intaglio surfaces of the crowns were etched using buffered 9% hydrofluoric acid (Ultradent Porcelain Etch, Ultradent, South Jordan) for 90 s and rinsed. After drying, the surface was coated with silane coupling agent (Silane Bond Enhancer, Pulpdent, USA) for 60 s. The crowns were luted using light-cure resin cement (Variolink N LC Clear, Ivoclar). Tack curing was done for 3 s on all sides, and excess material was removed. Final curing was done for 20 s. Occlusion was adjusted using articulating paper. Excess cement was removed interproximally by flossing. Figure 2a shows the immediate postoperative image. Oral hygiene maintenance instructions were given. At 1-month and 6-month follow-up, excellent gingival healing, crown fit, and patient satisfaction were observed [Figures 2b-d].

Figure 2.

(a) Immediate postoperative clinical image, (b) 1 month follow-up, (c) 6 month follow-up clinical image, (d) Final postoperative radiograph

Case 2: Endodontic management of severely damaged maxillary central incisor with canal obliteration

A 35-year-old male patient presented with the chief complaint of fractured upper tooth and history of trauma 1 year ago. Intraoral examination revealed Ellis Class III fracture of tooth 21, which was discolored and nonresponsive to pulp vitality tests. Pulpal obliteration was evident on radiographic examination. Tooth 31 exhibited occlusal interference due to crossbite, compromising anterior guidance and esthetics [Figure 3a and b]. Based on clinical and radiographic findings, the extraction of 31 and nonsurgical endodontic management of 21 were planned to restore esthetics and function.

Figure 3.

(a) Preoperative clinical image, (b) Preoperative radiograph, (c) Root canal negotiation and working length determination, (d) Placement of intracanal medicament, (e) Radiograph showing obturation, (f) Fibre-post cementation, (g) Tooth preparation for final restoration, (h) Immediate postoperative clinical image, (i) Immediate postoperative radiograph, (j) Follow-up clinical image, (k) Follow-up radiograph

Local anesthesia was administered using a 27-gauge needle and 2% lidocaine with 1:100,000 epinephrine (Xylocaine, Dentsply Sirona, Charlotte, NC) was administered. After achieving the profound anaesthesia, rubber dam Hygenic^®Dental Dam (Coltene, Altstätten, Switzerland) and #2 clamp (Fiesta Color Coded Clamps, Coltene), the access cavity was prepared using the Endo-Z bur (Dentsply Maillefer). The obliterated canal was negotiated under a dental operating microscope (OPMI PROergo, Carl Zeiss, Oberkochen, Germany) under ×4.5 magnification with precurved #8 and #10 C + files (Dentsply Mallefer). Working length was determined using an apex locator (Root ZX mini, J. Morita, Tokyo, Japan), followed by radiographic confirmation [Figure 3c]. Biomechanical Preparation was done using the Protaper Gold (Dentsply Maillefer) in conjunction with NSK Endomate DT endomotor. Systematic irrigation protocol was performed with 3% sodium hypochlorite, 17% EDTA, and sterile saline, used in alternating sequence (5 mL each). The canal was dried with sterile paper points, and calcium hydroxide with iodoform (Vitapex®, Morita, Tokyo, Japan) was placed as an intracanal medicament [Figure 3d]. A temporary restoration was placed using light-cured glass ionomer cement (GC Universal Restorative, GC Corporation).

At the 2-month follow-up, the patient was asymptomatic, and radiographs showed periapical healing. Vitapex was removed, and obturation was completed using F2 gutta-percha cone (Dentsply Maillefer) [Figure 3e]. Post space was prepared using Peeso-reamers (MANI Inc., Japan). Aesthetics post #1 (REFORPOST, Angelus, USA) was treated with silane coupling agent (Silane Bond Enhancer, Pulpdent) for 60 s and cemented using dual-cure, glass-reinforced composite (ParaCore^®, Coltene) [Figure 3f]. Tooth preparation was completed, and final impressions were made using two-stage putty-wash technique with polyvinyl siloxane (Aquasil®, Dentsply Sirona). Figure 3g illustrates the clinical image showing tooth preparation. Shade selection (A2), bite registration, and temporization were done in the same appointment.

A monolithic lithium disilicate ceramic crown (IPS e.max) was fabricated and evaluated for esthetics, marginal integrity, and occlusion. Final cementation was done with light-cure resin cement (Variolink N LC Clear, Ivoclar) [Figure 3h and i shows postcementation immediate clinical and radiographic image]. Occlusion was verified and adjusted accordingly. At subsequent follow-up, the patient remained asymptomatic [Figure 3j and k illustrates the clinical and radiographic image of the follow-up]. Radiographic evaluation demonstrated progressive periapical healing, and soft-tissue health was satisfactory. The patient expressed satisfaction with the esthetic and functional outcome.

Discussion

The cases present a multidisciplinary management of two patients with grossly mutilated anterior teeth, each requiring a tailored approach to achieve functional and esthetic rehabilitation.

In Case 1, anatomic fiber posts were fabricated due to extensive loss of coronal and radicular dentin. The custom adaptation of the fiber post using dual-cure composite resin allowed for precise conformation to the internal root anatomy, reducing voids and improving post retention. This technique enhances the monoblock effect, wherein the post, core, cement, and dentin form a unified biomechanical unit that distributes masticatory stresses evenly. Studies by Caceres et al. and Grandini et al. have demonstrated that anatomic posts result in better stress distribution and fewer gaps at the adhesive interface, improving both retention and fracture resistance.[6,7]

The second case presented a 35-year-old male with a calcified canal in the maxillary central incisor. Advanced endodontic techniques, including guided access under magnification, facilitated successful canal negotiation and obturation. A prefabricated glass fiber post was selected, which were clinically appropriate due to relatively regular post spaces and the presence of adequate remaining dentin. Their use remains justified when the root canal morphology allows for conservative post space preparation without excessive removal of radicular dentin. After luting the post, a ceramic crown was fabricated to restore function and esthetics. This approach underscores the efficacy of combining modern endodontic procedures with reliable prosthetic solutions for complex cases.[8] Table 1 illustrates the summarized overview of the patient clinical presentation, treatment protocols, and the clinical outcomes.

Table 1.

Summary of clinical case details, treatment protocols, and clinical outcomes

Parameter	Case 1	Case 2
Patient demographics	19-year-old female	35-year-old male
Chief complaint	Broken upper front teeth	Fractured and discolored maxillary incisor
Diagnosis	Severely mutilated anterior teeth, previously root canal treated	Ellis class III fracture with canal obliteration
Key clinical challenges	Extensive coronal loss, gingival inflammation	Calcified canal, esthetic and occlusal imbalance
Endodontic treatment	Previously completed; post space preparation required	Microscope-assisted canal negotiation and obturation
Postsystem used	Custom anatomic fiber-reinforced post	Prefabricated glass fiber post
Crown type	Lithium disilicate (IPS e.max)	Lithium disilicate (IPS e.max)
Adhesive system	Dual-cure resin composite (ParaCore) + Universal bonding system	Dual-cure resin composite (ParaCore) + Universal bonding system
Adjunct procedures	Laser gingivectomy for crown lengthening	Extraction of 31 for esthetic correction
Postoperative esthetics	Excellent integration and contour	Excellent shade match and symmetry
Gingival health at 1 month	Stable, no signs of inflammation	Healthy tissue response
Restoration fit and retention	Optimal; no marginal discrepancy	Optimal; precise crown adaptation
Functional outcome	Proper incisal guidance re-established	Anterior guidance and occlusion corrected
Radiographic follow-up	No apical pathology noted	Evidence of progressive periapical healing
Patient satisfaction	High	High
Complications	None observed	None observed

IPS: International Prosthetic System

It is important to note that the selection of the post system should be dictated by the root anatomy and degree of structural compromise. Recent literature supports the use of fiber-reinforced posts in restoring endodontically treated teeth. Alshabib et al. reviewed the evolution and current practices of dental fiber-post systems, emphasizing their favorable mechanical properties and esthetic advantages.[9] A systematic review by de Morais et al. demonstrated that fiber posts significantly reduce the risk of tooth fracture compared to no post placement.[10] Furthermore, Alshetiwi et al. evaluated the mechanical properties of anatomically customized fiber posts, concluding that they offer enhanced fracture resistance in weakened endodontically treated teeth.[11]

Anatomic posts are especially beneficial in teeth with noncircular, flared, or irregular canals, where standard posts would either be loose-fitting or require excessive cement, increasing the risk of debonding and failure.[12] These findings corroborate the clinical decisions made in the presented cases, reinforcing the importance of customized treatment planning to achieve durable and esthetically pleasing outcomes. In addition, lithium disilicate crowns offer excellent esthetic outcomes, high flexural strength (~360–400 MPa), and long-term durability in the anterior zone.[13] Patient feedback indicated a high level of satisfaction, showcasing the importance of material selection in meeting esthetic expectations.

The presented cases highlight how modern restorative dentistry, grounded in sound endodontic principles and biomimetic materials, can offer reliable solutions for structurally compromised teeth [Table 2 illustrates the biomimetic rationale for the restorative components]. These biomimetic strategies have profound implications for the rehabilitation of severely mutilated endodontically treated anterior teeth, where remaining coronal and radicular dentin is often minimal and structurally compromised.

Table 2.

Biomimetic components and their functional role

Component/material	Functional role in biomimetic reconstruction
Anatomic fiber post	Adapted well to canal anatomy, promoted uniform stress distribution, and preserved radicular dentin.
Dual-cure resin composite core	Mimics dentin modulus, promoted cohesive monoblock effect, enhanced retention
Universal adhesive system	Facilitated strong bonding to dentin and post, supported the integration with resin core
Lithium disilicate crown	Replicated enamel translucency, offered esthetic harmony and high flexural strength
Laser gingivectomy (in Case 1)	Re-established biologic width, improved emergence profile, and esthetic contour

Conventional techniques that depend on excessive mechanical retention may cause the tooth to become even weaker, raising the possibility of a catastrophic fracture. To optimize adaptability, retention, and stress distribution within the root, biomimetic techniques instead place an emphasis on maintaining the original tooth structure and using anatomically suited fiber-reinforced posts that closely resemble the internal canal architecture, while enhancing retention and stress distribution. Ultimately, such carefully customized interventions not only restore aesthetics and function but also contribute to the durability and success in challenging clinical scenarios.[14,15] These techniques promote a monoblock effect, whereby the bonded post, core, and dentin form a unified structure that behaves biomechanically like a natural tooth. This biomimetic assemblage, when complemented by recent adhesive resin systems and lithium disilicate crowns as shown in these cases, matches both the structural and esthetic characteristics of enamel and dentin. Furthermore, emerging materials such as bioactive and self-healing composites have demonstrated promise in improving dentin remineralization and long-term bond stability.[16] Collectively, these advancements highlight biomimetic dentistry as a clinically viable and scientifically advanced approach to replacing structurally deficient anterior teeth with increased durability, function, and cosmetic integrity. These evolving materials and techniques are indicative of a transformative future for the reconstruction of structurally compromised teeth, combining biological integration with restorative brilliance.

Limitations and future directions

Biomimetic restorative procedures provide clear advantages in the management of structurally impaired teeth by promoting conservative therapies while preserving the functional integrity of the remaining tooth structure. However, their clinical performance is technique-dependent, requiring precise material handling, adequate isolation, and personalized planning, all of which may limit consistency across operators and clinical situations. Furthermore, there is also a dearth of long-term clinical data about the robustness of adhesive interfaces and tailored fiber post systems, particularly where there has been significant coronal destruction. Future research should concentrate on the development of hydrolysis–resistant adhesives, bioactive interfaces that promote dentin regeneration, and the integration of computer-aided design/computer-aided manufacturing workflows for the creation of patient-specific restorations. Advancements in these areas could enhance their predictability, efficiency, and biological compatibility of biomimetic restorative protocols.

Conclusion

This case series illustrates that personalized, biomimetic strategies integrating advanced endodontic and restorative techniques can effectively rehabilitate structurally compromised teeth. Importantly, the treatment outcomes in this case series underscore the critical need for tailored, case-specific treatment planning in the effective rehabilitation of severely impaired anterior teeth. Rather than depending on standardized protocols, each case necessitated a diagnostic process that considered the patient’s unique anatomical, functional, and esthetic characteristics. Decision-making was profoundly influenced by a number of factors, including the amount and distribution of remaining dentin, the root canal system’s accessibility and structure, the periodontal condition, including gingival architecture and biologic width, occlusal dynamics, and esthetic expectations.

Personalized treatment planning is critical to achieving excellent restorative dental outcomes, especially when dealing with structurally weak teeth. Every clinical situation has unique anatomical, functional, and esthetic factors that must be carefully analyzed rather than approached using a predefined protocol. Tailoring the treatment plan to individual factors – such as the severity of structural loss, pulp and periodontal state, occlusal dynamics, and patient-specific esthetic expectations – allows for the selection of materials and techniques that are compatible with the biological and mechanical requirements for each case. This personalized approach not only increases the precision and predictability of the restoration, but it also diminishes the risk of complications and improves the long-term prognosis. As restorative techniques evolve to embrace minimally invasive and biomimetic principles, the need for comprehensive, patient-centered treatment planning becomes increasingly crucial for clinical success.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patients have given their consent for their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Conflicts of interest

There are no conflicts of interest.

Funding Statement

Nil.