Retrospective Analysis of Complications and Survival of Teeth Restored Following Crown Lengthening

NCT07259187 | Completed

• 1 other identifier: MBRU-IRB-2022-97
• Study Type: observational
• Target: 81
• Locations: 1 country
• Sites: 1

Brief Summary

The ultimate goal for every dental restoration is to restore and maintain the dentition's functionality along with preserving periodontal support. The long-term success of a restored tooth depends on the retention of a healthy periodontium. When restoring a short clinical crown, the clinician may contemplate placement of subgingival margin to gain additional length for retention purposes. Thus, crown lengthening procedure is performed to gain access to the natural tooth structure while maintaining the periodontal health and to increase the retention of the restoration. A full crown restoration is needed to protect the compromised tooth from fracture. The prognosis of these teeth depends on the long-term success rate of each component of the overall treatment and the follow up maintenance. In order to assist dentists to make an evidence-based decision during treatment planning, this retrospective study aims to investigate the complications and survival rate of the teeth receiving crown following crown lengthening.

Conditions

Limited Tooth Structure; Crown Lengthening

Keywords

complications; survival rate; crown lengthening; endodontics

Outcome Measures

Primary Outcomes (1)

• Teeth survival

  tooth survival was defined as tooth remaining in situ with or without complications

  1 year or more postintervention

Study Arms (1)

single crowns post surgical crown lenghtening

Patients who underwent surgical crown lengthening prior to receiving single-crown restorations were contacted to participate in the study. The restored teeth were clinically and radiographically examined. Demographic data, patient- and tooth- related details, prevalence of prosthodontic, periodontal, and/or endodontic complications, as well as failure rate with underlying reason were documented and analyzed.

Diagnostic Test: Periapical radiograph

Interventions

Periapical radiograph DIAGNOSTIC_TEST

Clinical and radiographic examinations were completed for the treated teeth. For participants who had radiographs within past one year of examination no further radiographs were obtained. Demographic parameters, systemic and patient-related factors such as smoking, diabetes mellitus, parafunctional habits (self-reported or diagnosed bruxism and clenching), location of tooth (maxilla or mandible, anterior or posterior), history of treated periodontitis, history of endodontic treatment, and history of regular dental attendance were documented. Furthermore, periodontal status was evaluated by assessing mobility, probing pocket depth, bleeding index, plaque index, restorative margin position in relation to the gingival margin, and crown to root ratio based on periapical radiographs taken using long-cone parallel technique. In addition, prosthetic factors including crown material and opposing dentition, namely tooth, crown, or removable partial denture were recorded.

single crowns post surgical crown lenghtening

Eligibility Criteria

• Age: 18 Years - 70 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

Patients were included if both the CLP and crown placement procedures were performed by postgraduate residents in periodontology and prosthodontics departments, respectively, at X hospital. All patients aged between 18 and 70 years at the time of treatment, and for whom at least one year had elapsed since definitive crown placement

You may qualify if:

• Setting and Providers: The tooth received crown lengthening surgery (CLP) performed by postgraduate residents in Periodontology and subsequent definitive crown placement by postgraduate residents in Prosthodontics at X Hospital.
• Patient Characteristics:
• Age between 18 and 70 years at the time of the CLP. Able and willing to participate, with written informed consent obtained.
• \- Follow-up and Documentation Requirements: A minimum of 12 months had elapsed since placement of the definitive crown at the time of data collection. Baseline intraoral radiographs available prior to CLP to document periodontal and structural condition.
• \- Tooth-Level Clinical Criteria: Tooth mobility not exceeding Miller Class I at baseline. A planned or anticipated crown-root ratio ≥1:1 following CLP based on clinical and radiographic evaluation.

You may not qualify if:

• Procedure Purpose or Type: CLP performed exclusively for aesthetic indications.
• Cases involving intentional endodontic treatment and CLP performed solely to correct supra-eruption for prosthetic clearance (i.e., without biological indication).
• Baseline Dental and Periodontal Condition:
• Teeth exhibiting furcation involvement at baseline. Mobility greater than Miller Class I preoperatively.
• Teeth functioning as abutments for fixed dental prostheses, due to altered biomechanical loading.
• Treatment Completion and Record Accuracy:
• Absence or incompleteness of clinical or radiographic documentation prior to CLP. Incomplete endodontic, periodontal, or definitive restorative treatment at the time of review.
• The final restoration was not a full-coverage definitive crown.
• Follow-up and Participant Availability:
• Follow-up duration less than 12 months after crown placement. Patients who declined participation or could not be contacted for consent.

Sponsors & Collaborators

• Mohammed Bin Rashid University of Medicine and Health Sciences: lead

Study Sites (1)

Dubai Dental Hospital

Dubai, United Arab Emirates

Location

Related Publications (1)

• Ashnagar S, Barootchi S, Ravida A, Tattan M, Wang HL, Wang CW. Long-term survival of structurally compromised tooth preserved with crown lengthening procedure and restorative treatment: A pilot retrospective analysis. J Clin Periodontol. 2019 Jul;46(7):751-757. doi: 10.1111/jcpe.13124. Epub 2019 May 31.

  PMID: 31050812 RESULT

Study Officials

• Maanas Shah, BDS MSD CAGS MRACDS

  Mohammed Bin Rashid University of Medicine and Health Sciences

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: RETROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Assistant Professor

Study Record Dates

• First Submitted: November 19, 2025
• First Posted: December 2, 2025
• Study Start: March 22, 2022
• Primary Completion: March 31, 2023
• Study Completion: June 30, 2023
• Last Updated: December 2, 2025

Record last verified: 2025-10

Locations

AE (1)