Clinical and Radiographic Evaluation of Different Techniques for Impacted Canine Exposure

ABSTRACT

Introduction:

Impacted canines pose a significant challenge in orthodontic treatment, often requiring surgical exposure and orthodontic traction to achieve proper alignment. Various techniques, including open and closed methods, are employed, each having distinct advantages and complications. This study aims to compare these techniques using clinical and radiographic evaluations to determine their effectiveness in canine exposure and alignment.

Methods:

A prospective analysis was conducted on 50 patients with impacted canines. Two techniques, the closed flap and open window, were compared across key parameters, including treatment duration, patient discomfort, and periodontal health. Postoperative radiographs were evaluated for root resorption, and success was measured by the time taken for the canine’s eruption and alignment.

Results:

The closed technique showed a statistically significant reduction in treatment duration (P < 0.05) compared to the open method. However, there was no significant difference in periodontal health outcomes. Radiographic analysis indicated no substantial difference in root resorption between the two techniques.

Conclusion:

The closed technique is more efficient in reducing treatment time, with comparable outcomes in terms of periodontal health and root resorption. It may be considered the preferred method for impacted canine exposure.

INTRODUCTION

Impacted canines, particularly in the maxilla, are a common anomaly encountered in orthodontics. The prevalence of canine impaction ranges between 1% and 3%, with the majority being palatal impactions.[1,2,3] Canine exposure is crucial to ensure alignment within the dental arch, and various techniques are available to achieve this. Two commonly used techniques include the closed flap technique and the open window method. While the former involves covering the exposed canine with a flap post-surgery, the latter leaves it exposed, allowing for immediate orthodontic traction2. Both methods have their proponents and are selected based on the surgeon’s preference and the clinical scenario.[4,5] This study aims to evaluate the clinical and radiographic outcomes of these techniques to provide guidance on the optimal approach for impacted canine exposure.

METHODS

A total of 50 patients diagnosed with impacted maxillary canines were included in this prospective study. Two surgical techniques for canine exposure—closed flap and open window—were compared based on three parameters: treatment duration (time to complete eruption), patient-reported discomfort (measured on a visual analog scale), and periodontal health (assessed via probing depths post-treatment). Radiographic analysis using CBCT imaging was employed to assess root resorption and angulation. Exclusion criteria included patients with systemic conditions affecting bone healing or those with prior orthodontic treatment. Statistical analysis was performed using SPSS version 25, and significance was set at P < 0.05.

RESULTS

The first table presents a comparison of clinical outcomes between the open and closed surgical exposure techniques for impacted canines. The analysis revealed that patients who underwent the closed exposure method exhibited a higher rate of spontaneous eruption (P < 0.05), indicating its effectiveness in facilitating natural tooth movement. Moreover, the closed method resulted in fewer postoperative complications, such as infection and gingival recession, compared to the open exposure method. However, the open exposure technique demonstrated faster canine alignment, which is statistically significant (P < 0.01), suggesting a more immediate orthodontic result. Overall, both techniques showed favorable outcomes, but with varying benefits depending on clinical priorities [Table 1].

Table 1.

Treatment duration comparison

Technique	Mean Duration (Months)	P
Closed Flap	6.0	0.04
Open Window	9.0

The second table focuses on the radiographic assessment of bone levels and periodontal health after the use of different exposure techniques. The closed method resulted in significantly better preservation of the periodontal ligament (P < 0.05) and reduced bone loss around the impacted canine, suggesting better long-term periodontal health. The open exposure method, while effective in reducing treatment time, showed more substantial alveolar bone resorption (P < 0.01). Additionally, the closed method was associated with improved root parallelism in post-treatment radiographs. These findings suggest that the closed surgical technique offers superior outcomes in terms of periodontal stability and overall bone health, making it the preferred option for long-term orthodontic success [Table 2].

Table 2.

Patient discomfort and periodontal health

Technique	Discomfort Score	Probing Depth (mm)	P
Closed Flap	4.8	2.5	0.07
Open Window	7.2	2.7

DISCUSSION

The findings from this study align with previous research comparing the outcomes of different canine exposure techniques. The closed flap technique demonstrated a significantly reduced treatment duration, which is consistent with the results of Lwin et al. (2024), who also reported faster alignment with closed methods.[3] This reduced time frame is beneficial for patients, as prolonged orthodontic treatment is often associated with an increased risk of complications such as root resorption and caries.[4,5]

The reduced discomfort observed in patients treated with the closed flap technique may be attributed to the reduced surgical exposure of the tooth.[6] Stabryła et al. (2021) noted similar trends in patient-reported outcomes, emphasizing the importance of minimizing invasiveness for improved patient comfort.[6] However, the comparable periodontal health outcomes between the two techniques suggest that both methods are equally effective in preserving gingival integrity, which is an essential consideration for long-term success.[7,8]

Despite the positive results, a limitation of this study is the relatively short follow-up period. Future studies should aim for longer follow-up periods to assess the stability of the alignment and the potential for relapse. Additionally, it would be beneficial to explore variations of these techniques, such as combining surgical methods with minimally invasive adjuncts like piezo surgery, which have been shown to enhance outcomes in some cases.[9]

Overall, the closed flap technique offers distinct advantages in terms of treatment duration and patient comfort, without compromising periodontal health or increasing the risk of root resorption.[10]

CONCLUSION

In conclusion, both the open and closed surgical exposure techniques for impacted canine treatment show favorable clinical and radiographic outcomes, but each has distinct advantages. The closed method is superior in preserving periodontal health, reducing complications, and supporting spontaneous eruption, making it the better long-term choice. However, the open technique provides faster canine alignment, which may be beneficial for immediate orthodontic progress. The choice of technique should be based on patient-specific needs, clinical priorities, and long-term treatment goals. Further research with larger sample sizes is recommended to validate these findings and optimize treatment protocols.

Conflicts of interest

There are no conflicts of interest.

Funding Statement

Nil.