This case documents the treatment of a patient with maxillary and mandibular crowding, excessive overjet, and skeletal Class II relationship. The patient was treated using a non-extraction Invisalign approach with interproximal reduction, achieving improved occlusion and smile aesthetics over an 18-month treatment period.

Patient Overview

The patient presented with concerns about crowding and excessive overjet. They desired a better smile and aligned teeth. The patient had a convex profile and a retrognathic mandible, indicating a skeletal component to their malocclusion. There was also minimal attached gingiva present on teeth number six and twenty-seven, which required monitoring throughout treatment.

Chief Complaint

The patient's primary concerns were crowding and overjet. They were motivated to improve the alignment of their teeth and achieve a more aesthetic smile.

Diagnostic Findings

Clinical and radiographic evaluation revealed a convex profile with a retrognathic mandible. The patient presented with maxillary and mandibular crowding, excessive overjet, and midline shifts. Additionally, there was minimal attached gingiva on teeth number six and number twenty-seven. The skeletal relationship indicated a Class II pattern, and achieving ideal occlusion would have required surgical intervention if a full skeletal correction was desired.

Treatment Options Considered

Several treatment approaches were discussed with the patient. The first option was braces or Invisalign combined with orthognathic surgery to address the skeletal discrepancy. The second option involved braces or Invisalign with extractions of the upper and lower first premolars to relieve crowding and reduce overjet. The third option was a non-extraction approach using braces or Invisalign with interproximal reduction and elastics to improve alignment and reduce overjet without surgery or extractions.

Selected Treatment Plan

After reviewing all available options, the patient chose to proceed with non-extraction Invisalign treatment combined with interproximal reduction. This approach allowed for improvement in alignment, overjet, and midlines without the need for surgery or extractions. The patient was informed that while the Class II relationship, midlines, and excessive overjet would improve, full correction would not be achieved without surgical intervention. The patient accepted these treatment limitations and was comfortable with the anticipated result.

Procedures Performed

The patient was scanned and initial records were taken for Invisalign treatment planning. At the first appointment, aligners were delivered, attachments were placed, and instructions for wear and care were provided. At each subsequent appointment, interproximal reduction was performed to create space and facilitate tooth movement. After the first set of aligners was completed, a second scan was performed and refinement aligners were ordered to fine-tune the occlusion. Additional interproximal reduction was completed during the refinement phase. Throughout the treatment, the patient wore elastics on the right side to assist with midline correction and bite improvement. The total treatment time was 18 months.

Materials and Technologies Used

Invisalign clear aligners were used throughout the treatment. Attachments were bonded to the teeth to facilitate controlled tooth movement. Interproximal reduction was performed using standard instrumentation to create space for alignment. Elastics were prescribed and worn by the patient on the right side to assist with occlusal correction.

Clinical Challenges

The patient had minimal attached gingiva on teeth number six and twenty-seven. Due to this finding, the possibility of needing gingival grafts was discussed with the patient prior to and during treatment. The patient was monitored closely throughout the treatment process. Fortunately, the patient responded well to treatment, and gingival grafting was not required. Another challenge was managing the patient's expectations regarding the skeletal Class II relationship. The patient was informed that the Class II relationship, midlines, and excessive overjet would improve but not be fully corrected without surgical intervention. The patient understood and accepted this compromise.

Final Outcome

At the completion of treatment, the patient achieved a significantly improved smile with better alignment, reduced overjet, and improved occlusion. The patient was seen at four months post-treatment and again at one year post-treatment. At both follow-up appointments, their teeth and bite remained stable, and they maintained a beautiful smile. The minimal attached gingiva on teeth number six and twenty-seven remained stable without the need for grafting.

Clinical Lesson for Other Dentists

This case illustrates the importance of clear communication regarding treatment limitations when addressing skeletal discrepancies with non-surgical approaches. While the patient had a skeletal Class II relationship that would have ideally been corrected with orthognathic surgery, they achieved meaningful improvement through non-extraction Invisalign treatment with interproximal reduction and elastics. Managing patient expectations is critical in these cases. The patient was informed from the outset that full correction of the Class II relationship and excessive overjet would not be achieved without surgery, and they accepted this compromise. Additionally, monitoring gingival health, especially in patients with minimal attached gingiva, is essential throughout clear aligner therapy. In this case, the patient responded favorably without the need for grafting, but the risk was identified and discussed in advance.

Treatment Results

• Maxillary and mandibular crowding was resolved through interproximal reduction and aligner-guided tooth movement
• Excessive overjet was significantly improved, though not fully corrected due to the non-surgical approach
• Midline shifts were improved with the assistance of elastics on the right side
• Occlusion was improved, and the patient achieved a stable bite with acceptable function
• Minimal attached gingiva on teeth number six and twenty-seven remained stable without the need for gingival grafting
• The patient reported satisfaction with their smile and alignment at the completion of treatment
• Stability was confirmed at four months and one year post-treatment with clear retainers worn nightly

Related Dental Services

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