RESULTS

All patients finished treatment with Class I molar relationships, normal overjet (2–4 mm) and normal overbite (2–4 mm). There was some relapse during the posttreatment phase.

Dental Changes

The treated group showed a statistically insignificant 0.4 mm of maxillary molar intrusion during treatment, whereas the controls exhibited 2.9 mm of eruption (Table 1). During the posttreatment phase, the maxillary molars erupted slightly, but not significantly, more in the treated than control group. From the initiation of treatment through the long-term follow-up, there was a statistically significant 2.8 mm between-group difference in the vertical maxillary first molar movements.

The mandibular molars erupted significantly more (2.3 mm) in the control than treated group. There were minimal posttreatment changes, with both groups showing less than 0.5 mm of eruption. Overall, the treated mandibular molars exhibited 3.7 mm of relative intrusion (relative to the controls), which was a statistically significant vertical treatment effect.

During treatment, the maxillary incisors erupted and were extruded 2.85 mm, whereas the control incisors erupted significantly less (1.25 mm). Posttreatment, the maxillary incisors remained vertically unchanged in the treated group and erupted 0.6 mm in the control group. There was a 2.7 mm overall change of the maxillary incisor in the treated group compared to a 1.4 mm change in the control group.

The vertical position of the mandibular incisors did not change significantly during treatment (−0.1 mm), and they erupted slightly posttreatment (0.3 mm). The overall vertical change was only 0.4 mm. The control group showed 3.3 mm of vertical eruption, which was significantly more than the overall change of the treated group.

Understanding the Effects of Vertical Tooth Movement in Orthodontic Treatment: A Closer Look

When it comes to orthodontic treatment, one of the primary goals is often to correct the vertical positioning of teeth. Whether it's reducing extrusion, controlling eruption, or addressing issues like molar intrusion, understanding the exact changes that occur during and after treatment can help both clinicians and patients set realistic expectations. A recent study comparing treated and control groups offers valuable insights into the outcomes of vertical tooth movements.

Molar Intrusion and Eruption: A Closer Look

During the treatment phase, the control group showed a modest eruption of 2.9 mm. However, in the treated group, maxillary molars experienced a statistically insignificant intrusion of just 0.4 mm (Table 1). Despite this minor shift, the treated group’s molars did show a slight tendency to erupt more during the post-treatment phase, though not substantially compared to the control group.

The most notable finding was the difference in the vertical movement of maxillary first molars between the two groups. Across the study period, the treated group experienced a statistically significant 2.8 mm of movement, suggesting that vertical maxillary molar movements can vary quite a bit depending on the treatment protocol.

Mandibular Molar Changes: A Noticeable Eruption

When examining the mandibular molars, the control group demonstrated a more significant eruption (2.3 mm) compared to the treated group, whose eruption was less than 0.5 mm. This indicates that post-treatment changes in both groups were limited, with less vertical movement in the treated group. However, there was a clear vertical treatment effect, with the mandibular molars in the treated group showing a relative incursion of 3.7 mm compared to the controls.

Maxillary Incisors: Intrusion and Extrusion Patterns

One of the more interesting results from the study pertains to the movement of maxillary incisors. In contrast to the control group’s incisors, which erupted just 1.25 mm, the maxillary incisors in the treated group experienced both eruption and extrusion, with a 2.85 mm change observed during therapy. Post-treatment, the control group’s incisors erupted by 0.6 mm, while the treated group’s incisors remained virtually unaltered vertically.

Over the course of treatment, the treated group’s maxillary incisors changed by a total of 2.7 mm, while the control group’s incisors saw only a 1.4 mm change. These differences highlight the role of the treatment in controlling vertical movements, especially when it comes to anterior teeth.

Mandibular Incisors: Minimal Vertical Change

As for the mandibular incisors, the results were relatively modest. After therapy, these incisors experienced a small eruption of just 0.3 mm, and their vertical position remained mostly unchanged with a slight 0.1 mm alteration. In comparison, the control group’s mandibular incisors erupted more significantly (3.3 mm) during the treatment period.

Key Takeaways

This study sheds light on the nuanced effects of orthodontic treatment on vertical tooth movements. Key observations include:

• The treated group showed minimal intrusion of maxillary molars during treatment, but some post-treatment eruption was observed.
• Mandibular molars exhibited a more substantial vertical treatment effect, with a relative incursion of 3.7 mm in the treated group.
• Maxillary incisors in the treated group experienced more significant changes (2.7 mm overall) compared to the control group (1.4 mm).
• The mandibular incisors, both in the treated and control groups, showed limited vertical change after treatment.

While the study shows that vertical tooth movements vary across different tooth groups, the findings emphasize the importance of tailored treatment plans to control eruption and intrusion in specific areas. This kind of data is crucial for both clinicians and patients when deciding on treatment goals and understanding expected outcomes.

Summary

Orthodontic Treatment Results and Impact on Vertical Tooth Movement

• All patients completed treatment with Class I molar relationships, normal overjet, and overbite.
• Post-treatment, some relapse occurred.
• The treated group showed insignificant 0.4 mm of maxillary molar intrusion during treatment, while the controls showed 2.9 mm of eruption.
• The treated group showed a slight increase in eruption during the post-treatment phase.
• The mandibular molars erupted significantly more in the treated group (2.3 mm), with minimal post-treatment changes.
• The treated mandibular molars exhibited 3.7 mm of relative intrusion, a significant vertical treatment effect.
• During treatment, the maxillary incisors erupted and were extruded 2.85 mm, while the control incisors erupted significantly less (1.25 mm).
• The treated group experienced a 2.7 mm overall change of the maxillary incisor, compared to a 1.4 mm change in the control group.
• The vertical position of the mandibular incisors did not change significantly during treatment, and they erupted slightly post-treatment (0.3 mm).
• The study suggests that vertical maxillary molar movements can vary depending on the treatment protocol.