Associations Between Radiographic Inclination of Premolars and Maxillary Expansion
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Rapid palatal expansion.
- Who it may be relevant to
- Registry conditions: Maxillary Deficiency. Basic parameters: 6 years — 14 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Italy
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Associations Between Radiographic Inclination of Premolars and Maxillary Expansion: Retrospective Observational Study
Overview
Recruitment of patients treated using rapid maxillary expanders with dental anchorage, with pre-treatment panoramic X-rays and post-treatment models. In the initial phase of the study, the objective is to correlate the radiographic inclination of the upper permanent premolars in the pre-treatment orthopantomography to the expansion obtained at the end of therapy using a palatal expander with dental anchorage.
Detailed description
Maxillary transverse deficiency is a common malocclusion, frequently associated with unilateral or bilateral posterior crossbite, with a prevalence ranging from 8% to 22%. Since transverse development occurs earlier than vertical and sagittal development, inadequate transverse growth can also affect overall craniofacial development. This deficiency can impact aesthetics and functions such as creating excessive buccal corridor spaces, causing dental crowding, and reducing nasal cavity volume, which can lead to breathing difficulties. Thus, timely correction of maxillary transverse deficiency is crucial for harmonizing the relationship between the upper and lower jaws, as well as for enhancing aesthetics and functionality. Currently, rapid maxillary expansion (RME) is a widely accepted and established treatment for correcting maxillary constriction in patients during their peak growth period.
There is no protocol in the literature that investigates the need for transverse expansion of the upper jaw through the analysis of the inclination of the long axis of the upper premolars and canines. Therefore, the aim of this study is to investigate the predictability of the necessary expansion through the analysis of the inclination of the upper premolars and canines in orthopantomography.
In this retrospective study, patients who are scheduled for treatment using rapid palatal expanders with dental anchorage will be recruited. A requirement for recruitment will be the presence of pre-treatment orthopantomography.
The inclination of the tooth will be calculated between the long axis of the tooth and the middle line as previously described by Baccetti et all. In their works regarding impacted canines.
The achieved expansion will be evaluated based on the number of activations recorded in each individual patient's chart clinical records.
Interventions
- Other Rapid palatal expansion
Patients undergone orthopedic treatment with rapid palatal expander
Primary outcome measures
- Number of required activation for maxillary expansion [Time frame: T0 (pre-treatment casts/x-rays) and T1 (post-treatment casts/x-rays)]
Secondary outcome measures (1)
- Canine inclination [Time frame: T0 (pre-treatment x-rays) and T1 (post-treatment x-rays)]
Eligibility criteria
Inclusion criteria
- Patients scheduled for orthopedic treatment with rapid palatal expander
- Pre-treatment orthopantomography
- Pre and post treatment intraoral scan
Exclusion criteria
- Previous maxillofacial surgery
- cleft lip and palate
- premolar agenesis or extraction for fracture ecc.
- Previous orthopedic-orthodontic treatments
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Italy · 1 center
- Unit of Orthodontics and Pediatric Dentistry - Section of Dentistry - Department of Clinic — Pavia
Identifiers
NCT: NCT07095374 · 2025-PREMOLARSEXPANSION