An interventional study of Palatally impacted canine exposure using a surgical guide and Palatally impacted canine exposure using the conventional free.hand method in Impacted Tooth, sponsored by Semmelweis University. Active, not recruiting at 1 site in Hungary. Open to participants aged 11 Years to 18 Years. Per ClinicalTrials.gov, last updated 2026-04-22.
Sponsored by Semmelweis University · Not applicable, Interventional, and Treatment
The first choice therapy in case of palatally impacted canines is their exposure and orthodontic eruption to improve facial esthetics and prevent pathologies associated with impacted teeth and Temporomandibular Joint Disorders. Current solutions in digital dentistry allow the registration of three dimensional imaging datasets such as cone beam computed tomography (CBCT) and digital impression of the dentition and soft tissues obtained via intraoral scanning using orthodontic planning software. This allows the surgeon to visualize the position of the impacted canine prior to surgery and to design and manufacture a surgical guide to aid in the localization of the impacted tooth during surgery.
The aim of this randomized clinical trial is to assess the feasibility of surgical exposure of palatally impacted upper canines with open-eruption technique using a surgical template. The secondary purpose of this study is to compare this method with the conventional free-hand surgical exposure.
Patients included in this study are randomly assigned to two study groups. In Group 1 surgical exposure for open eruption of palatally impacted canines is performed following virtual planning using a surgical template. In Group 2 surgical exposure for open-eruption of palatally impacted canines is carried out using the conventional free-hand method.
We hypothesize that guided exposure of the impacted canines will be as successful as the conventional method with shorter surgical intervention and higher associated costs.
Objectives The aim of this randomized clinical trial is to assess the feasibility of surgical exposure of palatally impacted upper canines with open-eruption technique using a surgical template. The secondary purpose of this study is to compare this method with the conventional free-hand surgical exposure. Our null-hypothesis is that there will be no significant differences in the outcome measures between the two methods.
Materials and methods
Groups
Simple randomization is performed to determine whether patients are included in the test or control group. 20 patients are recruited per group. During continuous recruiting, sample size calculation is to be carried out to determine the actual number of patients included in this study.
Surgical planning The upper jaw of the patient is scanned using an intraoral scanner (IOS, Trios 4, 3Shape, Copenhagen, Denmark). Cone beam tomography (CBCT) scans (Green X, Vatech, Hwaseong, Korea) are performed before surgical exposure to assess the position, angulation, possible dilaceration, and bone coverage of the impacted canines. The scanning conditions are constant at 200 μm isotropic voxel size with 360◦ rotation, 94 kiloVolt (kV) tube voltage, 7.2 miliAmper (mA) tube current, and 9 s exposure time with a field of view of 15 × 8 cm. In the test group OnyxCeph³™ software is used to register the standard tessellation language (STL) file of the digital impression with the Digital Imaging and Communications in Medicine (DICOM) data of the pre-operative CBCT reconstruction by surface registration. A surgical template is designed to cover the palate, incisal, and occlusal surfaces of the dentition with an opening that outlines the window to be prepared to expose the impacted canine. Fused deposition modeling (FDM) is used for the rapid prototyping of the surgical template (FlashForge Creator Pro 4, Zhejiang Flashforge 3D Technology Co., Ltd, Jinhua City, China) using polylactic acid filament (PLA).
Surgery In both groups patients rinse their oral cavity with 0.2% chlorhexidine solution for 1 min before surgery and surgical interventions are performed under local anesthesia. In the test group the fit of the surgical template is a checked and a surgical laser (SiroLaser Blue, Dentsply Sirona, Charlotte, North Carolina, U.S.A.) is used for the exposure of the impacted canine. In the control group the surgeon relies on the surgical plan and their experience to localize the impacted canine. The attachment is bonded to the exposed canine by an orthodontist. Patients are instructed to clean the wound using toothpaste and toothbrush and to rinse with 0.2% chlorhexidine solution in the morning and in the evening for a week starting on the day after surgery. Anti-inflammatory drugs (25 mg diclofenac three times a day for 3 days) are prescribed to control postoperative pain
Management of participant-bias Surgical planning and interventions are performed by a skilled surgeon. The clinician performing the exposure of the impacted canine is not involved in the evaluation of the outcome measures. The examiner carrying out the measurement of the outcome variables was blinded to the surgical modality used during surgery.
122 studies on the registry are indexed under Tooth, Impacted; 15 are open to participants now.
This study's planned enrollment of 40 is below the median of 70 across 88 interventional studies indexed under Tooth, Impacted.
Browse Tooth, Impacted studies →Semmelweis University is the lead sponsor of 140 studies on the registry; 56 are open to participants now.
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Exclusion Criteria:
Other: Palatally impacted canine exposure using a surgical guide
Other: Palatally impacted canine exposure using the conventional free.hand method
Under local anaesthesia the tissues covering the palatally impacted canine are removed with the help of a surgical guide to expose the tooth, to allow the bonding of an attachment on its surface for orthodontic traction.
Under local anaesthesia the tissues covering the palatally impacted canine are removed to expose the tooth, to allow the bonding of an attachment on its surface for orthodontic traction. The surgeon relies on the surgical plan and their experience to localize the impacted canine.
Success of the intervention
Measures if an attachment could be bonded to the impacted tooth during the surgery.
Time frame: on the day of the surgery
Success of the open eruption technique
Measures whether the canine erupts in its correct place in the dentition following tha application of orthodontic forces.
Time frame: 1 year
Surplus costs of surgical planning and manufacturing the surgical guide
Measures the excess costs of the design and manufacture of surgical guides used in Euro.
Time frame: through study completion, an average of 1 years
Duration of the surgical intervention
Measures the duration of the surgery in minutes.
Time frame: during surgery
Postoperative pain
Pain and recovery reported by the patient after surgery, measured on 100 mm visual analog scale (VAS) on the evening of the intervention and in the following 7 days. 0 is the lowest score, which means that the patient experienced no pain at all following surgery, 100 is the highest score refering to the worst pain the patient had ever experienced previously.
Time frame: 1 week
Intra- and postoperative complications associated with surgery
Number of cases where bleeding, damage to neighboring teeth, roots, and anatomical structures, nerve damage, antro-oral communication or fistula, inflammation is observed during follow up.
Time frame: through study completion, an average of 1 years
Plan to share: No
Started May 2023 (actual). Primary completion is estimated for Apr 2028, 59 months after the start.
Of 55 non-industry interventional studies with no phase under Tooth, Impacted, half reached primary completion within 20 months of starting (the median), counting those still running; a quarter within 8 and three quarters within 35. This study's planned 59 months is above that.
Counting every sponsor, half of 56 studies reached it within 20 months; a quarter within 8 and three quarters within 34.
How these figures are worked out, and which studies are left out of them.
This study is active, not recruiting, as verified in Apr 2026. You cannot join it, but the record below documents what was studied.
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