Hall Technique: Procedure: Hall Technique A preformed stainless-steel crown will be placed on a primary molar using the Hall Technique. This approach does not require local anesthesia, caries removal, or tooth preparation.
Digital Scan and Bite Registration Schedule:
* T0 (Baseline): Immediately before crown placement
* T1 (Immediate): Immediately after crown placement
* T2 (Two Weeks): Two weeks after crown placement
* T3 (One Month): One month after crown placement At each time point (T0-T3), digital scans of both the upper and lower arches will be obtained, and a bite registration will be recorded. These records will be used to generate three-dimensional digital models, which will be analyzed to assess occlusal relationships and monitor changes over time.
Study summary
Hall Technique is a non-invasive restorative approach for managing carious primary molars, increasingly used in pediatric dentistry due to its simplicity and patient tolerance. This study aims to evaluate and compare the occlusal changes that occur following Hall crown placement on different primary molar groups (maxillary first molar, maxillary second molar, mandibular first molar, mandibular second molar) using digital model analysis.
Eligibility
Sex
ALL
Min age
7 Years
Max age
10 Years
Healthy volunteers
Accepted
Inclusion Criteria:
Inclusion Criteria for Participants
* No skeletal or dental anomalies,
* ASA (American Society of Anesthesiologists) physical status classification of I or II ,
* Frankl Behavior Rating Scale score of 3 or 4,
* In the mixed dentition stage,
* Fully erupted permanent first molars in occlusal contact at maximum intercuspation
* No acute dental pain or need for emergency treatment,
* Presence of at least two primary molars with carious lesions scored as 3, 4, or 5 according to the ICDAS (International Caries Detection and Assessment System),
* Presence of an antagonist tooth for the molar planned to receive Hall Technique,
* Provision of verbal and written informed consent by the participant and legal guardian after reading or listening to the consent form and fully understanding its content.
Inclusion Criteria for Tooth
Based on Clinical Examination:
* No history of prolonged pain in response to thermal or chemical stimuli, or spontaneous pain suggestive of irreversible pulpitis,
* No sensitivity to percussion or palpation,
* Absence of both pathological and physiological mobility,
* No signs of swelling, fistula, or discoloration,
* Sufficient remaining tooth structure to retain a preformed stainless steel crown.
Based on Radiographic Examination:
* Radiolucent lesion associated with dental caries located within the outer one-third to two-thirds of the dentin, with a visible band of normal dentin between the lesion and the pulp,
* At least two-thirds of root length present,
* No signs of internal or external pathological or physiological root resorption,
* Intact lamina dura and normal periodontal ligament space,
* No periradicular bone loss surrounding the roots,
* No calcified masses in the pulp chamber.
Exclusion Criteria:
* Individuals with serious systemic or psychological conditions
* Participants who fail to attend follow-up appointments
* Those who exhibit excessive fear or anxiety reactions and are unable to cooperate during treatment
Primary outcome measure(s)
Cusp Tip Displacement (Linear Measurement in mm): — From Hall crown placement to 1 month after treatment completion The positional changes of the mesiobuccal, distobuccal, mesiolingual/palatal, and distolingual/palatal cusp tips of the crowned primary molar, as well as the cusp tips of the opposing teeth in maximum intercuspation with this tooth, will be measured by comparing the distances between each cusp tip across time points: T0 (immediately before crown placement), T1 (immediately after crown placement), T2 (two weeks after crown placement), and T3 (one month after crown placement).
Vertical Positional Change of the Maxillary Primary Canine Cusp Tip (Linear Measurement in mm) — From Hall crown placement to 1 month after treatment completion The vertical distance of the cusp tip of the maxillary primary canine located on the same side as the treated tooth will be measured at each time point: T0 (immediately before crown placement), T1 (immediately after crown placement), T2 (two weeks after crown placement), and T3 (one month after crown placement). The measurements will be compared within the same tooth across time points to assess any vertical displacement over time.
Vertical Positional Change of the Mesiobuccal Cusp Tips of All Permanent First Molars (Linear Measurement in mm) — From Hall crown placement to 1 month after treatment completion The vertical positions of the mesiobuccal cusp tips of all permanent first molars will be measured at each time point: T0 (immediately before crown placement), T1 (immediately after crown placement), T2 (two weeks after crown placement), and T3 (one month after crown placement). Intra-tooth comparisons will be performed to evaluate any vertical changes over time.
Anterior Occlusal Vertical Dimension (Linear Measurement in mm) — From Hall crown placement to 1 month after treatment completion The anterior occlusal vertical dimension will be assessed by measuring the vertical distance between the cusp tip of the maxillary primary canine and the cusp tip of the mandibular primary or permanent canine on the same side as the treated tooth. This measurement will be performed in maximum intercuspation at all time points: T0 (immediately before crown placement), T1 (immediately after crown placement), T2 (two weeks after crown placement), and T3 (one month after crown placement). If the mandibular primary or permanent canine on the same side is not present or cannot be measured, the corresponding canine on the contralateral side will be used.
Posterior Occlusal Vertical Dimension (Linear Measurement in mm) — From Hall crown placement to 1 month after treatment completion The posterior occlusal vertical dimension will be evaluated by measuring the vertical distance between the mesiobuccal cusp tips of the opposing maxillary and mandibular permanent first molars on the same side as the treated tooth. This measurement will be taken in maximum intercuspation at all time points: T0 (immediately before crown placement), T1 (immediately after crown placement), T2 (two weeks after crown placement), and T3 (one month after crown placement).
Change in Maximum Occlusal Contact Area (mm²) — From Hall crown placement to 1 month after treatment completion The change in maximum occlusal contact areas (in mm²) will be analyzed based on bite registration records. Since the Trios 3 software does not allow direct quantitative measurement of occlusal contact areas, the analysis will be performed using the color-coded occlusal contact maps generated by the software. Specifically, the red zones representing the areas of maximum contact will be identified from the screenshots, and their surface areas will be measured using the ImageJ software. This analysis will be two-dimensional, based on calibrated screenshots, and will provide a comparative assessment of occlusal contact area changes across different time points: T0 (immediately before crown placement), T1 (immediately after crown placement), T2 (two weeks after crown placement), and T3 (one month after crown placement).
Trial sites (1)
Facility
City
Region
Status
Ankara Yıldırım Beyazıt University Faculty of Dentistry
Ankara
Keçiören
Recruiting
More Ankara Yildirim Beyazıt University trials in Turkey
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
We use cookies to analyse site traffic and improve your experience. With your consent, we may also use cookies for advertising. You can change your choice at any time.