Rapid Maxillary Expansion Related Oxidative Stress and Periodontal Results

Lead sponsor

Recep Tayyip Erdogan University Training and Research Hospital is the lead sponsor of 85 studies on the registry; 19 are open to participants now.

Study arms

• Other
  TO

  1 week before the placement of the Hyrax appliance

  Other: Periodontal measurements (plaque index, gingival index and probing pocket depth scores ) · Other: Biochemical Sample Supply (Collection of serum and saliva samples)

• Other
  T1

  The day of the first clinical observation of sutural opening (5-7 days after activation)

  Other: Periodontal measurements (plaque index, gingival index and probing pocket depth scores ) · Other: Biochemical Sample Supply (Collection of serum and saliva samples) · Procedure: Rapid maxillary expansion with Hyrax appliance

• Other
  T2

  The day of completion of active expansion (3-4 weeks)

  Other: Periodontal measurements (plaque index, gingival index and probing pocket depth scores ) · Other: Biochemical Sample Supply (Collection of serum and saliva samples) · Procedure: Rapid maxillary expansion with Hyrax appliance

• Other
  T3

  The day of completion of the 3-month reinforcement period

  Other: Periodontal measurements (plaque index, gingival index and probing pocket depth scores ) · Other: Biochemical Sample Supply (Collection of serum and saliva samples) · Procedure: Rapid maxillary expansion with Hyrax appliance

Interventions

• OtherPeriodontal measurements (plaque index, gingival index and probing pocket depth scores )

  Plaque index (PI), gingival index (GI) and probed pocket depth (PPD) scores will be recorded at T0, T1, T2 and T3 assessment periods to evaluate the periodontal status and oral care effectiveness of the participants. PPD is the distance between the gingival margin and the sulcus base. Measurements will be made at 6 different sites (mesio-vestibular, vestibular, disto-vestibular, mesio-oral, oral, disto-oral) of each tooth using a Williams periodontal probe (Hu Friedy, Chicago, Illinois, USA). During the measurements, care will be taken to position the probe as parallel as possible to the long axis of the tooth and not to apply excessive force.

• OtherBiochemical Sample Supply (Collection of serum and saliva samples)

  Serum and saliva samples will obtained from all individuals included in the study at T0, T1, T2 and T3 for biochemical analyses. For standardisation purposes, blood samples will be collected from the antecubital fossa with the patients in a sitting position. After resting for 30 minutes (min) at room temperature, the samples will be centrifuged (4ºC at 3000 rpm for 5 min) and serum samples will be obtained. The samples will be transferred into eppendorf tubes and stored in the freezer (-80ºC) until the study day. Sampling will be performed early in the morning. Participants will be warned not to consume anything other than water for the last 12 hours and not to brush their teeth that morning. Individuals will be left with their mouths open for 5 min to allow saliva to accumulate at the floor of the mouth. Unstimulated saliva samples accumulated at the floor of the mouth will be collected and transferred to eppendorf tubes.

• ProcedureRapid maxillary expansion with Hyrax appliance

  Rapid maxillary expansion (RME) is the most commonly preferred treatment of skeletal jaw stenosis in the transversal direction. Bilateral anchorage is the process of increasing the transversal dimension of the midpalatal suture (sutura palatina media) by applying strong tensile forces in the lateral direction to the dentoalveolar structures of the teeth and/or palatal bone. The primary goal of treatment is to provide orthopedic movement through sutural separation.

Primary outcomes

1. Biochemical analyses - 8-OHdG

   8-OHdG is the most frequently encountered and best known mutagenicity of more than 20 oxidative base damage products of ROS in DNA. Since it is easily detected in living cells and body fluids, it is the most commonly used oxidative DNA damage marker. Serum and saliva levels will be measured using a suitable ELISA kit (Cayman Chemical DNA/RNA Oxidative Damage ELISA Kit Item No.589320) according to the manufacturer's instructions. The measurement principle is as follows: It is based on the competition between 8-OHdG from the sample and 8-OHdG-acetylcholinestarase conjugate (8- OHdG Tracer) from the kit for a limited amount of 8-OHdG monoclonal antibody covering the plate well. The colour intensity measured spectrophotometrically at 410 nm is directly proportional to the tracer and inversely proportional to the amount of free 8-OHdG in the sample.

   Time frame: a week before the treatment (T0), 5-7 days after activation (T1), 3rd week (T2), and after the completion of a 3-month retention period (T3)

2. Biochemical analyses - Oxidative Stress Index (TOS/TAS=OSI)

   Total Oxidative Status (TOS) is a current method used to detect lipid peroxidation and oxidative stress. TOS is considered to be a superior method compared to other methods due to the impracticality of measuring different oxidant molecules individually and the inability to fully reflect the interaction of oxidant molecules with each other. Total Antioxidan Status (TAS) is a biochemical parameter obtained as a result of the sum of the antioxidant capacities of all antioxidants in the biological samples examined. Oxidative Stress Index (OSI) is a proportional value obtained by dividing TOS by TAS. It is directly affected by total oxidative and antioxidant status and reveals the final oxidative status in a practical and understandable way. OSI value was calculated according to the following formula. OSI = TOS (mmol H2O2 Equiv./L) / TAS (mmol Trolox Equiv./L) x 100

   Time frame: a week before the treatment (T0), 5-7 days after activation (T1), 3rd week (T2), and after the completion of a 3-month retention period (T3)

Secondary outcomes

1. Clinical Periodontal Assessments-plaque index

   Plaque index (PI) scores will be recorded at T0, T1, T2 and T3 assessment periods to evaluate the periodontal status and oral care effectiveness of the participants. The amount and thickness of plaque causing gingival inflammation will be determined. The teeth will be dried by spraying light air and isolated. Each tooth will be scored by measuring with a probe from the gingival margin in six areas (mesiobuccal, distobuccal, mesial, distal, oral, vestibule).

   Time frame: a week before the treatment (T0), 5-7 days after activation (T1), 3rd week (T2), and after the completion of a 3-month retention period (T3)

2. Clinical Periodontal Assessments-gingival index

   Gingival index (GI) scores will be recorded at T0, T1, T2 and T3 assessment periods to evaluate the periodontal status of the participants. The periodontal probe will be placed in the gingival sulcus parallel to the long axis of the teeth from the gum edge. Measurements will be made from the area under the teeth and scoring will be done according to the surface characteristics of the gum. The value found will be divided by the number of teeth and the gingival index will be determined for the entire mouth.

   Time frame: a week before the treatment (T0), 5-7 days after activation (T1), 3rd week (T2), and after the completion of a 3-month retention period (T3)

3. Clinical Periodontal Assessments-probed pocket depth (PPD)

   PPD is the distance between the gingival margin and the sulcus base. Measurements will be made at 6 different sites (mesio-vestibular, vestibular, disto-vestibular, mesio-oral, oral, disto-oral) of each tooth using a Williams periodontal probe (Hu Friedy, Chicago, Illinois, USA). During the measurements, care will be taken to position the probe as parallel as possible to the long axis of the tooth and not to apply excessive force.

   Time frame: a week before the treatment (T0), 5-7 days after activation (T1), 3rd week (T2), and after the completion of a 3-month retention period (T3)