Influence of Different Nanohybrid Flowable Composite Resin on Shear Bond Strength and Dimensional Changes of Invisalign Attachments After 6 Months of Brushing
The present study will be a single-center, split-mouth, randomized controlled clinical trial. Patients undergoing orthodontic treatment with Invisalign aligners will be enrolled after signing the informed consent. Two different flowable composite resins will be evaluated for the performing of attachments using a split-mouth design:

group A: Filtek Supreme Flow (3M Unitek, Monrovia, Calif)
group B: Grandioso Heavy Flow (VOCO GmbH, Cuxhaven Germany)

Digital impressions with iTero intraoral scanner will be performed; digital impressions will be performed after 3 months (T1) and 6 months (T2) from the baseline.

Digital scans will be used to assess any changes in shape and volume of the attachments per each different time frame. Each tooth will be separated from the others and superimpositions of the single tooth will be performed with ZEISS Inspect software.

After attachments placement, the clinicians will be asked to answer, on a scale from 1 to 10, to this questionnaire's questions about the two different flowable composites; each question is repeated for each composite resin.

Type of brushing (with manual or electric toothbrush) and hand of brushing will be recorded.
- EligibilityCriteria: Inclusion Criteria:  patients undergoing Invisalign orthodontic treatment  Exclusion Criteria:  enamel demineralizations - HealthyVolunteers: No - Gender: All - MinimumAge: 14 Years - MaximumAge: 70 Years - StdAgeList: Child, Adult, Older Adult