Evaluation of surface roughness, mechanical characteristics and thickness of directly printed aligners: an in-vivo experiment
- Conditions
- Orthdontic treatment of dental malalignment using clear aligner therapy
- Registration Number
- DRKS00030417
- Lead Sponsor
- Zentrum der Zahn-, Mund- und Kieferheilkunde (Carolinum) der Johann Wolfgang Goethe-Universität Frankfurt am Main
- Brief Summary
Surface roughness: One week of intra-oral usage increased the surface roughness and porosity of the DP aligners significantly. On the contrary, a significant reduction in the surface parameters of Invisalign aligners was recorded following intra-oral service. Results of the present study suggest an increase in the surface roughness and surface porosity of directly printed aligners, which might lead to an increase in bacterial adhesion and biofilm formation in these aligners. Mechanical properties: Even though, unused directly printed and Invisalign aligners have comparable HM and elastic index, the much higher RIT in directly printed aligners suggests the higher force decay in these aligners. A duration of 7 days intraoral aging did not affect the mechanical properties of the thermoformed clear aligners in our study. Aligner-Thickness: Statistically significant differences were found between the materials in both Clin and Ctr categories (p < .001). Group DP had the highest thickness among the groups and the least thickness was observed in the CA group (p < .001). However, intraoral ageing did not significantly affect the aligner thickness of any groups. Conclusions: Both thermoforming and direct printing of clear aligners led to thickness deviations in terms of increase for printed aligners and decrease for thermoformed aligners. Intraoral ageing did not affect the aligner thickness in any of the groups.
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- Complete
- Sex
- All
- Target Recruitment
- 36
Complete permanent dentition (without aplasies), healthy pardont, probing depth of blow 3 mm, good oral hygiene of gingival and plaque index below or equal to 1, skeletal class I or II malocclusion, mild crowding in the anterior segment of the teeth.
systematic diseases, use of medications, attachment loss, prothetic restorations in a form of crowns, bridges or partial prosthetics, untreated caries, smoking, pregnancy or breast feeding, history of trauma, CMD, bruxism or parafunction, previous orthodontic treatment, chemotherapy or radiation in the past 6 months, skeletal class III malocclusions, severe crowding, extraction treatment, lack of compliance
Study & Design
- Study Type
- observational
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method The primary objective is to compare the surface roughness, mechanical characteristics and thickness of direct printed aligners using the TC-85 DAC polymer after a week usage by patients in comparison to the SmartTrack material of Invisalign aligners and conventional in-house aligners.
- Secondary Outcome Measures
Name Time Method The secondary objective is to compare surface roughness of direct printed aligners using the TC-85 DAC polymer after a week usage by patients in comparison to the SmartTrack material of Invisalign aligners and conventional in-house aligners..