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Accuracy of Composite Attachment Position with Four Different Indirect Bonding Techniques

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posted on 06.08.2019, 00:00 authored by Zesheng Chen
Introduction: Our objective was to evaluate the attachment transfer accuracy of four indirect bonding technique variations based on tray sectioning. Materials and Methods: Twenty 3D printed dental models without attachments were bonded with composite resin attachments using 0.5mm thermoform plastic template trays fabricated from physical reference models. Four IDB technique variations were studied, n=5 for each technique: 1) whole arch (Whole), 2) whole arch, buccal segment only (Halves), 3) sextants (Thirds), and 4) sextants, buccal segment only (Sixths). Dimensional deviation of attachment position was evaluated in the buccal-lingual (B/L), mesial-distal (M/D), incisal-gingival (I/G) dimensions, and in tip through model digitization and 3D software superimpositions with the reference digital model. Clinical significance cutoffs were set at 0.25mm for linear measurements and 1° for angular measurements. ANOVA and multiple comparisons were performed. Statistical significance was set at 0.05. Results: Across all techniques, a total of 142 attachments were evaluated. B/L- Left side attachments had more mean discrepancy than right side attachments, and there was a lingual bias of all attachments. M/D- The Thirds group had less deviation than all other techniques (p < 0.05). Across all attachments, there was virtually zero bias towards the mesial or distal. I/G- The Wholes and Sixths groups had the least and greatest deviation, respectively, and the difference was significant (p < 0.05). There was an incisal bias across all attachments. Tip- There was approximately a 1° distal root tip bias across all attachments. Overall, no mean linear deviations reached the clinical significance threshold, but mean angular deviations did. Conclusions: In general, all IDB techniques studied achieved clinically acceptable and similar attachment positions in the B/L, M/D, I/G, dimensions, and marginally acceptable tip angulation.

History

Advisor

Atsawasuwan, Phimon

Chair

Atsawasuwan, Phimon

Department

Orthodontics

Degree Grantor

University of Illinois at Chicago

Degree Level

Masters

Committee Member

Nicholas, Christina Viana, Grace Thalji, Ghadeer

Submitted date

May 2019

Issue date

20/03/2019

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