The efficacy of orthodontic treatments for anterior crowding with Invisalign compared with fixed appliances using the Peer Assessment Rating Index

Quintessence Int 49 (2018), No. 7  (14.06.2018)

Page 581-587, doi:10.3290/j.qi.a40511

Objective: The purpose of this retrospective study was to determine the efficacy of Invisalign in a large sample of patients compared to fixed appliances.

Method and Materials: The test group consisted of 100 patients treated with Invisalign compared with a control group treated with conventional fixed appliances matched for sex, age, and initial severity of malocclusion based on the amount of anterior dental crowding (Little Index) and the Peer Assessment Rating (PAR Index) scores. The retainer used was a 0.0175-inch multistranded stainless-steel wire bonded from canine-to-canine in the mandibular arch and from lateral inisor-to-lateral incisor in the maxillary arch. A paired t test was used to compare both initial and final PAR scores.

Results: There was an overall 80.9% improvement, and 63 subjects did not need any refinement. The mean number of aligners used was 14 (+ 15 for the refinements) in the maxillary arch and 29 (+ 14 for the refinements) in the mandibular arch. The mean duration of treatment was 14 months (+ 7 months for the refinements). Significant statistical differences were found in the posttreatment scores, within both the Invisalign group and the control group. No differences were found in the follow-up scores. Additionally, the duration of treatment was 4 months longer in the control group.

Conclusion: More than 90% of the subjects treated with Invisalign achieved a significant improvement, as shown by the PAR scores. A need for additional aligners was reported for 37% of the patients. Fixed bonded retainers seem to be a good option in preventing tooth relapse after Invisalign and fixed conventional treatments.

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Long-term follow-up of inactive occlusal caries lesions: 4-5-year results



To assess the clinical behavior of inactive caries lesion on the occlusal sites of permanent molars over 4–5 years and to estimate the risk for progression of caries-inactive sites compared with sound ones.


Clinical examinations were conducted at baseline (n = 258) and after 4–5 years and included the recording of dental plaque and dental caries at the occlusal surfaces and the eruption stage of each permanent molar.


One hundred ninety-three schoolchildren were followed (response rate of 74.8%), totalizing 1152 teeth. Of the children, 30.6% (n = 59) presented at least one molar containing an active lesion, filling, or that had been extracted; according to the activity criterion, inactive lesions presented around a twofold increased risk for caries progression than sound surfaces (OR = 2.34 95%CI = 1.51–3.62). Thirteen percent (n = 25) of the children presented at least one molar progressing to dentine cavity, filling, or extraction; according to the severity criterion, inactive caries lesions presented a significantly higher risk for progression when compared with sound surfaces (OR = 2.69, 95% CI = 1.50–4.83).


The vast majority of lesions (85–90%) identified as inactive enamel caries at baseline did not progress over 4–5 years. Despite this fact, it was possible to detect an increased risk for caries progression in caries-inactive occlusal sites compared with the sound ones.

Clinical relevance

Considering the low progression rates, inactive caries lesions do not need a specific caries-controlling treatment and should be monitored longitudinally in the same manner as sound surfaces.
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3M Expands Shade Portfolio of Esthetic Fluorescent Zirconia

St. Paul, MN – (June 8, 2018) Over the years, dental zirconia has developed into one of the most popular esthetic restorative solutions:  highly translucent, pre-shaded and – in the case of 3M™ Lava™ Esthetic Fluorescent Full-Contour Zirconia – now available with built-in, tooth-like fluorescence. In June 2018, the portfolio of this innovative material is expanding to include Lava Esthetic zirconia in all 17 shades – all 16 VITA® classical shades and one bleach shade.
Full-contour zirconia is trending in the esthetic zone, making it essential for dental labs to offer highly esthetic monolithic restorations. Competitive-minded dental technicians can achieve this through use of a zirconia material with an extraordinarily high esthetic potential. This is exactly what Lava Esthetic zirconia delivers with optimized translucency, a shade gradient designed for excellent match to VITA classical shades, and built-in fluorescence.
“With Lava Esthetic zirconia’s advanced optical features and the availability of 17 shades, a simple mill-sinter-glaze process is now generally sufficient to produce a desirable monolithic restoration,” says Jim Buchanan, National Accounts Manager, 3M Oral Care. “Situations that require the use of a “close enough” shade followed by manual color adjustments are a thing of the past. This benefit, combined with the fluorescent effect that comes from within the material, ensures that users of Lava Esthetic zirconia are taken to the next level of full-contour esthetics!”
For the placement of Lava Esthetic crowns and bridges 3M recommends 3M™ RelyX™ Unicem 2 Self-Adhesive Universal Resin Cement.  Please refer to Instructions for Use for the proper cementation procedure.   
More information about Lava Esthetic zirconia is obtained at
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3M, Lava and RelyX are trademarks of 3M or 3M Deutschland GmbH. Used under license in Canada. © 3M 2018. All rights reserved. All other trademarks cited herein are the property of their respective companies.

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