Facilitating CAD/CAM nasoalveolar molding therapy with a novel click-in system for nasal stents ensuring a quick and user-friendly chairside nasal stent exchange

Treatment outcomes of digital nasoalveolar moulding in infants with cleft lip and palate: A systematic review with meta-analysis

The aim of this systematic review was to compare the treatment outcomes of digital nasoalveolar moulding (dNAM) technique with conventional nasoalveolar moulding (cNAM) or non-presurgical intervention protocol in infants with unilateral (UCLP) or bilateral (BCLP) cleft lip and palate. A bibliometric search by MEDLINE (via Ovid), Embase, Cochrane Library, grey literature and manual method was conducted without language restriction until November 2023. Literature screening and data extraction were undertaken in Covidence. The risk of bias was evaluated using the Newcastle-Ottawa Scale and RoB-2. Pooled effect sizes were determined through random-effects statistical model using R-Software, and the certainty of evidence was assessed using the GRADE approach. Among 775 retrieved articles, nine studies were included for qualitative synthesis (6-UCLP, 3-BCLP), with only three eligible UCLP studies for meta-analysis. In the UCLP group, very low certainty of evidence indicated no difference in alveolar cleft width (SMD, 0.13 mm; 95% CI, -0.31 to 0.57; I2, 0%), soft tissue (lip) cleft gap, nasal width, nasal height, and columellar deviation angle changes between dNAM and cNAM. In the BCLP group, qualitative synthesis suggested similar changes in alveolar, lip, and nasal dimensions with dNAM and cNAM. In both cleft groups (UCLP, BCLP), reduced alveolar cleft width was observed in the dNAM group compared to the non-presurgical intervention protocol, along with fewer clinical visits and reduced chairside time for dNAM compared to cNAM. It can be concluded that the treatment outcomes with dNAM were comparable to cNAM in reducing malformation severity and were advantageous in terms of chairside time and clinical visit frequency. However, the overall quality of evidence is very low and standardization is needed for the virtual workflow regarding the alveolar movements and growth factor algorithms. Registration: PROSPERO-database (CRD42020186452).

The accuracy and retention of presurgical infant orthopaedics constructed from different polymer materials: A comparative study

Objectives

This laboratory-based study aimed to evaluate and compare the accuracy and retention of moulding plates when used as pre-surgical orthopaedic appliances (PSIOs) for infants with cleft lip and/or palate (CL/P).

Methods

Ten moulding plates were fabricated from three different materials (total sample size: 30), including polymethyl methacrylate (PMMA), a hard clear aligner (PET-G polymer), and a dual-layered hard and soft clear aligner (mixed PET-G/EVA) on ten three-dimensional (3D) printed working models. Accuracy was evaluated by measuring the virtual gap between the data acquired from the moulding plate and the working model after the optical scanning at each of the designated 36 points for each plate. Exocad software was used to facilitate all virtual alignments and measurements. Retention was measured using a digital gauge that quantified the traction force required to separate the plates from the retention test cast (a soft resin printed cast).

Results

PET-G plates exhibited the best fit with the working cast, with overall adaptations of 0.146 ± 0.012 for PET-G, 0.250 ± 0.073 for PET-G/EVA, and 0.294 ± 0.113 for PMMA. For region-specific misfit, PET-G plates exhibited superior accuracy across all regions, with mean discrepancies of 0.16 ± 0.08 mm, 0.15 ± 0.061 mm, and 0.12 ± 0.128 mm in the anterior, middle, and posterior regions, respectively. Retention for PET-G was significantly higher than the other materials, with a mean of 3.34 N ± 0.487, as opposed to 1.65 N ± 0.331for PMMA and 1.27 N ± 0.239 for PET-G/EVA (P < 0.05).

Conclusions

Moulding plates constructed from PET-G exhibited a better fit and higher retention than those made from PET-G/EVA and PMMA.

Clinical significance

Collectively, our findings suggest that the selection of PET-G for PSIO appliances could have clinical significance by potentially improving treatment outcomes in infants with CL/P.

Defining the Treatment Gap in Nasoalveolar Molding: Factors Affecting the Utilization of NAM in an Urban Cleft Center

BACKGROUND

Many cleft centers incorporate NasoAlveolar Molding (NAM) into their presurgical treatment protocols. However, there are limited data on eligible patients who do not receive or complete NAM. This study characterizes the demographics associated with non-utilization or completion of NAM.

METHODS

A single-institution retrospective review was performed of all patients with cleft lip and alveolus undergoing primary unilateral and bilateral cleft lip repair from 2012-2020. Patients were grouped based on utilization or non-utilization of NAM. Demographic and treatment data were collected, including documented reasons for not pursuing or completing NAM.

RESULTS

Of 230 eligible patients, 61 patients (27%) did not undergo or complete NAM (no-NAM). In this group, 37 (60.7%) received no presurgical intervention, 12 (19.7%) received presurgical nostril retainers, 3 (4.9%) received lip taping, 1 (1.6%) received a combination of taping/nostril retainers, and 8 (13.1%) discontinued NAM. The most common reasons for not receiving NAM were sufficiently aligned cleft alveolus (21.3%), medical complexity (16.4%), late presentation (16.4%), and alveolar notching (18%). Compared to the NAM group, the no-NAM group had significantly lower rates of prenatal cleft diagnosis/consult, and significantly higher proportion of non-married and non-English speaking caregivers. Multivariable analysis controlling for insurance type, primary language, prenatal consult, marital status, and age at first appointment found that age at first appointment is the only statistically significant predictor of NAM utilization (P < .001).

CONCLUSIONS

Common reasons for non-utilization of NAM include well-aligned cleft alveolus, medical complexity, and late presentation. Early presentation is an important modifiable factor affecting rates of NAM utilization.

Recent Advances in Nasoalveolar Molding Therapy Using 3D Technology

Presurgical Nasoalveolar Molding (NAM) is an adjunctive treatment modality designed to reorient misaligned tissue structures and nasal cartilage in cleft lip and/or palate (CL/P) patients. Recent advances in NAM therapy focus on modifications to the intraoral molding plate or nasal stent intended to improve treatment outcomes, ease of use, compliance, and cost-effectiveness. Notably, 3D technological advancements have been employed to design NAM devices more efficiently and create objective, standardized means of measuring progressive morphological changes during therapy. These advances are designed to incorporate 3D technology in the treatment of cleft lip and/or palate to render it more precise, accurate, and time-efficient.

The Perception and Experience of Parents of Children with Cleft Lip and Palate Concerning the Use Pre-Surgical Infant Orthopedics: A Questionnaire-Based Cross-Sectional Survey

Background: A transitory period prior to the surgical correction of cleft lip and palate (CLP) is associated with adverse impacts, which may require a medical intervention. Pre-surgical infant orthopedics (PSIO) is deemed to reduce the functional and psychological burden, offering a transition until the definite surgical intervention. Aim: To assess the attitude of Iraqi mothers concerning the application and management of pre-surgical orthopedic appliances in children with cleft lip and palate, taking consideration of the mothers’ occupational status. Methods: The cross-sectional study was conducted in the College of Dentistry at Baghdad University from 5 January 2020 to 4 December 2021. A questionnaire form was validated based on existing data related to the assessment of parents’ satisfaction concerning PSIO. Results: A concern related to the impression procedure was reported by a minority of the participants (6.8%) and it was associated mainly to the perceptions of housewives’ vs. working mothers (p < 0.05). The perceived infants’ discomfort during the impression procedure reported at 11.9% was significantly associated with housewives’ status (p < 0.05). In general, the vast majority of respondents considered the impression as being non-invasive (96.6%). Most mothers found no difficulties in following the instructions of the specialist regarding the insertion of the PSIO and/or taping the elastic bands (62.7%). Respondents believed that CLP infants routinely require PSIO treatment. Interestingly, only a minority of mothers performed an Internet search to look for information about PSIO (7%). The majority indicated the PSIO treatment as beneficial for their infant and a substantial proportion of respondents were satisfied with the outcomes of PSIO, encouraging other parents to consent the PSIO treatment. Conclusion: In general, mothers broadly acknowledged the primary concept of PSIO and accepted the proposed treatment, with a positive attitude towards pre-surgical CLP management, regardless their socio-economic status. They seemed to understand well the expected benefits of PSIO, including feeding improvement, normalization of speech, and optimization of future surgical outcomes.

Mothers' knowledge and experience concerning presurgical orthopedic management for infants with cleft lip and palate

OBJECTIVES:

The present study aimed to assess the level of mothers’ knowledge toward cleft lip and palate and their experience concerning presurgical orthopedic management.

MATERIALS AND METHODS:

This was a cross-sectional study where the mothers were invited to complete a self-administered validated and reliable questionnaire. The questionnaire included questions that aimed to assess mother's knowledge related to the most prevalent aspects of cleft lip and palate anomaly itself and additionally, questions associated with presurgical orthopedic treatment as an adjunct therapy. Descriptive statistics were used to define the characteristics of the study variables. Chi-square test was utilized to assess relationships between categorical variables.

RESULTS:

Totally, 145 mothers completed the survey (response rate was 73%). Forty-six (46%) of the mothers provided an incomplete or improper definition of the anomaly and 35 (24%) claimed that they know the cause of the anomaly. The majority of mothers did not identify family history as a risk factor; consanguinity was identified in 29% (n = 42). Of the total, 58 mothers (40%) agreed that dental management of CLP requires teamwork and the majority (n = 126, 87%) recognized the plastic surgeon as the most important specialist. Mothers aged 20-30 years old (n = 42, 53%), and those who are university graduates (n = 38, 48%), as well as employed mothers (n = 52, 66%) have in general a higher degree of knowledge regarding cleft lip and palate (P < 0.001). More than half of the mothers (n = 70, 57%) reported that presurgical orthopedic treatment was useful and needed for their infants.

CONCLUSIONS:

Most of the mothers reported a high level of knowledge about cleft lip and palate and they experienced the usefulness of the orthopedic appliances for their infants. However, there was uncertainty in some parts such as definition, diagnosis, causes, and risk factors for cleft lip and palate. Therefore, understanding the causes of cleft lip and palate, as well as comprehensive education concerning the essential role of the orthopedic appliances to improve cleft lip and palate are crucial for mothers to improve their infants’ quality of life.

Complications During Grayson Presurgical Nasoalveolar Molding Method in Nonsyndromic Infants With Complete Unilateral Cleft Lip and Palate

INTRODUCTION

Within the treatment protocols of patients with cleft lip and palate, the nasoalveolar molding (NAM) acquire more followers every day.Their benefits have been well documented, but not equally their complications. The purpose of this study was to describe the complications produced during treatment with Grayson presurgical NAM in nonsyndromic infants with complete unilateral cleft lip and palate.

METHODS

Bibliographic review on 8 databases using search algorithms. By applying the exclusion and inclusion criteria, 21 articles were detected, which were analyzed in full text. Complication, cause, and solution data were presented in supplemental tables.

RESULTS

Complications are related to soft tissues, hard tissues, and those derived from care.

SOFT TISSUES

irritation, ulceration, gingival, facial, or nasal bleeding. Candidiasis. An overexpanded nostril creation to improper placement or modifications of the nasal stent at home.The most frequent were lip and cheeks skin irritation by taping, and gingival ulceration due to excessive pressure.

HARD TISSUES

misalignment of alveolar segments and the premature eruption of teeth.

DERIVED FROM CARE

inadequate device retention, adherence problems to treatment, poor/excessive care of the caregiver, intolerance to the device, eating problems, breathing, and socioeconomic issues.

CONCLUSIONS

The main complications occur in soft tissues, related to the retention mechanisms and an inadequate adjustment of the device.The benefits of NAM exceed the complications. It is necessary to know them to avoid any harmful results since they could prolong or stop the treatment, compromising the result. The active collaboration of the family in the insertion and maintenance of the device is crucial for success.

NAM-help or burden? Intercultural evaluation of parental stress caused by nasoalveolar molding: a retrospective multi-center study

Objectives

Nasoalveolar molding (NAM) was developed to facilitate easier treatment and better outcomes for cleft lip and palate (CLP) patients. The aim of this study was to investigate the parental burden and possible intercultural differences of this treatment modality, which is often argued to burden parents to an extraordinary amount.

Materials and methods

Standardized questionnaires (available in English, Mandarin, and German) with 15 non-specific and 14 NAM-specific items to be retrospectively answered by Likert scales by parents of unilateral CLP patients with completed NAM treatment.

Results

The parents of 117 patients from two treatment centers in Taiwan and Germany were included. A very high level of overall satisfaction was found in both countries with significant intercultural differences in prenatal parent information, feeding problems, dealing with 3rd party’s perception, and experienced personal effort.

Conclusion

NAM is an effective treatment tool for children’s CLP deformities and their caregivers in overcoming the feeling of helplessness. Intercultural differences may be due to infrastructural reasons, cultural attitudes and habits, or different public medical education.

Clinical relevance

In addition to facilitating easier surgical treatment, NAM can be seen as a powerful coping strategy for parents dealing with a CLP deformity of their child and does not seem to burden them extraordinarily.

Evaluation of the Clinical Effectiveness of Nasoalveolar Molding (NAM) Using Grayson Method Versus Computer-Aided Design NAM (CAD/NAM) in Infants With Bilateral Cleft Lip and Palate: A Randomized Clinical Trial

OBJECTIVE

The aim is to compare between the clinical effectiveness of nasoalveolar molding (NAM) versus the computer-aided design NAM (CAD/NAM) in patients with bilateral clefts.

DESIGN

The trial is a randomized comparative trial with 1:1 allocation ratio.

PARTICIPANTS

Thirty infants with bilateral complete cleft lip and palate were recruited.

INTERVENTIONS

Patients were randomized between NAM and CAD/NAM groups. The treatment steps described by Grayson were followed for the NAM group. In the CAD/NAM group, digitized maxillary models were made to create series of modified virtual models which were used to fabricate the molding plates using 3-dimensional printing technology. The nasal stents were then added to the plates following Grayson method. The study lasted for 4 months.

MAIN OUTCOMES

The primary outcome was to evaluate the changes in the intersegment cleft gap. Secondary outcomes included the analysis of the maxillary arch in transverse, anteroposterior, and vertical dimensions as well as the premaxillary deviation and rotation. Chair side time was assessed for both methods.

RESULTS

Both modalities decreased the intersegment cleft gap. The CAD/NAM plates caused more reduction in the total arch length by 1.99 mm (-3.79 to 0.19, P = .03) as compared to the NAM treatment. No differences were found between groups in the transverse and vertical maxillary arch changes.

CONCLUSIONS

Both interventions were effective in narrowing the cleft gap. Similar maxillary changes were found in both groups. The CAD/NAM modality required less chair side time compared to the NAM treatment.

Comparative Photographic, Retrospective Analysis of Nonsyndromic Cleft Noses Treated with or without NAM

Supplemental Digital Content is available in the text.

Background:

Long-term results and efficacy of nasoalveolar molding (NAM) on the perinasal region are reported controversially in the literature. With this study, we demonstrate our experiences, contribute to the ongoing discussion, and describe our decision-making when NAM is indicated or not.

Methods:

Conventional pre- and postinterventional photographs of patients with nonsyndromic unilateral and bilateral cleft lip and palate (UCLP and BCLP) were analyzed. The 2 independent raters were blinded to therapy (NAM versus non-NAM), and 7 parameters were measured. Intraclass correlation coefficient for intra- and interrater reliability was calculated. The Mann–Whitney U test was performed to compare therapy- and appearance-matched pairs. Finally, 30 specialists in cranio-maxillofacial surgery performed a subjective, blinded rating of matched NAM and non-NAM cases.

Results:

Thirty-six patients, 16 UCLP and 20 BCLP, were enrolled. The intraclass correlation coefficients for intra- and interrater reliability were excellent for all measurements, except for nasal sill (0.77 intrarater and 0.80 interrater). Height-to-width ratio (P = 0.012) was significantly different in the comparison of non-NAM and NAM-treated severe cases with UCLP. Thirty blinded raters evaluated NAM-treated cases with severe UCLP better than matched non-NAM cases. Non-NAM-treated cases with moderate UCLP and BCLP were rated better than matched NAM cases.

Conclusions:

Children with severe UCLP may benefit from NAM therapy in the sense of better symmetry and a more homogenous appearance. Patients with moderate UCLP and BCLP did not benefit, and the risk of the burden of care increased.

A novel method for fabricating nasoalveolar molding appliances for infants with cleft lip and palate using 3-dimensional workflow and clear aligners

INTRODUCTION

Nasoalveolar molding (NAM) was introduced over 20 years ago as adjunctive therapy for the correction of cleft lip and palate. In the current study, we propose a new approach using a digital workflow and 3-dimensional printing to fabricate clear aligner NAM devices.

METHODS

A polyvinyl siloxane (PVS) impression of an infant with a unilateral complete cleft lip and palate (UCLP) is acquired and poured, and the stone model is scanned with an intraoral scanner. The stereolithography file is digitized, and the alveolar segments are digitally segmented and moved to the desired final position. The total distance moved is divided into a sequence of 1-1.5 mm increments, creating a series of digital models. The models are 3-dimensionally printed along with button templates to allow free form positioning of the button on each model. A Vacuform machine (Taglus, Mumbai, India) was used to fabricate a 0.040-in aligner for each stage.

RESULTS

We present 1 case that was treated successfully with this approach. Appointments for the NAM adjustments were primarily to monitor progress and counseling with less time spent adjusting the appliance. The appointment length was reduced by over 30 minutes. Benefits of the aligner are improved fit, more precise increments of activation, reduced chairside time, and potentially minimized number of visits.

CONCLUSIONS

NAM custom aligners may provide similar benefits to the traditional approach while reducing the burden of care by reducing the number of visits and appointment duration. Further studies with a sample and longitudinal observations are needed to investigate the benefits of the proposed digital approach.

What Is the Burden of Care of Nasoalveolar Molding?

OBJECTIVE

This systematic review aims to evaluate nasoalveolar molding (NAM) in the context of burden of care defined as physical, psychosocial, or financial burden on caregivers.

SEARCH METHODS

Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, 5 databases were searched from inception through December 24, 2019, for keywords and subject headings pertaining to cleft lip and/or palate and NAM.

ELIGIBILITY CRITERIA

Clinical studies on NAM with reference to physical (access to care, number of visits, distance traveled), psychosocial (caregiver perceptions, family interactions, breast milk feeding), and financial (direct and indirect costs) burden were included.

DATA COLLECTION AND ANALYSIS

Study selection was performed by 2 independent reviewers.

RESULTS

The search identified 1107 articles and 114 articles remained for qualitative synthesis. Burden of care domains were discussed but not measured in 43% of articles and only 25% assessed burden of care through a primary outcome. Of these, 20 articles reported on physical, 8 articles on psychosocial, and 12 articles on financial burden. Quality of evidence is limited by study design and risk of bias.

CONCLUSION

Nasoalveolar molding has been indiscriminately associated with burden of care in the literature. Although NAM may not be the ideal treatment option for all patients and families, the physical considerations are limited when accounting for the observed psychosocial advantages. Financial burden appears to be offset, but further research is required. Teams should directly assess the impact of this early intervention on the well-being of caregivers and advance strategies that improve access to care.

Simultaneous, radiation-free registration of the dentoalveolar position and the face by combining 3D photography with a portable scanner and impression-taking

Objectives

Simultaneous, radiation-free registration of the teeth and the upper and lower jaw positions in relation to the extraoral soft tissue could improve treatment planning and documentation. The purpose of this study is to describe a workflow to solve this form of registration and surface acquisition with a mobile device.

Methods

Facial scans of ten healthy participants were taken using a blue-light LED 3D scanner (Artec® Space Spider; Artec® Group; Luxembourg). An impression of the maxillary dentoalveolar arch was taken simultaneously to the 3D photo using a modified impression tray with two different extraoral registration geometries (sphere vs. cross). Following, an impression of the mandibular dentoalveolar arch was taken once. Both impressions were scanned with the 3D scanner. All resulting standard tesselation language (.stl) files of the geometries were compared to the original, virtual .stl files and the root mean square errors (RMSE) were calculated for each surface (Artec Studio 13 Professional × 64; Artec® Group; Luxembourg) to determine which geometry serves as a better reference for intra-extraoral registration.

Results

The RMSE between the original geometries and the scanned counterfeits were statistically lower for spherical geometries (p < 0.008). Once scanned and aligned, both geometries enabled an alignment of the intra- and extraoral scan. However, the spherical geometries showed virtually better results without significance (p = 0.70).

Conclusions

The presented study provides a radiation-free solution for simultaneous dentoalveolar correlations in relation to the extraoral soft tissue. Spherical geometries achieved more precise and easier intra-extraoral alignments using the applied mobile 3D scanner and workflow.

A Virtual Noninvasive Way of Constructing a Nasoalveolar Molding Plate for Cleft Babies, Using Intraoral Scanners, CAD, and Prosthetic Milling

Presurgical nasoalveolar molding (PNAM) is a key step in the early management of cleft babies. It involves making an impression of the alveolar segments and the lip elements, after which an appliance is fabricated and activated to achieve optimal alveolar and nasal positions for a superior surgical result. These appliances are fabricated and activated in babies as young as 10 days, and the molding is ideally carried on till the baby is ready for the primary lip repair. This article outlines in detail a digital method of fabricating the PNAM appliance using a combination of intraoral scans, computer-assisted digital software, and computer-assisted machining, facilitated by milling machines. This process obviates impression making and the subsequent laboratory procedures.

RapidNAM: Algorithm for the Semi-Automated Generation of Nasoalveolar Molding Device Designs for the Presurgical Treatment of Bilateral Cleft Lip and Palate

OBJECTIVE

Nasoalveolar molding (NAM) is an accepted presurgical treatment modality for newborns with cleft lip and palate (CLP). However, the therapy is time-consuming and requires high expertise. To facilitate the treatment, we reveal an algorithm for the automated generation of patient individual NAM devices for neonates with bilateral cleft lip and palate (BCLP) and present results of software validation.

METHODS

The algorithm was implemented utilizing Python 2.7 and Blender 2.78a based on 17 digitized (3D-scanning) impressions of maxillae with BCLP. The algorithm segments alveolar structures, bridges clefts, and generates a series of NAM device designs, destined for 3D-printing for subsequent treatment. The datasets were used for first software tests. For validation, a follow-up study was carried out using six new, independent maxilla models. The generated NAM plate designs were examined regarding their potential clinical usability. Furthermore, a deviation analysis was carried out, which measured the plate models' and upper jaw models' surface deviations.

RESULTS

Series of NAM devices were generated automatically in 21 out of 23 cases. We calculated an average surface deviation of 0.140 mm (SD: 0.016 mm). Four out of six plate series (follow-up trials) were assessed as probably usable with minor adjustments.

CONCLUSION

The algorithm generates 3D-printable series of NAM device designs reliably. We expect most of the series to be clinically usable and that the first plates of each series will fit the patients' maxillae.

SIGNIFICANCE

The proposed algorithm has the potential to reduce the therapist's manual work and therefore time effort/costs related to NAM.

A semi-automated virtual workflow solution for the design and production of intraoral molding plates using additive manufacturing: the first clinical results of a pilot-study

Computer-aided design and computer-aided manufacturing (CAD/CAM) technology has been implemented in the treatment of cleft lip and palates (CLP) by several research groups. This pilot study presents a technique that combines intraoral molding with a semi-automated plate generation and 3D-printing. The clinical results of two intraoral molding approaches are compared. This is the first clinical investigation of semi-automated intraoral molding. Our study included newborns with unilateral CLP. Plaster models were digitalized and measured by two independent observers. Two methods of CAD/CAM-assisted intraoral molding were compared: (i) stepwise manual design of molding plates (conventional CAD/CAM-intraoral molding) and (ii) a semi-automated approach with an automated detection of alveolar ridges (called RapidNAM) assisted by a graphical user interface (GUI). Both approaches significantly narrowed the clefts and resulted in a harmonic alveolar crest alignment. The GUI was easy to use and generated intraoral molding devices within minutes. The presented design solution is an efficient technical refinement with good clinical results. The semi-automated plate generation with a feasible GUI is fast but allows individual adaptations. This promising technique might facilitate and foster the more widespread use of CAD/CAM-technology in intraoral molding therapy.